GE.13 - 
  Agreement  
  Concerning the Adoption of Uniform Technical Prescriptions for 
Wheeled Vehicles, Equipment and Parts which can be Fitted and/or 
be Used on Wheeled Vehic les and the Conditions for Reciprocal 
Recognition of Approvals Granted on the Basis of these 
Prescriptions * 
(Revision 2, including the amendments which entered into force on 16 October 1995)  
_________  
  Addendum 114:  Regulation No. 115 
  Revision 1 
Incorp orating all valid text up to:  
Supplement 1 to the original version of the Regulation - Date of entry into force: 9  November 2005  
Supplement 2 to the original version of the Regulation - Date of entry into force: 18 January 2006  
Corrigendum 1 to Supplement 1 to the original version of the Regulation - Date of entry into force: 
16 November 2005  
Corrigendum 1 to the original version of the Regulation - Date of entry into force: 21 June 2006  
Erratum to Supplement 2 to the original version of the Regulation  
Supp lement 3 to the original version of the Regulation - Date of entry into force: 11 July 2008  
Supplement 4 to the original version of the Regulation - Date of entry into force: 19 August 2010  
Corrigendum 1 to Supplement 4 to the original version of the Regul ation - Date of entry into force: 22 June 2011  
Supplement 5 to the original version of the Regulation - Date of entry into force: 15 July 2013  
  Uniform provisions concerning the approval of:  
  I. Specific LPG (liquefied petroleum gases) retrofit systems t o be 
installed in motor vehicles for the use of LPG in their propulsion 
system  
  II. Specific CNG (compressed natural gas) retrofit systems to be 
installed in motor vehicles for the use of CNG in their propulsion 
system  
_________  
UNITED NATIONS  
  
 * Former title o f the Agreement: Agreement Concerning the Adoption of Uniform Conditions of 
Approval and Reciprocal Recognition of  Approval for Motor Vehicle Equipment and Parts, done at 
Geneva on 20  March  1958.   E/ECE/324/Rev.2/Add.114/Rev.1− E/ECE/TRANS/505/Rev.2/Add.114/Rev.1  
   
 
 
 
21 August 2013  
 
 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
3 Regulati on No. 115  
  Uniform provisions concerning the approval of:  
  I. Specific LPG (liquefied petroleum gases) retrofit 
systems to be installed in motor vehicles for the use of 
LPG in their propulsion system  
  II. Specific CNG (compressed natural gas) retrofit systems 
to be installed in motor vehicles for the use of CNG in 
their propulsion system  
Contents  
 Page  
Regulation  
1. Scope  ................................ ................................ ................................ ................................ ................   5 
2. Definitions  ................................ ................................ ................................ ................................ ........   5 
3. Application for approval  ................................ ................................ ................................ ...................   8 
4. Markings  ................................ ................................ ................................ ................................ ...........   9 
5. Approval  ................................ ................................ ................................ ................................ ...........   9 
6. Specifications regarding the retrofit systems  ................................ ................................ ....................   10 
7. Instruction manuals  ................................ ................................ ................................ ...........................   25 
8. Modification and extension of approval of a retrofit system type  ................................ ....................   28 
9. Conformity of production  ................................ ................................ ................................ .................   29 
10. Penalties for non -conformity of production  ................................ ................................ ......................   29 
11. Production definitively discontinued  ................................ ................................ ................................   29 
12. Names and addre sses of Technical Services responsible for con ducting approval tests, and of  
Type Approval Authorities  ................................ ................................ ................................ ...............   29 
Annex es 
1A Communication  concerning the approval o r extension or refusal or withdrawal of approval or  
production definitively discontinued of a type of LPG retrofit equipment pursuant to  
Regulation No. 115  ................................ ................................ ................................ ...........................   30 
Addendum to the communication concerning a type of LPG retrofit equipment pursuant to  
Regulation No. 115  ................................ ................................ ................................ ...........................   33 
1B Communication concerning the approval or extension or refusal or withdrawal  of approval or  
production definitively discontinued of a type of CNG retrofit equipment pursuant to  
Regulation No. 115  ................................ ................................ ................................ ...........................   34 
Addendum to the communication concerning a type of CNG retrofit eq uipment pursuant to  
Regulation No. 115  ................................ ................................ ................................ ...........................   36 
2A 37Arrangement of the LPG retrofit system type approval mark  ................................ .......................   37 
2B Arrangement of the CNG retrofit system type approval mark  ................................ ..........................   38 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
4 3A Complete list of information for the purpose of the LPG retrofit system installed on vehicle  
type approval ................................ ................................ ................................ ................................ .....  39 
3B Complete list of information for the purpose of the CNG retrofit system installed on vehicle  
type approval ................................ ................................ ................................ ................................ .....  44 
4 Description of the leakage test procedures for CNG/LPG systems installed on vehicles  .................   48 
5 Presc riptions concerning the fixation of LPG and CNG container(s)  ................................ ...............   49 
6A Bi-fuel vehicles with petrol direct injection engines - Calculation of LPG energy ratio  ..................   51 
6B Bi-fuel vehicles with petrol direct injection engines - Calculation of CNG energy ratio  .................   52 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
5 1.  Scope  
  This Regulation applies to:  
1.1. Part I:  Specific LPG retrofit systems to be installed in motor vehicles for 
the use of LPG in the propulsion system.  
 Part II:  Specific CNG retrofit systems to be installed in motor vehicles for 
the use of CNG in the propulsion system.  
1.2. This Regulation applies when the retrofit systems manufacturer keep the 
initial characteristics of the whole system, for the specific vehicle family for 
which the approval has been granted.  
1.3. This Regulation does not apply to the procedures, checks an d inspections 
aimed at verifying the correct installation of the retrofit systems on vehicles, 
since this matter relies on the competence of the Contracting Party where the 
vehicle is registered.  
1.4. This Regulation applies to retrofit systems intended to  be fitted on vehicles of 
categories M and N1, with the exception of:  
(a) Vehicles type -approved pursuant to Regulation No. 83, series of 
amendments 00 or 01 or 02 or 03 or 04 series,  
(b) Vehicles type -approved pursuant to Regulation No. 49, series of 
amen dments 00 or 01 or 02 or 03 series,  
(c) Vehicles type -approved pursuant to EC Directive 70/220/EEC up to 
and including the amending Directive 96/69/EC,  
(d) Vehicles type -approved pursuant to EC Directive 88/77/EEC up to 
and including the amending Directive  96/1/EC.  
1.5. The requirements for the different categories (M 1, N 1 or others) are defined in 
paragraphs 2. to 7.2. 
 Once the retrofit system is installed in the vehicle, the modified vehicle shall 
fulfil  all the provisions of the Regulation for which the  type approval has 
been initially granted.  
  2.  Definitions  
2.1. "Approval of an LPG or CNG retrofit system " means the approval of the type 
of retrofit system to be installed in motor vehicles for the use of LPG or 
CNG.  
  
 1 As defined in the Consolidated Resolution on the Construc tion of Vehicles (R.E.3.), document 
ECE/TRANS/WP.29/78/Rev.2, para. 2. - 
www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29resolutions.html   
 2 Regarding safety requi rements, it is recommended that the minimum requirements of Regulation 
No. 67, 01 series of amendments and Regulation No.  110 shall apply to all retrofitted vehicles.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
6 2.1.1.  Specific LPG retrofit system  of an approved type may consist of several 
components as classified and approved according to Regulation No. 67, 01 
series of amendments, Part I and the specific vehicle instruction manual.  
2.1.2.  Specific CNG retrofit system of an approved type may consi st of several 
components as classified and approved according to Regulation No. 110, 
Part I and the specific vehicle instruction manual.  
2.1.3.  "A vehicle is considered mono -fuel", when, after the retrofit operation, it is 
designed primarily for permanent running on LPG or CNG, but may still 
have a petrol system for emergency purposes, where the capacity of the petrol 
tank does not exceed 15 litres.  
2.1.4.  "A vehicle is considered bi -fuel", when after the retrofit operation, it is 
equipped with a gas storag e and a separate petrol storage with a capacity 
exceeding 15 litres, and is designed to run on only one fuel at a time. The 
simultaneous use of both fuels is limited in amount or duration.  
2.1.5.  "Master -slave system " means a retrofit system in which the L PG Electronic 
Control Unit  (ECU) or CNG ECU is able to translate the petrol ECU control 
strategy in LPG or CNG operation.  
2.1.6.  "Original vehicle " means a vehicle before the installation of the retrofit 
system.  
2.2. "Specific LPG or CNG retrofit system of  an approved type " means systems, 
which do not differ in such respect as:  
2.2.1.  Retrofit system manufacturer (responsible for retrofit approval application);  
2.2.2.  Pressure regulator/vaporiser type by the same manufacturer;  
2.2.3.  Gas fuelling system typ e by the same manufacturer (i.e. induction mixer, 
injector device, vapour or liquid, single or multi -point injection system);  
2.2.4.  Sensors and actuators set types;  
2.2.5.  The fuel container type (i.e.  LPG  liquid take off / vapour pressure,  LPG  
vapour tak e off,  LPG  liquid  take off / pressurized by pump , pressurized CNG 
take off), the safety devices  and fuel container accessories, as required by 
Regulation No. 67, 01 series of amendments, or Regulation No.  110, where  
applicable (i.e. relief valve);  
2.2.6.  Fuel container fitting devices;  
Note:  With respect to paragraphs 2.2.4., 2.2.5. and 2.2.6.  above , the 
manufacturer of the retrofit can insert in his installation manual other 
components, included in the approval, as interchangeable items (see para.  7.). 
2.2.7. ECU type by the same manufacturer;  
2.2.8.  Basic software principles and control strategy;  
2.2.9.  Installation manual (see para. 7 .); 
2.2.10.  End-user manual (see para. 7 .). 
2.3. "System manufacturer " means an organization which can assume technical 
responsibility for the manufacturing of LPG and CNG retrofit systems and 
can demonstrate that it possesses the features required and the necessary 
means to achieve quality assessment and conformity of production of the 
retrofit system.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
7 2.4. "Installer " means  an organization which can assume technical responsibility 
for the correct and safe installation of the approved LPG and CNG retrofit 
system, in conformity with respectively paragraphs 6.1.1.3. and 6.2.1.3. of 
this Regulation3. 
2.5. For the purposes of thi s Regulation, "the parent vehicle ", with regard both to 
LPG system and to CNG system, means a vehicle that is selected to act as the 
vehicle, on which the requirements of this Regulation are going to be 
demonstrated, and to which the members of a family re fer. 
2.5.1.  According to this Regulation, "a member of the family " is a vehicle sharing 
the following essential characteristics with its parent vehicle:  
The family definition is based on the original vehicle characteristics.  
2.5.1.1.  (a) It is produced by the same vehicle manufacturer.  
(b) It is classified in the same category M 1 or M 2 or M 3 or N 1 or N 2 or N 3.  
Vehicles of category M 1 and N 1 class  I may belong to the same 
family.  
(c) It is subject to the same emission limits or those specified in earlier 
series of amendments of the applicable Regulation.  
(d) If the gas fuelling system has a central metering for the whole engine: 
it has an  approved power output between 0.7 and 1.15 times that of 
the engine of the parent vehicle.  If the gas fuelling system as  an 
individual metering per cylinder: it has an  approved power output per 
cylinder between 0.7 and 1.15 times that of the engine of the parent 
vehicle.  
(e) Fuel feed and combustion process (injection:  direct or indirect, 
single -point or multi -point).  
(f) It has the same pollution control system:  
(i) Same type of catalyst if fitted (three -way, oxidation, DeNO x) 
(ii) Air injection (with or without)  
(iii) Exhaust gas recirculation (EGR) (with or without)  
 If the tested vehicle was not equipped with air -injec tion or EGR, engines 
with these devices are allowed.  
2.5.1.2.  With regard to the requirement of paragraph 2.5.1.1.(a), the vehicle family 
can also cover vehicles produced by other vehicle manufacturers if it can be 
demonstrated to the Type Approval Authori ty that the same engine type and 
emission strategy is used.  
  
