ARCHIVESHISTORIQUES
DELACOMMISSION
COLLECTION RELIEEDES
DOCUMENTS "COM"
COM(75)577
Vol.1975/0218

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CGMrZISSION.OP THEJBURDPEAN COMMUNITIES
COM(75)577 final .
Brussels ,17November 1975
PROPOSAL FOR ACOUNCIL DIRECTIVE
ontheapproximation ofthelaws oftheMember States
relatinf to
MEASURING SYSTEMS FOR LIQUIDS OTHER PLAIT WATER
(submitted totheCouncil bytheCommission )

EXPLANATORY MEMORANDUM
Thisdirectivehas"beendrawnuppursuanttoArticle100oftheTreatyand
theCouncilDirectiveof26July1971(l)ontheapproximation ofthelaws
oftheHemberStatesrelatingtocommonprovisionsforbothmeasuringinstru­
mentsandmethodsofmetrological control.
Theaimistoremovethetechnicalbarrierswhicharecurrentlyimpeding
intra-Community tradeinmeasuringsystemsforliquidsotherthanwateras
aresultofdisparitiesbetweennationallawsgoverningsuchsystemsinthe
MemberStates.
Acomparativestudyoftheregulationsapplyingtomeasuringsystemsfor
liquidsotherthanwaterintheMemberStateshasshownthatthedifferences
arenotconfinedtotechnicalspecifications onconstruction andoperation
butalsoextendtotheaccuracyandmethodswithwhichthesesystemsare
testedbeforebeingplacedonthemarket.
Manufacturers wishingtoexporttheirsystemsarethereforeobligedtodiver­
sifytheirproductiontotakeaccountoftheregulationsinforceinthe
MsmberStatewherethesystemsareintendedtobeusedandtoundergorepeated
inspections performedaccordingtoavarietyofmethods.
Sincepresentnationallawsarejustifiedbyalegitimatedesiretoprotect
consumersandusers,theonlywayofovercomingthedisadvantages stemming
fromtheirdivergencyandofcreatingtheconditionsneededfortheestablish­
mentoftheCommonMarketseemstobetoharmonizethoselaws.
Theexpression "measuringsystemsforliquidsotherthanwater"meanssystems
wherebyanyliquidproductotherthanwatermaybemeasuredasitpassesthrough
them.InadditiontooneormoremetersconformingtoCouncilDirective
K°71/319/SECandtheancillaryequipmentconformingtoCouncilDirective
N°71/348/EECwhichmaybeassociatedwiththemfthesesystemscomprisedevices
toensurecorrectmeasurementortofacilitateoperation.
•/
{1)O.J,N°L202,6September1971.

Measuringsystemsforliquidsotherthanwaterareintended ,eitherto
deliverortoreceiveparticularliquids.Thesemayobviouslyinclude
allhydrocarbons suchasdomesticfueloil,other .fueloil,petrolfor
roadvehicles,airci-aftandpleasureboats,andalsoliquidfoodproducts
(wine,milk,etc.)whicharedeliveredorcollectedinroadtankers.
Theimportanceofsuchmeasuringsystemsforliquidsotherthanwateris
evident.Theinstruments maybemountedonWorries,oronfixeddelivery
equipment(petrolpumps,etc.)oronpipelines.Kiththeaidofthose
instrumentsitispossibletomeasureliquidsotherthanwaterfairly
economically ,withoutwastingtimeandinthecasecfpipelines,without
interrupting theflowofliquid.
ThisDirectivelaysdownthegeneralprovisionsforsuchmeasuringsystems
andthedegreeofaccuracyandthenatureoftheinspections withwhichthese
systemsmustcomplyinordertoreceivetheE3Cmarksandsymbolsandthus
circulatefreelyintheCommunity.
ThisproposalforadirectivehasbeendrawnupattherequestoftheCouncil
which,initsresolutionof.21December1973onindustrialpolicy,invited
theCommissiontosubmitaproposalonthequestionbefore1January1975.
ThisDirectivealsoconstitutes asequeltoanumberofDire',tivesadopted
bytheCouncilonmeasuringinstruments ;itetrprlenentaiho
CouncilDirectiveof1971onmetersforliquidsother"ohanwater(7l/319/^SC)

-3-
Thetype ofharmonization adopted isthe optional system ,similar tothat
adopted formost oftheseparate Directives onmeasuring instruments .
This means that measuring systems forliquids other than water meeting
therequirements ofthis Directive maybemarketed andused freely between
theMember States andinside the Ifember States asmaythesystems complying
■with national regulations ineach oftheMember States individually .
CONSULTATION OFTEE EUROPEAN PARLIAIS3TT AND SCONOrTIC AND SOCIAL COMMITT EE
Theopinion ofthese twobodies isrequired inaccordance with thesecond
paragraph ofArticle 100because theimplementation oftheprovisions of
the .Directive will require theamendment oflegislation incertain Member
9
'States .

PROF'OSAL_FOR AvC^Ctt
ontinapproximation oftlielawsoftheI'emborStates
relatingtomeasuringsystemsforliquidsotherthan
water
THECOUNCILOPTEEEUROPEANCOLKUHITISS ,
HavingregardtotheTreatyestablishing theEuropeanEconomicCommunity,
andinparticularArticle100thereof;
HavingregardtotheproposalfromtheCommission ;
HavingregardtotheOpinionoftheEuropeanParliament ;
HavingregardtctheOpinionoftheEconomicandSocialCommittee;
«
WhereasineachMemberStatetheconstruction andmethodsofcontrolof
measuringsystemsforliquidsaresubjecttomandatoryprovisionswhich
differfromoneI"e<nberStaxetoanotherandconsequently -hindertr?dein
suchsystems;'whereasitisthereforenecessarytoapproximatethese
provisions ;
tfhareastheCouncilDirectiveof2oJu?.y1971(l)ontheapproximation of
thelawsoftheMemberStatesrelatingtomeasuringinutruarantE andmethods
ofsotrologicsl controlha-.!laiddowntheEECpatbom.approvalandEECinitial
verification procedureformeasuringinstruments ;whereas,inaccordance
with■{;jjj.^Directive,thetechnicalrequirementsforthedesignandfunctioning
ofmeasuringsystemsforliquidsotherthanwatershould,belaiddown;
WhereastheCouncilDirectiveof26July1971(2)ontheapproximation of
thelawsoftheIl-emberStatesrelatingtometersforliquidsotherthanwater
andthatof12October1971(3)ontheapproximation ofthelawsoftheMember
Statesrelatingtoancillaryequipmentformetersforliquidsotherthanwater
havealreadylaiddownthetechnicalrequirementsfordesignandfunctioning
whichinstruments mustmeet;andwhereasitisspecifiedintheDirectiveon
metersforliquidsotherthanwaterthatmeasuringsystemsincludingoneor
moremetersforliquidsotherthanwatermustbethesubjectofaseparate
Directive ;
\1)and"(2)~;O.J.N°L202,6September1971,p.1andp.32.
U)ïO.J.N°L239»25October1971,p.9.

I
•C-J.î .
H33ADOOT)THISDIRECTIVE:_,,
Article 1•-■•
ThisDirectiveappliestomeasuringsystemsforliquidsotherthanwater
k
incorporating volumetricmeterswithmeasuringchambers.
Artic1e2
ThoS3measuringsystemswhichmaybearEECmarksandsymbolsaredescribedinthe
Annexhereto®TheyshallbesubjecttoEEC'patternapproval -a^dshallunder­
goEECinitialverification undertheconditionslaiddowninthesaidAnnex*
Underthe.conditions -1.:laiddownintheAnnex,EECpatternapproval
mayalsobegrantedto\.-.componentsorsub-assemblies' ofameasuring
system.
Article3
NoMemberStatemay,forreasonsconnectedwiththeirmetrological qualities,
refuse,prohibitorrestrictthoplacingonthemarketorentryintoservice
ofmeasuringsystomsforliquidsotherthanwater .bearingtheEECpattern
approvalsymbolandtheESCinitialverification mrk. ••*
Art':c?.eA
1»TheIlemberStatesshallputintoforoethelws,regulations and
administrative provisionsneededinorderto-complywiththisDirective
withineighteenmonthsofitsnotification andshallforthwithinform
theCommissionthereof, r
2.MemberStatesshallcoasiunicate tothe-Commissionthetextofthe
provisions'ofnationallawwhich-theyadoptorintendtoadoptin-^c
fieldcoveredbythisDirective ,,
Article 5
ThisDirectiveisaddressedtotheIlemberStates.

