Regulation No 59 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of replacement silencing systems
Date: 2006-11-24
Institutions: United Nations Economic Commission for Europe
Subjects: Ecosoc, anti-pollution device, approval, noise, vehicle parts

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Regulation No 59 of the Economic Commission for Europe of the United Nations (UN/ECE) —
Uniform provisions concerning the approval of replacement silencing systems

1.

SCOPE

This Regulation contains provisions relating to the approval of silencing systems or components
thereof to be fitted to one or more given types of motor vehicles in categories M1 and N1 (1) as
replacement parts.

2.

DEFINITIONS

For the purpose of this Regulation,

2.1.

2.2.

2.3.

‘Silencing system’ means a complete set of components necessary for limiting the noise
produced by the engine of a motor vehicle and its exhaust;

‘Silencing system component’ means one of the separate components which together form the
exhaust system (e.g. silencer proper, expansion chamber, resonator);

‘Silencing system of different types’ means silencing systems which differ significantly in such
respects as:

2.3.1.

that their components bear different trade names or marks,

2.3.2.

that the characteristics of the materials constituting a component are different or that the
components differ in shape or size, a modification regarding the coating (zinc coating, alumi-
nium coating, etc.) is not considered changing the type,

2.3.3.

that the operating principles of at least one component are different,

2.3.4.

that their components are combined differently;

2.4.

2.5.

2.6.

‘Replacement silencing system or components of said system’ means any part of the exhaust
system defined in paragraph 2.1. above, intended for use on a vehicle, other than a part of the
type fitted to this vehicle when submitted for type approval pursuant to this Regulation;

‘Approval of a replacement silencing system or components of said system’ means the approval
of the whole or part of a silencing system adaptable to one or several specified types of motor
vehicles, as regards the limitation of their noise level;

‘Vehicle type’ means a category of motor vehicles which do not differ significantly in such
respects as:

2.6.1.

the lines and constituent materials of the body (more particularly the engine compartment and
its soundproofing),

2.6.2.

the length and width of the vehicle,

2.6.3.

the type of engine (positive ignition, compression ignition, two stroke or four stroke, recipro-
cating or rotary), number and capacity of cylinders, number of carburetors, arrangement of
valves, maximum horse-power and corresponding engine speed (r.p.m.), etc.

2.6.4.

number and ratios of gears, total ratio of the transmission,

2.6.5.

the number, type and arrangement of the exhaust systems, and

2.6.6.

the number, type and arrangement of the intake systems.

(1) Category M: Power-driven vehicles having at least four wheels or having three wheels when the maximum weight
exceeds 1 metric ton, and used for the carriage of passengers. (articulated vehicles comprising two non-separable but
articulated units shall be considered as single vehicles.)
Category M1: Vehicles used for the carriage of passengers and comprising not more than eight seats in addition to
the driver's seat.
Category N: Power-driven vehicles having at least four wheels or having three wheels when the maximum weight
exceeds 1 metric ton and used for the carriage of goods.
Category N1: Vehicles used for the carriage of goods and having a maximum weight not exceeding 3,5 metric tons.
In conformity with ‘Classification of
505/Rev.1/Add.12/Rev.2, paragraph 5.2.).

in Regulation No 13 (E/ECE/324 — E/ECE/TRANS/

vehicles’

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3.

3.1.

3.2.

3.2.1.

3.2.2.

3.2.3.

3.3.

APPLICATION FOR APPROVAL

The application for approval of a replacement silencing system or components of said system
shall be submitted by its manufacturer or by this duly accredited representative.

It shall be accompanied by the undermentioned documents in triplicate and the following parti-
culars:

a description of the vehicle type(s) on which the system or components is intended to be
mounted, with regard to the items mentioned in paragraph 2.6. above. The numbers and/or
symbols identifying the engine type and the vehicle type shall be specified and the vehicle type
approval number, if necessary;

a description of the assembled silencing system showing the relative position of each of its
components, as well as mounting instructions;

detailed drawings of each component to enable it to be easily located and identified, and a speci-
fication of the material used.

On request of the technical service conducting the tests for approval, the manufacturer of the
silencing system shall submit:

3.3.1.

two samples of the system or components submitted for approval;

3.3.2.

3.3.3.

