IS 14439-1: Legal metrology - Gas volume meters, Part 1: General requirements

20 Pages·1997·2.2 MB·English

by  Bureau of Indian Standards

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timely dissemination of this information in an accurate manner to the public.
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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 14439-1 (1997): Legal metrology - Gas volume meters,
Part 1: General requirements [PGD 26: Weights and Measures]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

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Indian Standard
LEGAL METROLOGY — GAS VOLUME
METERS
PART1 GENERALREQUIREMENTS
ICS 17.120.10

@BIS 1997
BUREAU OF INDIAN STANDARDS
MANAKBHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

October 1997 PriceGroup 7
-. I i“”+
CommercialWeightsandMeasuresSectionalCommittee,LM06
FOREWORD
ThisIndianStandard(Part 1)wasadoptedbytheBureauofIndianStandards,afterthedraftfinalizedby
theCommercialWeightsandMeasuresSectionalCommitteehadbeenapprovedbytheLightMechanical
EngineeringDivisionCouncil.
Thisstandard prescribesthegeneralrequirementsapplicabletoalltypesofgasvolumemetersincluding
electronicgasmeters.Theadditionalrequirements,specifictoaparticulartypeofgasvolumemeter,are
beingspecifiedinseparatestandards coveringparticulartypeofgasvolumemeter.
Thestandardincludestheterminologyanddefinitionsapplicabletothegasvolumemeters.Italsocovers
theprovisionsrelatingto locationofverificationandprotection marksto detect/prevent anytempering
andtheprovisionsrelatingtopattern approvalformetrologicalcontrol.
ThecontentsofthisstandardhavebeenalignedwithOIMLRecommendation, OIMLR6:1989 ‘General
provisionsforgasvolumemeters’issuedbytheInternational OrganizationofLegalMetrology,France.
Thestandardongasvolumemetersiscurrentlybeingpublishedin3partsasfollows:
Part 1Generalrequirements,
Part2Diaphragmgasmeters,and
Part3Rotarypistonandturbinegasmeters.
Itisintendedtobring-outPart 4ofthisstandardinduecoursetocoverthe particular requirements for
ElectronicGasMeters.

Forthepurposeofdecidingwhetheraparticularrequirementofthisstandard iscompliedwith,the final
value,observedorcalculated,expressingtheresultofatestoranalysis,shallbercmndedoffinaccordance
withIS2: 1960‘Rulesfor rounding offnumericalvalues(revised)’.The number ofsignificantplaces
retainedintheroundedoffvalueshouldbethesameasthat ofthespecifiedvalueinthisstandard.
.

.
“
//
IS 14439(Part 1):1997
Indian Standard
LEGAL METROLOGY — GAS VOLUME
METERS
PART1 GENERALREQUIREMENTS
1 SCOPE 3.1 WorkingRangeofaGasVolumeMeter
This standard specifies the terminology, and The range of the flowrates of gaslimited bythe
general requirements applicable to gas volume maximumflowrate Qrnaxand the minimum flow
meters. rateQrnin.
2 REFERENCES 3.2 CyclicVolumeofaGasVolumeMeter (P’)
ThefollowingIndianStandardscontainprovisions
The volume ofgascorresponding to the working
which through reference in this text, constitute
cycleof the gasvolume meter, that is to all the
provision of this standard. At the time of
movements of the moving components which,
publication, the editions indicatedwerevalid. All
except for the indicating device and the
standards are subject to revision, and parties to
intermediate transmissions, resume for the first
agreementsbasedonthisstandardareencouraged
timethepositiontheyoccupiedatthebeginningof
to investigatethe possibilityofapplyingthe most
thecycle.
recenteditions ofthestandardsindicatedbelow
Thisvolumeisdeterminedbymultiplyingthevalue
ISNo. Title of the volume corresponding to one complete
revolution ofthe test element, or thevalueofthe
9000 Basic environmental testing
smallestscaleinterval,bythetransmissionratioof
procedures for electronic and
themeasuringdeviceto the indicatingdevice.
electricalitems:
(Part 2/See3): Coldtest, Section3Coldtest for 3.3 TestElement
1977 non-heat dissipating items with
gradualchangeoftemperature A device to enable precise reading of the gas
(Part 3/See5): Dryheat test, Section5Dryheat volume.
1977 testforheatdissipatingitemswith