ANNEX
1. GENERAL IîSQUIREEtëïTS PC3ISASUR1IÎG SYSTEMS
«=ï_=2r •m:.MK :-y Ajiygrv iviarŒSdaw
1.1 . ]>.%finitions
1.1.1 .Measuring system
Ameasuring system forliquids other taaawater comprises ,;.naddition ,to
themeter itself conforming toCouncil Directive 71/HS/'SSDandtheancilla­
ryequipment conforming toCouncil Directive 7--/34 -S/SE0 which mayoeasso­
ciated vitix it,alltheequipment toensure correct measurement oi«intended
tofacilitate theoperation andalloth-ar e<ju.ipsaent vjhica canaffect measu­
rement inerypossible way .
Ifs-rvferal meters intended forseparate measuring operations operate in ~-
conjunction with common components ,each meter shall "becons !dared as
comprising ,with thecommon components ,ameasuring system .
Ifseveral meters areintended forasingle measuring operation ,themeters
areconsidered asforming asingle ines.sr.ring system .
1.1.2 .Minimum dolivery
Theminimum delivery ofameasuring system isdetermined inc&rtor.nity with
therequiromenn specified inCouncil Directives 71/319./ESCand7l/348/SIDC
concerning meters forliquids other than water and -ancillary equipment for ,
maters forliquids other than water , .having regard totheprovisions ofthis
directive .
Inmeasuring systems intended tomeasrro liquid received into the system , .
the smallest volu&k ofliquid forvhich measurement shall "beauthorized is
called minimum reception .Thepreceding requirement relating tominimum
delivery applied ,byanalogy ,tominimum recent ion .
1,1.3 .ifaximum rate offlow
Themaximum permissible rate offlow ofameasuring system isthemaximum
rate offlow ofthecet&r ,or,ifseveral meters areconnected inparallel ,
thesumofthemaximum .rates offlow ofthese mexara ,except inthecase
where particular conditions imoose asmaller value .

ι
2-
1.1,>4»Gasseparator
Agasseparatorisanapparatusforcontinuouslyseparatingandremoving
byanappropriate arrangement enyairorgasescontainedintheliquid.
.Thegasevacuationarrangementis,inprinciple,automaticinoperatior
However,thisrequirementiswaivedifamechanismisprovidedwhich
matically .stopstheflowofliquidwhenairorgasislikelytoente
meter.Inthiscase,resumptionofmeasurementshallbepossible
whenthegashasbeenremoved,eitherautomatically ormanually./
1.1.5.Gasextractor 1
Agasextractorisanapparatusdesignedtoertractair<**g£30Siccumular-
tedinthepipeworkupstreamofthemeterintheform^cfp^ketsnomore
thanslightlymixedwitJrttieliquid, .-,
Theaboverequirements concerring"-thegasevacuationarrangementf°r^-1-e
gasseparatoralsoapplytothatoftha.gas.extractor.
1.1.6.Specialgasextractor
Aspecialgasextractorisanapparatuswhich,onthecnehand,likethe
gasseparatorbutunderlessstringentoperatingconditions,continuously
separatessny^airorgasescontainedintheliquidandontheotherhand
automatically stopstheflowofliquidwh^naircrgasesaccumulatedmtheformofpocketsno,morethanslightlymixedwiththeliquidarelikely
toenterthemeter.
1.1*7*Condensertray .
V.
Acondensertrayisaclosedtankdesigned-tocollect,-inpressurizedliquified»asmeasuringaysterosjthegasescontainedintheliquidtobe
measuredr-v..dtocondensethembeforemeasuring^
1.1.8.Gasindicator
Agasindicatorisanapparatusallowingeasydetectionofanygaseous
formationthatmaybepresentintheliquidflow.
1.1.9.Sight–glass ' '
Asight-glassisadeviceallowingtheleveloftheliquidtobecheckedin
apartofthemeasuringsystem.

-3-I
9
1*2. Field ofapplication
The rcrrui remsnts ofthis Annex apply toalltypes ofmeasuring system ,
provided that thespecial requirements inthoAnnex donotspecify
differ outrequirements .
1.3 . Heters
Meters incorporated inameasuring system ,including anyancillary equip­
ment fshall beofanEECpattern approved formeasurement oftheliquid
concerned innormal conditions ofuse .
These meters shall "bethe subject ofaseparate SSCpattern approval or
ofanapproval included intheSECpattern approval ofthemeasuring
system inwhich they areincorporated .
1.4 . Point oftransfe r
1.4.1 .Measuring systems shall incorporate apoint defining theliquid delivered
orreceived andcalled thepoint oftransfer .This point oftransfer is
situated downstream ofthemeter indelivery systems -,upstream of"the
metorinreceiving systems .
1.4.2 .Measuring sjrstems may -beoftwotypes :"dryhose "systems and"full hose"
systems ;theterm hose includes rigid pipework .
1.4.2.1 .Dryhose systems are ,inthecase ofdelivery equipment ,measuring systems
inifhich thepoint oftransfer issituated upstream ofadelivery hose .
This point oftransfer takes thefcrm ofeither aweir type sight glass
oraclosing device ,combined ,inboth cases ,with asystem which ensures
thecomplete emptying ofthedelivery hose after each measuring operation ,
1.4.2.2 .Full hose measuring systems are ,inthecase ofdelivery equipment ,measuring
systems ofwhich thepoint oftransfer comprises aclosing device situated
inthedelivery pipework .When thepipework hasafree end ,theclosing
device shall besituated asclose aspossible tothis end.
.1*4*2.3.Inthecase ofreceiving equipment ,thesame requirements apply ,byanalogy ,
tothe .reception pipework upstream ofthemeter .

«4-
Measuringsystemsshallincorporate ,upstreamofthe[meters,adevice
intendedtocollect,solidimpuritiesfromtheliquids(filter).
Filtersshallasfaraspossiblebesoarrangedastobeaccessible.
1«6.Eliminationofairorgases
1.6,1„Generalrequirement
Ameasuringsystemshallbeinstalledinsuchawaythatitdoesnot
normallyproduce,upstreamofthemeter,entryofairnorreleaseof
gasintheliquid*Ifthereisariskthatthisrequirementnightnot
bemet,measuringsystemsshallincorporategaseliminating equipment
permittingtheproperelimination ofanygasesthatmaybecontainedin
theliquidbeforeitpassesthroughthemeser.
Thegaseliminating equipmentshallbesuitableforthesupplyconditions
andarrangedinsuchawaythattheerrorduetotheinfluenceofthe
gasesonthemeasurementresultsshallnotexceedj
–0o5$°fthequantitymeasuredforliquidsotherthanpotableliquidsof
aviscositynotexceeding1mPa.s;
–1%ofthequantitymeasuredforpotableliquidsandthosewhosevisco­
sityexceeds1mPa»s.
Howeverthereshallbenoneedfortheerrortobelessthan1$ofthe
minimumdelivery. •■•
t
1*6.,2»Pimpedflow
1,6.2.1.Subjecttotheprovisionsin1.6,6cbelow.,whenthepressureatthepump
intakemay,evenmomentarily,fallbelowatmosphericpressureorthe
vapourpressureoftheliquid,agasseparatorshallbeprovided *
1.6.2.1.1..AgasseparatorshallbesubjecttoseparateEECpatternapprovalorto
approvalincludedintheEECpatternapprovalofthemeasuringsystem
ofwhichitformspari".
1.6.2.1.2-Thegasseparatorshallinprinciplebeinstalleddownstreamofthe
pump.Itmay?however,becombinedwiththepump.
Itshallalwaysbepositionedascloseaspossibletothemetersothat
thepressuredropduetotheflowofliquidbetweenthetwocomponentsis
negligible.