3.3.3.1.

a sample of the original silencing system with which the vehicle was equipped when submitted
for type approval;

a vehicle representative of the type to which the system is to be fitted; this vehicle, when
measured for noise emission according to the methods described in paragraphs 3.1. and 3.2. of
annex 3 to Regulation No 51, must satisfy the following conditions:

the noise level when the vehicle is in motion must not exceed the limit applicable to the cate-
gory of vehicle concerned at the time when the type to which the vehicle belongs was approved;
furthermore, it must not exceed by more than 3 dB(A) the noise level indicated in the approval
off the type to which the vehicle belongs;

3.3.3.2.

the noise level when the vehicle is stationary must not exceed by more than 3 dB (A) the refer-
ence value indicated in the approval of the type to which the vehicle belongs;

3.3.4.

A separate engine, of at least the same cylinder capacity and power as that of the abovemen-
tioned vehicle.

4.

4.1.

MARKINGS

Each component of the replacement silencing system, excluding tubes and mounting accessories,
shall bear:

4.1.1.

the trade name or mark of the manufacturer of the system or its components,

4.1.2.

the commercial description given by the manufacturer.

4.2.

Such markings shall be clearly legible and indelible.

5.

5.1.

5.2.

APPROVAL

If the type of replacement silencing system submitted for approval pursuant to this Regulation
meets the requirements of paragraph 6. below, approval for that type shall be granted.

An approval number shall be assigned to each type approved. Its first two digits (at present 00
for 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 Contracting Party may not assign the same number to another type of repla-
cement silencing system or component designed for the same type(s) of vehicle.

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5.3.

5.4.

5.4.1.

5.4.2.

5.4.3.

5.5.

5.6.

6.

6.1.

6.1.1.

6.1.2.

Notice of approval or of refusal of approval of a replacement silencing system or components of
said system pursuant to this Regulation shall be communicated to the Parties to the Agreement
which apply this Regulation, by means or a form conforming to the model in annex 1 to the
Regulation, and of drawings of the silencing system or components supplied by the applicant
for approval, in a format not exceeding A4 (210 × 297 mm) or folded to that format and on an
appropriate scale.

There shall be affixed to every component of silencing system conforming to a type approved
under this Regulation an international approval mark consisting of:

a circle surrounding the letter ‘E’ followed by the distinguishing number of the country which
has granted approval (1);

the number of this Regulation, followed by the letter ‘R’, a dash and the approval number to the
right of the circle prescribed in paragraph 5.4.1.;

the approval number shall be mentioned in the approval form, as well as the method used for
approval tests.

The approval mark shall be easily legible and indelible, when the silencing system is mounted
on the vehicle.

A component may be marked with more than one approval number if it has been approved as
in this case the circle need not be
a part of more than one replacement silencing system;
repeated. Annex 2 to this Regulation gives an example of the arrangement of the approval
mark.

SPECIFICATIONS

General specifications

The replacement, exhaust system or components thereof must be designed, constructed and
capable of being mounted so as to ensure that the vehicle complies with the provisions of this
Regulation under normal conditions of use, notwithstanding any vibrations to which it may be
subject.

The silencing system or components thereof must be designed, constructed and capable of being
mounted so that reasonable resistance to the corrosion phenomenon to which it is exposed is
obtained having regard to the conditions of use of the vehicle.

6.2.

Specifications regarding noise levels

6.2.1.

The acoustic efficiency of the replacement silencing system or components of said system shall
be verified by means of the methods described in paragraphs 3.1. and 3.2. of annex 3 to Regu-
lation No 51. When the replacement silencing system or components thereof is mounted on the
vehicle described in paragraph 3.3.3. above, the noise levels obtained using the two methods
(stationary and running vehicle) shall satisfy one of the following conditions:

6.2.1.1.

they shall not exceed the values obtained with the type of vehicle concerned when submitted for
type approval,

6.2.1.2.

they shall not exceed the noise values measured on the vehicle referred to in paragraph 6.2.1.
above when this is fitted with an exhaust silencing system corresponding to the type fitted to
the vehicle when submitted for type approval.

6.3.

Measurement of the vehicle performances

6.3.1.

