CELEX: 51975PC0577
Language: en
Date: 1975-11-17
Title: PROPOSAL FOR A COUNCIL DIRECTIVE on the approximation of the laws of the Member States relatinf to MEASURING SYSTEMS FOR LIQUIDS OTHER THAN WATER (submitted to the Council by the Commission)

ARCHIVES HISTORIQUES
DE LA COMMISSION
COLLECTION RELIEE DES
DOCUMENTS "COM"
COM (75) 577
Vol. 1975/0218
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 ---pagebreak--- CGMrZISSION.OP THEJBURDPEAN COMMUNITIES
                                     COM(75)577 final.
                                     Brussels , 17 November 1975
                      PROPOSAL FOR A COUNCIL DIRECTIVE
          on the approximation of the laws of the Member States
                             relatinf to
              MEASURING SYSTEMS FOR LIQUIDS OTHER PLAIT WATER
                ( submitted to the Council by the Commission)
 ---pagebreak---                                EXPLANATORY MEMORANDUM
This directive has "been drawn up pursuant to Article 100 of the Treaty and
the Council Directive of 26 July 1971 ( l ) on the approximation of the laws
 of the Hember States relating to common provisions for both measuring instru­
ments and methods of metrological control .
The aim is to remove the technical barriers which are currently impeding
intra-Community trade in measuring systems for liquids other than water as
a result of disparities between national laws governing such systems in the
Member States .
A comparative study of the regulations applying to measuring systems for
liquids other than water in the Member States has shown that the differences
are not confined to technical specifications on construction and operation
but also extend to the accuracy and methods with which these systems are
tested before being placed on the market .
Manufacturers wishing to export their systems are therefore obliged to diver­
sify their production to take account of the regulations in force in the
Msmber State where the systems are intended to be used and to undergo repeated
inspections performed according to a variety of methods .
Since present national laws are justified by a legitimate desire to protect
consumers and users , the only way of overcoming the disadvantages stemming
from their divergency and of creating the conditions needed for the establish­
ment of the Common Market seems to be to harmonize those laws .
The expression "measuring systems for liquids other than water" means systems
whereby any liquid product other than water may be measured as it passes through
them .    In addition to one or more meters conforming to Council Directive
K° 71/319/SEC and the ancillary equipment conforming to Council Directive
N° 71/348/EEC which may be associated with them f these systems comprise devices
to ensure correct measurement or to facilitate operation .
                                                                                 •/
{ 1 ) O.J , N° L 202 , 6 September 1971 .
 ---pagebreak--- Measuring systems for liquids other than water are intended, either to
deliver or to receive particular liquids .      These may obviously include
 all hydrocarbons such as domestic fuel oil , other . fuel oil , petrol for
road vehicles , airci-aft and pleasure boats , and also liquid food products
 ( wine , milk , etc .) which are delivered or collected in road tankers .
The importance of such measuring systems for liquids other than water is
evident .    The instruments may be mounted on Worries , or on fixed delivery
equipment (petrol pumps , etc .) or on pipelines .    Kith the aid of those
instruments it is possible to measure liquids other than water fairly
economically , without wasting time and      in the case cf pipelines , without
interrupting the flow of liquid .
This Directive lays down the general provisions for such measuring systems
and the degree of accuracy and the nature of the inspections with which these
systems must comply in order to receive the E3C marks and symbols and thus
circulate freely in the Community .
This proposal for a directive has been drawn up at the request of the Council
which , in its resolution of . 21 December 1973 on industrial policy , invited
the Commission to submit a proposal on the question before 1 January 1975 .
This Directive also constitutes a sequel to a number of Dire',tives adopted
by the Council on measuring instruments ; it etrprlenenta iho
Council Directive of 1971 on meters for liquids other "ohan water (7l/319/^SC )
 ---pagebreak---                                    - 3 -
 The type of harmonization adopted is the optional system , similar to that
 adopted for most of the separate Directives on measuring instruments .
 This means that measuring systems for liquids other than water meeting
 the requirements of this Directive may be marketed and used freely between
 the Member States and inside the Ifember States as may the systems complying
■with national regulations in each of the Member States individually .
 CONSULTATION OF TEE EUROPEAN PARLIAIS3TT AND SCONOrTIC AND SOCIAL COMMITTEE
The opinion of these two bodies is required in accordance with the second
paragraph of Article 100 because the implementation of the provisions of
the .Directive will require the amendment of legislation in certain Member
    9
'States .
 ---pagebreak---                           PROF'OSAL_FOR A vC^Ctt
                    on tin approximation of tlie laws of the I'embor St at e s
                    relating to measuring systems for liquids other than
                                           wat er
 THE COUNCIL OP TEE EUROPEAN COLKUHITISS ,
Having regard to the Treaty establishing the European Economic Community ,
 and in particular Article 100 thereof ;
Having regard to the proposal from the Commission ;
Having regard to the Opinion of the European Parliament ;
Having regard tc the Opinion of the Economic and Social Committee ;
               «
Whereas in each Member State the construction and methods of control of
measuring systems for liquids are subject to mandatory provisions which
differ from one I"e<nber St axe to another and consequently- hinder tr?de in
such systems ; 'whereas it is therefore necessary to approximate these
provisions ;
tfhareas the Council Directive of 2o Ju?.y 1971 ( l ) on the approximation of
the laws of the Member States relating to measuring inutruarantE and methods
of sotrologicsl control ha -.! laid down the EEC pat bom. approval and EEC initial
verification procedure for measuring instruments ;           whereas , in accordance
with ■{; jjj. ^ Directive , the technical requirements for the design and functioning
of measuring systems for liquids other than water should, be laid down ;
Whereas the Council Directive of 26 July 1971 ( 2 ) on the approximation of
the laws of the Il-ember States relating to meters for liquids other than water
and that of 12 October 1971 ( 3 ) on the approximation of the laws of the Member
States relating to ancillary equipment for meters for liquids other than water
have already laid down the technical requirements for design and functioning
which instruments must meet ; and whereas it is specified in the Directive on
meters for liquids other than water that measuring systems including one or
more meters for liquids other than water must be the subject of a separate
Directive ;
\ 1 ) and "( 2) ~ ; O.J. N° L 202, 6 September 1971 , p . 1 and p . 32 .
U)                   ï O.J. N° L 239 » 25 October 1971 , p . 9.
 ---pagebreak--- I
                                       •        C-J.î    .
  H33 ADOOT) THIS DIRECTIVE : _ ,,
                                    Article       1   •-   ■ •
  This Directive applies to measuring systems for liquids other than water
                                                               k
  incorporating volumetric meters with measuring chambers .
                                    Art i c 1 e   2
  Tho S3 measuring systems which may bear EEC marks and symbols are described in the
  Annex hereto®    They shall be subject to EEC 'pattern approval - a^d shall under­
  go EEC initial verification under the conditions laid down in the said Annex *
  Under    the .  conditions-1   . : laid down in the Annex , EEC pattern approval
  may also be granted to \     . -   . components or sub-assemblies' of a measuring
  system .