-5-
1.6.2.1.3.Thelimitsofopera-fcionofagasseparatorareasfollows:
a)themaximumrateorratesofflowforoneormorespecifiedliquids;
'b)themaximumandminimumpressurelimitscompatiblewithproper
functioningofthegaseliminatingapparatus.
1.6.2.1.4.WhenagasseparatoriscoveredbyaseparateESCpatternapproval,it
shall,withinthelimitoferrorslaiddownin1.6.1.,ensurethe
elimination ofairorgasesmixedwiththeliquidtobemeasured,under
thefollowingconditions :
3,)themeasuringsystemshalloperateatthemaximumrateofflowand
theminimumpressurelaiddownforthegasseparator;
b)anyproportionbyvolumeofgasesrelativetothemixtureofgas
andliquidispermissibleifthegasseparatorisdesignedforarateofflowlowerthanorequalto20m/h;itshallbelimited
to30%i^thegasseparatorisdesignedforarateofflowhigherthan20m/h.(Gasesshallbemeasuredatatmosphericpressureto
determinetheirpercentage).
'*
Asregardsseparatorsdesignedtooperateataflowrateofmorethan100m/h,however,patternapprovalscanbemadebyanalogy
withanapprovedpatternofthesamedesignandsmallerdimensions.
1.6.2.1.5^,Thenagasseperatorisapprovedasacomponentincludedinanapproved
measuringsystem,theaboverequirements maybeappliedtoit.
However,whenthemeasuringsystemincorporates agasindicatorconforming
tothedefinitionin1.1.8.,thogasseparatornoedonlymeetthe
requirementsof1„6.2»1.4»untilgasbubblesareclearlyvisiblein
theindicator.
Thesebubblesneednot,however,bepresentinthecaseofminutequantities
ofgasandtheseparatorshalloperateundertheconditionssetoutin
1.6.2.1.4.foranyvolumetricproportionofgaslessthan20fo.Experience
showsthatthisrequirementisgenerallymetbyaproperlybuiltseparatorifitseffectivevolumeisatleastequalto8%ofthevolumedelivered
inoneminuteatthemaximumrateofflowindicatedontheplateofthe
•measuringsystem.

-6-
1.6.2.2.Whenthepressureatthepumpinletisalwaysgreaterthanatmospheric
pressureandthevapourpressureoftheliquidandthereisnogas
seperator,agasextractororspecialgasextractorisnecesnaryif
gaseousformationsareliabletooccurbetweenthepumpandthemeter
duringnon-flowperiodsorifairpocketscanbeintroducedintothe
pipework(e.g.,whenthesupplytankiscompletelyempty).
1.6.2.2.1.ThegasextractororspecialgasextractorshallbesubjecttoESC
patternapprovalorapprovalincludedintheESCpatternapproval
ofthemeasuringsystemofwhichitformspart.
1.6.2.2.2.Thegasextractorcrspecialgasextractorshallinprinciplebeinstalled
downstreamofthepump.However,itmayalsobecombinedwiththepump.
Inbothcases,itsh-11normallybeinstalledatthehighestpointinthe
pipework,ascloseaspossibletothemeterandupstreri;,ofit.Ifitis
installedbelowthelevelofthemeter,anon-returndevice,fittedif
necessarywithapressurelimitingvalve,shallbeincorporated toprevent
theemptyingofthepipeworkbetweenitandthemeter.
Ifthepipeworkontheupstreamsideofthemeterincorporates several
highpoints,severalgasextractors mayberequired.
1.6.2.2.3.Thelimitsofoperationofagasextractororspecialgasextractorare
asdefinedforgasseparatorsin1.6.2.1.3.
1.6.2.2.4.Agasextractororrpecialgasextractorshalleliminateagaspocketof
avolumeatleastequaltotheminimumdeliverywithoutanerrorgreater
than1Jboftheminimumdelivery.
Theyshallalsobecapableofseparating'continuously avolumeofgas
equaltoatleast5i°ofthevolumeoftheliquiddeliveredatthemaximum
rateofflowwithouttheerrorinthemeasuringsystemvaryingbymorethan
0.5%
1.6.2-3.Therequirements in1.6.2.1.and1.6.2,2.shallnotprohibittheexistence
ofmanualorautomaticextractiondevicesinfixedinstallations oflarge
dimensions.
1.6.2.4.Ifthesupplyequipmentisarrangedinsuchawaythat,whateverthe
conditionsinwhichitisused,nogascanforminorpenetrateintothe
receptionpipeworkupstreamofthemeterduringmeasurement nogas
elimination deviceisrequiredprovidedthatthegasformationliableto
occurduringnon-flowperiodsnevercausesanerrorexceeding1£ofthe
minimumdelivery.

;
-7-
ls6e3oNcn–tiiunpedflou ,"
1«6O3,1«ViLenameterissuppliedbygravity,withoutuseofapump,if
thepressureoftheliquidinallpartsofthepipeworkupstream
ofthemeterandinthemeter',itself^isgreater*thanthovapour"
pressureandatmosphericpressure;itisnotnecessarytoprovide
agaselininator,Howovor,somearrangementshall,after-the
measuringsystenrhaBboonbroughtinto""service,ensureitsremainingcorrectlyfilled.
1«C.3»2»Ifthispressureislikelytobelessthanatmosphericpressure
whileremaininggreaterthanthevapourpressure,anappropriate
arrangementshallpreventtheintroduction ofairintothemeter.
1«6,,3*3»Inallcircumstances thepressureoftheliquidbetweenthe
meterandthepointoftransfershallbehigherthanthevapour
pressureoftheliquid.
1.6.3.4»Whenameterissuppliedundergaspressure,anappropriate
arrangementshallpreventtheentryofgasintothemeter.
*
1.5.4.Gasremoval
Thogasremovalpipeofagaseliminatorshallnotincludea
manuallycontrolledvalveiftheclosingofthisvalveprevents
theoperationofthearrangement.If,however,aclosingdevice
ofthiskindisrequiredforreasonsofsafety,asealingdevice
mustensurethat,whenopen,itremainsinthisposition.
1.6.5."Anti–swirldevice
Ifitisinbendedasageneralrulethatthesupply ,tankofa
measuringsystembecompletelyemptied,theoutletorificeof
thetankshallbeprovidedwithananti–swirldevice,exceptwhere
thesystemIncorporates agasseparators ..
1*6.6.Viscousliquid
Astheeffectiveness ofgasseparatorsandgasextractorsdecreases
withanincreaseinthyviscosityoftheliquid,thesecomponents
shouldnotbefittedinthecaseofliquidswithadynamicviscosity
ofmorethan2QmFa„sat20°C.Thepumpshallbosoarrangedthat
theinletpressureisalwaysgreaterthantheatmosphericpressure.
Ifthisconditionisnotlikelytobefulfilledonalloccasions,
anarrangementshallbefittedtostoptheflowoftheliquid
automatically assoonastheinletpressureislessthanatmospheric
pressure.Amanometershallbeusedtomonitorthispressure.
Theseconditionsarenotnecessaryifthemeasuringsystem
incorporates devicesensuringthatnoaircanbeintroducedthrough
thejointsinthesectionsofpipeworksubjectedtoreduced
pressure.

-3-
Vhenthemeasuringsystemisnotmuse,thepipeworkshall
bekeptfullofliquiduptothepointdefiningthequantities
measured.
1.7.Casindicator
1.7.1.Measuringsystemsmaybefittedwithagasindicator.These
arrangements may-bemadeobligatoryincasesspecified -in
Chapter2.
1.7.2.Thesmallesttypeofgasindicatorpermissibleforuseisa
transparentcylinderwithaninternaldiameterequaltothe
diameterofthemeterconnectingpipeand'withalengththree
timestheinternaldiameter;thelengthneedrot,however,be
morethan15cmm.
Iftheinternaldiameteroftheconnectingpipeisequaltoor
greaterthan80mm,itshallberegardedasadequateifthe
tubeincorporates sufficiently largetransparent sectionsfor
aix"orgasbubblestobeeasilyobservedthroughthem.Ifthis
isthecase,thelengthofthetransparent sectionsmustbeat
leastequalto150mm.
Thegasindicatormustbebuiltandinstalledinsuchawayas
toallowalltheliquidthroughwithoutanybeingleftbehind,-
Vlhenthegasindicatorisinstalledonaby–pass,aninstrument
mustbeinstalledonthepipesothat,forallratesofflow
withinthemeasuringrange,itispossibletoestablishtheflow
oftheliquid.
1.7.3*Thegasindicatorshallbedownstreamofthemeter.
1»7*4«Indryhosemeasuringsystemsthegasindicatormaytakethe
formofaweir-typesightglassandmayalsobeusedasapoint
oftransform
1B7*5*The£asindicatormaybeprovidedwithableedscreworsomeother
blow-offarrangement vmenitformsahighpointinthepipewbrk.
Nopipeshallbeconnectedtotheblow-offarrangement .Flow
indicators (e.g.spiralsorblamedwheels)maybeincorporated
inthegasindicator,providedthatsuchdevicesdonotprevent
theobservationofar.yformationsofgaswhichmaybecontained
intheliquid.„.