 3 In the bounds of the legislative power of the Contracting Party, as stated in paragrap h 1.3. of this 
Regulation, in order to ensure a proper qualification of the installer, it is recommended to require 
valid certificates, issued by the system manufacturer and/or by skilled organizations, attesting th e 
personnel' s necessary expertise and the  workshop 's suitabili ty to carry out retrofit system' s 
installation . E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
8 2.5.1.3.  With regard to requirement  of paragraph 2.5.1.1.(d):  
(a) In the case of a central metering for the whole vehicle where a demonstration 
shows that two gas fuelled vehicles could be members  of the same family 
with the exception of their approved power output, respectively P1 and P2 
(P1 < P2), and both are tested as if they were parent vehicles, the family 
relation will be considered valid for any vehicle with an approved power 
output between  0.7*P1 and 1.15*P2;  
(b) In the case of an individual metering per cylinder where a 
demonstration shows two gas fuelled vehicles could be members of 
the same family with the exception of their approved power output, 
respectively P1 and P2 (P1 < P2), and bo th are tested as if they were 
parent vehicles, the family relation will be considered valid for any 
vehicle with an approved power output between  0.7*P1 and 1.15*P2.  
2.5.1.4.  With regard to the requirement of paragraph 2.5.1.1.(f) in case of a "master -
slave" system, as defined in paragraph  2.1.6., the family relation will be 
considered valid regardless of the presence of the air injection or the EGR.  
2.6. For definitions of the components of LPG retrofit systems refer to 
Regulation  No. 67, 01 series of amen dments.  
2.7. For definitions of the components of CNG retrofit systems refer to 
Regulation  No. 110. 
  3.  Application for approval  
3.1. The application for approval of a specific retrofit system shall be submitted 
by the manufacturer or by his duly accredi ted representative.  
3.2. It shall be accompanied by the under -mentioned documents in triplicate and 
by the following details:  
3.2.1.  Description of the retrofit system comprising all the relevant details, included 
the approval numbers of each component ref erred to in Annex 3A to this 
Regulation for LPG system and Annex 3B to this Regulation for CNG 
system;  
3.2.2.  Description of the parent vehicle(s) on which the requirements of this 
Regulation are going to be tested;  
3.2.3.  Description of all modifications applied to the original parent vehicle, only in 
case of bi -fuel configuration;  
3.2.4.  Verification of compliance with the specifications prescribed in paragraph 6 . 
of this Regulation;  
3.2.5.  If needed for the purpose of paragraph 5 .2. below , notice of appr oval of the 
retrofit system for a parent vehicle which is different from those the approval 
is applied for, certifying that the retrofit system has been approved as a 
"master -slave " system, as defined in paragraph 2.1.5.  above.  
3.3. Installation manual(s) for the retrofit system installation on the parent 
vehicle(s).  
3.4. End-user manual.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
9 3.5 A sample of the specific retrofit system, properly installed in the parent 
vehicle(s).  
  4.  Markings  
4.1. The sample(s) of a specific retrofit system submitted to typ e approval shall be 
accompanied by a plate with the trade name or mark of the retrofit 
manufacturer and the type, as indicated in Annexes 2A and 2B.  
4.2. All retrofit systems, installed in the vehicle belonging to the family, as 
defined in paragraph 2.  of this Regulation , shall be identified by a plate, in 
which the approval number, and the technical specifications, as required in 
Annexes 2A and 2B shall be placed.  This plate has to be permanently fixed 
to the structure of the vehicle and shall be clearly readable and indelible.  
  5.  Approval  
5.1. If the retrofit system sample submitted for approval meets the requirements 
of paragraph 6. of this Regulation, the type approval of the retrofit system 
shall be  granted.  
5.2. Retrofit systems, which have already  been approved as "master -slave " 
systems on at least one parent vehicle, do not need to comply with 
paragraph  6.1.4.4.2.1. or  6.2.4.4.2.1. of this Regulation.  
5.3. An approval number shall be assigned to each type of the retrofit system 
approved.  Its firs t two digits (at present 00 according to the Regulation in its 
original form) shall indicate the series of amendments incorporating the most 
recent major technical amendments made to the Regulation at the time of 
issue of the approval.  The same Contractin g Party shall not assign the same 
type approval number to another type of retrofit system.  
5.4. Notice of approval or of refusal or of extension of approval of a retrofit 
system type/part pursuant to this Regulation shall be communicated to the 
Parties to the Agreement applying this Regulation, by means of a form 
conforming to the model in Annexes 1A and 1B to this Regulation.  
5.5. An international approval mark shall be affixed in the plate as indicated in 
Annexes  2A and 2B, to all retrofit systems, confor ming to a type approved 
under this Regulation, in addition to the mark prescribed in this 
paragraph  4.1.  This approval mark shall consist of:  
5.5.1.  A circle surrounding the letter "E" followed by the distinguishing number of 
the country which has granted  the approval4; 
5.5.2.  The number of this Regulation, followed by the letter "R", a dash and the 
approval number to the right of the circle defined in paragraph 5.5.1.  above.   
The approval number consists of the retrofit system type approval number, 
which appears in the communication form for this type (see paragraph  5.2.  
  
 4 The distinguishing numbers of the Contracting Parties to the 1958 Agreement are reproduced in Annex 
3 to the Consolidated Resolution on the Construction of Vehicles (R.E.3), document 
ECE/TRANS/WP.29/78/Rev.2/Amend.3 - 
www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29resolutions.html  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
10 above and Annexes 1A and 1B) preceded by two figures indicating the latest 
series of amendments to this Regulation.  
5.6. The approval mark shall be clearly readable and be indelible.  
5.7. Annexes 2A and 2B to this Regulation give examples of the arrangement of 
the aforesaid plate with approval mark.  
  6.  Specifications regarding the retrofit systems  
6.1. Part I - LPG retrofit system specifications:  
6.1.1.  Requirements for the installatio n of specific equipment for the use of LPG in 
the propulsion system of a vehicle  
6.1.1.1.  An LPG retrofit system shall consist at least of the following components:  
6.1.1.1.1.  Components indicated in Regulation No. 67, 01 series of amendments and 
defined a s necessary ; 
6.1.1.1.2.  Installation manual ; 
6.1.1.1.3.  End-user manual.  
6.1.1.2.  The LPG retrofit system may also include components indicated as optional 
in Regulation No. 67, 01 series of amendments.  
6.1.1.3.  The LPG retrofit system installed in the veh icle, in a proper way as defined in 
the above installation manual, shall comply with the installation requirements 
of Regulation No. 67, 01 series of  amendments.  Concerning the fixation of 
the fuel container, the requirements of Regulation No. 67, 01 seri es of 
amendments shall be deemed to be met if the requirements of Annex 5 to the 
present Regulation are satisfied.  
6.1.2.  Pollutants emissions and CO 2 emissions (for categor ies M1 and N 1 vehicles 
only)  
6.1.2.1.  One LPG retrofit system sample, as described  in paragraph 2.2. of this 
Regulation, installed into the parent vehicle(s), as described in paragraph  2.5. 
of this Regulation, shall be submitted to the test procedures described in 
Regulations No.  835 and No.  101, or No.  496, where applicable, in the lim its 
of the requirements of paragraphs 6.1.2.4 . and 6.1.2.5 . below. The vehicles 
and/or the engines are also submitted to a maximum power comparison test, 
as described in Regulation No.  85 for engines, or defined in paragraph 6.1.3. 
below for vehicles.  
6.1.2.2. Fuel requirements by the engine: the type of fuel no rmally used by the engine 
could be: 
(a) LPG  only (LPG model) in case of  mono -fuel5; 
(b) Either  unleaded petrol (petrol mode)  or LPG (LPG mode) in 
case of  bi-fuel; 
  