                                    Article      3
  No Member State may , for reasons connected with their metrological qualities ,
  refuse , prohibit or restrict tho placing on the market or entry into service
  of measuring syst oms for liquids other than water . bearing the EEC pattern
  approval symbol and the ESC initial verification mrk .                      •  •*
                                    Art': c?.e   A
  1»   The Ilember States shall put into foroe the lws , regulations and
       administrative provisions needed in order to - comply with this Directive
       within eighteen months of its notification and shall forthwith inform
       the Commission thereof ,                                           r
  2.   Member States shall coasiunicate to the - Commission the text of the
      provisions' of national law which- they adopt or intend to adopt in-^c
       field covered by this Directive ,,
                                   Article       5
  This Directive is addressed to the Ilember States .
 ---pagebreak---                                            ANNEX
 1.       GENERAL IîSQUIREEtëïTS PC3 ISASUR1IÎG SYSTEMS
          «=ï_=2r • m: . MK : -y     Ajiygrv iviarŒSdaw
 1.1 .    ]>.%finitions
 1.1.1 . Measuring system
         A measuring system for liquids other taaa water comprises , ;.n addition, to
         the meter itself conforming to Council Directive 71/ HS/'SSD and the ancilla­
         ry equipment conforming to Council Directive 7--/34-S/SE0 which may oe asso­
         ciated vitix it , all the equipment to ensure correct measurement oi« intended
         to facilitate the operation and all oth-ar e<ju.ipsaent vjhica can affect measu­
         rement in ery possible way .
         If s-rvferal meters intended for separate measuring operations operate in     ~ -
         conjunction with common components , each meter shall "be cons! dared as
         comprising , with the common components , a measuring system.
         If several meters are intended for a single measuring operation , the meters
         are considered as forming a single ines.sr.ring system.
1.1.2. Minimum dolivery
         The minimum delivery of a measuring system is determined in c&rtor.nity with
         the requiromenn specified in Council Directives 71/31 9./ESC and 7l/348/SIDC
         concerning meters for liquids other than water and- ancillary equipment for ,
         maters for liquids other than water, h. aving regard to the provisions of this
         directive .
         In measuring systems intended to measrro liquid received into the system , .
         the smallest volu&k of liquid for vhich measurement shall "be authorized is
         called minimum reception . The preceding requirement relating to minimum
         delivery applied , by analogy , to minimum recent ion .
1,1.3 . ifaximum rate of flow
         The maximum permissible rate of flow of a measuring system is the maximum
         rate of flow of the cet&r , or , if several meters are connected in parallel ,
         the sum of the maximum .rates of flow of these mexara , except in the case
         where particular conditions imoose a smaller value .
 ---pagebreak---                                                                                           ι
                                                   2 -
1.1 ,> 4 » Gas separator
            A gas separator is an apparatus for continuously separating and removing
            by an appropriate arrangement eny air or gases contained in the liquid.
          . The gas evacuation arrangement is , in principle , automatic in operatior
            However , this requirement is waived if a mechanism is provided which
            mat ically . stops the flow of liquid when air or gas is likely to ente
            meter . In this case , resumption of measurement shall be possible
            when the gas has been removed , either automatically or manually . /
1.1 . 5 . Gas extractor                                                       1
            A gas extractor is an apparatus designed to ertract air <** g£30S iccumular-
            ted in the pipe work upstream of the meter in the form^cf p^kets no more
            than slightly mixed witJrttie liquid,               . - ,
            The above requirements c oncer ring"-the gas evacuation arrangement f°r ^-1-e
            gas separator also apply to that of tha. gas. extractor.
1.1.6 . Special gas extractor
            A special gas extractor is an apparatus which, on the cne hand, like the
            gas separator but under less stringent operating conditions , continuously
            separates sny^air or gases contained in the liquid and on the other hand
            automatically stops the flow of liquid wh^n air cr gases accumulated m
            the form of pocket sno, more than slightly mixed with the liquid are likely
            to enter the meter .
1.1*7 * Condenser tray                               .
                                                       V.
            A condenser tray is a closed tank designed- to collect , -in pressurized
            liquified »as measuring aysteros j the gases contained in the liquid to be
            measured r-v ..d to condense them before measuring^
1.1.8 . Gas indicator
             A gas indicator is an apparatus allowing easy detection of any gaseous
            formation that may be present in the liquid flow.
1.1.9 . Sight–glass                  '                                '
            A sight-glass is a device allowing the level of the liquid to be checked in
             a part of the measuring system.
 ---pagebreak---                                                                 I
                                                 - 3 -
9
     1*2 .     Field of application
               The rcrrui remsnts of this Annex apply to all types of measuring system ,
               provided that the special requirements in tho Annex do not specify
               differout requirements .
     1.3 .     Heters
               Meters incorporated in a measuring system, including any ancillary equip­
               ment f shall be of an EEC pattern approved for measurement of the liquid
               concerned in normal conditions of use .
               These meters shall "be the subject of a separate SSC pattern approval or
               of an approval included in the SEC pattern approval of the measuring
               system in which they are incorporated.
    1.4 .      Point of transfer
    1.4.1 .   Measuring systems shall incorporate a point defining the liquid delivered
               or received and called the point of transfer .   This point of transfer is
               situated downstream of the meter in delivery systems-, upstream of" the
              met or in receiving systems .
    1.4.2.    Measuring sjrstems may - be of two types : "dry hose" systems and "full hose"
              systems ;    the term hose includes rigid pipework.
    1.4.2.1 . Dry hose systems are , in the case of delivery equipment , measuring systems
              in ifhich the point of transfer is situated upstream of a delivery hose .
              This point of transfer takes the fcrm of either a weir type sight glass
              or a closing device , combined, in both cases , with a system which ensures
              the complete emptying of the delivery hose after each measuring operation ,
    1.4.2.2. Full hose measuring systems are , in the case of delivery equipment , measuring
              systems of which the point of transfer comprises a closing device situated
              in the delivery pipework. When the pipework has a free end, the closing
              device shall be situated as close as possible to this end.
  . 1*4* 2.3. In the case of receiving equipment , the same requirements apply , by analogy,
              to the .reception pipework upstream of the meter.
 ---pagebreak---                                                « 4 -
             Measuring systems shall incorporate , upstream of the [meters , a device
             intended to collect, solid impurities from the liquids (filter ).
             Filters shall as far as possible be so arranged as to be accessible .
1« 6 .       Elimination of air or gases
1.6 , 1 „    General requirement
             A measuring system shall be installed in such a way that it does not
             normally produce , upstream of the meter , entry of air nor release of
             gas in the liquid * If there is a risk that this requirement night not
             be met , measuring systems shall incorporate gas eliminating equipment
             permitting the proper elimination of any gases that may be contained in
             the liquid before it passes through the meser .
             The gas eliminating equipment shall be suitable for the supply conditions
             and arranged in such a way that the error due to the influence of the
             gases on the measurement results shall not exceed j
             – 0o5 $ °f the quantity measured for liquids other than potable liquids of
                a viscosity not exceeding 1 mPa.s ;
             – 1 % of the quantity measured for potable liquids and those whose visco­
                 sity exceeds 1 mPa»s .
             However there shall be no need for the error to be less than 1 $ of the
             minimum delivery .                                                       • ■ •
                                                 t
1*6 ., 2»    Pimped flow
1,6.2.1 . Subject to the provisions in 1.6,6c below., when the pressure at the pump
             intake may , even momentarily, fall below atmospheric pressure or the
             vapour pressure of the liquid , a gas separator shall be provided *
1.6 . 2.1.1 . .A gas separator shall be subject to separate EEC pattern approval or to
               approval included in the EEC pattern approval of the measuring system
               of which it forms pari".