-9-
•1.8.Completefillingofthemeasuringsystem
1.8.1.Themeterandthepipeworkfromthemetertothepointof
transfershallbeautomatically keptfullofliquidduring
themeasuringoperationandwhenthesystemisnotinuse.
Ifthisconditionisnotfulfilled,particularly incases
wheretheinstallationisfixed,itmust"bepossiblefor
thecompletefillingofthemeasuringsystemuptothepoint
oftransfertobeeffectedmanuallyandmonitoredduring
measurement andwhenthesystemisnotbeingused.
Toensurethecompleteeliminationofairandgasfromthe
measuringsystem,blow-offarrangements,ifpossiblewith
smallwindows,shallbeprovidedatappropriatepositions.
1»8.2.Thepipeworkbetweenthemeterandthepointoftransfer
shallnot,.ingeneral,induce .errorsofmorethan.1foofthe
»minimumdelivery.
Chapter2shallspecifyinsomeparticularcasesthetechnical
conditionstobefulfilledinorderthatthisrequirement can
bemet.
1.8.3.Subjecttotheprovisionsin1.6.3.1,,1.6.3.2.and1.6.3.3.,
apressuremaintaining deviceshall,ifnecessary,beplaced
downstreamofthemetertoensurethatthepressureinthe
gas.eliminators andinthemeterisalwaysgreaterthan
atmosphericpressureandthevapourpressureoftheliquid.
1.8.4.Measuringsystemsinwhichtheliquidislikelytoflowinthe
directionoppositetothatfornormalflowwhenthepumphas
.stoppedshallbeprovidedwithanon-retumarrangement ,fitted
withapressurelimitingdeviceifnecessary.
1.8.5.Indry-hosemeasuringsystemsthepipeworkdownstreamfromthe
meterand,ifnecessary,thepipeworkupstreamofthemeter
shallcompriseahighpointsothatallpartsofthemeasuring -
systemsremainconstantlyfilled.Drainingofthedelivery
hosereferredtoin1.4.2.1.isassuredbyanairvent.In
certaincasesthisfacilitymaybereplacedbyspecialdevices
such'asanauxiliarypunporacompressed-gas injector.In
measuringsystemsdesignedforminimumdeliveriesoflessthan
10cubicmetres,suchdevicesshalloperateautomatically .

-10
1.3.6.Infull-hosemeasuringsystemsthefreeendofthehoseshall
incorporate ■a-devicetoensure -thatthehoseisnotemptied
duringperiodswhenthesystemisnotused.
Thisspecification maynotapplytoliquefiedgas.
Fhenaclosingdeviceisplaceddownstreamofthisdevice,
thevolumeofthespacebetweenthemshallbeassmallas
possibleandinanycaselessthanthemaximumpermissible
errorfortheminimumdelivery.
In.thisco.se,particularly forsystemsintendedformeasuring
viscousliquids,theendofthenozzleshallbesodesigned
thatitcannotretainaquantityofliquidexceeding0.4
timesthemaximumpermissibleerrorfortheminimumdelivery
ofthemeasuringsystem.
1.8.7.Ifthehosecomprisesseveralcomponents,theseshallbe
assembledeitherbymeansofaspecialconnectortokeepthe
hosefullorbyaconnectionsystemwhichiseithersealed
orensuresthatthecomponentscannotbeseparatedwitha
commonlyusedtool.
1.9.Variationofinternalvolumeoffullhoses
Inthecaseoffullhosesinameasuringsystem,theincrease
ininternalvolumeduetothechangefromthecoiledposition
whennotsubjectedtopressuretotheuncoiledpositionwhen
subjectedtothepumpingpressurewithoutanyflowofliquid
shallnotbemorethantwicethemaximumpermissibleerror
fortheminimumdelivery.
Ifthemeasuringsystemisnotprovidedwithahosestowage
drum,theinternalvolumeincreaseshallnotexceedthe
maximalpermissibleerrorfortheminimumdelivery.
1.10.Branches
1.10.1.Inmoasuringsystemswhichareintendedtodeliverliquids,
branchesdownstreamofthemeterarepermittedonlyifthey
aresoarrangedastoensurethattheliquidisonlydischarged
fromoneoutletatatime.'Inmeasuringsystemswhichareto
receiveliquids,branchesupstreamofthemeterarepermitted
onlyiftheyaresoarrangedthattheintakeofliquidi3
effectedonlythroughonepipeatatime.

-11-
Departures from these requirements canonly beapproved m
the case ofdelivery systems which areinstalled sothat they
cannot supply more than oneuser atatime andreceiving
systems which cannot operate formore than onesupplier at
■ atime .
1.10.2 .Inmeasuring systems operating either with adryhose orafull
hose andhaving flexible pipes ,anon-return valve shall be
incorporated intherigid pipework leading tothefull hose
immediately downstream from theselector valve .Inaddition
the selector valve shall not inanyposition permit connection
ofthedischarge hose operating asadryhose with thepipework
leading tothefull hose . , .
1.11 .By-T>asses
Anyconnections intended forby-passing themeter shall be
closed bymeans ofblanking flanges .However ,iftheoperating
requirements make such aby-pass necessary ,itshall beclosed
either bymeans ofaclosing disc orbymeans ofadouble
closing arrangement with amonitoring cock inbetween .
Closure shall becapable ofbeing ensured bymeans ofstamped ■
seals .
1.12 .Valves andcontrol arrangement s
1.12.1 .Ifthesupply conditions areliable tooverload themeter ,a
flow-limiting device shall beprovided .This arrangement
shall beplaced downstream ofthemeter ifitcauses a
pressure loss .Itshall becapable ofbeing sealed .
1.12.2 .Thevarious positions fortheoperating components ofmulti-way
valves shall beeasily visible andlocated bynotches ,stops or
other secure arrangements .Departures from this requirement
areacceptable whenever the adjacent positions oftheoperating
handle form anangle ofatleast 90° •
1.12.3 .Retaining valves andclosing arrangements notused todefine
thequantity measured mayhave relief valves inorder to
dissipate anyabnormally high pressures which mayarise in
themeasuring system .

-12-
1.13.layoutofmeasuringsystems
Heasuring.systemsshallbeinstalledinsucxiamaimerthat
theindicatingdeviceisclearlyvisibleinnormalconditions
ofuse.Ifpresent,thegasindicatorandthesight-glass
ofthegasseparatorshallasfaraspossiblebeobservable
fromoneposition.Sealingdevicesshallbeeasilyaccessible ,
platesshallbefixedirremovably andthestatutorymarkings
shallbeverylegibleandindelible.
1.14.On-siteverification devices
1.14.1.Theinstallation shallpermittheperformance ofon-sitetesting
ofthevariouscomponents ?ndverification oftheentiresystem
innormaloperatingconditions.Ifnecessary ,pipeworkshall
beprovidedtoreturnthemeasuredliquidtoastoragetank.
Theinstallation shall,asnecessary,beequippedwith
temperature andpressuretappings,especially whentheoperation
ortestingofthemeasuringsystemsrequiresa,knowledgeof
thesefactors.
1.15»Characteristics ofameasuringsystem
Thecharacteristics ofameasuringsystemareasfollows:
-maximumrateofflow;
-minimumrateofflow;
-maximumopérâtingpressure;
-minimumoperatingpressure;
-description oftheliquidorliquidstobemeasures;
-minimumdelivery.
1.16.Legends
1.16.1.Ameasuringsystem,componentorsub-assembly havingreceived
patternapprovalshallcarryaspecialplategivingthe
followinginformation :