 5 According to Regulation No. 83, the series of amendments in fo rce during the initial type approval 
of the engine.   
 6 According to Regulation No. 49, the series of amendments in force during the initial type approval 
of the engine.   E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
11 (c) Both die sel fuel or diesel fuel and LPG  (dual fuel) . 
(Provisions for dual fuel have still to be defined).  
6.1.2.3.  "Pollutants " means:  
(a) Carbon monoxide  
(b) Hydrocarbons assuming a ratio:  
 CH 1,85 for petrol,  
 CH 1,86 for diesel fuel,  
 CH 2,52 for LPG,  
 CH (to be defined)  for dual fuel;  
(c) Oxides of nitrogen, the latter being expressed in nitrogen dioxide 
(NO 2) equivalent.  
(d) Particulates, etc.  
6.1.2.4.  Exhaust emissions and CO 2 emissions (M 1 and N 1 categor ies of vehicles):  
6.1.2.4.1.  Specific requirements on the Type I test (verifying t he average exhaust 
emissions after a cold start):  
6.1.2.4.1.1.  Measurements of tailpipe emissions shall be performed after a cold start with 
each fuel:  
(a) Reference petrol,  
(b) Reference LPG A,  
(c) Reference LPG B.  
 The emissions of CO, HC , and NO x are ca lculated according Regulation 
No. 835. 
6.1.2.4.1.2.  Setting of the dynamometer  
 With the agreement of the Type Approval Authority , one of the following 
methods may be used:  
6.1.2.4.1.2.1.  Using of coast -down factors/coefficients of the original vehicle:  
 In case coast -down coefficients of the original vehicle used during the type 
approval are used, the following conditions shall apply:  
(a) The parent vehicle mass shall be measured with the retrofit system 
installed on the vehicle including the LPG tank full y filled up or shall 
be calculated as the sum of the original vehicle reference mass and the 
mass of the retrofit system with the LPG tank fully filled up;  
(b) The inertia mass of the parent vehicle shall be determined according 
to the mass of the retrofit ted vehicle;  
(c) The rolling resistance of the parent vehicle shall correspond to the 
original vehicle value proportionally adjusted to the parent vehicle 
mass measured or calculated as above:  
 F0'  =  f0 + (abs(f0))*(p/m)  
 Where:  
 F'0  =  rolling resistan ce of the parent vehicle  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
12  f0  =  rolling resistance of the original vehicle  
 m  = reference mass of the original vehicle  
 p  =  retrofit system mass;  
(d) The other coefficients of the resistance of the parent vehicle shall be 
equal to that of the original vehicle.  
6.1.2.4.1.2.2.  Using of the table values:  
(a) The parent vehicle mass shall be measured with the retrofit system 
installed on the vehicle including the LPG tank fully filled up or shall 
be calculated as the sum of the original vehicle reference ma ss and the 
mass of the retrofit system with the LPG tank fully filled up;  
(b) The inertia mass of the parent vehicle shall be determined according 
to the mass of the retrofitted vehicle;  
(c) The coefficient a shall be the one corresponding to the reference  mass 
of the retrofitted vehicle;  
(d) The coefficient b shall be the one corresponding to the reference mass 
of the original vehicle.  
6.1.2. 4.1.3. Exhaust emissions test in petrol mode   
Subject to the requirements of paragraph 6.1.2.4.1.5.  below , the tests  shall be 
repeated three times using reference petrol. The parent vehicle(s), equipped 
with the retrofit system, shall comply with the limit values according to the 
type approval of the original vehicle(s) including the deterioration factors 
applied during  the type approval of the original vehicle(s).  
6.1.2.4 .1.4. Notwithstanding the requirements of paragraph 6.1.2.4.1.3.  above , for each 
pollutant or combination of pollutants, one of the three test results may 
exceed, by not more than 10 per cent, the limit  prescribed, provided that the 
arithmetical mean of the three results is below the prescribed limit. Where the 
prescribed limits are exceeded for more than one pollutant, it is immaterial 
whether this occurs in the same test or in different tests.  
6.1.2. 4.1.5. The number of emission tests prescribed in paragraph 6.1.2.4.1.3.  may be 
reduced under the following conditions:  
(a) One test is required if the result obtained for each pollutant subject to 
limitation is less than or equal to 0.7 the emission limit  
(i.e. V1  0.70 G);  
(b) Two tests are required if, for each pollutant subject to limitation the 
following requirements are met:  
 V1  0.85 G and V1 + V2  1.70 G  and  V2  G 
 Where : 
 V1 value of the emission of one pollutant obtained from the first 
test of the Type I performed;  
 V2 value of the emission of one pollutant obtained from the second 
test of the Type I performed;  
 G limit value of the emissions of one pollutant (CO/HC/NO x) 
according to the type approval of the vehicle(s) divided by the 
deterio ration factors.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
13 6.1.2.4.1.6 . Exhaust emissions test in LPG mode  
Subject to the requirements of paragraph 6.1.2.4.1.8.  below , the tests shall be 
repeated three times with each reference LPG.  The parent vehicle, equipped 
with the retrofit system, shall comp ly with the limit  values according to the 
type approval of the original vehicle(s) including the deterioration factors 
applied during the type approval of the original vehicle(s).  
 If the parent vehicle complies with Regulation No. 83, 05 series of 
amendme nts, or with Directive 98/69/EC, or with Regulation No. 49, 
04 series of amendments, or with Directive 1999/96/EC, the vehicle shall not 
use petrol for more than a maximum of 90 seconds during each test.  
 For vehicles complying  with later series of amendme nts to Regulations 
Nos. 83 and 49, or later amending Directives or European Regulations, this 
period shall not exceed 60 seconds.  
6.1.2.4.1.6.1.  Engine starting -up 
It is permissible that the engine is started on petrol and switched to LPG after 
a predeterm ined period of time which cannot be changed by the driver.  
6.1.2.4.1.6.2.  Use of petrol  
If the parent vehicle complies with Regulation No. 83, 05 series of 
amendments, or with Directive 98/69/EC, or with Regulation No. 49, 
04 series of amendments, or with Directive 1999/96/EC, the vehicle shall not 
use petrol for more than a maximum of 90 seconds during each test.  
For vehicles complying with later series of amendments to Regulations 
Nos. 83 and 49, or later amending Directives or European Regulations, this  
period shall not exceed 60 seconds.  
6.1.2.4.1.6.3.  Special provisions for petrol direct injection engines  
Notwithstanding the paragraph 6.1.2.4.1.6.2 . above , in case of vehicles with 
petrol direct injection engines , it is permissible to use petrol only or  
simultaneously with LPG during the entire test cycle provided that the energy 
consumption of gas is higher than 80  per cent  of the total amount of energy 
consumed during the test.  
This percentage shall be calculated in accordance with the method set out i n 
Annex 6A.  
6.1.2.4.1.7.  Notwithstanding the requirements of paragraph 6.1.2.4.1.6.  above , for each 
pollutant or combination of pollutants, one of the three test results may 
exceed, by not more than 10 per cent, the limit prescribed, provided  that the 
arithmetical mean of the three results is below the prescribed limit. In this 
case the prescribed limits may be exceeded for more than one pollutant in the 
same test or in different tests.  
6.1.2.4.1.8.  The number of emission tests prescribed in paragraph 6.1.2 .4.1.6.  above  on 
each LPG reference fuel may be reduced  under the following conditions:  
(a) One test is required if the result obtained for each pollutant or for the 
combined emission of two pollutants subject to limitation is less than 
or equal to 0.7 the  emission limit (i.e. M 1  0.70 G);  
(b) Two tests are required if, for each pollutant or for the combined 
emission of two pollutants subject to limitation the following 
requirements are met:  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
14  M1  0.85 G and M 1 + M 2  1.70 G  and  M 2  G 
 Where : 
 M1 value  of the emission of one pollutant obtained from the first 
test of the Type I performed;  
 M2 value of the emission of one pollutant obtained from the second 
test of the Type I performed;  
 G limit value of the emissions of one pollutant (CO/HC/NO x) or 
the su m of two pollutants (HC + NO x) according to the type 
approval of the vehicle(s) divided by the deterioration factors.  
6.1.2.4 .2. Specific requirements on the Type II test (carbon monoxide emission test at 
idling speed) for vehicles having a maximum mass ex ceeding 3,500 kg:  
6.1.2.4 .2.1. One LPG retrofit system sample, as described in paragraph 2.2. of this 
Regulation, installed into the parent vehicle, as described in paragraph 2.5. of 
this Regulation, shall be submitted to the Type II test procedures descri bed in 
Regulation No.  835. 
6.1.2.4.2.2.  Notwithstanding the provisions of Regulation No. 835, the Type II test shall 
be performed at the request of the system manufacturer with only one LPG 
reference fuel chosen at the discretion of the Technical Service r esponsible 
for the test.  
6.1.2.4 .3. The LPG retrofit system, as described in paragraph 2.2. of this Regulation, 
installed into the parent vehicle(s), shall comply with the requirements and 
tests of Regulation No. 835 on both petrol and LPG modes.  
6.1.2.4.3 .1. The emissions of CO 2 are calculated according to Regulation No.  101 for 
each parent vehicle, if applicable.  
 The mean of CO 2 emissions shall be calculated as follows:  
 
 
 
 
Where : 
i number  of parent vehicles (i = 1 to n)  
CO 2Ai mean value of the emissions of CO 2 obtained from the three 
Type  I tests with the retrofit system and with LPG A for 
vehicle No.  i, 
CO 2Bi mean value of the emissions of CO 2 obtained from the three 
Type  I tests with the  retrofit system and with LPG B for 
vehicle No.  i; 
CO 2petrol.i  mean value of the emissions of CO 2 obtained from the three 
Type  I tests with reference petrol for vehicle No.  i. 
6.1.2. 4.3.2. The mean fuel consumption shall be calculated in the same way as fo r the 
mean of CO 2 emissions, as defined in paragraph 6.1.2.4.3.1.  
CO2LPG=1/n (CO2Ai+CO2Bii=1n
)/2  
CO2LPG=1/n (CO2Ai+CO2Bii=1n
)/2 
COpetroln COpetrol iin
2121
/.E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
15 6.1.2. 4.3.3. The ratios of CO 2 emissions and fuel consumption shall be calculated as 
follows:  
KCO = CO 2LPG / CO 2petrol  
          2
 
KCons = Cons LPG / Cons petrol 
 For each vehicle of the famil y, the official values of CO 2 emissions are 
multiplied by the above ratios.  
6.1.2.5 . Exhaust emissions (M 2, M 3, N 2 and N 3 categories of vehicles)  
 This paragraph is reserved for the specific requirements for emissions of 
diesel engines approved according t o Regulation No. 49 and equipped with a 
retrofit LPG system (dual fuel) if required.  
6.1.3.  Power requirements  
 The parent vehicle(s) or engine(s) are submitted to the tests as follows:  
6.1.3.1.  One LPG retrofit system sample as described in paragraph 2.2.  of this 
Regulation, installed in the parent vehicle(s) or on the parent engine(s) shall 
be submitted to the test procedures of paragraph 6.1.3.2. or 6.1.3.3. below.  
The measured power with LPG shall be lower than that measured with p etrol 
+5 per cent.  
6.1.3.2. Chassis dynamometer method  
 The maximum power at the wheels is measured on a chassis dynamometer on 
each parent vehicle with the following fuels:  
(a) Reference petrol ; 
(b) Reference LPG A or B . 
The mean of power measurements shall be calculated as fo llows:  
 
 
 
 
 
 
 
The ratio of engine power shall be calculated as follows:  
Kpower = Power LPG / Power petrol 
For each vehicle of the family, the official values of engine power are 
multiplied by the above ratio.  
6.1.3.3.  Engine dynamometer method  
 The maximum power at the crankshaft is measured on an engine 
dynamometer according to Regulation No. 85 for each parent vehicle(s) with 
the following fuels:  
(a) Commercial petrol or diesel fuel ; 
(b) Comm ercial LPG.  
Powerpetrol1/n Powerpetrol ii=1n
 = .
PowerLPG1/n PowerLPG ii=1n
 = .E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
16 The mean of power measurements shall be calculated as follows:  
 
 
 
 
 
 
 
 
 