1.6 . 2.1 . 2- The gas separator shall in principle be installed downstream of the
               pump . It may ? however , be combined with the pump .
               It shall always be positioned as close as possible to the meter so that
               the pressure drop due to the flow of liquid between the two components is
               negligible .
 ---pagebreak---                                                     - 5 -
1.6 . 2 . 1.3 . The limits of opera-fcion of a gas separator are as follows :
                     a) the maximum rate or rates of flow for one or more specified liquids ;
                    'b ) the maximum and minimum pressure limits compatible with proper
                          functioning of the gas eliminating apparatus .
1.6 . 2 . 1.4 . When a gas separator is covered by a separate ESC pattern approval , it
                  shall , within the limit of errors laid down in 1.6.1 ., ensure the
                  elimination of air or gases mixed with the liquid to be measured , under
                 the following conditions :
                     3,) the measuring system shall operate at the maximum rate of flow and
                         the minimum pressure laid down for the gas separator ;
                   b ) any proportion by volume of gases relative to the mixture of gas
                         and liquid is permissible if the gas separator is designed for a
                         rate of flow lower than or equal to 20 m /h ;   it shall be limited
                         to  30 % i^ the gas separator is designed for a rate of flow higher
                         than 20 m /h. ( Gases shall be measured at atmospheric pressure to
                         determine their percentage) .
               '   *
                            As regards separators designed to operate at a flow rate of more
                         than 100 m /h, however, pattern approvals can be made by analogy
                         with an approved pattern of the same design and smaller dimensions .
1.6.2.1.5 ^,Then a gas seperator is approved as a component included in an approved
                 measuring system , the above requirements may      be applied to it .
               However , when the measuring system incorporates a gas indicator conforming
                to the definition in 1.1.8 ., tho gas separator noed only meet the
                 requirements of 1„6.2»1.4» until gas bubbles are clearly visible in
               the indicator .
              These bubbles need not , however , be present in the case of minute quantities
               of gas and the separator shall operate under the conditions set out in
              1.6.2.1.4 . for any volumetric proportion of gas less than 20 fo .        Experience
               shows that this requirement is generally met by a properly built separator
               if its effective volume is at least equal to 8 % of the volume delivered
              in one minute at the maximum rate of flow indicated on the plate of the
           •  measuring system .
 ---pagebreak---                                                   - 6 -
1.6.2.2 .         When the pressure at the pump inlet is always greater than atmospheric
                  pressure and the vapour pressure of the liquid and there is no gas
                   seperator , a gas extractor or special gas extractor is necesnary if
                   gaseous formations are liable to occur between the pump and the meter
                   during non-flow periods or if air pockets can be introduced into the
                  pipework ( e.g. , when the supply tank is completely empty ).
1.6 . 2 . 2.1 . The gas extractor or special gas extractor shall be subject to ESC
                  pattern approval or approval included in the ESC pattern approval
                   of the measuring system of which it forms part .
1.6 . 2 . 2 . 2 . The gas extractor cr special gas extractor shall in principle be installed
                  downstream of the pump .   However , it may also be combined with the pump .
                  In both cases , it sh-11 normally be installed at the highest point in the
                  pipework , as close as possible to the meter and upstreri;, of it . If it is
                  installed below the level of the meter , a non-return device , fitted if
                  necessary with a pressure limiting valve , shall be incorporated to prevent
                  the emptying of the pipework between it and the meter .
                  If the pipework on the upstream side of the meter incorporates several
                  high points , several gas extractors may be required .
1.6.2 . 2 . 3 . The limits of operation of a gas extractor or special gas extractor are
                  as defined for gas separators in 1.6.2.1.3 .
1.6 . 2 . 2 . 4 . A gas extractor or rpecial gas extractor shall eliminate a gas pocket of
                  a volume at least equal to the minimum delivery without an error greater
                  than 1 Jb of the minimum delivery .
                  They shall also be capable of separating' continuously a volume of gas
                  equal to at least 5 i° of the volume of the liquid delivered at the maximum
                  rate of flow without the error in the measuring system varying by more than
                  0.5 %
1.6.2-3 .         The requirements in 1.6.2.1 . and 1.6 . 2 , 2. shall not prohibit the existence
                  of manual or automatic extraction devices in fixed installations of large
                  dimensions .
1.6.2.4 .         If the supply equipment is arranged in such a way that , whatever the
                  conditions in which it is used , no gas can form in or penetrate into the
                  reception pipework upstream of the meter during measurement no gas
                  elimination device is required provided that the gas formation liable to
                  occur during non-flow periods never causes an error exceeding 1 £ of the
                 minimum delivery .
 ---pagebreak---                            ;
                                       - 7-
 ls6e3o        Ncn–tiiunped flou     , "
 1«6 O 3,1 « ViLen a meter is supplied by gravity, without use of a pump , if
               the pressure of the liquid in all parts of the pipework upstream
               of the meter and in the meter', itself ^is greater* than tho vapour"
               pressure and atmospheric pressure ; it is not necessary to provide
               a gas elininator , Howovor , some arrangement shall , after - the
               measuring systenrhaB boon brought into"" service , ensure its
               remaining correctly filled .
1«C.3»2» If this pressure is likely to be less than atmospheric pressure
              while remaining greater than the vapour pressure , an appropriate
               arrangement shall prevent the introduction of air into the meter .
1«6,,3*3 » In all circumstances the pressure of the liquid between the
              meter and the point of transfer shall be higher than the vapour
              pressure of the liquid .
1.6 . 3. 4 » When a meter is supplied under gas pressure , an appropriate
              arrangement shall prevent the entry of gas into the meter .
    *
1.5.4 .       Gas removal
              Tho gas removal pipe of a gas eliminator shall not include a
              manually controlled valve if the closing of this valve prevents
              the operation of the arrangement . If , however , a closing device
              of this kind is required for reasons of safety , a sealing device
              must ensure that , when open , it remains in this position .
1.6.5 .     " Ant i–swirl device
              If it is in bended as a general rule that the supply, tank of a
              measuring system be completely emptied , the outlet orifice of
             the tank shall be provided with an anti–swirl device , except where
              the system Incorporates a gas separators                  .    .
1*6.6 .      Viscous liquid
             As the effectiveness of gas separators and gas extractors decreases
             with an increase in thy viscosity of the liquid , these components
             should not be fitted in the case of liquids with a dynamic viscosity
             of more than 2QmFa„s at 20°C . The pump shall bo so arranged that
             the inlet pressure is always greater than the atmospheric pressure .
             If this condition is not likely to be fulfilled on all occasions ,
             an arrangement shall be fitted to stop the flow of the liquid
             automatically as soon as the inlet pressure is less than atmospheric
             pressure . A manometer shall be used to monitor this pressure .
             These conditions are not necessary if the measuring system
             incorporates devices ensuring that no air can be introduced through
             the joints in the sections of pipework subjected to reduced
             pressure .
 ---pagebreak---                                    - 3 -
          Vhen the measuring system is not m use , the pipework shall
          be kept full of liquid up to the point defining the quantities
          measured .
1.7 .     Cas indicator
1.7.1 .   Measuring systems may be fitted with a gas indicator . These
          arrangements may- be made obligatory in cases specified- in
          Chapter 2 .
1.7.2 .   The smallest type of gas indicator permissible for use is a
          transparent cylinder with an internal diameter equal to the
          diameter of the meter connecting pipe and' with a length three
          times the internal diameter ; the length need rot , however , be
          more than 15c mm.