-13-
a)theEECpattern approval symbol ;
b)theidentification mark orname ofthemanufacturer ;
c)thedescription chosen bythemanufacturer ,ifany ;
d)theserial number andyear ofmanufacture ;
e)thecharacteristics ofthemodel .
Ifseveral meters operate .inasingle system with theuse of
common components ,thelegends required foreach part ofthe
system maybecombined onasingle plate .
Thelegends onthe dial oftheindicating mechanism ofthe
meter forming part ofthemeasuring system must notcontradict
those onthe rating plate ofthemeasuring system .
/
Theindications ,legends ordiagrams required bythedirectives
concerning themeasurement ofliquids other than water (*)
orbythepattern approval certificate shall bemarked very
visibly either onthedial oftheindicating mechanism or
very close toit.
1.17 .Placing ofseals andverification marks
Sealing devices shall beconstructed soastoallow the
application bystamping oftheEECinitial verification marks .
Sealing devices requiring theuse ofsealing pincers shall
bepwrmitted only oninstruments that aretoofragile toallow
themarks tobeapplied bystamping .Inallcases ,the
sealing devices shall beeasily accessible .
The stamp -date referred toin3.3.2.1 .ofJinnex IIofthe
Council Directive 7l/3l6/EECof26July 1971 shall besealed
toasupport ofthemeasuring system .
Itmaybecombined with therating plate ofthemeasuring
system referred toin1.16 ,Inorder toallow dismantling -
forcleaning purposes ,the seals shall notbeapplied v;hen
themeasuring sj^stem isused forpctable liquids .1.16.2 .
à
T*j Directives 7l/3l9/EEC -and71/348/EECandthis Directive .

-14-
Accesstopartswhichallowthemeasuringresulttobe
modifiedanddismantling ofthevariouscomponent
instruments ofthemeasuringsystemshallbeprevented
bymeansofsealingdevices.
However,sealingdevicesneednotbeinstalledon
connections madeinsuchawsythatitisvirtually ,
impossibletodismantlethemwithacommonlyusedtool.
Furthermore ,exceptions maybeprovidedforinthe
certificateofapprovalformeasuringsystemswhich
needtobedismantledinthecourseofuse(measuring
systemsforpotableliquids,forexample).

-15-
2.PROVISIONS SPECIFICTODIFFERENT TYPESOFMEASURING SYSTEMS
2,1.Liquidfuelmeasuringsystem(*)
2.1.1.Liquidfuelmeasuringsystemsaremeasuringsystemsintendedforthe
deliveryofliquidfuelintothefueltanksofroadvehicles.
Thesemeasuringsystemsmaybeusedforrefuellingpleasureboats
andsmallaircraftwithliquidfuel.
Theymayincludetheirown.supplyarrangementor"bedesignedfor
installation inacentralsupplysystem.
2.1.2.Whenthemeasuringsystemcomprisesitsownsupplyarrangement ,agas
separatorshallbeplacedimmediately upstreamofthemeterinlet.
Thisgassepamtershallmeettherequirements setoutin1.5.2.1.4*
orin1.6.2.1.5 *Inthelattercase,experienceshowsthatthe
requirementisgenerallymetiftheeffectivevolumeoftheseparatorisatleastequalto57^ofthevolumesuppliedinoneminuteat
themaximumrateofflowindicatedonthemeterplate.
2.1.3.Whenthemeasuringsystemisdesignedforinstallation inacentral
supplysystem,thegeneralrulesin1.6.shallbeapplied.
2.1.4*Thesemeasuringsystemsshallincorporate adeviceforresetting
tozerothevolumeindicatorconformingtoitems1.1.,1.2.,1.3.
and1.5*of"theAnnextoCouncilDirective71/31-8/EEC,aswellr,Ba
volumetotalizer.
Ifthesesystemsalsoincorporateapriceindicator,thisshallbe
fittedwithadeviceforresettingittozero,aswellas&price
totalizer.
Devicesforresettingthepriceindicatorandvolumeindicatorto
zeroshallbeincorporated insuchawaythattheresettingofeither
oftheseindicatorstozeroautomatically causestheresettingof
theothertozero.
(*)Measuringsystemsincorporating :-motorfuelblendingmeters.
-motorfuelandlubricantblendingmeters
-electric .,endelectronicindicatorsand
1 ancillarydevices;
-self-service devices:
-measuringsystemsintendedforthe
supplyofliquefiedgas,
arenotincludedunderthisheading.

-16-
2.1.5.Hhentheroadfuelmeasuringsystemcomprisesitsownsupply
arrangement operatedbyanelectricmotor,amechanismshall,
afterthemotorhasbeenstopped,preventanyfurtherdelivery
oftheliquiduntiltheindicatorhasbeer}returnedtozero.
Undernocircumstances mayresettingtozerobepossible .during
delivery.
Inmeasuringsystemssuppliedbyacentralsystemthepreceding
requirementshallbemetbymeansofanautomaticclosingmechanism.
2.1.6.Thenon-returndevicereferredtoin1.8.4.shallboobligatory.
Itshallbeplacedbetweenthegaseliminator andthemeter.
Howeveritmaybeplacedimmediatelyafterthemeterifthegas
eliminatorisinstalledabovethemeter.Inthiscase,itmaybe
combinedwiththedeviceprovidedforin1.8.3.VThenthenon-return
deviceisplacedbetireenthegaseliminatorandthemeter,the
resultingpressurelossmustbenegligible.
2.1.7.Hosesshallincorporateamanualclosingmechanismwhichmeetsthe
requirements of1.8.6.i\nautomaticclosingmechanicsmay
alsobeincorporated .
Infull-hosemeasuringsystemswhicharesuppliedsolelybymeans
ofahand-operated pump,onlytheclosingmechanismreferredtoin
1.8.6.isrequired.
2.1.8.Theliquidfuelmeasuringsystemsdefinedin2.1.1.above
shallbesubjecttopattornapproval.
Whensuchsystemsareintendedforinstallation inacentralsupply
system,patternapprovalshallbesupplemented byoneormore
typicaldrawingsshowingtheinstallation conditionsatthepoint
ofuse.
2.1.9.Measuringsystemswithamaximumflowrate(Qmax)equaltoorless
than100l/minmusthaveaminimumdeliverynotexceeding51«
2.1.10.Initialverification
Inaccordancewith3.2«,initialverification ofliquidfuel
measuringsystemsshallbecarriedoutinoneortwostagesdepending
onwhetherornottheyhavetheirownsupplysystem.

-17-
2.2.Measuringsystemsfit-feedtoroadtankersforthetransportarid
deliveryofliquidswithlowviscosityandlowvapourprossure
(exceptpotableliquids)
2.2.1.Thefollowingprovisionsshallapplytomeasuringsystemsfitted
toroadtankersortransportable tanks.
2.2.2.Tanksfittedwithameasuringsystemmayincorporate oneormore
compartments .
2.2.3.Whereatankincorporates morethanonecompartment ,eachcompartment
shallhaveitsownlock(manualorautomatic).
2.2.4»Inaccordancewithnationalrulesonuse,ifany,eachmeasuring
systemshallbeusedforaspecifiedproductorforaclassof
productsforwhichthemeterhasreceivedtheEECinitialverification
marks.
Thepipeworkshallbesodesignedthatthemixingofproductsin
themeasuringsystemiseasilyprevented.
2.2.5*Wheretanksarefittedtotrailersorsomi-trailers ,themeasuring
systemsmaybeaffixedeithertothetractorortothetraileror
semi-trailer .
2.2.6.Ameasuringsystemfittedtoaroadtankermaybeofthedry-hose
orfull-nosetype.Itmayalsohaveeitheronedryhoseandone
fullhoseortwofullhosesofdifferentdimensionsarrangedsoas
tooperatealternately.
Inthelattercase,change-overshallnotbepossibleduringdelivery.
Tothisend,change-over maybecoupledwiththeresettingtozero
ofthevolumeindicator.
2.2.7«Wherethemeterisfittedwithaticket-printer ,theprintingofthe
ticketshallbecoupledwiththeresettingtozeroofthevolume
indicator.
2.2.8.Ameasuringsystemfittedtoaroadtankermaybedesignedto
operatesolelybypump,solelybygravity,eitherbypumporby
gravity,orbygaspressure.