The ratio of engine power shall be calculated as follows:  
Kpower = Power LPG / Power petrol 
 For each vehicle of the family, the official values of engine power are 
multipl ied by the above ratio.  
6.1.4.  On-board Diagnostic System (OBD) requirements and tests for vehicles 
retrofitted with LPG retrofit system.  
6.1.4.1.  For the purposes of this paragraph, the following definitions apply:  
6.1.4.1.1.  "Original emission -related co mponent " means any component in the air inlet, 
exhaust or evaporative system which supplies an input to or receives an 
output from the petrol controller.  
6.1.4.1.2.  "LPG emission -related component " means any component in the air inlet or 
in the exhaust sys tem which supplies an input to or receives an output from 
the LPG controller.  
6.1.4.2.  In the case that there is a need, to fit properly the LPG retrofit system in the  
vehicle, it is allowed to simulate the right operation of the original emission -
related components which are not in use on LPG mode.  
6.1.4.3.  The LPG retrofit system, as described in paragraph  2.2. of this Regulation, 
installed into the parent vehicle(s), shall comply with the requirements and 
tests of Annex  11 of Regulation No.  83, 05 series  of amendments on both 
petrol and LPG modes.  
6.1.4.4.  Specific OBD requirements and tests for "master -slave " retrofit system:  
6.1.4.4.1  Notwithstanding the requirements of the paragraph 6.1.4.3.  above , a "master -
slave " retrofit system shall fulfil the foll owing requirements:  
(a) The petrol ECU shall remain activated for engine management in both 
petrol and LPG modes;  
(b) During petrol operations the petrol OBD system shall remain the only 
on-board diagnostic system of the vehicle;  
(c) During LPG operations the petrol OBD system shall continue to 
monitor original emission related components with the exception of 
those which are not in use;  
(d) During LPG operations the LPG ECU shall only monitor for the LPG 
emission -related components as well as their electri cal connections;  
Powerpetrol1/n Powerpetrol ii=1n
 = .
PowerLPG1/n PowerLPG ii=1n
 = .E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
17 6.1.4.4.2.  Notwithstanding the requirements of paragraph 6.1.4.3.  above , the LPG 
retrofit system shall be submitted to the following tests which, in the case of 
Type I tests, shall be performed according to Regulation No. 835. 
6.1.4.4.2.1.  The following tests shall be carried out on one parent vehicle, equipped with 
the LPG retrofit system:  
(a) The LPG ECU shall follow the petrol ECU on fuel strategies (e.g. 
injection).  This can be demonstrated by a monitoring (diagnostic) 
programme, while  modifying the signal of one of the petrol system's 
sensors with an impact on the injection time;  
(b) During a Type I test on petrol the original malfunction indicator (MI) 
shall activate due to the electrical disconnection of any original 
emission -related  component;  
(c) During a Type I test on LPG the original MI shall activate due to the 
electrical disconnection of any original emission -related component, 
which is in use during LPG operations.  
6.1.4.4.2.2.  The following tests shall be carried out on the p arent vehicle(s), equipped 
with the LPG retrofit system, only on LPG operating mode:  
(a) During a Type I test, electrical disconnection of one LPG emission -
related component;  
(b) During a Type I, test replacement of one LPG emission -related 
component with a deteriorated and defective one or electronic 
simulation of such a failure.  
The original MI or automatic switch from LPG mode to petrol mode shall 
activate before the end of the tests under any of the conditions above.  
6.1.4.4.2.3.  Fault codes due to malf unctions of the LPG emission -related components and 
their electrical connections shall be stored in the LPG ECU.  
6.1.4.4.2.4.  The system manufacturer shall provide specific instructions as to read out the 
LPG fault codes referred to in paragraph 6.1.4.4.2. 3. above.  
6.2. Part II - CNG retrofit system specifications  
6.2.1.  Requirements for the installation of specific equipment for the use of 
compressed natural gas (CNG) in the propulsion system of a vehicle  
6.2.1.1.  A CNG retrofit system shall consist at le ast of the following components:  
6.2.1.1.1.  Components indicated in Regulation No. 110 and defined as necessary;  
6.2.1.1.2.  Installation manual;  
6.2.1.1.3.  End-user manual.  
6.2.1.2.  The CNG retrofit system may also include components indicated as optional 
in Regulation No. 110.  
6.2.1.3.  The CNG retrofit system installed in the vehicle, in a proper way as defined 
in the above installation manual, shall comply with the installation 
requirements of Regulation No. 110.  Concerning the fixation of the fuel 
conta iner, the requirements of Regulation No. 110 shall be deemed to be met 
if the requirements of Annex 5 to the present Regulation are satisfied.  
6.2.2.  Pollutants emissions and CO 2 emissions (for categor ies M1 and N 1 vehicles 
only)  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
18 6.2.2.1.  One CNG retrofit system sample, as described in paragraph 2.2. of this 
Regulation, installed into the parent vehicle as described in paragraph 2.5. of 
this Regulation, shall be submitted to the test procedures described in 
Regulations Nos. 835 and No.  101, or No. 496, wher e applicable,  in the limits 
of the requirements of paragraphs  6.2.2.5. and 6.2.2.6.  below.  
 The vehicles and/or the engines are also submitted to a maximum power 
comparison test, as described in Regulation No. 85 for engines or defined in 
paragraph 6.2.3. below for vehicles.  
6.2.2. 2. Fuel requirements by the engine, the type of fuels normally used by the 
engine:  
(a) CNG only (CNG mode) in case of  mono -fuel5; 
(b) Either  unleaded petrol (petrol mode)  or CNG (CNG mode) in case of  
bi-fuel; 
(c) Both dies el fuel or diesel fuel and CNG  (dual fuel) . 
(Provisions for dual fuel have still to be defined).  
6.2.2.3.  "Pollutants " means:  
(a) Carbon monoxide;  
(b) Hydrocarbons assuming a ratio:  
 CH 1,85 for petrol;  
 CH 1,86 for diesel fuel;  
 CH 4 for CNG;  
 CH (to be defined) for  dual fuel;  
(c) Oxides of nitrogen, the latter being expressed in nitrogen dioxide 
(NO 2) equivalent ; 
(d) Particulates, etc.  
6.2.2.4.  Exhaust emissions (M 1 and N 1 categories of vehicles and CO 2 emissions M 1 
category vehicles):  
6.2.2. 4.1. Specific requiremen ts on the Type I test (verifying the average exhaust 
emissions after a cold start):  
6.2.2. 4.1.1. Measurements of tailpipe emissions shall be performed after a cold start with 
each fuel:  
(a) Reference petrol ; 
(b) Reference G20 fuel ; 
(c) Reference G25 fuel.  
The emissions of CO, HC, and NO x are calculated according Regulation 
No. 835. 
6.2.2.4.1.2.  Setting of the dynamometer  
 With the agreement of the type approval authority, one of the following 
methods may be used:  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
19 6.2.2.4.1.2.1.  Using of coast -down factors/c oefficients of the original vehicle:  
 In case coast -down coefficients of the original vehicle used during the type 
approval are used, the following conditions shall apply:  
(a) The parent vehicle mass shall be measured with the retrofit system 
installed on the vehicle including the CNG tank fully filled up or shall 
be calculated as the sum of the original vehicle reference mass and the 
mass of the retrofit system with the CNG tank fully filled up;  
(b) The inertia mass of the parent vehicle shall be determine d according 
to the mass of the retrofitted vehicle;  
(c) The rolling resistance of the parent vehicle shall correspond to the 
original vehicle value proportionally adjusted to the parent vehicle 
mass measured or calculated as above:  
 f0' = f0 + (abs(f0))*(p /m) 
 Where : 
 f'0  = rolling resistance of the parent vehicle  
 f0  = rolling resistance of the original vehicle  
 m  = reference mass of the original vehicle  
 p  = retrofit system mass;  
(d) The other coefficients of the resistance of the parent vehicle shal l be 
equal to that of the original vehicle.  
6.2.2.4.1.2.2.  Using of the table values:  
(a) The parent vehicle mass shall be measured with the retrofit system 
installed on the vehicle including the CNG tank fully filled up or shall 
be calculated as the sum o f the original vehicle reference mass and the 
mass of the retrofit system with the CNG tank fully filled up;  
(b) The inertia mass of the parent vehicle shall be determined according 
to the mass of the retrofitted vehicle;  
(c) The coefficient a shall be the  one corresponding to the reference mass 
of the retrofitted vehicle;  
(d) The coefficient b shall be the one corresponding to the reference mass 
of the original vehicle.  
6.2.2.4 .1.3. Exhaust emissions test in petrol mode   
Subject to the requirements of para graph 6.2.2.4.1.5.  below  the tests shall be 
repeated three times using reference petrol. The parent vehicle(s), equipped 
with the retrofit system, shall comply with the limit values according to the 
type approval of the original vehicle(s) including the de terioration factors 
applied during the type approval of the original vehicle(s).  
6.2.2. 4.1.4.  Notwithstanding the requirements of paragraph 6.2.2.4.1.3.  above , for each 
pollutant or combination of pollutants, one of the three test results may 
exceed, by no t more than 10 per cent, the limit prescribed, provided that the 
arithmetical mean of the three results is below the prescribed limit.  In this 
case the prescribed limits may be exceeded for more than one pollutant in the 
same test or in different tests.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
20 6.2.2.4.1.5.  The number of emission tests prescribed in paragraph 6.2.2.4.1.3.  above  may 
be reduced under the following conditions:  
(a) One test is required if the result obtained for each pollutant subject to 
limitation is less than or equal to 0.7 the emi ssion limit  
(i.e. V1  0.70 G ); 
(b) Two tests are required if, for each pollutant subject to limitation the 
following requirements are met:  
 V1  0.85 G and V1 + V2  1.70 G  and  V2  G 
 Where:  
 V1 value of the emission of one pollutant obtained from t he first 
test of the Type I performed;  
 V2 value of the emission of one pollutant obtained from the second 
test of the Type I performed;  
 G limit value of the emissions of one pollutant (CO/HC/NO x) 
according to the type approval of the vehicle(s) divided b y the 
deterioration factors.  
6.2.2.4.1.6  Exhaust emissions test in CNG mode  
Subject to the requirements of paragraph 6.2.2.4.1.8.  below , the tests shall be 
repeated three times with each reference CNG. The parent vehicle(s), 
equipped with the retrofit syst em, shall comply with the limit values 
according to the type approval of the original vehicle(s) including the 
deterioration factors applied during the type approval of the original 
vehicle(s).  
 If the parent vehicle(s) complies with Regulation No. 83, 05 series of 
amendments, or with Directive 98/69/EC, or with Regulation No. 49, 
04 series of amendments, or with Directive 1999/96/EC, the vehicle shall not 
use petrol for more than a maximum of 90 seconds during each test.  
 For vehicles complying with later series of amendments to Regulations 
Nos. 83 and 49, or later amending Directives or European Regulations, this 
period shall not exceed 60 seconds.  
6.2.2.4.1.6.1.  Engine starting -up 
It is permissible that the engine is started on petrol and switched to CNG after 
a predetermined period of time which cannot be changed by the driver.  
6.2.2.4.1.6.2.  Use of petrol  
If the parent vehicle complies with Regulation No. 83, 05 series of 
amendments, or with Directive 98/69/EC, or with Regulation No. 49, 
04 series of ame ndments, or with Directive 1999/96/EC, the vehicle shall not 
use petrol for more than a maximum of 90 seconds during each test.  
For vehicles complying with later series of amendments to Regulations 
Nos. 83 and 49, or later amending Directives or European Regulations, this 
period shall not exceed 60 seconds.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
21 6.2.2.4.1.6.3.  Special provisions for petrol direct injection engines  
Notwithstanding the paragraph 6.2.2.4.1.6.2 . above , in case of vehicles with 
direct injection petrol engines, it is permissible to u se petrol only or 
simultaneously with CNG during the entire test cycle provided that the 
energy consumption of gas is higher than 80  per cent  of the total amount of 
energy consumed during the test.  
This percentage shall be calculated in accordance with the  method set out in 
Annex 6B.  
6.2.2.4.1.7.  Notwithstanding the requirements of paragraph 6.2.2.4.1.6.  above , for each 
pollutant or combination of pollutants, one of the three test results may 
exceed, by not more than 10 per cent, the limit prescribed, provi ded that the 
arithmetical mean of the three results is below the prescribed limit. In this 
case the prescribed limits may be exceeded for more than one pollutant in the 
same test or in different tests.  
6.2.2.4.1.8.  The number of emission tests prescribed i n paragraph 6.2.2.4.1.6.  above  on 
each CNG reference fuel may be reduced under the following conditions:  
(a) One test is required if the result obtained for each pollutant subject to 
limitation is less than or equal to 0.7 the emission limit  
(i.e. M 1  0.70 G),  
(b) Two tests are required if, for each pollutant subject to limitation the 
following requirements are met:  
 M1  0.85 G and M 1 + M 2  1.70 G  and  M 2  G 
 Where:  
 M1 value of the emission of one pollutant obtained from the first 
test of the Type  I performed;  
 M2 value of the emission of one pollutant obtained from the second 
test of the Type I performed;  
 G limit value of the emissions of one pollutant (CO/HC/NOx) 
according to the type approval of the vehicle(s) divided by the 
deterioration factor s. 
6.2.2 .4.2. Specific requirements on the Type II test (carbon monoxide emission test at 
idling speed) for vehicles having a maximum mass exceeding 3,500 kg:  
6.2.2.4 .2.1. One CNG retrofit system sample, as described in paragraph 2.2. of this  
Regulation, i nstalled into the parent vehicle, as described in paragraph 2.5. of 
this Regulation, shall be submitted to the type II test procedures described in 
Regulation No.  835. 
6.2.2. 4.2.2. Notwithstanding the provisions  of Regulation No. 835, the Type II test shal l 
be performed at the request of the system manufacturer with only one CNG 
reference fuel chosen at the discretion of the Technical Service responsible 
for the test.  
6.2.2. 4.3. Calculation of the CO 2 emissions and fuel consumption (for M 1 and N 1 
categor ies of vehicles)  
6.2.2. 4.3.1. The emissions of CO 2 are calculated according to Regulation No. 101 for 
each parent vehicle,  if applicable.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
22  The mean of CO 2 emissions shall be calculated as follows:  
 
 
 
 
Where : 
i  number of parent vehicles (i = 1 to n)  
CO 2G20 mean value of the emissions of CO 2 obtained from the three 
Type  I tests with the retrofit system and with CNG G20 for 
vehicle No. i;  
CO 2G25 mean value of the emissions of CO 2 obtained fr om the three 
Type  I tests with the retrofit system and with CNG G25 for 
vehicle No. i;  
CO 2petrol.i  mean value of the emissions of CO 2 obtained from the three 
Type  I tests with reference petrol for vehicle No.  i. 
6.2.2. 4.3.2.  The mean fuel consumption shall  be calculated in the same way as for the 
mean of CO 2 emissions, as defined in paragraph 6.2.2.4.3.1.  above.  
6.2.2. 4.3.3. The ratios of CO 2 emissions and fuel consumption shall be calculated as 
follows:  
KCO = CO 2CNG / CO 2petrol  
          2
 
KCons = Cons CNG / Cons petrol 
 For each vehicle of the family, the official values of CO 2 emissions and fuel 
consumption are multiplied by the above ratios.  
6.2.2.5 . Exhaust emissions (M 2, M 3, N 2 and N 3 categories of vehicles)  
6.2.2.6.  This paragraph is reserved for the sp ecific requirements for emissions of 
diesel engines approved according to Regulation No. 49 and equipped with a 
retrofit CNG  system (dual fuel) if required.  
6.2.3.  Power requirements  
 The parent vehicle(s) or engine(s) are submitted to the tests as follows : 
6.2.3.1.  One CNG retrofit system sample as described in paragraph 2.2. of this 
Regulation, installed in the parent vehicle(s) or on the parent engine(s) shall 
be submitted to the test procedures of paragraph 6.2.3.2. or 6.2.3.3. below.  
The measured power  with CNG shall be lower than that measured with petrol 
+5 per cent.  
6.2.3.2.  Chassis dynamometer method  
 The maximum power at the wheels is measured on a chassis dynamometer on 
each parent vehicle with the following fuels:  
(a) Reference petrol ; 
(b) Refere nce fuel G20 or G25.  
CO2LPG=1/n (CO2Ai+CO2Bii=1n
)/2 
COpetroln COpetrol iin
2121
/.2CNG  2G20i  2G25i  2G25i  2G25i  2G25i  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
23 The mean of power measurements shall be calculated as follows:  
 