          If the internal diameter of the connecting pipe is equal to or
          greater than 80 mm , it shall be regarded as adequate if the
          tube incorporates sufficiently large transparent sections for
          aix" or gas bubbles to be easily observed through them . If this
          is the case , the length of the transparent sections must be at
          least equal to 150 mm .
          The gas indicator must be built and installed in such a way as
          to allow all the liquid through without any being left behind, -
          Vlhen the gas indicator is installed on a by–pass , an instrument
          must be installed on the pipe so that , for all rates of flow
          within the measuring range , it is possible to establish the flow
          of the liquid.
1.7.3 *   The gas indicator shall be downstream of the meter .
1»7*4 «   In dry hose measuring systems the gas indicator may take the
          form of a weir-type sight glass and may also be used as a point
          of transform
1 B 7*5 * The £as indicator may be provided with a bleed screw or some other
          blow-off arrangement vmen it forms a high point in the pipewbrk.
          No pipe shall be connected to the blow-off arrangement . Flow
          indicators ( e.g. spirals or blamed wheels ) may be incorporated
          in the gas indicator , provided that such devices do not prevent
          the observation of ar.y formations of gas which may be contained
          in the liquid . „     .
 ---pagebreak---                                      - 9 -
• 1.8 .   Complete filling of the measuring system
  1.8.1 . The meter and the pipework from the meter to the point of
          transfer shall be automatically kept full of liquid during
          the measuring operation and when the system is not in use .
          If this condition is not fulfilled , particularly in cases
          where the installation is fixed , it must "be possible for
          the complete filling of the measuring system up to the point
          of transfer to be effected manually and monitored during
          measurement and when the system is not being used .
          To ensure the complete elimination of air and gas from the
          measuring system , blow-off arrangement s , if possible with
           small windows , shall be provided at appropriate positions .
  1»8.2. The pipework between the meter and the point of transfer
           shall not ,. in general , induce . errors of more than .1 fo of the
        » minimum delivery .
           Chapter 2 shall specify in some particular cases the technical
           conditions to be fulfilled in order that this requirement can
          be met .
  1.8.3 . Subject to the provisions in 1.6.3.1 ,, 1.6.3.2 . and 1.6.3.3 .,
           a pressure maintaining device shall , if necessary , be placed
           downstream of the meter to ensure that the pressure in the
           gas . eliminators and in the meter is always greater than
           atmospheric pressure and the vapour pressure of the liquid .
  1.8.4 . Measuring systems in which the liquid is likely to flow in the
           direction opposite to that for normal flow when the pump has
          . stopped shall be provided with a non-retum arrangement , fitted
           with a pressure limiting device if necessary .
  1.8.5. In dry-hose measuring systems the pipework downstream from the
            meter and , if necessary , the pipework upstream of the meter
            shall comprise a high point so that all parts of the measuring -
            systems remain constantly filled . Draining of the delivery
            hose referred to in 1.4.2.1 . is assured by an air vent . In
            certain cases this facility may be replaced by special devices
            such' as an auxiliary punp or a compressed-gas injector . In
            measuring systems designed for minimum deliveries of less than
            10 cubic metres , such devices shall operate automatically .
 ---pagebreak---                                    - 10
1.3.6 . In full-hose measuring systems the free end of the hose shall
         incorporate ■ a -device to ensure - that the hose is not emptied
         during periods when the system is not used .
         This specification may not apply to liquefied gas .
        Fhen a closing device is placed downstream of this device ,
        the volume of the space between them shall be as small as
        possible and in any case less than the maximum permissible
         error for the minimum delivery .
         In . this co.se , particularly for systems intended for measuring
        viscous liquids , the end of the nozzle shall be so designed
        that it cannot retain a quantity of liquid exceeding 0.4
         times the maximum permissible error for the minimum delivery
         of the measuring system .
1.8.7 . If the hose comprises several components , these shall be
         assembled either by means of a special connector to keep the
         hose full or by a connection system which is either sealed
         or ensures that the components cannot be separated with a
         commonly used tool .
1.9 .    Variation of internal volume of full hoses
         In the case of full hoses in a measuring system , the increase
         in internal volume due to the change from the coiled position
         when not subjected to pressure to the uncoiled position when
         subjected to the pumping pressure without any flow of liquid
         shall not be more than twice the maximum permissible error
         for the minimum delivery .
         If the measuring system is not provided with a hose stowage
         drum , the internal volume increase shall not exceed the
         maximal permissible error for the minimum delivery .
1.10 .   Branches
1.10.1 . In moasuring systems which are intended to deliver liquids ,
         branches downstream of the meter are permitted only if they
         are so arranged as to ensure that the liquid is only discharged
         from one outlet at a time . ' In measuring systems which are to
         receive liquids , branches upstream of the meter are permitted
         only if they are so arranged that the intake of liquid i3
         effected only through one pipe at a time .
 ---pagebreak---                                - 11 -
         Departures from these requirements can only be approved m
         the case of delivery systems which are installed so that they
         cannot supply more than one user at a time and receiving
         systems which cannot operate for more than one supplier at
  ■      at ime .
1.10.2 . In measuring systems operating either with a dry hose or a full
         hose and having flexible pipes , a non-return valve shall be
         incorporated in the rigid pipework leading to the full hose
         immediately downstream from the selector valve . In addition
         the selector valve shall not in any position permit connection
         of the discharge hose operating as a dry hose with the pipework
         leading to the full hose .       ,     .
1.11 .   By-T>asses
         Any connections intended for by-passing the meter shall be
         closed by means of blanking flanges . However , if the operating
         requirements make such a by-pass necessary , it shall be closed
         either by means of a closing disc or by means of a double
         closing arrangement with a monitoring cock in between .
         Closure shall be capable of being ensured by means of stamped ■
         seals .
1.12 .   Valves and control arrangement s
1.12.1 . If the supply conditions are liable to overload the meter, a
         flow-limiting device shall be provided. This arrangement
         shall be placed downstream of the meter if it causes a
         pressure loss . It shall be capable of being sealed .
1.12.2 . The various positions for the operating components of multi-way
         valves shall be easily visible and located by notches , stops or
         other secure arrangements . Departures from this requirement
         are acceptable whenever the adjacent positions of the operating
         handle form an angle of at least 90° •
1.12.3 . Retaining valves and closing arrangements not used to define
         the quantity measured may have relief valves in order to
         dissipate any abnormally high pressures which may arise in
         the measuring system.
 ---pagebreak---                                - 12 -
1.13 .   layout of measuring systems
         Heasuring. systems shall be installed in sucxi a maimer that
         the indicating device is clearly visible in normal conditions
         of use . If present , the gas indicator and the sight-glass
         of the gas separator shall as far as possible be observable
         from one position . Sealing devices shall be easily accessible ,
         plates shall be fixed irremovably and the statutory markings
         shall be very legible and indelible .
1.14 .   On-site verification devices
1.14.1 . The installation shall permit the performance of on-site testing
         of the various components ?nd verification of the entire system
         in normal operating conditions . If necessary , pipework shall
         be provided to return the measured liquid to a storage tank .
         The installation shall , as necessary , be equipped with
         temperature and pressure tappings , especially when the operation
         or testing of the measuring systems requires a , knowledge of
         these factors .