-18-
2.2.8.1.Measuringsystemssuppliedsolely "bypumpmayoperateasfull-hose
orasdry-hosesystems.
2.2.8.1.1.Ifthereisariskthattheconditionin1.6.2.4»maynotbemet,
themetershallbeprecededbyagaseliminatorsuchas:
a)asuitablegasseparator;
b)agasextractor;
c)aspecialgasextractor.
Whenthemeteroutletpressureinthemeasuringsystemmaybelower
thanatmosphericpressurebuthigherthanthevapourpressureof
theliquidmeasured,thesedevicesshallbecombinedwithsinautomatic
systemtoslowdownandstoptheflowtopreventanyairpassinginto
themeter.
When,ontheotherhand,thereisnoriskthatthemeteroutlet
pressuremaybelowerthanatmosphericpressure(whichisthecase,
inparticular,insystemsoperatingonlyonfull-hose)theuseof
automaticmechanismstoslowdownandstoptheflowisnotobligatory.
2.2.8.1.2.Iftheseparatorconformstotherequirements of1„6.2#1.5«»
theeffectivevolumeofthegasseparatorshallbeequaltoatleast
5Joofthevolumedeliveredinoneminuteatthemaximumrateof
flowofthemeasuringsystem.
2.2.8.1.3Thespecialgasextractorwithanautomaticstopdeviceshallbe
fittedwithasight-glass conformingwith1.1,9*
Experience showsthatinthiscasethegasindicatorprovided
forin1»1.8.isnotnecessary..
2.2.8.1.4.Thecompartments inroadtankersshallbefittedwithenanti-swirl
device,exceptwhenthemeasuringsystemhasagasseparator
conformingtotherequirements of1.6.2*1.4.
2.2.8.1.5.VJhereameasuringsystemisfittedtoatankofthecalibrated-
containertype,thistankmayceasetobeconsideredasacalibrated
container.
Foratanktocontinuetoberegardedasacalibratedcontainer,
thepipeworkmustbeorganizedinsuchawaythattherequirements
concerningcalibratedcontainerscontinuetobemetandfraudulent
manipulation oftheinstallationisprecluded.Iftheinstallation
incorporates apumpandthepumpisarrangedsoastoallowdirect
deliveryfromafullcompartmentwithoutusecfthemeter,that
pumpmustbeinstalledsothatitemptieswhollybygravity.

2.2.8.2.Ileasuringsystemsoporatingsolely "bygravityshallmeetthe
followingrequirements :
2.2.8.2.1.Theequipmentmust"besodesignedthatthetotalcontentofthe
compartmentorcompartments canbemeasuredatarateofflow
greaterthanorequaltotheminimumratecfflowthroughthe
measuringsystem.
2.2.8.2.2.Iftherearelinkswiththegasphaseinthetank,appropriate
devicesshallpreventanygasfromentering ,themeter.•.
2.2.8.2.3.Thecompartments ofthetankshallbefittedwithananti-swirl
device. ' ..
2,2.o.2.4.Theprovisionsof1.6#3.1.»1.6.3»2.andl»6e3»3.shall
apply..Anaccelerating pumpmaybeuseddcwnstre&inofthepoint
•oftransferiftheforegoingconditionsaresatisfied.Sucha
pumpshallnothavetheeffectofincreasingtherateofflow
atthemeter.
2.2.8.2.5*In somemeasuringsystems,particularlythosehavingaspecialgas
extractorwithanautomatic -stopdeviceandthosehavingameans
ofpermmontventingtotheatmosphereimmediately downstreamofthe
pointoftransfer,agasindicatorshallnotberequired.
■Ontheotherhand,inmeasuringsystems'withamanualreleaseinto
'theatmosphere -immediately downstream o.fthepointoftransfer,a
gasindicatorshallbeobligatory. ••
2.2.8.3.Measuringsystemswhichcanoperateeitherbypumporbygravity
shallsatisfytherequirementslaiddownin2.2.8,1,and
2.2.3.2.
2.2.0.4.Measuringsystemsfedbymeansofgaspressuremayoperateas
dry-hoseorasfull-hosesystems.Thepipeworklinkingthedevice
referredtoiri'1.6.3.4#(l)abovewiththemetershallnot
''■incorporate anyconstriction orcomponentlikely -tocauseapressure
lossgeneratinggasformationbyreleasingthegasdissolvedinthe
liquid.
Suchsystemsshallincorporateagaugeshowingthepressureinsidethe
tank.'Thedialofthispressureshallindicatethezoneofpermissible
pressures . *:•
i,l)ArrangementtopreventgasenteringtHemeter,
asspecifiedin1.6.3.4.

«.-
-.2«3»_r!eocpti^nmgr^rinprystemsfortheunloadingofships,tankwvfons
androadtinkern:
2.3.1.Heasuringsystemsdesignedtomeasureliquidsunloadedfromtinker
ships,tankwagonsandroadbankersshallincorporate anintermediate
tankinwhichtheleveloftheliquiddeterminesthepointoftransfer.
Thisintermediate tankmaybofittedwithgasilLimination equipement.
2.3»l»l.Inthecaseofroadtankersandtankwagons,theintermediate tank
shallautomatically maintainaconstantlevelwhichisvisibleor
otherwisedetectableatthe«Tartandoncompletionofthemeasuring
operation.Thepermissiblevariationsintheconstantlevelshall
correspondtoavolumeequaltonomorethanthemaximumpermissible '
errorfortheminimumreception.
2.3.1.2.Inthecaseoftankershipsprovisionforautomaticmaintenance of
aconstantlevelisnotnecessary;inthatcase,variationsinthe
contentshallbemeasurable.
Ifthetankershipisemptiedwiththeaidofpumpslocatedinthe
bottomoftheship,theintermediate tankneedonlybeusedatthe
beginningandendofreception.
2.3.1.3.Inthetwolattercases,thecross-section oftheintermediate tank
shallbesuchtluvtaquantityequaltothemaximumpermissible
errorfortheminimumreceptioncorrespondstoadifferencein
levelofatleast2mm.
2.4»Pressurized liquefiedgasmeasuringsystems,whetherstationary or
fittedtoroadtankers ■
2.4.1.Thereshallboapermanentlinkalongrigidpipeworkbetweenthese
measuringsystemsandtheirfeedtanks.Ancn-roturnvalvesl.all
bofittedbetweenthefeeltuiksandthemeter.
2.4.2.Apressuremaintenanc-e devicelocateddownstreamofthemotor"shall
ensurethattheproductisinaliquidstateinsidethemeterduring
themeasuringprocess.Therequiredpressuremaybemaintained
eitheratafixedvalueoratavalueadjustedtosuitmeasurement
conditions.