The replacement exhaust system or components thereof must be such as to ensure that vehicle
performance is comparable with that achieved with the original equipment exhaust system or
component thereof.

(1) 1 for the Federal Republic of Germany, 2 for France, 3 for Italy, 4 for the Netherlands, 5 for Sweden; 6 for Belgium,
7 for Hungary, 8 for Czechoslovakia, 9 for Spain, 10 for Yugoslavia, 11 for the United Kingdom, 12 for Austria, 13
for Luxembourg, 14 for Switzerland, 15 for the German Democratic Republic, 16 for Norway, 17 for Finland, 18 for
Denmark, 19 for Romania, 20 for Poland and 21 for Portugal. Subsequent numbers shall be assigned to other coun-
tries in the chronological order in which they ratify or accede to the Agreement concerning the Adoption of
Uniform Conditions of Approval and Reciprocal Recognition of Approval for Motor Vehicle Equipment and Parts,
and the numbers thus assigned shall be communicated by the Secretary-General of the United Nations to the
Contracting Parties to the Agreement.

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6.3.2.

6.3.3.

The replacement silencing system or, depending on the manufacturer's choice, the components
of said system shall be compared with an original silencing system or components, which are
also in new condition, successively mounted on the vehicle mentioned in paragraph 3.3.3.
above.

The verification shall be carried out by measuring the back pressure pursuant to paragraph 6.3.4.
below. The value measured with the replacement silencing system shall not exceed the value
measured with the original standard silencing system by more than 25 per cent under the condi-
tions mentioned below.

6.3.4.

Test method

6.3.4.1.

Te st me t h od w i th e n g i ne

The measurements shall be conducted on the engine referred to in paragraph 3.3.4. above
coupled to a dynamometer. With the throttle completely open, the bench shall be adjusted so as
to obtain the engine speed(s) corresponding to the rated maximum power of the engine. For the
measurement of back pressure, the distance at which the pressure tap shall be placed from the
exhaust manifold is indicated in annex 4 to this Regulation.

6.3.4.2

Te st me t h od w i th v e h i c le

The measurements shall be carried out on the vehicle referred to in paragraph 3.3.3. above.

The test shall be conducted:

either on the road,

or on a roller dynamometer.

With the throttle completely open, the engine must be loaded so as to obtain the engine speed
corresponding to the rated maximum power of the engine (engine speed S).

For the measurement of back pressure, the distance at which the pressure tap shall be placed
from the exhaust manifold is indicated in annex 4 to this Regulation.

6.4.

Additional specifications regarding silencing systems or components filled with fibrous
materials

Absorbing fibrous materials may be used in silencing systems or components only when it is
established by appropriate means of design and manufacturing, that the efficiency of the system
in traffic conditions is sufficient. to comply with the existing regulations. Such a silencing
system is deemed to be effective in traffic conditions if the exhaust gas is not in contact with the
fibrous materials or if, the silencing system being emptied of its absorbing materials and tested
on vehicle in conformity with the procedures described in Regulation No 51, Annex 3, para-
graphs, 3.1 and 3.2., the acoustic pressure levels comply with the provisions laid down in para-
graph 6.2. above.

If that condition is not fulfilled, the complete silencing system shall be submitted to conven-
tional conditioning using one of the three installations and procedures described below. When
the procedure described in paragraph 6.2.1.2. above is employed, the applicant for approval
may ask for the emptying or the conditioning of the original silencing system.

6.4.1.

Continuous road operation for 10 000 km

6.4.1.1. About half this operation shall consist of town driving and the other half of long-distance runs
at high speed: continuous road operation can be replaced by a corresponding test-track
programme.

6.4.1.2.

The two engine speeds must be alternated several times.

6.4.1.3.

The complete test programme must include a minimum of 10 breaks of at least three-hour dura-
tion in order to reproduce the effects of cooling and any condensation which may occur.

6.4.2.

Conditioning on a test bench

6.4.2.1. Using standard parts and observing the vehicle manufacturer's instructions, the silencer must be

fitted to the engine, which is coupled to a dynamometer.

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6.4.2.2.

The test must be conducted in six six-hour periods with a break of at least 12 hours between
each period in order to reproduce the effects of cooling and any condensation which may
occur.