1.1 5 »  Characteristics of a measuring system
         The characteristics of a measuring system are as follows :
         - maximum rate of flow ;
         - minimum rate of flow ;
         - maximum opérât ing pressure ;
         - minimum operating pressure ;
         - description of the liquid or liquids to be measures ;
         - minimum delivery .
1.16 .    Legends
1.16.1 . A measuring system , component or sub-assembly having received
          pattern approval shall carry a special plate giving the
          following information :
 ---pagebreak---                                - 13 -
          a) the EEC pattern approval symbol ;
          b) the identification mark or name of the manufacturer;
          c) the description chosen by the manufacturer, if any;
          d) the serial number and year of manufacture ;
          e) the characteristics of the model .
         If several meters operate . in a single system with the use of
         common components , the legends required for each part of the
         system may be combined on a single plate .
         The legends on the dial of the indicating mechanism of the
         meter forming part of the measuring system must not contradict
         those on the rating plate of the measuring system .
                                                                      /
1.16.2 . The indications , legends or diagrams required by the directives
         concerning the measurement of liquids other than water (*)
     à   or by the pattern approval certificate shall be marked very
         visibly either on the dial of the indicating mechanism or
         very close to it .
1.17 .   Placing of seals and verification marks
         Sealing devices shall be constructed so as to allow the
         application by stamping of the EEC initial verification marks .
         Sealing devices requiring the use of sealing pincers shall
         be pwrmitted only on instruments that are too fragile to allow
         the marks to be applied by stamping. In all cases , the
         sealing devices shall be easily accessible .
         The stamp -date referred to in 3.3.2.1 . of Jinnex II of the
         Council Directive 7l/3l6/EEC of 26 July 1971 shall be sealed
         to a support of the measuring system.
         It may be combined with the rating plate of the measuring
         system referred to in 1.16 ,   In order to allow dismantling -
         for cleaning purposes , the seals shall not be applied v;hen
         the measuring sj^stem is used for pctable liquids .
         T*j Directives 7l/3l9/EEC -and 71/348/EEC and this Directive .
 ---pagebreak---                      - 14 -
Access to parts which allow the measuring result to be
modified and dismantling of the various component
instruments of the measuring system shall be prevented
by means of sealing devices .
However , sealing devices need not be installed on
connections made in such a wsy that it is virtually ,
impossible to dismantle them with a commonly used tool .
Furthermore , exceptions may be provided for in the
certificate of approval for measuring systems which
need to be dismantled in the course of use (measuring
systems for potable liquids , for example ).
 ---pagebreak---                                         - 15 -
2.      PROVISIONS SPECIFIC TO DIFFERENT TYPES OF MEASURING SYSTEMS
2,1 .   Liquid fuel measuring system (*)
2.1.1 . Liquid fuel measuring systems are measuring systems intended for the
        delivery of liquid fuel into the fuel tanks of road vehicles .
        These measuring systems may be used for refuelling pleasure boats
        and small aircraft with liquid fuel .
        They may include their own. supply arrangement or "be designed for
        installation in a central supply system.
2.1.2 . When the measuring system comprises its own supply arrangement , a gas
         separator shall be placed immediately upstream of the meter inlet .
        This gas sepamter shall meet the requirements set out in 1.5 . 2.1.4 *
        or in 1.6.2.1.5 * In the latter case , experience shows that the
        requirement is generally met if the effective volume of the separator
        is at least equal to 5 7^ of the volume supplied in one minute at
        the maximum rate of flow indicated on the meter plate .
2.1.3 . When the measuring system is designed for installation in a central
         supply system , the general rules in 1.6 . shall be applied.
2.1.4 * These measuring systems shall incorporate a device for resetting
         to zero the volume indicator conforming to items         1.1 ., 1.2 ., 1.3 .
         and 1.5 * of "the Annex to Council Directive 71/ 31-8/EEC , as well r,B a
         volume totalizer .
         If these systems also incorporate a price indicator , this shall be
         fitted with a device for resetting it to zero , as well as & price
         totalizer .
         Devices for resetting the price indicator and volume indicator to
         zero shall be incorporated in such a way that the resetting of either
         of these indicators to zero automatically causes the resetting of
         the other to zero .
 (*)   Measuring systems incorporating : - motor fuel blending meters .
                                           - motor fuel and lubricant blending meters
                                           - electric ., end electronic indicators and
            1                                    ancillary devices ;
                                           - self-service devices :
                                           - measuring systems intended for the
                                                 supply of liquefied gas ,
       are not included under this heading .
 ---pagebreak---                                        - 16 -
2.1.5 .  Hhen the road fuel measuring system comprises its own supply
         arrangement operated by an electric motor , a mechanism shall ,
         after the motor has been stopped , prevent any further delivery
         of the liquid until the indicator has beer} returned to zero .
         Under no circumstances may resetting to zero be possible .during
         delivery .
         In measuring systems supplied by a central system the preceding
         requirement shall be met by means of an automatic closing mechanism .
2.1.6 .  The non-return device referred to in 1.8.4 . shall bo obligatory.
         It shall be placed between the gas eliminator and the meter .
         However it may be placed immediately after the meter if the gas
         eliminator is installed above the meter . In this case , it may be
         combined with the device provided for in 1.8.3 . VThen the non-return
         device is placed betireen the gas eliminator and the meter , the
         resulting pressure loss must be negligible .
2.1.7 .  Hoses shall incorporate a manual closing mechanism which meets the
         requirements of 1.8.6 .  i\n automatic closing mechanics may
         also be incorporated .
         In full-hose measuring systems which are supplied solely by means
         of a hand-operated pump , only the closing mechanism referred to in
         1.8.6 . is required .
2.1.8 .  The liquid fuel measuring systems defined in 2.1.1 . above
         shall be subject to pattorn approval .
         When such systems are intended for installation in a central supply
         system , pattern approval shall be supplemented by one or more
         typical drawings showing the installation conditions at the point
         of use .
2.1.9 .  Measuring systems with a maximum flow rate (Qmax ) equal to or less
         than 100 l/min must have a minimum delivery not exceeding 5 1 «
2.1.10 . Initial verification
         In accordance with 3.2 «, initial verification of liquid fuel
         measuring systems shall be carried out in one or two stages depending
         on whether or not they have their own supply system .
 ---pagebreak---                                     - 17 -
2 . 2.  Measuring systems fit-feed to road tankers for the transport arid
        delivery of liquids with low viscosity and low vapour pros sure
        ( except potable liquids )
2.2.1 . The following provisions shall apply to measuring systems fitted
        to road tankers or transportable tanks .
2.2.2 . Tanks fitted with a measuring system may incorporate one or more
        compartments .
2.2.3 . Where a tank incorporates more than one compartment , each compartment
        shall have its own lock (manual or automatic ).
2.2.4 » In accordance with national rules on use , if any , each measuring
        system shall be used for a specified product or for a class of
        products for which the meter has received the EEC initial verification
        marks .
        The pipework shall be so designed that the mixing of products in
        the measuring system is easily prevented .
2.2.5 * Where tanks are fitted to trailers or somi-trailers , the measuring
        systems may be affixed either to the tractor or to the trailer or
        semi-trailer .
2.2.6 . A measuring system fitted to a road tanker may be of the dry-hose
        or full-nose type . It may also have either one dry hose and one
        full hose or two full hoses of different dimensions arranged so as
        to operate alternately .
        In the latter case , change-over shall not be possible during delivery .