 
 
 
 
 
 
 
 
T
he ratio of engine power shall be calculated as follows:  
 Kpower = Power CNG / Power petrol  
For each vehicle of the family, the o fficial values of engine power are 
multiplied by the above ratio.  
6.2.3.3.  Engine dynamometer method  
 The maximum power at the crankshaft is measured on an engine 
dynamometer according to Regulation No. 85 for each parent vehicle(s) with 
the following fuel s: 
(a) Commercial petrol or diesel fuel ; 
(b) Commercial CNG.  
 The mean of power measurements shall be calculated as follows:  
 
 
 
 
 
 The ratio of engine power shall be calculated as follows:  
 Kpower = Power CNG / Power petrol  
 For each vehicle of the family, the official values of engine power are 
multiplied by the above ratio.  
6.2.4.  OBD requirements and tests for vehicles retrofitted with CNG retrofit 
system.  
6.2.4.1.  For the purposes of this paragraph, the f ollowing definitions apply:  
6.2.4.1.1.  "Original emission -related component " means any component in the air inlet, 
exhaust or evaporative system which supplies an input to or receives an 
output from the petrol controller;  
6.2.4.1.2.  "CNG emission -related c omponent " means any component in the air inlet or 
in the exhaust system which supplies an input to or receives an output from 
the CNG controller.  
6.2.4.2.  In the case that there is a need, to fit properly the CNG retrofit system in the 
vehicle, it is allow ed to simulate the right operation of the original emission -
related components which are not in use on CNG mode.  
Powerpetrol1/n Powerpetrol ii=1n
 = . 
PowerCNG1/n PowerCNG ii=1n
 = .
Powerpetrol1/n Powerpetrol. ii=1n

 
PowerCNG1/n PowerCNG ii=1n
 = .E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
24 6.2.4.3.  The CNG retrofit system, as described in paragraph 2.2. of this Regulation, 
installed into the parent vehicle(s), shall comply with th e requirements and 
tests of Regulation No. 835 on both petrol and CNG modes.  
6.2.4.4.  Specific OBD requirements and tests for "master -slave " retrofit system:  
6.2.4.4.1.  Notwithstanding the requirements of paragraph 6.2.4.3.  above , a "master -
slave " retrofit  system shall fulfil the following requirements:  
(a) The petrol ECU shall remain activated for engine management in both 
petrol and CNG modes ; 
(b) During petrol operations the petrol OBD system shall remain the only 
on-board diagnostic system of the vehicl e; 
(c) During CNG operations the petrol OBD system shall continue to 
monitor the original emission related components with the exception 
of those which are not in use ; 
(d) During CNG operations the CNG ECU shall only monitor for the 
CNG emission -related co mponents as well as their electrical 
connections.  
6.2.4.4.2.  Notwithstanding  the requirements of paragraph 6.2.4.3.  above , the CNG 
retrofit system shall be submitted to the following tests, which, in the case of 
Type I tests, shall be performed according t o Regulation No. 835. 
6.2.4.4.2.1.  The following tests shall be carried out on one parent vehicle, equipped with 
the CNG retrofit system:  
(a) The CNG ECU shall follow the petrol ECU on fuel strategies (e.g. 
injection and ignition strategies (e.g. spark plu g advance)).  This can 
be demonstrated by a monitoring (diagnostic) programme, while 
modifying the signal of one of the petrol system's sensors with an 
impact on the injection time and on ignition spark plug advance;  
(b) During a Type I test on petrol the original MI shall activate due to the 
electrical disconnection of any original emission -related component;  
(c) During a Type I test on CNG the original MI shall activate due to the 
electrical disconnection of any original emission -related component, 
which is in use during CNG operations.  
6.2.4.4.2.2.  The following tests shall be carried out on the parent vehicle(s), equipped 
with the CNG retrofit system, only on CNG operating mode:  
(a) During a Type I test, electrical disconnection of one CNG emission -
related component;  
(b) During a Type I, test replacement of one CNG emission -related 
component with a deteriorated and defective one or electronic 
simulation of such a failure.  
 The original MI or automatic switch from CNG mode to petrol mode shall 
activate bef ore the end of the tests under any of the conditions above.  
6.2.4.4.2.3.  Fault codes due to malfunctions of the CNG emission -related components 
and their electrical connections shall be stored in the CNG ECU.  
6.2.4.4.2.4.  The system manufacturer shall prov ide specific instructions as to read out the 
CNG fault codes referred to in paragraph 6.2.4.4.2.3.  above.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
25   7.  Instruction manuals  
  7.1.  Installation manual for the retrofit installation on the vehicle  
7.1.1.  Scope  
 The scope of this paragraph is to lis t the minimum requirements which shall 
be contained in the installation manual.  
7.1.2.  List of reference standards  
7.1.3.  General requirements : 
7.1.3.1.  The installation manual has the purpose to guide the installer through the 
correct procedures which sha ll be observed while assembling the LPG/CNG 
systems.  
7.1.3.2.  The installation manual shall be prepared by the retrofit system manufacturer.  
7.1.3.3.  The installation manual is part of the retrofit system and shall therefore be 
provided for each  conversion  kit. 
7.1.3.4.  The installation manual shall be written in the language of the country to 
which the conversion retrofit will be delivered , or at least in English.  
7.1.3.5.  The installation manual can be divided in two parts:  
Part I:  (a) Part containing the  description of the sample of the retrofit 
system;  
 (b) Part containing the list of components indicated by the 
retrofit manufacturer as alternatives.  
Part II:  Part containing installation instructions for the specific vehicle.  
7.1.3.6.  Installation manual  of the parent vehicle(s) has to be submitted to the Type 
Approval A uthority that grants the type approval.  
7.1.3.7.  Installation manual of the vehicles belonging to the family has to be filed by 
the retrofit system manufacturer for a time to be determined  in accordance 
with the Type Approval A uthority  that grants the type approval.  
7.1.4.  Contents of Part I, section (a) of installation manual  
7.1.4.1.  Retrofit system description : 
7.1.4.1.1.  Operational principles of the retrofit system . 
7.1.4.1.2.  Operatio nal principles of each component of the retrofit system . 
7.1.4.2  Proper assembly check  
7.1.4.2.1.  The installation manual shall contain the detailed procedures and actions 
which shall be taken by the installer to check whether the system has been 
assembled  in order to safely perform and to abide by the installation 
instructions.  
7.1.4.3  Start -up procedures  
7.1.4.3.1.  The installation manual shall contain the start -up operations which shall be 
performed by the installer.  
7.1.4.4.  Service instructions  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
26 7.1.4.4 .1. The installation manual shall contain the maintenance schedule in which all 
the ordinary service (type) which the single components as well as the system 
shall undergo through their working life (time in km covered by the vehicle) 
will be specified.  
7.1.4.4.2.  The installation manual shall specify the expertise necessary for the 
installation/service of the system.  
7.1.4.5.  System malfunction  
7.1.4.5.1.  The installation manual shall contain the actions which shall be taken in case 
the system malfunctions . 
7.1.4.6.  Diagnosis  
7.1.4.6.1.  If a diagnosis system is included in the conversion kit, the installation manual 
shall contain a detailed description of such a system together with the 
corrective actions which may be taken in case of malfunctioning.  
7.1.5.  Contents of Part II of installation manual  
7.1.5.1.  Retrofit system identification : 
7.1.5.1.1.  Retrofit system approval number ; 
7.1.5.1.2.  Vehicle manufacturer ; 
7.1.5.1.3.  Vehicle category ; 
7.1.5.1.4.  Vehicle type ; 
7.1.5.1.5.  Engine type ; 
7.1.5.1.6.  Engin e displacement ; 
7.1.5.1.7.  Transmission type ; 
7.1.5.1.8.  Vehicle model ; 
7.1.5.1.9.  Type of conversion retrofit (LPG or CNG) ; 
7.1.5.1.10.  Assembly instruction number ; 
7.1.5.1.11.  General scheme of the retrofit system containing the following information of 
each component:  
(a) Identification number;  
(b) Manufacturer's code ; 
(c) Type approval, if it exists ; 
(d) For the containers: capacity/manufacturer/type/date of expiry or 
replacement  date, if it exists . 
7.1.5.1.12.  Description (including drawings, if applic able) of the fitting devices of the 
container installation on the vehicle.  
7.1.5.2.  Installation instructions : 
7.1.5.2.1.  Assembly instructions of all components together with diagrams or 
photographs showing clearly the layout of the single components with in the 
engine compartment.  
7.1.5.2.2.  Diagram or photograph showing the exact position where the installer shall 
place the retrofit system type approval plate (contained in the conversion kit).  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
27 7.1.5.2.3.  Clear wiring diagram of the electrical system conta ining the mechanical 
components to which the wires shall be connected.  
  7.2.  End-user Manual  
7.2.1.  Scope  
 To specify the minimum requirements of the end -user manual for LPG/CNG 
systems maintenance.  
7.2.2.  General requirements : 
7.2.2.1.  The user manual h as the purpose to inform the end -user about the 
characteristics and safety features of the installed LPG/CNG systems.  
7.2.2.2.  The user manual shall be prepared by the manufacturer of the retrofit system.  
7.2.2.3.  The manufacturer of the system shall inclu de all the necessary information 
that is needed for correct use and safe operation of the LPG/CNG systems.  
7.2.2.4.  The user manual shall be considered as an integral part of the system and 
therefore be delivered with the LPG/CNG systems.  
7.2.2.5.  The user  manual shall be written in the language of the country to which the 
system is delivered.  
7.2.2.6.  The user manual shall indicate reference to the product type and version and 
production year for which it is applicable.  
7.2.2.7.  Information shall be given for relevant extreme ambient conditions.  
7.2.3.  Contents of the end -user manual : 
7.2.3.1.  Technical specifications  
 The user manual shall contain at least the following information:  
(a) Operating characteristics ; 
(b) Performance under normal operating con ditions ; 
(c) Extreme ambient conditions.  
7.2.3.2.  Safety instructions  
 The user manual shall give warning for dangers to health and safety 
categorised in the following way:  
(a) SUGGESTIONS for optimal use of the system ; 
(b) ATTENTION for possible problems due to misuse ; 
(c) WARNING for damage to persons or goods when procedures are not 
followed.  
 If and when safety symbols are used, they shall be in accordance with the 
international system, SI and their purpose shall be clearly specified in the 
user manual.  
 The user manual shall indicate proper actions to be taken in case the vehicle 
is repainted and put in a hot drying cabin.  
7.2.3.3.  LPG/CNG systems description  
 All the components of the LPG/CNG systems shall be clearly described for 
their purpose, use an d function.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
28 7.2.3.4.  First use and adjustment of the LPG/CNG systems  
 The user manual shall contain all the necessary information to the end user 
about initial running in and or adjustment of the system when needed.  
7.2.3.5.  Operating of the LPG/CNG system s 
7.2.3.5.1.  Filling of the LPG/CNG systems  
 The user manual shall indicate the sequence of operations needed to fill up 
the LPG/CNG containers.  Particular attention shall be paid to the maximum 
filling level of the 80 per cent in case of LPG.  
7.2.3.5.2.  Switch -over procedure  
 The user manual shall clearly describe the method of switching over from 
one to the other alternative fuel by giving the sequence of operations.  
7.2.3.5.3.  Opening/closing of manual valves  
 When fitted, the user manual shall indicate  the proper procedure to operate 
the manual valves.  
7.2.3.5.4.  Level indicator  
 The user manual shall state the location of the level indicator, for example at 
the dashboard or at the container.  Its read -out has to be clearly explained to 
the user, givin g particular attention to the 80 per cent filling level in case of 
LPG.  
7.2.3.5.5.  Maintenance  
 If maintenance is required, the user manual shall state the frequency and type 
of maintenance to be carried out.   
7.2.3.5.6.  Defects and repair  
 The user manua l shall indicate which actions have to be taken in the case of a 
defect of the system.  
 When the system is equipped with a diagnosis system the user manual shall 
describe this system and indicate proper actions to be taken.  
7.2.3.5.7.  Scrapping of the prod uct 
 The user manual shall give proper indication about precautions to be taken 
when the system has to be removed from the vehicle.  
  8. Modification and extension of approval of a retrofit 
system type  
8.1. Every modification of the installation of the spe cific equipment for the use of 
LPG or CNG in the propulsion system of the vehicle shall be notified to the 
Type Approval A uthority , which granted the retrofit system type approval.  
The Authority may then either:  
8.1.1.  Consider that the modifications made  are unlikely to have an appreciably 
adverse effect and that in any case the retrofit system still complies with the 
requirements, or  
8.1.2.  Require a further test report from the technical service responsible for 
conducting the tests.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
29 8.2. In both cases d escribed in paragraphs 8.1.1. and 8.1.2. above, the Authority 
shall be presented in the updated installation manual.  
8.3. Confirmation or refusal of approval, specifying the alteration, shall be 
communicated by the procedure specified in paragraph 5.4. abo ve to the 
Parties to the 1958 Agreement applying this Regulation.  
8.4. The Type Approval A uthority  issuing the extension of approval shall assign a 
series number for such an extension and inform thereof the other Parties to 
the 1958 Agreement applying to t his Regulation by means of a 
communication form conforming to the model in Annexes 1A and/or 1B to 
this Regulation.  
  9.  Conformity of production  
 The conformity of production procedures shall comply with those set out in 
the Agreement, Appendix 2 (E/ECE/ 324/Rev.2 - E/ECE/TRANS/505/Rev.2).  
  10.  Penalties for non -conformity of production  
10.1.  The approval granted in respect of a type of retrofit system pursuant to this 
Regulation may be withdrawn if the requirements laid down in paragraph 9 . 
above are no t complied with.  
10.2.  If a Party to the Agreement applying this Regulation withdraws an approval it 
has previously granted, it shall forthwith so notify the other Contracting 
Parties applying this Regulation, by means of a communication form 
conforming to  the models in Annexes 1A and/or 1B to this Regulation.  
  11.  Production definitively discontinued  
11.1.  If the holder of the approval completely ceases to manufacture a type of 
retrofit system approved in accordance with this Regulation, he shall so 
inform the Type Approval Authority which granted the approval.  Upon 
receiving the relevant communication, that Authority shall inform thereof the 
other Parties to the 1958 Agreement applying this Regulation by means of a 
communication form conforming to the m odel in Annexes 1A and/or 1B to 
this Regulation.  
  12. Names and addresses of Technical Services 
responsible for conducting approval tests, and of 
Type Approval Authorities  
12.1.  The Parties to the Agreement applying this Regulation shall communicate to 
the United Nations Secretariat the names and addresses of the Technical 
Services responsible for conducting approval tests and of the  Type Approval 
Authorities which grant approval and to which forms certifying approval or 
extension or refusal or withdrawal of approval, issued in other countries, are 
to be sent.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1   
Annex 1A  
30 Annex 1A  
  Communication  
(Maximum format:  A4 (210 x 297 mm))  
issued by:  Name of administration:  
......................................  
......................................  
........................ ..............  
1 
Concerning2: Approval granted  
Approval extended  
Approval refused  
Approval withdrawn  
Production definitively discontinued  
of a type of LPG retrofit equipment pursuant to Regulation No. 115  
Approval No.: ................. ................  Extension No.: ...... .................... ......... ...........  
1. LPG retrofit equipment considered:  
Container  
Accessories fitted to the container2 
80 per cent stop valve  
Level indicator  
Pressure relief valve (discharge valve)  
Pressure relief device  
Remote co ntrolled service valve with excess flow valve  
With/without LPG fuel pump2 
Multivalve, including the following accessories:  ................................ ..............   
Ventilation housing  
Power supply bushing (pump/actuators)2 
Fuel pump2 
Vaporiser/pressure regulator2 
  