6.4.2.3. During each six-hour period, the engine shall be run under the following conditions in turn:

(1) five minutes at idling speed;

(2) one-hour sequence under 1/4 load at 3/4 of rated maximum speed (S);

(3) one-hour sequence under 1/2 load at 3/4 of rated maximum speed (S);

(4) 10-minute sequence under full load at 3/4 of rated maximum speed (S);

(5) 15-minute sequence under 1/2 load at rated maximum speed (S);

(6) 30-minute sequence under 1/4 load at rated maximum speed (S) ;

Total duration of the six sequences: three hours.

Each period must comprise two sets of the six abovementioned sequences.

6.4.2.4. During the test, the silencer must not be cooled by a forced draught simulating normal airflow
around the vehicle. Nevertheless, at the request of the manufacturer, the silencer may be cooled
in order not to exceed the temperature recorded at its inlet when the vehicle is running at
maximum speed.

6.4.3.

Conditioning by pulsation

The exhaust system or components of said system is/are fitted to the vehicle referred to in para-
graph 3.3.3. above or the engine referred to in paragraph 3.3.4. In the former page, the vehicle
must be mounted on a roller dynamometer, and,
in the second case, the engine must be
mounted on a dynamometer. The test apparatus described below is fitted at the outlet of the
silencing system.

6.4.3.1.

Test apparatus

The test apparatus, a detailed diagram of which is shown in Annex 3 to this Regulation must be
fitted at the outlet of the exhaust system. Any other apparatus providing equivalent results is
acceptable.

6.4.3.2.

Test procedure

6.4.3.2.1. The test apparatus shall be adjusted in such a way that the exhaust gas flow is alternately inter-

rupted and re-established by the quick action valve for 2 500 cycles.

6.4.3.2.2. The valve is opened when the exhaust gas pressure, measured at l00 mm at least downstream
from the intake flange, reaches a value between 0,35 and 0,40 bar. It is closed when this pres-
sure does not differ by more than 10 per cent from its stabilised value, measured with the valve
open.

6.4.3.2.3. The time delay switch shall be set for the duration of gas exhaust resulting from the provisions

laid down in paragraph 6.4.2.2. above.

6.4.3.2.4. Engine speed shall be 75 per cent of the speed S at which, according to the manufacturer, the

engine develops maximum power.

6.4.3.2.5. The power indicated by the dynamometer shall be 50 per cent of the full-throttle power

measured at 75 per cent of engine speed (S).

6.4.3.2.6 Any drain holes shall be closed off during the test.

6.4.3.2.7. The entire test must be completed within 48 hours. If necessary, one cooling period will be

observed after each hour.

6.4.3.2.8. After conditioning, the noise level is checked pursuant to paragraph 6.2. above.

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7.

EXTENSION OF APPROVAL

The silencing system manufacturer or his duly accredited representative may ask the administra-
tive department which has granted the approval of the silencing system for one or several types
of vehicles, for an extension of the approval to other types of vehicles. The procedure is that
described in paragraph 3. above.

Notice of the extension of approval (or refusal of extension) shall be communicated to the
Parties to the Agreement which apply this Regulation in accordance with the procedure speci-
fied in paragraph 5.3. above.

8.

8.1.

MODIFICATION OF THE TYPE OF SILENCING SYSTEM

Every modification of the type of replacement silencing system shall be notified to the adminis-
trative department which approved the type of silencing system. The said department may then
either:

8.1.1.

consider that the modifications made are unlikely to have an appreciable adverse effect, or

8.1.2.

require a further test report from the technical service responsible for conducting the tests.

8.2.

9.

9.1.

9.2.

Confirmation or refusal of approval, specifying the alterations, shall be communicated by the
procedure specified in paragraph 5.3. above to the Parties to the Agreement applying this Regu-
lation.

CONFORMITY OF PRODUCTION

Every replacement silencing system or component
thereof bearing an approval mark as
prescribed under this Regulation shall conform to the type of silencing system approved and
satisfy the requirements of paragraph 6 above.

In order to verify conformity as prescribed in paragraph 9.1. above, adequate monitoring of the
production shall be carried out.

9.3.

The holder of the approval shall in particular:

9.3.1.

ensure existence of procedures for the effective control of the quality of products;

9.3.2.

9.3.3.

9.3.4.