-21-
*•^ ..
2.4.2.1.Wherethepressureismaintainedatafixedvalue,thelatter
shall "beatleastequaltothevapourpressureoftheproduct
atatemperature 15°Chigherthanthohighestpossiblein-service
temperature .Thesettingofapressure-maintenance deviceshall
besealable.-
2.4.2.2.Wherethepressureisadjustedtosuitmeasurementconditions ,it
shallexceedthevapourpressureoftheliquidbyaleastonebar
duringmeasurement.Thisfunctionshallbeautomatic.
2.4.2.3.Inthecaseofstationarymeasuringsystemsforindustrialuse,
thocompetentKotrologyServicemayauthorizetheuseofmanually
adjustablepressure-maintenance devices,inwhichcasethepressure
atthemeteroutletshallnotbelessthanthevapourpressureof
theproductatatemperature 15°Cabovethetemperature ofthe
liquidduringmeasurement .Adiagramshouldbeaffixedtothe
measuringsystemtoshowthevapourpressureoftheproductmeasured
■asafunctionofitstemperature .Ifitisanticipatedthatthese
measuringsystemsmayhavetooperateunsupervised forlongperiods,
thetemperature andpressureshallberegisteredcontinuously by
recordingequipment.'
6
2.4.3.Upstreamofthemeterthereshallbeagas-elimination device
consistingofeitheragasseparatororacondensertray.
2.4.3.1.Thegasseparatorshallsatisfythegeneralrequirements laid
downinsectionlforeithertheliquefiedgasitselforaliquid
cfgreatervisoosity..-
Eowever,becauseofverification difficulties ,itispermissible
foragasseparator .tobeapprovedifits.effectivevolumeisnot
lessthan1.5^ofthevolumedeliveredinone.minuteatmaximum
rateofflov;incaseswherethepipeconnectingthemetertothe
storagetankisnotlongerthan.25m."henitexceeds25min
length,theeffectivevolumeofthegasseparatorshallbenot
lessthan3%ofthevolumedeliveredinoneminuteatmaximum
rateofflow.
Itisnotnecessarytofiteitheragasindicatororasight-glass
toliquefiedgasmeasuringsystems*
Thegasevacuationductmaybe,connectedtothespacecontaining
the,gasphaseiuthe.feedtankortoaself-*containod pressure-
maintenancedevicesetatapressure0.5toibarbelowtho
*pressureatthemeteroutlet.Thisductmayincorporate ashut-off
valve,butitmustnotbepossibletoclosethisvalveduringthe
measuringprocess.-

2.4.3.'2,Thevolumeofthecondensertr?;yshall.dependonthevolumeofthe
pipeworkbetweenthefeed–tankvalveandthepressure-maintenance
valvedownstream ofthemeter.Itshallnotbelessthantwice
thereductioninvolumeoftheliquidliabletooccurifthe
temperature dropsbyavalueconventionally fixedat10°Cfor
pipeworkexposedtotheatmosphereand2°Cforburiedortheijnally
insulatedpipework.Tocalculatethecontraction ,thecoefficient
ofthermalexpansionshallberoundedoffto3.1Cf~perdecree
Celsiusforpropaneandpropyleneandtc2.10"-*perdecreeCelsius
forbutaneaaidbutadiene.Forother,produuxswithahighvapour
pressure,thevaluesof.thecoefficienttobeadoptedshallbe
fixedbythecompetentMetrologyService.
Thecondensertrayshallbefittedwithamanuallyoperatedblow-
offarrangement .
Inameasuringsystem,thecondensertrayshallbelocatedatthe
highestpointinthepipework.
Thevolumecalculatedbytheforegoingmethodmaybespreadover
severalcondensertrayslocatedatthehighestpointsinthe
pipework.
2.4.4*Athermowellshallbeprovidedintheimmediatevicinityofthe
meter.
Theusershallbeinpossessionofaverifiedthermometer graduated
atintervalsnotexceeding0.5°C.
Apressuregaugeshallbefittedbetweenthemeterandthepressure-
maintenance valve.
Formeasuringsystemsincorporated in:roadtanker3»apressuregauge
sociketwillberegardedasadequate. ..
2.4.5.Duringmeasurement ,thereshallbenoconnectionbetweenthegas
phasesinthestoragetankandthereceptiontank.
2.4«6.Safetyvalvesmaybeincorporated intomeasuringsystemsforthe
purposeofpreventingabnormallyhighpressure.T"thesevalves
arelocateddownstreamofthemeter,theyshall.-openintothe
atmosphereorbeconnectedtothereceptiontank.
Undernocircumstances shallthesafetyvalveslocatedupstream
ofthemeterbeconnectedbypipingwhichby-passjsthemeterto
thevalveslocateddownstream .

~23
2.4.7 .Where operating conditions necessitate theuseofdetachable
hoses ,these hoses shall remain full iftheir volume isgreater
than themaximum permissible error 'for theminimum delivery .
Detachable full hoses shall beequipped with special "coupler "
connections forfull hoses .Manually operated blow-off
arrangements shall beprovided ,ifnecessary ,attheends of
these hoses .
2.4.8 .Themonitoring cock ofthedouble closing arrangement specified
in1,12 forsnypipework by-passing themeter must be
capable ofbeing shut offforsafety reasons .Insuch cases ,
leaktightness shall bemonitored byapressure gauge fitted
between thetwo shut-off valves orbyanyother equivalent
system . . ... ... -
2«5 »Measuring systems fitted topipelines
2.5.1 .Themeasuring systems referred toarethose fitted oneither
piping connecting two stationary tanks orpiping leading toor
from apipeline ordepot , . . >
2.5.2 .Ifseveral pumps aremounted inseries inapumping station ,
anautomatic locking mechanism shall ensure that thepumps are
sot inoperation inthe correct order ,ifnecessary ,this
mechanism shall besealable .
2.5»3 «Anappropriate device shall prevent the liquid' flowing against
the normal direction offlow .
'2.5.4 .Ifsafety valves arefitted .onthepipework upstream anddownstream
ofthemeter ,the -discharge pipes from thevalves located upstream
ofthe meter shall not lead tothe same tank asthose from the
valves downstream ofthe meter . • •, .
2.5.5 .Heters fitted topipelines tomeasure insuccession liquids of
different natures must ,ifpossible ,beequipped with automatic
correcting device toensure that therequirements ofitem 6.2.
ofCouncil Directive N°71/319/EEConmeters forliquids other
than water aresatisfied .These correcting devices shall be
subject topattern approval .

-24-
However,ifthe.measurementresultsareusedsolelyfor
commercialoperationsorforfiscaloperationsconcerninga
limitednumberofpersonsorbodiesdesignatedincontracts ,
pipelineoperatorsmaybeauthorizedtomeasureinsuccession
liquidsofdifferentnaturesusingthesamemeter,eveniftho
variationsinthoerrorduetothevariationsintheproperties
oftheliquidsaresuchthattherequirements ofitem6,2.
oftheabovementioned DirectiveN°71/319/ESCcannotbesatisfied.
Inthiscase,theusershallcorrectthemeasurementrosultsby
applyingthecorrectioncoefficients laiddownforvarious
viscosityzonesxd-thinwhichtheprovisionsspecifiedabovemust
-becompliedwith.
2.6.Measuringsystemsformilk
2.6.1.Thefollowingrequirements applytoportablemeasuringsystems
usedforthereceptionofmilkbycollectingtankers,tofixed
measuringsystemsusedforreceptionlndairiesandtoportable
orfixedmeasuringsystemsusedforthedeliveryofmilk.
2.6.2.Inreceptionequipment,thepointoftransferconsistsofa
constantlevelinatanklocatedupstreamfromthemeter.'
Thisconstantlevelmustbevisiblebeforeandaftereach
measuringoperationsItmustbeautomatically re-established .
2.6.2.1..Whenthemeterissuppliedbyapump,theconstant-level tank
maybeplacedbeforethepumporbetweenthepumpandthemeter.
2.6.2.1.1.Inthefirstcasethetankmayitselfbesuppliedbygravity,
bytheemptyingofchurns,withtheaid.ofanauxiliarypump
oravacuumsystem. .
Ifthemilkisdeliverodintothetankwiththeaidofapump
oravacuumgystem,.-agasjeliminatorisnecessary;thiseliminator
.,maybecombinedwiththeconstant-level tank.•
2.6.2*-l«2.In thesecondcaseftheconstant-level tankmustactasagas
eliminator.