        To this end , change-over may be coupled with the resetting to zero
        of the volume indicator .
2.2.7 « Where the meter is fitted with a ticket-printer , the printing of the
        ticket shall be coupled with the resetting to zero of the volume
        indicator .
2.2.8 . A measuring system fitted to a road tanker may be designed to
        operate solely by pump , solely by gravity , either by pump or by
        gravity , or by gas pressure .
 ---pagebreak---                                          - 18 -
2.2.8.1 .   Measuring systems supplied solely "by pump may operate as full-hose
            or as dry-hose systems .
2.2.8.1.1 . If there is a risk that the condition in 1.6 . 2 . 4 » may not be met ,
            the meter shall be preceded by a gas eliminator such as :
              a) a suitable gas separator;
             b ) a gas extractor;
              c ) a special gas extractor.
            When the meter outlet pressure in the measuring system may be lower
            than atmospheric pressure but higher than the vapour pressure of
            the liquid measured , these devices shall be combined with sin automatic
            system to slow down and stop the flow to prevent any air passing into
            the meter .
            When , on the other hand , there is no risk that the meter outlet
            pressure may be lower than atmospheric pressure (which is the case ,
            in particular , in systems operating only on full-hose ) the use of
            automatic mechanisms to slow down and stop the flow is not obligatory .
2.2.8.1.2. If the separator conforms to the requirements of 1„6.2#1.5 «»
            the effective volume of the gas separator shall be equal to at least
            5 Jo of the volume delivered in one minute at the maximum rate of
            flow of the measuring system .
2.2.8.1.3 The special gas extractor with an automatic stop device shall be
            fitted with a sight-glass conforming with 1.1,9 *
            Experience shows that in this case the gas indicator provided
            for in 1»1.8. is not necessary . .
2.2.8.1.4 . The compartments in road tankers shall be fitted with en anti-swirl
            device , except when the measuring system has a gas separator
            conforming to the requirements of 1.6 . 2*1.4 .
2.2.8.1.5 . VJhere a measuring system is fitted to a tank of the calibrated-
            container type , this tank may cease to be considered as a calibrated
            container .
            For a tank to continue to be regarded as a calibrated container ,
            the pipework must be organized in such a way that the requirements
            concerning calibrated containers continue to be met and fraudulent
            manipulation of the installation is precluded . If the installation
             incorporates a pump and the pump is arranged so as to allow direct
             delivery from a full compartment without use cf the meter , that
            pump must be installed so that it empties wholly by gravity .
 ---pagebreak--- 2.2.8.2.            Ileasuring systems op orating solely "by gravity shall meet the
                    following requirements :
2 . 2.8 . 2 . 1 . The equipment must "be so designed that the total content of the
                    compartment or compartments can be measured at a rate of flow
                    greater than or equal to the minimum rate cf flow through the
                    measuring system.
2 . 2 . 8 . 2 . 2 . If there are links with the gas phase in the tank , appropriate
                    devices shall prevent any gas from entering, the meter . • .
2.2.8 . 2 . 3 . The compartments of the tank shall be fitted with an anti-swirl
                    device .             '                          ..
2,2. o. 2. 4 . The provisions of 1.6 # 3.1.» 1.6.3»2 . and l»6 e 3»3 . shall
                    apply . .An accelerating pump may be used dcwnstre&in of the point
                 • of transfer if the foregoing conditions are satisfied. Such a
                    pump shall not have the effect of increasing the rate of flow
                    at the meter .
2.2.8.2.5*In some measuring systems , particularly those having a special gas
                    extractor with an automatic - stop device and those having a means
                    of permmont venting to the atmosphere immediately downstream of the
                    point of transfer , a gas indicator shall not be required .
                ■ On the other hand , in measuring systems' with a manual release into
                  ' the atmosphere - immediately downstream o.f the point of transfer , a
                    gas indicator shall be obligatory.         •  •
2.2.8.3 .           Measuring systems which can operate either by pump or by gravity
                    shall satisfy the requirements laid down in 2 . 2.8,1 , and
                    2.2.3.2 .
2.2.0.4 .           Measuring systems fed by means of gas pressure may operate as
                    dry-hose or as full-hose systems . The pipework linking the device
                    referred to iri' 1.6.3.4# ( l ) above with the meter shall not
         ' '■       incorporate any constriction or component likely- to cause a pressure
                    loss generating gas formation by releasing the gas dissolved in the
                    liquid .
                    Such systems shall incorporate a gauge showing the pressure inside the
                    tank.' The dial of this pressure shall indicate the zone of permissible
                    pressures .            * : •
                    i,l ) Arrangement to prevent gas entering tHe meter ,
                          as specified in 1.6.3.4 .
 ---pagebreak---                                              «.     -
- .2«3 » _       r!eocpti^n mgr^rinp rystems for the unloading of ships , tank wvfons
                 and road tin kern :
   2.3.1 .       Heasuring systems designed to measure liquids unloaded from tinker
                 ships , tank wagons and road bankers shall incorporate an intermediate
                 tank in which the level of the liquid determines the point of transfer .
                 This intermediate tank may bo fitted with gas ilLimination equipement .
   2.3»l»l.In the case of road tankers and tank wagons , the intermediate tank
                 shall automatically maintain a constant level which is visible or
                 otherwise detectable at the « Tart and on completion of the measuring
                 operation . The permissible variations in the constant level shall
                 correspond to a volume equal to no more than the maximum permissible '
                 error for the minimum reception .
   2 . 3 . 1.2 . In the case of tanker ships provision for automatic maintenance of
                 a constant level is not necessary ; in that case , variations in the
                 content shall be measurable .
                 If the tanker ship is emptied with the aid of pumps located in the
                 bottom of the ship , the intermediate tank need only be used at the
                 beginning and end of reception .
   2 . 3 . 1.3 . In the two latter cases , the cross-section of the intermediate tank
                 shall be such tluvt a quantity equal to the maximum permissible
                 error for the minimum reception corresponds to a difference in
                 level of at least 2 mm .
   2.4 »         Pressurized liquefied gas measuring systems , whether stationary or
                 fitted to road tankers           ■
   2.4.1 .       There shall bo a permanent link along rigid pipework between these
                 measuring systems and their feed tanks . A ncn-roturn valve sl.all
                bo fitted between the feel tuiks and the meter .
   2.4.2 .       A pressure maintenanc-e device located downstream of the motor "shall
                 ensure that the product is in a liquid state inside the meter during
                the measuring process . The required pressure may be maintained
                 either at a fixed value or at a value adjusted to suit measurement
                 conditions .
 ---pagebreak---                                        - 21 -
                                 *• ^    ..
2.4.2.1 . Where the pressure is maintained at a fixed value , the latter
           shall "be at least equal to the vapour pressure of the product
           at a temperature 15° C higher than tho highest possible in-service
           temperature . The setting of a pressure-maintenance device shall
           be sealable .      -
2.4.2.2 . Where the pressure is adjusted to suit measurement conditions , it
           shall exceed the vapour pressure of the liquid by a least one bar
           during measurement . This function shall be automatic .