9.3.5.

9.3.6.

9.4.

9.4.1.

9.4.2.

have access to the control equipment necessary for checking the conformity of each approved
type;

ensure that data of test results are recorded and that annexed documents shall remain available
for a period to be determined in accordance with the administrative service;

analyze the results of each type of product in order to verify and ensure the stability of the
product characteristics, making allowance for the variation of an industrial production;

ensure that for each type of product at least the tests prescribed in Annex 5, point 2, are carried
out;

ensure that sampling or test pieces giving evidence of non-conformity with the type of test
considered shall give rise to another sampling and another test. All the necessary steps shall be
taken to re-establish the conformity of the corresponding production.

The competent authority which has granted type-approval may at any time verify the confor-
mity control method applicable to each production unit.

At every inspection, the test books and production survey records shall be presented to the
visiting inspector.

The inspector may take samples at random which will be tested in the manufacturer's labora-
tory. The minimum number of samples may be determined according to the results of the
manufacturer's own verification.

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9.4.3.

9.4.4.

9.4.5.

10.

10.1.

10.2.

When the quality level appears unsatisfactory or when it seems necessary to verify the validity
of the tests carried out in application of paragraph 9.4.2. above, the inspector shall select
samples to be sent to the technical service which has conducted the type approval tests.

The competent authority may carry out any test prescribed in this Regulation.

The normal frequency of inspections by the competent authority shall be one every two years. If
unsatisfactory results are recorded during one of these visits, the competent authority shall
ensure that all necessary steps are taken to re-establish the conformity of production as rapidly
as possible.

PENALTIES FOR NON-CONFORMITY OF PRODUCTION

The approval granted in respect of a type of silencing system pursuant to this Regulation may
be withdrawn if the requirements laid down in paragraph 9. above are not complied with, or if
the silencing system or components fail to pass the tests provided for in paragraph 9.2. above.

If a Party to the Agreement which applies this Regulation withdraws an approval
it has
previously granted, it shall forthwith so notify the other Contracting Parties applying this Regu-
lation, by means of a copy of the approval form bearing at the end, in large letters, the signed
and dated annotation ‘APPROVAL WITHDRAWN’.

11.

PRODUCTION DEFINITELY DISCONTINUED

If the holder of the approval completely ceases to manufacture a type of replacement silencing
system or components of the said system in accordance with this Regulation, he shall so inform
the authority which granted the approval. Upon receiving the relevant communication, that
authority shall inform thereof the other Parties to the Agreement applying this Regulation, by
means of a copy of the approval form bearing at the end, in large letters, the signed and dated
annotation: ‘PRODUCTION DISCONTINUED’.

12.

NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR CONDUCTING APPROVAL
TESTS, AND OF ADMINISTRATIVE DEPARTMENTS

The Parties to the Agreement which apply 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 administrative departments which grant approval and to which forms
certifying approval or refusal or withdrawal of approval, issued in other countries, are to be
sent.

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(Maximum format: A 4 (210 × 297 mm))

ANNEX 1

Name of administration

Communication concerning the approval (or extension or refusal or withdrawal of approval or production definitely
discontinued) of a type of replacement silencing system or components of the said system pursuant to Regulation No 59.

Approval No: . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

1. Trade name or mark of the silencing system:

. . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

2. Type of the silencing system: . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

3. Manufacturer's name and address: . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

4.

If applicable, name and address of manufacturer's representative: .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

5. Brief description of the silencing system (with/without (1) fibrous material, etc.):

. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

6. Trade name or mark of the vehicle type for which the silencing system is intended:

. . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

7. Vehicle type, starting from serial number:

. .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

8. Kind of engine: positive-ignition, compression ignition:

. . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

9. Cycles: two-stroke or four-stroke: . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

10. Cylinder capacity: . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

11. Engine power (kW ECE):

. . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

12. Number of gears: . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

13. Gears used: . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

14. Final drive ratio(s): . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

15. Maximum power: . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

16. Load conditions of vehicles during test:

. . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

17. Sound levels: . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

Vehicle in motion: ………… dbA at steady speed before acceleration of ………… km/h

Vehicle stationary: ………… dbA with engine running at ………… r.p.m.