3.4 MeteringConditions and BaseConditions
gradualchangeoftemperature

(Part 5/See2): Dampheat (cyclic)test,Section2 3.4.1 MeteringConditions
1981 12+12hcyclic
Conditions of the gas, volume ofwhich is to be
(Part 7/See3): Impact test, Section 3 Drop and
measured,atthepoint ofmeasurement (examples:
1979 topple
temperature andpressureofthemeasuredgas).
(Part 8): 1981 Vibration (sinusoidal)test
9001 Guidance for environmental 3.4.2 BaseConditions
testing
Conditionstowhichthemeasuredvolumeofgasis
(Part 2): Coldanddryheattests
converted (examples:base temperature and base
1977
pressure).
(Part 4): Dampheat test
NOTE—Meteringandbaseconditionsrelatetothevolume
1979 ofgastobemeasuredorindicatedontyandshouldnotbe
eonfuaedwith‘ratedoperatingconditions’and ‘referenee
NOTE —Referenee has alsobeen madeto certain IEC
conditions’, whichrefertoinflueneequantities.
publicationswheretheIndianStandardadonotexistonthe
subjectsatpresent.
3.5 ConversionDevice
3 TERMINOLOGY
A devicewhichconverts the volume measured at
For the purpose of this standard, the following the metering conditions to a volume at base
definitionsshallapply. conditions.
IS 14439(Part 1):1997
Thetypeofconversionmay 3.13 Intrinsic Error
a) temperature only,
The error of a gas meter used under reference
b) temperature andpressure,and
conditions.
c) temperature and pressure with cmrection
fordeviationsfromthe idealgaslaw. 3.14 Initial Intrinsic Error
3.6 WorkingPressure The intrinsic error of a gas meter as determined
prior to performance test and durability
Thedifferencebetweentheamolutepressure ofthe
evaluations.
gasto be measured at the inlet ofthe gasvolume
meter andatthe atmosphericpressure.
3.15 Fault
3.7 Pressure Absorption
Thedifferencebetweentheerror ofindicationand
The differencebetween the pressures at the inlet intrinsicerror ofagasmeter.
andoutlet ofthegasvolumemeterwhilethe gasis
NOTES
flowing.
1 Principallyafaultistheresultofanundesiredchangeof
NOTE—Insomegasvolumemetemthepressurerccovety datacontainedinorflowingthroughanelectronicgasmeter.
isnot completeattheoutlettlangeanditmaybe necessary 2 Fromthedefinitionitfollowsthata“fault”isaquantity
to measure the pressure absorption at a point in the withanumericalvalue.
downstream pipe. Ttds point shall be specified in the
standardparticulartothattypeofgasmeter. 3.16 SignificantFault
3.8 Output DriveConstant
3.16.1 A fault greater than 0.5 of the maximum
The value of the volume corresponding to one permissibleerror oninitialverification.
complete revolution of the shaft of the output
3.16.2 The followingfaults are considered not to
driv~ this value is determined bymultiplyingthe
be significant,even if they exceedthe significant
valueofthevolumecorrespondingtoone$nmplete
fault:
revolution ofthe test element bythe transmission
a) faults arising from simultaneous and
ratio ofthe indicatingdeviceto thisshaft.
mutually independent causes in the gas
3.9 Transitional Flowrate(@) meteritselforinitscheckingfacilities.
b) transitory faults being momentary
The flowrate at which the maximum permissible
variationsintheindication,whichcannotbe
error changesinvalue.
interpreted, memorised or transmitted asa
3.10 ElectronicGasMeter measurementresult.
Agasmeter equippedwithelectronicdevices. 3.17 DurabilityError
NOTE — For the purpose o f this standard auxiliaty
equipment,asfarapitissubjectto metrologicalcontrol,is The differencebetween the intrinsic error after a