 1  Distinguishing number of the country which has granted/extended/refused/withdrawn  approval 
(see approval provisions in the Regulation).  
 2  Strike out what does not apply.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1   
Annex 1A  
31 Shut-off valve2 
Non-return valve2 
Gas tube pressure relief valve2 
Service coupling2 
Flexible hose2 
Remote filling point2 
Gas injection device or injector2 
Gas dosage unit2 
Gas mixing piece2 
Electronic control unit2  
Pressure/temperature sensor2 
LPG filter unit2 
2. Trade name or mark  ................................ ................................ ................................ .....  
3. Manufacturer's name and address  ................................ ................................ ................   
4. Name and address of manufacturer's representative, if applicable  ..............................   
  ................................ ................................ ................................ ................................ ......  
5. Submitted for approval on  ................................ ................................ ...........................   
6. Technical Service responsible for conducting approval tests  ................................ ......  
 . ................................ ................................ ................................ ................................ .....  
7. Date of report issued by that Service  ................................ ................................ ...........   
8. No. of report issued by that Service  ................................ ................................ .............   
9. Approval granted/refused/extended/withdrawn2 ................................ ..........................   
10. Reason(s) of extension (if applicable)  ................................ ................................ ..........   
11. Vehicle types in which the retrofit system can be installed (M 1 and N 1 categories), or 
vehicle types in which the retrofi t system can be installed (other categories of 
vehicles) and, if applicable, CO 2 and power ratios (see Addendum to this annex)  ...... 
  ................................ ................................ ................................ ................................ ......  
11.1.  Emission requirements:  
 Regulation No. 83, ..... series of amendments3 
 Regulation No. 49, ..... series of amendm ents3 
11.2.  OBD requirements:  
 Has the retrofit system demonstrated to be "master -slave ": Yes/No2 
  
 3 Amendment in force at the time of the initial type approval of the vehicle or engine.    E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1   
Annex 1A  
32 12. Place  ................................ ................................ ................................ .............................   
13. Date ................................ ................................ ................................ ...............................   
14. Signature  ................................ ................................ ................................ .......................   
15. The documents filed with the application or extension of approval can be 
obtained upon request.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 1A – Addendum  
33 Annex 1A - Addendum  
  Addendum to the communication concerning a type of 
LPG retrofit equipment pursuant to Regulation No. 115  
(Approval No. .................................  Extension No. .................. ......... ...............)  
1. Vehicles on which the retrofit equipment has been tested:  
Vehicle No.  1 2 n 
Make:     
Type:     
Category:     
Emission limits:     
Power:     
Pollution control system type:     
2. Test results:  
Ratio CO 2LPG /CO 2 petrol2: …............................................... ........................... .............  
Ratio Power LPG /Power  petrol (or diesel) : .........................................................................  
3. Vehicles type(s) for which the retrofit equipment type is qualified:  
F
u
e
l Petrol (or diesel)1 LPG  
Vehicle 
type Engine 
type Power  
(kW)  CO3 
(g/km)  HC3 
(g/km)  NO x3 
(g/km)  CO 22 
(g/km)  Power  
(kW)  CO3 
(g/km)  HC3 
(g/km)  NOx3 
(g/km)  CO 22 
(g/km)  
            
            
            
            
1  Strike out what does not apply.  
2  Applicable to vehicles of categor ies M1 and N 1 only. 
3  Applicable only to parent vehicle(s).  
 
 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1 
Annex 1B  
34 Annex 1B  
  Communication  
(Maximum format:  A4 (210 x 297 mm))  
issued by:  Name of administration:  
......................................  
......................................  
.............................. ........  
1 
Concerning2: Approval granted  
 Approval extended  
 Approval refused  
 Approval withdrawn  
 Production definitively discontinued  
of a type of CNG retrofit equipment pursuant to Regulation No. 115  
Approval No. ......................................  Extension No. …….....................................  
1. CNG equipment comprising:  
 Container  
 Accessories fitted to the container2 
Level or pressure indicator  
Pressure relief valve (discharge valve)  
Remote -controlled automatic valve with excess flow va lve 
Pressure relief device  
Gas-tight housing  
 Pressure regulator2 
Automatic valve2 
Check valve2 
Flexible fuel line or hose2 
Filling unit2 
Gas/air mixer (injector)  
  
 1 Distinguishing number of the country which has granted/extended/refused /withdrawn approval 
(see approval provisions in the Regulation).   
 2 Strike out what does not apply.   E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 1B  
35 Flow gas adjuster  
Gas/air mixer (carburettor)  
Electronic control unit2 
Pressure/temperature s ensor2 
CNG filter2 
2. Trade name or mark  ................................ ................................ ................................ .....  
3. Manufacturer's name and address  ................................ ................................ ................   
4. Name and address of manufacturer's representative, if applicable  ..............................   
  ................................ ................................ ................................ ................................ ......  
5. Submitted for approval on  ................................ ................................ ...........................   
6. Technical Service responsible for conducting approval tests  ................................ ......  
  ................................ ................................ ................................ ................................ ......  
7. Date of report issued by that Service   ................................ ................................ ..........   
8. No. of report issued by that Service   ................................ ................................ ............   
9. Approval granted/refused/extended/withdrawn2   ................................ .........................   
10. Reason(s) of extension (if applicable)   ................................ ................................ ........   
11. Vehicle types in which the retrofit system can be installed (M 1 and N 1 
categories), or vehicle types in which the retrofit system can be installed (other 
categories of vehicles) and, if applicable, CO 2 and power ratio s (see Addendum 
to this annex)   ................................ ................................ ................................ ...............   
  ................................ ................................ ................................ ................................ ......  
11.1.  Emission requirements:  
 Regulation No. 83, ...  series of amendments3 
 Regulation No. 49, ... series of amendments3 
11.2.  OBD requirements:  
 Has the retrofit system demonstrated to be "master -slave ": Yes/No2 
12. Place:  ................................ ................................ ................................ ...........................   
13. Date:  ................................ ................................ ................................ ............................   
14. Signature:  ................................ ................................ ................................ .....................   
15. The documents filed with the application or extension of approval can be  
obtained upon request.  
 
  
 3 Amendment in force at the time of the initial type approval of the vehicle or engine.   E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 1B – Addendum  
36 Annex 1B - Addendum  
  Addendum to the communication concerning a type of 
CNG retrofit equipment pursuant to Regulation No. 115  
(Approval No. ....................................  Extension No. ....................................)  
1. Vehicles on which the retrofit equipment has been tested:  
Vehicle No.  1 2 n 
Make:     
Type:     
Category:     
Emission limits:     
Power:     
Pollution control 
system type:     
2. Test results:  
Ratio CO 2CNG / CO 2 petrol2:  ................................ ................................ ............................   
 Ratio Power CNG / Power petro l (or diesel) :  ................................ ................................ ............   
3. Vehicles type(s) for which the retrofit equipment type is qualified:  
F
u
e
l Petrol (or diesel)1 CNG  
Vehicle 
type Engine 
type Power 
(kW)  CO3 
(g/km)  HC3 
(g/km)  NOx3 
g/km)  CO 22 
(g/km)  Power 
(kW)  CO3 
(g/km)  HC3 
(g/km)  NOx3 
(g/km)  CO 22 
(g/km)  
            
            
            
            
1  Strike out what does not apply.  
2  Applicable to vehicles of categor ies M1 and N 1 only.  
3  Applicable only to parent vehicle(s).  
 
  
 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 2A  
37 Annex 2A  
  Arrangement of the LPG retrofit system type approv al 
mark  
 
 
 
a = 8 mm min.  
The above approval mark affixed to the plate of LPG retrofit system, shows that it 
has been approved in Italy (E  3), pursuant to Regulation No. 115 under approval 
number  000000.  The symbol "#" indicates the LPG  retrofit system, the first two digits of 
the approval number indicate that approval was granted in accordance to the requirement of 
Regulation No. 115 in its original form.  
 
#115R -000000  
 
The above  plate, with approval mark and some technical  information on the retrofit 
system, has to be fixed permanently on the body of the vehicle.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 2B  
38 Annex 2B  
  Arrangement of the CNG retrofit system type approval 
mark  
 
a = 8 mm min  
The above approval mark affixed to the plate of CNG retrofi t system, shows that it 
has been approved in Italy (E 3), pursuant to Regulation No. 115, under approval number 
000000.  The symbol "" indicates the CNG retrofit system, the first two digits of the 
approval number indicate that approval was granted in acc ordance to the requirement of 
Regulation No. 115 in its original form.  
 