25-
2.6.2.2.Notwithstanding thoprovisionedofI.8»3.»"thoraotornay
besupplied-by'avacuum-•eyatemv"--In-tiiis-case,"sincethepressure
insidethepipeworkbetweentheconst,?jat~leveltankandthemeter
islowerthanatmosphericpressure,thepipeworkconnections must
beperfectlyleaktight.Itmustbopossibleto.verify.this
leaktightness .
2.6.2.3.Inallcasesofreception,thepipeworkupstreamoftheconstant-
levelmustbecompletelyemptiedbyanautomaticmechanismin
usualoperatingconditions..
\
2.6.2.4.Theconstantlevelshallbemonitoredbymeansofasight-glass
orlevelindicator.The'levelwillberegardedasconstantwhen
itsettleswithinazonelyingbetweentwo.linescorresponding
toadifferenceinvolumeofnotmorethantwicethemaximum
permissibleerroronminimumdelivery *Thedistancebetweenthe
twolinesmustbeatleast20mm,
2.5.2«5»"tomeettheaforementioned requirement,decelerating mechanisms
areincorporated inthemeasuringsystem,therateofflowduring
.thedeceleratingperiodmustnotdescendbelowtheminimumflow^
rateofthemeter.
2.5*2.6.If,jinreceptionequipmentindairies,theliquidmeasuredis
conveyedatalevellowerthanthatofthemeter,anautomatic
mechanismshallensureapressurehigherthan,atmospheric
pressureatthemeteroutlet.
2.6.3.Measuringsystemsusedforthedeliveryofmilkmustmeetthe
requirements ofsection1. 1
2.6.4.Notwithstanding thegeneralprovisionsofsection1onthe
elimination ofairorgas,gaselimination mechanismsmustmeet
therequirements of1,6.1,solelyinoperatingconditions,
i.e.whenairentersatthebeginningandendofeachmeasuring
operation, ..
Forreceptionequipment,theusermustbeabletoascertainthe
leaktightness oftheconnections sothatnoairi;sadmitted
upstreamofthemeterduringmeasuring.Fordeliveryequipment,
thesystemmustbeassembledsothattheliquidpressureis
:alwr.yspositiveintheconnectingpipesrunningfromthesupply
tank. ;:

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3.EECPATTERNAPPROVAL ANDEECINITIALVERIFICATI Gii
3.1,'aECpatternapproval
3.1.1»ESCPatternapprovalshallrelateeithertoameasuringsystem
capaoleofbeingtransportedtotheinstallation sitewithout-
priordismantling ortoacomponent,approvalofwhichislaid
downbyadirective(meter,ancillaryequipment,gaseliminator),
ortoasub-assembly thatcanbotransportedwithoutdismantling
consistingofoneormorecomponents ,patternapprovalofwhich
islaiddowninadirective.
Forthemeasuringsystemsreferredtointheaboveparagraph ,EEC
patternapprovalmaybebasedonplansindicatingthecharacteristics
ofthevariouscomponentsandtheirrelativepositions.
3.1.2.Teststobecarried ,out
3.1.2.1.TheEECpatternapprovalexaminationshallincludeinspectionofthe
pipingdiagramsanddrawingsofthemeasuringsystem.
«.. .0 %*
Inaddition,testsshallbecarriedoutmaccordancewiththe
followingspecifications .
Intheexecutionofthesetests,theworkstandardsandtheiruse
shallbedeterminedinsuchawaythatthemeasuringinaccuracyof
thecalibration methoddoesnotexceedone-fifthofthemaximum
permissibleerrorfortheinstrumenttested.
3.1.2.2.ïletertest
Itisfirstnecessarytodeterminethecurveoferrorsasafunction
('ofrateofflow,usingasufficiently largenumberofmeasuring
pointsintheflowzone.Itisnecessarytoverifyinparticular
thewidthoftherangeoferrorsofthe'meterinthezone;
thepositionoftheerrorcurveinrelationtothezerolineisof
lesserimportance.
Itmayalsobonecessarytocarryouttestsoutsidetheflowzone,
especiallyformetersandmeasuringsystemsforlowviscosityliquids
(dynamicviscositynotover17cP).
Testsmustalsobecarriedoutatthelimitsofoperatingconditions ,
i.e.,forthemaximumandminimumtemperatures andviscosities
specifiedandforminimumdelivery.

-27-
Inallcases,thetestvolumeshallbeselectedsoastobelarge
enoughtoensurethatthevalueofthescaleoftheindicatoris
nevergreaterthanone-thirdofthemaximumpermissibleerror.
3.1.2.3.Testofairorgaselimination.
Wheretherearegasseparatorsandspecialgasextractors ,continuous
eliminationshallbecheckedbycomparisonofthemeasurementresults
ofasuitablevolumetricmeterinserteddownstreamoftheseparator
(specialextractor)withorwithouttheadditionofairorgas.
Forspecialextractors ,itisalsonecessarytotestcomplete
emptyingofthetank.Ifpossible,thetesl£shouldbecarriedout
withtheleastfavourableliquid.Intestsonmock-upsormodels
onadifferentscalefromtheactualequipment,accountshallbe
takenofthelawsofsimilarityconcerningviscosity(Reynolds),
gravity(Froude)andsurfacetension(Weber).Asageneralmile
testsonmodelsshallbeusedonlyforapplications wheretheyare
justified.
3.1.2.4*Testsonspecialmeasuringsystems
3.1.2.4.1.Liquidfuelmeasuringsystems
Thetestsshallcomprise:
a)checkingofthemeter,includingdetermination oftheinfluence
ofancillaryequipment(priceindicator,printer,presetting
device,etc..);
b)checkingofthegaseliminator;
c)checkingoftheconstancyofthehosevolume;
d)aspecialchecktoverifyregularadvanceofthepriceindicator
(irregularadvancemaybeinducedinthefirstcomponentofthe
priceindicatorbysuddenclosingofthedeliveryvalve).
3.1.2.4*2.Liquefiedgasmeasuringsystems
Thoexaminationshallcomprise:
a)verification ondrawingsofgasseparatorsasregardsareaof
efficiencyandmounting;
b)anoperatingtestonthegaseliminator(levelregulator)
incorporated inthegasseparator.3.1.2.3.
3.1.2.4.

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Thepressurizing device shall also beverified onthedrawing .
Amodel test maypossibly berequired inspecial cases bythe
inspection authority .
3.2 . SEC initial verification
3.2.1 . General
3.2.1.1 .ESCinitial verification iscompulsory forthemeasuring systems
referred toin3.1.1 .
Itisalso compulsory formeters ,whether alone oraccompanied
byitems ofancillary equipment ,andforsub-assemblies incorporating
ameter when such equipment ismounted inmeasuring :systems constructed
outside the factory where they were manufactured .
3.2.1.2 .E2Cinitial verification ofameasuring system maybecarried out
inoneortwo stages .
3.2.1 .2.1 .Itiscarried out inone stage when the system isentirely manufactured
byasingle manufacturer ,when itcanbotransported without being
dismantled and when itisverified under the conditions inwhich it
isintended tobeoperated .
3.2.1 .2.2.Itiscarried out intwo stages inall other cases .
Thefirst stage concerns themeter only orthemeter fitted with any
ancillary equipment which must beassociated with it,whether ornot
incorporated inasub-assembly .
Thesecond stage concerns themeasuring system intheactual operating
state.
Itiscarried outinaplace selected bythe Iletrology Service
concerned when themeasuring system canbetransported without being
dismantled and the tests can bocarried out under the conditions in
which themeasuring system isintended tobeoperated .
Ifthese twoconditions arenotmet ,thesecond stage iscarried out
attheplace ofinstallation under operating conditions .

29-
3.2.2.Teststobecarriedout
3.2.2.1«Mienthetestsarecarriedoutintwostages:
Thefirststageconsistsof:
-anexternalexaminationoftheVolumetricmeter,includingany-
ancillaryequipment(conformitywiththerespectivepatterns);
-ametrological examinationofthevolumetricmeter,including
built-inancillaryequipment.
Thesecondstageconsistsof:
-anexternalexaminationofthemeasuringsystemincludingthe
volumetricmeterandancillaryequipment;
-ametrological examination ofthevolumetricmeterandancillary
equipmentinthemeasuringsystem;
-anoperatingtestonthegaseliminator ,ifthereisone;
-inspectionoftheadjustmentoftherequiredpressure-maintenance
devices;
-verification ofvariationsintheinternalvolumeofhosesin
full-hosesystems;
-determination ofresidualquantitiesinempty-hosesystems.
3.2.2.2.WhenEECinitialverificationiscarriedoutinonestage,thetests
referredtoin3.2.2.1.mustbeperformed.
3.2.2.3.Thefirst-stagetestsmaybecarriedoutonatestbench(possibly
inthemanufacturer'sfactory)orontheinstalledmeasuringsystem.
Themetrological examinations maythenbecarriedoutwithliquids
otherthanthoseforwhichthesyEtemisintended.
Thesecond-stagetestsmustbecarriedoutonthemeasuringsystem
intheplaceofinstallation andwiththeliquidthatthesystemis
intendedtomeasure.