cmsidered tobepartofthegasmeter,unlesstheauxilia~ periodofuseandtheinitial intrinsicerror ofagas
equipmentisapprovedandverifiedseparately.
meter.
3.11 ElectronicDevice
3.18 SignificantDurability Error
A device employing electronic components and
performingaspecificfunction. Electronic devices 3.18.1 The significantdurabilityerror isspecified
areusuallymanufacturedasseparate unitsandare intheparticular standard.
capableofbeingindependentlytested.
3.18.2 Durability errors are not relevant, even if
NOTE—Anelectronicdevice,asdefinedabovemaybe a theyexceedthe significantdurability error, where
completegaameterorpartofagasmeter.
the indications cannot be interpreted, memorized
3.12 Error (ofIndication) ortransmitted asmeasurement results.
‘,!
The indication of a gas meter minus the 3.19 InfluenceQuantity
(conventional) truevalueofthe measurand.
A quantity which is not the subject of the
NOTE—Errom(E)areexpreaaedinrefativevalueabythe
ratio (expressedasapercentage)ofthedifferencebetween measurementbutwhichinfluencesthevalueofthe
theindicatedvalue(Vi)andtheconventionaltruevalue(Vc) measurandor the indication ofthe gasmeter.
ofthevolumeoftheteatmediumwhichhaspassedthrough
thegssmeter,tothislattervalue 3.19.1 InfluenceFactor
n-v. An influence quantity having a value within the
E(%) =loo~
normaloperating conditions ofthe gasmeter.
2
-, . .. .. ...*.
1’1
IS14439(Part 1):1997
3.19.2 Disturbance 4 GENERALREQUIREMENTSFOR GAS
VOLUMEMETERS
Aninfluencequantitynotbeinganinfluencefactor.
4.1 FieldofApplication
3.20 Normal Operating Conditions
Theserequirementsapplytothefollowingtypesof
Conditions of use, givingthe range of values of gasvolume maters:
influence quantities for which the metrological a) Positive displacement gas meters
characteristics are intended to lie within the (volumetric gas meters): diaphragm gas
specifiedmaximumpermissibleerrors. meters,rotarypiston gasmeters.
b) Inferentialgasmeters: turbine gasmeters.
3.21 ReferenceConditions
NOTE—Inthisstandardgasvolumemetersarereferredto
A set ofspecifiedvaluesofinfluencefactorsf~ed as‘gasmeted.
to ensure valid intercomparison of results of 4.2 Construction
measurements.
4.2.1 General
3.22 Performance Gasmetersshallbedesignedandmanufacturedin
such a way that they do not exceed maximum
The ability of the gas meter to accomplish the
permissible errors under normal operating
intended functions.
conditions oftemperature asspecifiedin 10.2(a)
3.23 Durability andovertherangesoftemperature andpressureof
themeasuredgas(meteringcmditions) asclaimed
The ability of the gas meter to maintain its bythemanufacturer.
performancecharacteristicsoveraperiod ofuse.
4.2.2 Materials
3.24 CheckingFacility
Gas meters shall be made of sound materials
changinglittlewithageandsut%cientlyresistant to
Afacilitywhichisincorporated inagasmeterand
corrosionandto theattacksofthegasesforwhich
enablessignificantfaultsto bedetected and acted
the gasmeters are intended to be used and their
upon.
possiblecondensates.
NOTE—By‘actedupon’ismeantanyadequateresponse
bythegas meter. 4.2.3 SoundnessofCases
3,25 Durability Protection Feature Theeasesofgasmetersshallbegas-tightupto the
maximumworkingpressureofthe gasmeters.
Afeaturewhichisincorporated inagasmeterand
Ifmetersaretobeinstalledintheopenairtheyshall
which enables durability errors in excessof the
beimpermeabletorunoffwater.
significantdurabilityerrortobedetectedandacted
upon. 4.2.4 ProtectionAgainst Ertemal Interference