*115R -000000  
 
The above plate, with approval mark and some technical information on the retrofit 
system, has to be fixed permanently on the body of the vehicle.  
 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 3A  
39 Annex 3A  
  Complete list of information for the purpose of the LPG 
retrofit system installed on vehicle type approval  
1. Description of the parent vehicle  
1.1. Name and address of the manufacturer  ................................ ................................ ....  
1.2. Category and identification type  ................................ ................................ ...............   
1.3. Chassis identificatio n number  ................................ ................................ ...................   
1.4. Certification number  ................................ ................................ ................................ .  
1.5. Internal combustion engine identification type  ................................ .........................   
1.5.1.  Working principle and thermodynamic cycle  ................................ ...........................   
1.5.2.  Naturally aspirated or pressure charged  ................................ ................................ ....  
1.5.3.  Displacement  ................................ ................................ ................................ ............   
1.5.4.  Catalyst system type ................................ ................................ ................................ .  
1.5.5.  Ignition system type  ................................ ................................ ................................ .  
2. Description of the LPG retrofit system  
2.1. Trade name or mark holder  ................................ ................................ ......................   
2.2. Identification type  ................................ ................................ ................................ ....  
2.3. Drawing / flow -charts of the installation in the vehicle  ................................ ...........   
2.4. "Master -slave " system: Yes/No1 
2.5. Vaporiser/pressure regulator(s)  
2.5.1. Make(s)  ................................ ................................ ................................ ....................   
2.5.2.  Type(s)  ................................ ................................ ................................ .....................   
2.5.3.  Certification number  ................................ ................................ ................................   
2.5.4.  Identification  ................................ ................................ ................................ ............   
2.5.5.  Drawings  ................................ ................................ ................................ ..................   
2.5.6.  Number of main adjustment points  ................................ ................................ ..........   
2.5.7.  Description of principle of adjustment through main adjustment points  .................   
2.5.8.  Number of idle adjustment  points  ................................ ................................ ............   
2.5.9.  Description of principle of adjustment through idle adjustment points  ...................   
2.5.10.  Other adjustment possibilities: if so and which (description and drawings)  ............   
  
 1 Strike out what does not apply.   E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 3A  
40 2.5.11.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.6. Mixing piece: Yes/No1 
2.6.1.  Number  ................................ ................................ ................................ ....................   
2.6.2. Make(s)  ................................ ................................ ................................ ....................   
2.6.3.  Type(s)  ................................ ................................ ................................ .....................   
2.6.4.  Drawings  ................................ ................................ ................................ ..................   
2.6.5.  Place of installation (include drawing(s))  ................................ ................................   
2.6.6.  Adjustment possibilities  ................................ ................................ ...........................   
2.6.7.  Operating pressure(s)  2: ................................ ................................ .......................  kPa 
2.7. Gas dosage unit: Yes/No1 
2.7.1.  Number  ................................ ................................ ................................ ....................   
2.7.2.  Make(s)  ................................ ................................ ................................ ....................   
2.7.3.  Type(s)  ................................ ................................ ................................ .....................   
2.7.4. Drawings  ................................ ................................ ................................ ..................   
2.7.5.  Place of installation (include drawing(s))  ................................ ................................ .  
2.7.6.  Adjustment possibilities  ................................ ................................ ...........................   
2.7.7.  Operating pressure(s)2: ................................ ................................ ........................  kPa 
2.8. Gas injection device(s) or injector(s): Yes/No1 
2.8.1.  Make(s)  ................................ ................................ ................................ ....................   
2.8.2.  Type(s)  ................................ ................................ ................................ .....................   
2.8.3.  Identification  ................................ ................................ ................................ ............   
2.8.4.  Operating pressure(s) 2:  ................................ ................................ ......................  kPa 
2.8.5.  Drawings of installation  ................................ ................................ ...........................   
2.9. Electronic control unit  
2.9.1.  Make(s)  ................................ ................................ ................................ ....................   
2.9.2.  Type(s)  ................................ ................................ ................................ .....................   
2.9.3.  Place of installation  ................................ ................................ ................................ ..  
2.9.4.  Adjustment possibilities  ................................ ................................ ...........................   
2.10.  LPG container  
2.10.1.  Make(s)  ................................ ................................ ................................ ....................   
2.10.2.  Type(s) (include draw ings)  ................................ ................................ ......................   
2.10.3.  Number of containers  ................................ ................................ ...............................   
2.10.4.  Capacity  ................................ ................................ ................................ ............  litres  
  
 2 Specify the tolerance .  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.11 4/Rev.1  
Annex 3A  
41 2.10.5.  LPG fuel pump in container: Yes/No1  ................................ ................................ .....  
2.10.6.  Certification number  ................................ ................................ ................................    
2.10.7.  Drawings of the installation of the container  ................................ ...........................   
2.11.  LPG container accessories  
2.11.1.  80 per cent stop v alve:  
2.11.1.1.  Make(s)  ................................ ................................ ................................ .....................   
2.11.1.2.  Type(s)  ................................ ................................ ................................ ......................   
2.11.1.3.  Operating principle: float/other1 (include description or drawings)  
2.11.2.  Level indicator:  
2.11.2.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.2.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.2.3.  Operating principle: float/other1 (include description or d rawings)  
2.11.3.  Pressure relief valve (discharge valve):  
2.11.3.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.3.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.4.  Pressure relief device:  
2.11.4.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.4.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.5.  Remote -controlled service valve with excess flow valve:  
2.11.5.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.5.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.6.  Multi -valve: Yes/No1 
2.11.6.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.6.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.6.3.  Multi -valve description (include drawings)  ................................ .............................   
2.11.7.  Ventilation housing:  ................................ ................................ ................................ .  
2.11.7.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.7.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.8.  Power supply bushing (fuel pump/act uators):  
2.11.8.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.8.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.8.3.  Drawings  ................................ ................................ ................................ ..................   
2.12.  Fuel pump (LPG): Yes/No1 
2.12.1.  Make(s)  ................................ ................................ ................................ ....................   
2.12.2.  Type(s)  ................................ ................................ ................................ .....................   E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 3A  
42 2.12.3.  Pump mounted in LPG container: Yes/No1 
2.12.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.13.  Shut-off valve/ non -return va lve/gas tube pressure relief valve: Yes/No1 
2.13.1.  Make(s)  ................................ ................................ ................................ ....................   
2.13.2.  Type(s)  ................................ ................................ ................................ .....................   
2.13.3.  Description and drawings  ................................ ................................ .........................   
2.13.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.14.  Filling point1:  
2.14.1.  Make(s)  ................................ ................................ ................................ ....................   
2.14.2.  Type(s)  ................................ ................................ ................................ .....................   
2.14.3.  Description and drawings  
2.15.  Flexib le fuel hose(s)/pipes:  
2.15.1.  Make(s)  ................................ ................................ ................................ ....................   
2.15.2.  Type(s)  ................................ ................................ ................................ .....................   
2.15.3.  Description  ................................ ................................ ................................ ...............   
2.15.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.16.  Pressure and temperature sensor(s)1: 
2.16.1.  Make(s)  ................................ ................................ ................................ ....................   
2.16.2.  Type(s)  ................................ ................................ ................................ .....................   
2.16.3.  Description  ................................ ................................ ................................ ...............   
2.16.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.17.  LPG filter unit(s)1:  
2.17.1.  Make(s)  ................................ ................................ ................................ ....................   
2.17.2.  Type(s)  ................................ ................................ ................................ .....................   
2.17.3.  Description  ................................ ................................ ................................ ...............   
2.17.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.18.  Service coupling(s) (mono -fuel vehicle without limp -home system)1:  
2.18.1.  Make(s)  ................................ ................................ ................................ ....................   
2.18.2.  Type(s)  ................................ ................................ ................................ .....................   
2.18.3.  Description and  drawings installation  
2.19.  Connection to LPG system for heating system (allowed for M 2 and M 3 
categories of vehicles): Yes/No1 
2.19.1  Make(s)  ................................ ................................ ................................ ....................   
2.19.2.  Type(s)  ................................ ................................ ................................ .....................   
2.19.3.  Description and drawings of installation  ................................ ................................ ..  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.11 4/Rev.1  
Annex 3A  
43 2.20.  Further documentation  
2.20.1.  Descr iption of the LPG equipment and the physical safeguarding of the catalyst 
at switch -over from petrol to LPG or back.  
2.20.2.  System lay -out (electrical connections, vacuum connections compensation 
hoses,  etc.) 
2.20.3.  Drawing of the symbol  
2.20.4.  Adjustme nt data  
2.21.  Cooling system: (liquid/air)1 
2.21.1.  System description/drawings with regard to the LPG equipment  
 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 3B  
44  
Annex 3B  
  Complete list of information for the purpose of the CNG 
retrofit system installed on vehicle type approval  
1. Description of the parent vehicle  
1.1. Name and address of the manufacturer  ................................ ................................ ....  
1.2. Category and identification type  ................................ ................................ ..............   
1.3. Chassis identification number  ................................ ................................ ..................   
1.4. Certification number  ................................ ................................ ................................   
1.5. Internal combustion engine identification type  ................................ ........................   
1.5.1.  Working principle and thermodyn amic cycle  ................................ ..........................   
1.5.2.  Naturally aspirated or pressure charged  ................................ ................................ ...  
1.5.3.  Displacement  ................................ ................................ ................................ ............   
1.5.4.  Catalyst system type ................................ ................................ ................................ .  
1.5.5.  Ignition system type  ................................ ................................ ................................ .  
2. Description of the CNG  retrofit  system  
2.1. Trade name or mark holder  ................................ ................................ ......................   
2.2. Identification type  ................................ ................................ ................................ ....  
2.3. Drawing / flow -charts of the installation in the vehicle  ................................ ...........   
2.4. "Master -slave " system: Yes/No1 
2.5. Pressure regulator(s)  
2.5.1.  Make(s)  ................................ ................................ ................................ ....................   
2.5.2.  Type(s)  ................................ ................................ ................................ .....................   
2.5.3.  Certification number  ................................ ................................ ................................   
2.5.4.  Identification  ................................ ................................ ................................ ............   
2.5.5.  Drawings  ................................ ................................ ................................ ..................   
2.5.6.  Number of main adjustmen t points  ................................ ................................ ..........   
2.5.7.  Description of principle of adjustment through main adjustment points  .................   
2.5.8.  Number of idle adjustment points  ................................ ................................ ............   
2.5.9.  Description of principle of adjustment through idle adjustment points  ...................   
2.5.10.  Other adjustment possibilities: if so  which (description and drawings)  ...................   
  