2.4.2.3 . In the case of stationary measuring systems for industrial use ,
           tho competent Kotrology Service may authorize the use of manually
           adjustable pressure-maintenance devices , in which case the pressure
           at the meter outlet shall not be less than the vapour pressure of
           the product at a temperature 15° C above the temperature of the
           liquid during measurement . A diagram should be affixed to the
           measuring system to show the vapour pressure of the product measured
         ■ as a function of its temperature . If it is anticipated that these
           measuring systems may have to operate unsupervised for long periods ,
           the temperature and pressure shall be registered continuously by
           recording equipment . '
         6
2.4.3 .    Upstream of the meter there shall be a gas-elimination device
           consisting of either a gas separator or a condenser tray .
2.4.3.1 . The gas separator shall satisfy the general requirements laid
           down in section lfor either the liquefied gas itself or a liquid
           cf greater visoosity . .-
           Eowever , because of verification difficulties , it is permissible
           for a gas separator . to be approved if its .effective volume is not
           less than 1.5 ^ of the volume delivered in one. minute at maximum
           rate of flov; in cases where the pipe connecting the meter to the
           storage tank is not longer than. 25 m . "hen it exceeds 25 m in
           length , the effective volume of the gas separator shall be not
           less than 3 % of the volume delivered in one minute at maximum
           rate of flow .
           It is not necessary to fit either a gas indicator or a sight-glass
           to liquefied gas measuring systems *
           The gas evacuation duct may be , connected to the space containing
           the , gas phase iu the. feed tank or to a self-*containod pressure-
           maintenance device set at a pressure 0.5 to i bar below tho
        * pressure at the meter outlet . This duct may incorporate a shut-off
           valve , but it must not be possible to close this valve during the
           measuring process . -
 ---pagebreak--- 2.4.3.'2, The volume of the condenser tr?;y shall . depend on the volumeof the
          pipework between the feed–tank valve and the pressure-maintenance
          valve downstream of the meter .    It shall not be less than twice
          the reduction in volume of the liquid liable to occur if the
          temperature drops by a value conventionally fixed at 10° C for
          pipe work exposed to the atmosphere and 2° C for buried or theijnally
          insulated pipework .  To calculate the contraction , the coefficient
          of thermal expansion shall be rounded off to 3.1Cf~ per decree
          Celsius for propane and propylene and tc 2. 10"-* per decree Celsius
          for butane aaid butadiene . For other, produuxs with a high vapour
          pressure , the values of . the coefficient to be adopted shall be
          fixed by the competent Metrology Service .
          The condenser tray shall be fitted with a manually operated blow-
          off arrangement .
          In a measuring system , the condenser tray shall be located at the
          highest point in the pipework .
          The volume calculated by the foregoing method may be spread over
          several condenser trays located at the highest points in the
          pipework .
2.4.4*    A thermowell shall be provided in the immediate vicinity of the
          meter .
          The user shall be in possession of a verified thermometer graduated
          at intervals not exceeding 0.5° C.
          A pressure gauge shall be fitted between the meter and the pressure-
          maintenance valve .
          For measuring systems incorporated in : road tanker3»a pressure gauge
          sociket will be regarded as adequate .          . .
2.4.5 .   During measurement , there shall be no connection between the gas
          phases in the storage tank and the reception tank .
2.4 « 6 . Safety valves may be incorporated into measuring systems for the
          purpose of preventing abnormally high pressure . T " these valves
          are located downstream of the meter , they shall . -open into the
          atmosphere or be connected to the reception tank .
          Under no circumstances shall the safety valves located upstream
          of the meter be connected by piping which by-pass js the meter to
          the valves located downstream .
 ---pagebreak---                                   ~ 23
2.4.7 . Where operating conditions necessitate the use of detachable
         hoses , these hoses shall remain full if their volume is greater
         than the maximum permissible error 'for the minimum delivery .
         Detachable full hoses shall be equipped with special " coupler"
         connections for full hoses . Manually operated blow-off
         arrangements shall be provided , if necessary, at the ends of
         these hoses .
2.4.8. The monitoring cock of the double closing arrangement specified
          in 1,12 for sny pipework by-passing the meter must be
         capable of being shut off for safety reasons . In such cases ,
         leaktightness shall be monitored by a pressure gauge fitted
         between the two shut-off valves or by any other equivalent
         system.                        .     ...    ... -
2«5 »    Measuring systems fitted to pipelines
2.5.1 . The measuring systems referred to are those fitted on either
         piping connecting two stationary tanks or piping leading to or
         from a pipeline or depot ,                        .         . >
2.5.2. If several pumps are mounted in series in a pumping station ,
         an automatic locking mechanism shall ensure that the pumps are
         sot in operation in the correct order, if necessary, this
         mechanism shall be sealable .
2.5»3 « An appropriate device shall prevent the liquid' flowing against
         the normal direction of flow.
'2.5.4 .   If safety valves are fitted .on the pipework upstream and downstream
         of the meter , the- discharge pipes from the valves located upstream
         of the meter shall not lead to the same tank as those from the
         valves downstream of the meter .               •     • , .
2.5.5. Heters fitted to pipelines to measure in succession liquids of
         different natures must , if possible , be equipped with automatic
         correcting device to ensure that the requirements of item 6.2 .
         of Council Directive N° 71/319/EEC on meters for liquids other
         than water are satisfied.     These correcting devices shall be
         subject to pattern approval .
 ---pagebreak---                                          - 24-
                However , if the . measurement results are used solely for
                commercial operations or for fiscal operations concerning a
                limited number of persons or bodies designated in contracts ,
                pipeline operators may be authorized to measure in succession
                liquids of different natures using the same meter , even if tho
                variations in tho error due to the variations in the properties
                of the liquids are such that the requirements of item 6,2.
                of the abovementioned Directive N° 71/319/ESC cannot be satisfied .
                In this case , the user shall correct the measurement rosults by
                applying the correction coefficients laid down for various
                viscosity zones xd-thin which the provisions specified above must
              - be complied with .
2.6 .           Measuring systems for milk
2.6.1 .         The following requirements apply to portable measuring systems
                used for the reception of milk by collecting tankers , to fixed
                measuring systems used for receptionln dairies and to portable
                or fixed measuring systems used for the delivery of milk .
2.6.2.          In reception equipment , the point of transfer consists of a
                constant level in a tank located upstream from the meter.'
                This constant level must be visible before and after each
                measuring operations     It must be automatically re-established .
2.6.2.1 . . When the meter is supplied by a pump , the constant-level tank
                may be placed before the pump or between the pump and the meter .
2.6 . 2 . 1.1 . In the first case the tank may itself be supplied by gravity ,
                by the emptying of churns , with the aid .of an auxiliary pump
                or a vacuum system.                     .
                If the milk is deliverod into the tank with the aid of a pump
                or a vacuum gystem ,.- a gas jeliminator is necessary ; this eliminator
           . , may be combined with the constant-level tank. •
2.6.2*-l«2.In the second casef the constant-level tank must act as a gas
                eliminator .
 ---pagebreak---                                           25 -
2.6.2.2. Notwithstanding tho provisioned of I.8»3.»"tho raotor nay
             be supplied- by' a vacuum- •eyatemv"- -In - tiiis - case ," since the pressure
             inside the pipework between the const ,?jat~level tank and the meter
             is lower than atmospheric pressure , the pipework connections must
             be perfectly leaktight . It must bo possible to . verify . this
             leaktightness .
2.6.2.3 . In all cases of reception , the pipework upstream of the constant-
             level must be completely emptied by an automatic mechanism in
         \
             usual operating conditions ..