Gasmeter shallbe constructed in suchawaythat
3.26 Test
any mechanical interference capable of affecting
A series of operations intended to verify the the measuring accuracy results in permanently
compliance of the equipment under test (EUT) visible damage to the gas meter or to the
withcertainrequirethents. verificationmarkorprotection mark.
3,26.1 TestProcedure 4.2.5 Dkection oftheGas F1OW
Ongasmeterswheretheindicatingdeviceregisters
Adetailed description ofthe testoperations.
positivelyforonedirectiononlyofthegasflow,this
3.26.2 TestProgramme directionshallbeindicatedbyanarrow.Thisarrow
A description ofaseriesoftests foracertain type is not required if the direction of the gas flowis .1
determinedbytheecmstruction.
ofequipment. ,’
A protective devieemay also be provided which
3.26,3 Pe~ormance Test
would prevent the functioning of the gas meter
A test to verify whether the EUT is able to whenthegasflowisinthedirectionoppositetothat
accomplishitsintended functions. intended formeasuring.
3.26.4 Durability Test 4.2.6 Metrolo@calProperties
Atesttoveri~ whethertheEUTis abletomaintain At a f!owrateequal to ‘Q~~’a gasmeter shall be
itsperformancecharacteristicsoveraperiodofuse. abletofunctioncontinuouslyforatimefreedbythe
3
IS14439(Part 1): 1997
particular standard without the changes in its Ci (i = 1,2, ...n) represents the constant for the
metrological properties exceedingthe limits freed driveshaftcharacterizedbythe symbolML
bytheserequirements.
4.3.2.3 When not connected to an attachable
4.3 AdditionalDevices additional device,the exposed ends of the drive
shaftsshallbesuitablyprotected.
4.3.1 Gasmetersmaybefittedwith:
a) prepaymentdevices,
4.3.2.4 The cxxtnection between the measuring
b) integral pulse generators, the outlets of device and the intermediate gearing shallnot
whichshallbear an indication ofthevalue be broken or altered, if a torque .ofthree times
ofonepulseinthe form: the permissibletorque asindicatedin 4.3.2.1and
‘1im = ...m3(ordm3)’or 4.3.2.2isapplied.
#
‘1m = ...imp.’,
c) abuilt-in conversiondevice,and 5 MARKINGS
d) abuilt-in self-checking and possiblyself-
5.1 Each gasmeter shall bear, either on,the face
adjustingdevice.
plate, or on a special data plat~ the following
Thesedevicesare regardedasforminganintegral markings:
partofthegasmete~theyshallhavebeeninstalled a) he pattern approvalsignofthe gasmeter,
inthegasmeteratthetimeofpatternapprovaland ifappropriate,
initialverification. b) Themanufacturer’sidentificationmark
4.3.2 Gas meters maybe fitted with output drive c) The serialnumber ofthe gasmeter andits
shaftswhichshouldbetakentoincludedriveshafts yearofmanufacture,
or other facilities for operating detachable d) Thedesignationofthegasmetev thisdesig-
additionaldevices.Thetorquewhichthegasmeters nationisintheformofthecapitalletter ‘G’,
are required to produce in order to drive the followedbyanumberfixedintheparticular
additional devices fitted shall not produce any standard,
changesinthegasmeterindicationgreaterthanthe e) Themaximumflowrate ~- = ...m3/h,
specifiedvalues. f) Theminimumflowrate Q* = ...m3/h(or
dm3/h)
4.3.2.1 Ifthere is onlyone driveshaft,it shall be
characterizedbywtindicationofitsconstant (C)in g) The ~aximum working pressure Pm= =
kgkxn (orgtn/cm2),
theform”1Rev.= ...m3(ordm~”,ofthemaximum
h) For volumetric gas meters, the nominal
permissibletorque in the form“Mm= ...N.mm”.
value of the cyclicvolume V= ... m3(or
andofthe direction ofrotation.
dm~,
4.3.2.2 Ifthere are several d riveshatl.s,eachshaft j) The range of the metering coriditions in
shall be characterized by t h e letter ‘M’with which the gas meter is required to work
subscriptinthe form “Ml,Mz... Mn”,aswellasby within the specifiedmaximumpermissible
anindicationofitsconstantintheform”1rev.= ...
errors,expressedas:
m3(ordm3)”andofthedirectionofrotation.
tnl= .4.-... “C,
The following formula shall appear on the gas
Pm= ...- ...kg/cm2(orgmkrn~,
meter, preferablyonthedataplate
k) Ifrequira acommercialdesignationofthe
klMl+k2Mz+ ..........+k&. s A AJ.mm gasmeter,aspecialserialnumber,thename
of the gas distributor, the name of the
where
repairt?rahdtheyearofrepair.
‘A’ is the numerical value of the maximum
These markings shall be directly visible, easily
permissibletorque applied to the driveshaftwith
legiile and indeliile under normal conditions of
the highest constant, where the torque is applied
useofthegasmeters.
onlyto this shafi, this shaft shallbe characterized
bythe symbolMI,
!5.2The particular standard may prescribe other
ki(i = 1,2, ...n)isanumericalvaluedeterminedas markings, such as the nature of the gas to be
follows: measured
5.3 Without specialauthorization, the useofany
Li markingother than thoseprescrii inthepattern
approval document, unless required by other
Mi (i = 1,2, ...n)represents the torque applied to
national regulations,isprohibited.
the driveshaftcharacterizedbythe‘symbol.Mi,
4
,,
IS14439(F’art1):1997
6 INDICATINGDEVICESANDTEST 6.1.2 Mechanical IndicatingDevice
ELEMENT
6.1.2.1 A mechanical indicating device shall
6.1 Indicating Device
consistofdrums;the lastelement (that is,the one
6.LI GeneralRequirements withthesmallestscaleinterval)mayhoweverbean
exeeptionto thisrule.
6.L1.1 Gas meters shall be equipped with an
NOTE—Itappearsthatincertaindesigns,themandato~
indicatingdevieedirectlyindicatingthevolumeof
use of drums in mtAattical indkating devicescauaea,at
gasmeasured. present,greatinconvenience.Inconsequence,thesedeaigna
are, pti]onalfy, in need of requirements for indkating
Theindicatingdevieeshallindicate thevolumeof deviceswith pointem. It is recommended that for this
the measuredgasincubicmeters.llte symbol‘m3’ purposetheyapply totherequirementsinAnnexA.
shallappear onthe faceplate.
6.1.2.2 Where the indicating device includes
The scale intetval shall not exceed‘1m3’or the drums showingdeeimalsubmultiple ofthe cubic
volumepassedduringonehour atQtnin,whichever metre, these drums shall be separated by a clear
isthe greater. decimalsignfromthoseshowingettbicmetres. The
decades after the deeimal sign shall be clearly
6.1.1.2 Theindicatingdevicemaybe
distinguished from those in front of the decimal
a) amechanicalindicatingdeviceasmeant in
sign.
6.1.2,
b) an electromechanical or electronicin-
6.1.2.3 Where the last drum shows a decimal
dicatingdeviceasmeant in6.1.3, and
multipleofthecubicmetrt$thefaceplateshallbtxm
c) acombinatiomof (a)and,@).
a) either one (or two, or three, etc) fixed
6.1.1.3 The indicating devieeshall correspond to zero(s)afterthe lastdrum,
oneofthe followingpossibilities:
b) or the marking’ X 10’(or’ X 100’,or’ X
a) The gas meter has one indicating deviee
I@O’,etc),so that the reading isalwaysin
displaying the volume at meteringcon-
cubicmetrea.
ditions. Thesymbol‘r& shallappearonthe
faceplate, 6.12.4 A mechanicalindicating deviceshall have
b) The gas meter has two indicating devices, atleastasufficientnumberofdrumstoensurethat
onedisplayingthevolumeatmeteringcon- thevolumepw+?dduritig2000 hoursatmaximum
ditions, the other displayingthe volume at flowrate does not return all the drums to their
base conditions. The symbol‘m~shall ap initialpositions.
pear on the faceplate,accompaniedbythe
6.12S Thediameter ofthe drumsshallbeatleast
specification of those base conditions,ex-
pressedas: 16mm.