 1 Strike out what does not apply.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add. 114/Rev.1  
Annex 3B  
45 2.5.11.  Operating pressure(s)2:   ................................ ................................ ......................  kPa 
2.6. Gas / air mixer (carburettor): Yes/No1 
2.6.1.  Number  ................................ ................................ ................................ ....................   
2.6.2.  Make(s)  ................................ ................................ ................................ ....................   
2.6.3.  Type(s)  ................................ ................................ ................................ .....................   
2.6.4.  Drawings  ................................ ................................ ................................ ..................   
2.6.5.  Place of installation (include drawing(s))  ................................ ................................ .  
2.6.6.  Adjustment p ossibilities  ................................ ................................ ...........................   
2.6.7.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.7. Flow gas adjuster: Yes/No1 
2.7.1.  Number  ................................ ................................ ................................ ....................   
2.7.2.  Make(s)  ................................ ................................ ................................ ....................   
2.7.3.  Type(s)  ................................ ................................ ................................ .....................   
2.7.4.  Drawings  ................................ ................................ ................................ ..................   
2.7.5.  Place of installation (include drawing(s))  ................................ ................................   
2.7.6.  Adjustment possibilities  ................................ ................................ ...........................   
2.7.7.  Operating pr essure(s)2:  ................................ ................................ .......................  kPa 
2.8. Gas /air mixer (injector): Yes/No1 
2.8.1.  Make(s)  ................................ ................................ ................................ ....................   
2.8.2.  Type(s)  ................................ ................................ ................................ .....................   
2.8.3.  Identification  ................................ ................................ ................................ ............   
2.8.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.8.5.  Drawings of installation  ................................ ................................ ...........................   
2.9. Electronic control unit  
2.9.1.  Make(s)  ................................ ................................ ................................ ....................   
2.9.2.  Type(s)  ................................ ................................ ................................ .....................   
2.9.3.  Place of installation  ................................ ................................ ................................ ..  
2.9.4.  Adjustment possibilities  ................................ ................................ ...........................   
2.10.  CNG container  
2.10.1.  Make(s)  ................................ ................................ ................................ ....................   
2.10.2.  Type(s) (include drawings)  ................................ ................................ ......................   
2.10.3.  Number of containers  ................................ ................................ ...............................   
2.10.4.  Total capacity  ................................ ................................ ................................ ... litres  
  
 2 Specify the tolerance.   E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 3B  
46 2.10.5.  Certification number  ................................ ................................ ................................   
2.10.6.  Drawings of the install ation of the container  ................................ ...........................   
2.11.  CNG container accessories  
2.11.1.  Level or pressure indicator:  
2.11.1.1  Make(s)  ................................ ................................ ................................ ....................   
2.11.1.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.2.  Pressure relief valve (discharge valve)1: 
2.11.2.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.2.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.3  Pressure relief device:  
2.11.3.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.3.2  Type(s)  ................................ ................................ ................................ .....................   
2.11.4.  Remote controlled automatic valve with excess flow valve:  
2.11.4.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.4.2.  Type(s)  ................................ ................................ ................................ .....................   
2.11.5.  Gas-tight housing:  
2.11.5.1.  Make(s)  ................................ ................................ ................................ ....................   
2.11.5.2.  Type(s)  ................................ ................................ ................................ .....................   
2.12.  Automatic valve/check valve: Yes/No1 
2.12.1. Make(s)  ................................ ................................ ................................ ....................   
2.12.2.  Type(s)  ................................ ................................ ................................ .....................   
2.12.3.  Description and drawings  ................................ ................................ .........................   
2.12.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.13.  Filling unit1:  
2.13.1.  Make(s)  ................................ ................................ ................................ ....................   
2.13.2.  Type(s)  ................................ ................................ ................................ .....................   
2.13.3.  Description and drawings  ................................ ................................ .........................   
2.14.  Flexible fuel lines or hose(s):  
2.14.1  Make(s)  ................................ ................................ ................................ ....................   
2.14.2. Type(s)  ................................ ................................ ................................ .....................   
2.14.3.  Description  ................................ ................................ ................................ ...............   
2.14.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.15.  Pressure and temperature sensor(s)1:  
2.15.1.  Make(s)  ................................ ................................ ................................ ....................   
2.15.2.  Type(s)  ................................ ................................ ................................ .....................   E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add. 114/Rev.1  
Annex 3B  
47 2.15.3.  Description  ................................ ................................ ................................ ...............   
2.15.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.16.  CNG filter1:  
2.16.1.  Make(s)  ................................ ................................ ................................ ....................   
2.16. 2. Type(s)  ................................ ................................ ................................ .....................   
2.16.3.  Description  ................................ ................................ ................................ ................   
2.16.4.  Operating pressure(s)2:  ................................ ................................ .......................  kPa 
2.17.  Service coupling(s) (mono -fuel vehicle without limp -home system)1:  
2.17.1.  Make(s)  ................................ ................................ ................................ ....................   
2.17.2.  Type(s)  ................................ ................................ ................................ .....................   
2.17.3.  Description and drawings installation  ................................ ................................ .......  
2.18.  Connection to CNG syst em for heating system (allowed for M 2 and M 3 category 
of vehicles only):  Yes/No1 
2.18.1.  Make(s)  ................................ ................................ ................................ ....................   
2.18.2.  Type(s)  ................................ ................................ ................................ .....................   
2.18.3.  Description and drawings installation  ................................ ................................ ......  
2.19.  Further documentation  
2.19.1.  Description of the CNG equipment and the physical safeg uarding of the catalyst 
at switch -over from petrol to CNG or back.  
2.19.2.  System lay -out (electrical connections, vacuum connections compensation hoses, 
etc.) 
2.19.3.  Drawing of the symbol  
2.19.4.  Adjustment data  
2.20.  Cooling system: (liquid/air)1 
2.20.1 .  System description/drawings with regard to the CNG equipment  ...........................   
  ................................ ................................ ................................ ................................ ..   
 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 4  
 
48 Annex 4  
  Description of the leakage test procedures for CNG/LPG 
systems installed on vehicles  
1. Scope  
 To describe the procedures to be undertaken by the installer to verify the gas 
tightness of the system.  
2. The installation of the system shall be done in accordance with the 
installation manual provided by the retrofit system manufacturer, Part s I  
and II.  
3. Leakage test procedure for LPG systems  
3.1. When the installation has be en completed, the installer shall follow the 
proper assembly check, paragraph 7.1.4.2. of this Regulation and the start -up 
procedures described in paragraph 7.1.4.3. of this Regulation. After that the 
system has been filled -up with LPG; it is necessary to check with a gas 
detector or a leakage fluid detector all the fittings and connections of the 
system. The solenoid valves shall be in open position in order to subject all 
the components of the system to the service pressure.  No evidence of 
leakage is per mitted.  
4. Leakage test procedures for CNG systems  
4.1. When the installation has been completed, the installer shall follow the 
proper assembly check, paragraph 7.1.4.2. and the start -up procedures 
described in paragraph 7.1.4.3. of this Regulation.  After that the system has 
been filled -up with CNG, at the service pressure; it is necessary to check with 
a gas detector or a leakage fluid detector all the fittings and connections of 
the system.  The solenoid valves shall be in open position in order to sub ject 
all the components of the system to the service pressure.  No evidence of 
leakage is permitted.  
 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 5  
 
49 Annex 5  
  Prescriptions concerning the fixation of LPG and CNG 
container(s)  
1. The requirements of Regulation No. 67, 01 series of amendments, concernin g 
the fixation of LPG container(s) or those of Regulation No. 110 concerning 
the fixation of CNG container(s) shall be deemed to be met if the container is 
secured to the motor vehicle by at least:  
1.1. Two straps per container;  
1.2. Four bolts; and  
1.3. Appropriate washers or plates if the body panels at that location are single 
thickness.  
 Assuming that the material grade is Fe 370, the fixing bolts shall be of 
class  8.8, and have the dimensions specified in Table 1 below:  
Table 1  
Container content  
(litre s) Minimum dimensions of the 
washers or plates (mm)  Minimum dimensions of the 
container straps (mm)  Minimum diameter of bolts 
(mm)  
Up to 85  round: 30 x 1.5  
round: 25 x 2.5  20 x 3  
30 x 1.5  8 
85 - 100 
 round: 30 x 1.5  
round: 25 x 2.5  30 x 3  
20 x 3*  10 
8* 
100 - 150 round: 50 x 2  
round: 30 x 3  50 x 6  
50 x 3**  12 
10**  
More than 150  shall meet the provisions of Regulation No. 67, 01 series of amendments, 
for LPG containers, or Regulation No. 110 for CNG containers  
*    In this case the container shall be s ecured by at least three container straps.  
**  In this case the container shall be secured by at least four container straps.  
  
2. If the container is installed behind a seat, a total clearance of at least 100 mm, 
in the longitudinal direction of the veh icle, shall be provided.  This clearance 
may be divided between the container and the rear panel of the vehicle and 
between the seat and the container.  
3. If the container straps also carry the mass of the fuel container, at least three 
container straps sh all be provided.  
4. The container straps shall ensure that the fuel container will not slide, rotate 
or be dislodged.  
5. A protective material such as felt, leather or plastic shall be interposed 
between the fuel container and the container straps.  Howeve r, at the location 
of the fixation of the washers or plates to the vehicle body no compressible 
material should be present.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 5  
50 6. Container frame  
6.1. If the container is secured to the motor vehicle by a container frame, the 
container frame, the container s traps, washers, or plates and bolts used shall 
meet the provisions of paragraphs 1. to 5. above.  
6.2. If the cylindrical container is installed longitudinally to the vehicle, a 
transverse connection shall be present at the front of the container frame to 
prevent slipping of the container.  This transverse connection shall be:  
6.2.1.  At least of the same thickness as the container frame ; 
6.2.2.  At least 30 mm high and its top is at least 30 mm above the bottom of the 
container ; 
6.2.3.  As close as possible, o r even within, the domed end of the container.  
 By "installed longitudinally " it is meant that the axis of the cylindrical fuel 
container makes an angle of no more than 30 degrees with the longitudinal 
centre plane of the vehicle.  E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 6A  
 
51 Annex 6A  
  Bi-fuel vehic les with petrol direct injection engines - 
Calculation of LPG energy ratio  
1. Measurement of the LPG mass consumed during the cycle  
Measurement of the LPG mass consumed during the Type I test cycle shall 
be done by a  fuel weighing system capable of measuri ng the weight of the 
LPG storage container during the test in accordance with the following:  
An accuracy of ±2 per cent of the difference between the readings at the 
beginning and at the end of the test or better.  
Precautions shall be taken to avoid measur ement errors.  
Such precautions shall , at least , include the careful installation of the device 
according to the instrument manufacturers’ recommendations and to good 
engineering practice.  
Other measurement methods are permitted if an equivalent accuracy ca n be 
demonstrated.  
2. Calculation of the LPG energy ratio  
The fuel consumption value shall be calculated from the emissions of 
hydrocarbons, carbon monoxide, and carbon dioxide determined from the 
measurement results assuming that only LPG is burned during  the test.  
The LPG ratio of the energy consumed in the cycle is then determined as 
follows:  
GLPG =  MLPG*10,000/(FC mean*dist*d)  
Where:  
GLPG:  the LPG energy ratio  (%); 
MLPG:  the LPG mass consumed during the cycle (kg);  
FC mean:  the mean fuel consumption (l/100  km) calculated in accordance 
with paragraph 6.1.2.4.3.2.  of this Regulation ; 
dist:  distance travelled during the cycle (km);  
d:  density d  = 0.538kg/liter.  
 E/ECE/324/Rev.2/Add.114/ Rev.1  
E/ECE/TRANS/505/Rev.2/Add.114/ Rev.1  
Annex 6B  
 
52 Annex 6B  
  Bi-fuel vehicles with petrol direct injection engines - 
Calculation of CNG ener gy ratio  
1. Measurement of the CNG mass consumed during the cycle  
Measurement of the CNG mass consumed during the Type I test cycle shall 
be done by a  fuel weighing system capable of measuring  the weight of the 
CNG storage container during the test in acco rdance with the following:  
An accuracy of ±2 per cent of the difference between the readings at the 
beginning and at the end of the test or better.  
Precautions shall be taken to avoid measurement errors.  
Such precautions shall , at least , include the carefu l installation of the device 
according to the instrument manufacturers’ recommendations and to good 
engineering practice.  
Other measurement methods are permitted if an equivalent accuracy can be 
demonstrated.  
2. Calculation of the CNG energy ratio  
The fuel  consumption value shall be calculated from the emissions of 
hydrocarbons, carbon monoxide, and carbon dioxide determined from the 
measurement results assuming that only CNG is burned during the test.  
The CNG ratio of the energy consumed in the cycle is th en determined as 
follows:  
GCNG =  MCNG*cf*10,000/(FC mean*dist*d)  
Where:  
GCNG:  the CNG energy ratio  (%); 
MCNG:  the CNG mass consumed during the cycle (kg);  
FC mean:  the mean fuel consumption (m3/100 km) calculated in accordance 
with paragraph. 6.2.2.4.3. 2. of this Regulation ; 
dist:  distance travelled during the cycle (km);  
d:  density d  = 0.654kg/m3; 
cf:  correction factor, assuming the following values:  
cf = 1 in case of G20 reference fuel;  
cf = 0.78 in case of G25 reference fuel.