18. Value of the back pressure:

. .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

19. Silencing system submitted:

For approval on . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

For extension of approval on .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . .

20. Technical service responsible for conducting approval tests:

. . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

21. Date of report issued by that service:

. . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

22. Number of report issued by that service: . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

23. Approval granted/refused (1):

. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

24. Position of approval mark on the vehicle:

. .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

25. Place:

.. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

26. Date: . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

27. Signature: . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .

28. The following documents, bearing the approval number shown above, are annexed to this communication:

. . . . . . .. . . . . . . . . .. . . . . . . . .. . . drawings, diagrams and plans of the silencing system

. . . . . . .. . . . . . . . . .. . . . . . . . .. . . photographs of the silencing system

. . . . . . .. . . . . . . . . .. . . . . . . . .. . . list of components, duly identified constituting the silencing system

(1) Strike out whatever does not apply.

24.11.2006

EN

Official Journal of the European Union

L 326/51

ANNEX 2

ARRANGEMENT OF TEE APPROVAL MARK

(see paragraph 5.4. of this Regulation)

The above approval mark affixed to a component of silencing system shows that the replacement silencing system type
concerned has been approved in the Netherlands (E 4) pursuant to Regulation No 59 under approval number 002439.
The first two digits of the approval number indicate that the approval was granted in accordance with the requirements
of Regulation No 59 in its original form.

ANNEX 3

TEST APPARATUS

L

3
2
6
/
5
2

E
N

O

f
f
i
c
i
a
l

J
o
u
r
n
a
l

o
f

t
h
e

E
u
r
o
p
e
a
n
U
n
o
n

i

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

Inlet flange or sleeve — connection to the rear of complete silencing system to be tested.
Regulation valve (hand operated).
Compensating reservoir from 35 to 40 1.
Pressure switch 0,05 to 2,5 bars — to open item 7.
Time delay switch — to close item 7.
Counter of impulses.
Quick response valve — such as the valve of an exhaust brake system of 60 mm in diameter, operated by a pneumatic cylinder with an output of 120 N at 4 bars. The response time, both when opening
and closing, must not exceed 0,5 s.
Exhaust gas evacuation.
Flexible pipe.
Pressure gauge.

.

2
4
1
1
2
0
0
6

.

24.11.2006

EN

Official Journal of the European Union

L 326/53

ANNEX 4

MEASURING POINTS — BACK PRESSURE

Examples of possible measuring points for loss-of-pressure tests. The exact measuring point shall be specified in the test
report. It shall be in an area where gas flow is regular.

Fig. 1

Fig. 2 (1)

Fig. 3

(1) If not possible, refer to figure 3.

L 326/54

EN

Official Journal of the European Union

24.11.2006

ANNEX 5

CHECKS ON CONFORMITY OF PRODUCTION

1. GENERAL

These requirements are consistent with tests to be held to check conformity of production, according to para-
graphs 9.3.5 and 9.4.3. of this Regulation.

2.

TESTING PROCEDURES

The methods of testing, measuring instruments and interpretation of results shall be those described in paragraph 6
above. The exhaust system or component under test shall be subjected to the test as described in paragraphs 6.2.,
6.3. and 6.4. above.

3.

SAMPLING

An exhaust system or component has to be chosen. If after the test of paragraph 4.1. the sample is not considered
to conform to the requirements of this Regulation two more samples have to be tested.

4.

EVALUATION OF THE RESULTS

4.1. If the sound levels of the exhaust system or component tested pursuant to paragraphs 1 and 2, measured in accord-
ance with paragraph 6.2. above, do not exceed by more than 1 dB(A) the level measured during the type-approval
tests of this type of exhaust system or component, the exhaust system or component type shall be considered to
conform to the requirements of this Regulation.

4.2. If the exhaust system or component tested according to paragraph 4.1. does not satisfy the requirements laid down
in that paragraph, two more exhaust systems or components of the same type must be tested pursuant to para-
graphs 1 and 2 above.

4.3. If the sound level of the second and/or third sample of paragraph 4.2. exceeds by more than 1 dB(A) the level
measured during the type-approval tests of this type of exhaust system or component, the exhaust system or
component type shall be considered not to conform to the requirements of this Regulation and the manufacturer
shall take the necessary measures to re-establish the conformity.