m= ..:C(or“K),
6.1.2.6 The advancebyone unit ofafigureofany
Pb = ...kg/em2(orgntktn~. order shall take placecompletelywhile the figure
ofanorder immediatelybelowpassesthrough the
Itshallbeclearandunambiguousastowhichofthe
lasttenth ofitseottrse.
indicatingdevicesthesemarkingsrelate.
NOTES 6.1.2.7 A mecltanieal indicating device shall be
I The valuea chosen for baseconditiomshatlpreferably easilyremovable if such removal is necessaryfor
be: WC,15°CorWCand0.0102 kg/em2.
verification.
2 Onedisplaymaybe usedforbothindicatioxw
c) A diaphragm gas meter with a built-in 6.1.3 Electromechanical or Electronic Indicating
temperature eonversion deviee may have
Lkvice
only one indicating deviee displaying the
volumeatbaseconditions.Thesymbol‘m% 6.1.3.1 Electromeehanierdorelectronicindicating
shallappear onthefaceplate, accompanied devices shall be nonresettable and shall be
bythespecificationofthebasetemperature, nonvolatile(that is,itmustbeabletoshowthelast
expressedas: correct indication after the devieehas recovered
h = ...”C fromaninterveningpowerfailure).
NOTE — The VdUeS chosen for base temperature ahatt
preferablybe tY’~15°CorWC 6.132 The provisions of 6.1.2.2, 6.1.2.3
and 6.1.2.4 are also applicable to electro-
6.1.1.4 The indicatingdevieeshallbesodesigned
mechanical and electronic indicatingdevices.
that the readingisbysimplejuxtaposition.
5

—
,’