2.6.2.4 . The constant level shall be monitored by means of a sight-glass
             or level indicator. The' level will be regarded as constant when
             it settles within a zone lying between two. lines corresponding
             to a difference in volume of not more than twice the maximum
             permissible error on minimum delivery *            The distance between the
             two lines must be at least 20 mm,
2.5. 2« 5»        "to meet the aforementioned requirement , decelerating mechanisms
             are incorporated in the measuring system, the rate of flow during
          . the decelerating period must not descend below the minimum flow ^
             rate of the meter .
2.5*2.6 . If , jin reception equipment in dairies , the liquid measured is
             conveyed at a level lower than that of the meter , an automatic
             mechanism shall ensure a pressure higher than , atmospheric
             pressure at the meter outlet .
2.6.3 .      Measuring systems used for the delivery of milk must meet the
             requirements of section 1 .                      1
2.6.4 .      Notwithstanding    the general provisions of section 1 on the
             elimination of air or gas , gas elimination mechanisms must meet
             the requirements of 1,6.1 , solely in operating conditions ,
             i.e. when air enters at the beginning and end of each measuring
             operation ,                                                       . .
             For reception equipment , the user must be able to ascertain the
             leaktightness of the connections so that no air i; s admitted
             upstream of the meter during measuring . For delivery equipment ,
             the system must be assembled so that the liquid pressure is
           : alwr.ys positive in the connecting pipes running from the supply
             tank .                                                  ;:
 ---pagebreak---                                          - 26 -
3.         EEC PATTERN APPROVAL AND EEC INITIAL VERIFICATI Gii
3.1 ,    ' aEC pattern approval
3.1.1 »    ESC Pattern approval shall relate either to a measuring system
           capaole of being transported to the installation site without-
           prior dismantling or to a component , approval of which is laid
           down by a directive ( meter, ancillary equipment , gas eliminator ) ,
           or to a sub-assembly that can bo transported without dismantling
           consisting of one or more components , pattern approval of which
           is laid down in a directive .
           For the measuring systems referred to in the above paragraph , EEC
           pattern approval may be based on plans indicating the characteristics
           of the various components and their relative positions .
3.1.2 .    Tests to be carried, out
3.1.2.1 . The EEC pattern approval examination shall include inspection of the
           piping diagrams and drawings of the measuring system.
                                                               « .. .   0 %   *
           In addition , tests shall be carried out m accordance with the
           following specifications .
           In the execution of these tests , the work standards and their use
           shall be determined in such a way that the measuring inaccuracy of
           the calibration method does not exceed one-fifth of the maximum
           permissible error for the instrument tested .
3.1.2.2 . ïleter test
           It is first necessary to determine the curve of errors as a function
 (    '    of rate of flow , using a sufficiently large number of measuring
           points in the flow zone . It is necessary to verify in particular
           the width of the range of errors of the 'meter in the zone ;
           the position of the error curve in relation to the zero line is of
           lesser importance .
           It may also bo necessary to carry out tests outside the flow zone ,
           especially for meters and measuring systems for low viscosity liquids
           ( dynamic viscosity not over 17 cP).
           Tests must also be carried out at the limits of operating conditions ,
           i.e. , for the maximum and minimum temperatures and viscosities
           specified and for minimum delivery .
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                In all cases , the test volume shall be selected so as to be large
                enough to ensure that the value of the scale of the indicator is
                never greater than one-third of the maximum permissible error .
3.1.2.3 .       Test of air or gas elimination .
                Where there are gas separators and special gas extractors , continuous
                elimination shall be checked by comparison of the measurement results
                of a suitable volumetric meter inserted downstream of the separator
                 ( special extractor) with or without the addition of air or gas .
                For special extractors , it is also necessary to test complete
                emptying of the tank. If possible , the tesl£ should be carried out
                with the least favourable liquid . In tests on mock-ups or models
                on a different scale from the actual equipment , account shall be
                taken of the laws of similarity concerning viscosity (Reynolds ),
                gravity ( Froude ) and surface tension (Weber) . As a general mile
                tests on models shall be used only for applications where they are
                justified .
3.1.2.4 .*      Tests on special measuring systems
3.1 . 2 . 4.1 . Li quid fuel measuring systems
                The tests shall comprise :
                   a) checking of the meter , including determination of the influence
                       of ancillary equipment (price indicator , printer , presetting
                       device , etc ..);
                  b ) checking of the gas eliminator;
                   c ) checking of the constancy of the hose volume ;
                   d) a special check to verify regular advance of the price indicator
                       ( irregular advance may be induced in the first component of the
                       price indicator by sudden closing of the delivery valve ) .
3.1.2. 4*2 . Liquefied gas measuring systems
                Tho examination shall comprise :
                   a) verification on drawings of gas separators as regards area of
                       efficiency and mounting ;
                   b) an operating test on the gas eliminator ( level regulator)
                       incorporated in the gas separator .
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                  The pressurizing device shall also be verified on the drawing.
                  A model test may possibly be required in special cases by the
                  inspection authority .
3.2 .             SEC initial verification
3.2.1 .           General
3.2.1.1 .         ESC initial verification is compulsory for the measuring systems
                  referred to in  3.1.1 .
                  It is also compulsory for meters , whether alone or accompanied
                 by items of ancillary equipment , and for sub-assemblies incorporating
                  a meter when such equipment is mounted in measuring: systems constructed
                  outside the factory where they were manufactured .
3.2.1.2 .         E2C initial verification of a measuring system may be carried out
                  in one or two stages .
3 . 2.1 . 2.1 . It is carried out in one stage when the system is entirely manufactured
                  by a single manufacturer , when it can bo transported without being
                  dismantled and when it is verified under the conditions in which it
                  is intended to be operated .
3 . 2.1 . 2 . 2 . It is carried out in two stages in all other cases .
                  The first stage concerns the meter only or the meter fitted with any
                  ancillary equipment which must be associated with it , whether or not
                  incorporated in a sub-assembly .
                  The second stage concerns the measuring system in the actual operating
                  st at e .
                  It is carried out in a place selected by the Iletrology Service
                  concerned when the measuring system can be transported without being
                  dismantled and the tests can bo carried out under the conditions in
                  which the measuring system is intended to be operated .
                  If these two conditions are not met , the second stage is carried out
                  at the place of installation under operating conditions .
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3.2.2 .      Tests to be carried out
3.2 . 2. 1 « Mien the tests are carried out in two stages :
             The first stage consists of :
             - an external examination of the Volumetric meter , including any-
               ancillary equipment ( conformity with the respective patterns );
             - a metrological examination of the volumetric meter , including
               built-in ancillary equipment .
             The second stage consists of :
             - an external examination of the measuring system including the
               volumetric meter and ancillary equipment ;
             - a metrological examination of the volumetric meter and ancillary
               equipment in the measuring system ;
             - an operating test on the gas eliminator , if there is one ;
             - inspection of the adjustment of the required pressure-maintenance
               devices ;
             - verification of variations in the internal volume of hoses in
               full-hose systems ;
             - determination of residual quantities in empty-hose systems .
3.2.2.2.     When EEC initial verification is carried out in one stage , the tests
             referred to in 3.2.2.1 . must be performed.
3.2.2.3 .    The first-stage tests may be carried out on a test bench (possibly
             in the manufacturer 's factory) or on the installed measuring system.
             The metrological examinations may then be carried out with liquids
             other than those for which the syEtem is intended .
             The second-stage tests must be carried out on the measuring system
             in the place of installation and with the liquid that the system is
             intended to measure .