英文《建筑给水排水及采暖工程施工质量验收规范》gb50242-2002

UDCNationalStandardofthePeople'sRepublicofChinaPGB50242-2002建筑给水排水及采暖工程施工质量验收规范CodeforAcceptanceofConstructionQualityofWaterSupplyDrainageandHeatingWorksIssuedonMarch152002ExecutedonApril12002JointlyPromulgatedbytheMinistryofConstructionandtheStateGeneralAdministrationforQualitySupervisionandInspectionandQuarantineofthePeople'sRepublicofChinaNationalStandardofthePeople'sRepublicofChina建筑给水排水及采暖工程施工质量验收规范CodeforAcceptanceofConstructionQualityofWaterSupplyDrainageandHeatingWorksGB50242-2002Compiledby:ConstructionDepartmentofLiaoningProvinceApprovedby:MinistryofConstructionoftheP.R.C.Executedon:April12002ChinaBuildingMaterialsIndustryPrintingHouse2002BeijingNoticeonIssuingtheNationalStandardoftheCodeforAcceptanceofConstructionQualityofWaterSupplyDrainageandHeatingWorksJ.B.[2002]NO.62DocumentPursuanttotheNoticeonthePrintingandDistributionofModificationPlansofNationalStandardsforEngineeringConstructionin1995~1996(J.B.[1997]NO.4),thisCodeforAcceptanceofConstructionQualityofWaterSupplyDrainageandHeatingWorksisrectifiedjointlybytheConstructionDepartmentofLiaoningProvinceandotherrelevantdepartments.OurministryhasarrangedfortheexaminationbyrelateddepartmentsoftheCodeandherebyapproveditasanationalstandardwiththeserialnumberofGB50242-2002andtobeeffectiveonApril12002.The3.3.2,3.3.16,4.1.2,4.2.3,4.3.1,5.2.1,8.2.1,8.3.1,8.5.1,8.5.2,8.6.1,8.6.3,9.2.7,10.2.1,11.3.3,13.2.6,13.4.1,13.4.4,13.5.3and13.6.1articleshereofarecompulsoryandmustbestrictlyandexactlyperformed.UpontheexecutionofthisCode,theoriginalCodeforQualityAcceptanceofHeatingandSanitaryEngineeringGBJ242-82andanyrelatedpartsinCodeforQualityInspectionandAcceptanceofBuildingHeatingandSanitaryandGasEngineeringGBJ302-88withrespectof"heatingandsanitaryengineering"shallbeabolishedandterminatedimmediately.AsregardsthisCode,theMinistryofConstructionoftheP.R.Cisresponsibleforitsadministrationandinterpretationwithrespecttotheaforementionedcompulsoryarticles,theRuralandUrbanConstructionCommissionofShenyangundertakestheinterpretationofandinconnectionwithdetailedtechnicalcontents,andthestandardquotainstituteundertheMinistryofConstructionarrangesforthepublishinganddistributionfromtimetotimebytheChinaBuildingMaterialsIndustryPrintingHouse.MinistryofConstructionoftheP.R.C.March152002TableofContentsTOC\o"1-8"\h\zHYPERLINK\l"_Toc35919628"1GeneralRulesPAGEREF_Toc35919628\h1HYPERLINK\l"_Toc35919629"错误！超级链接引用无效。HYPERLINK\l"_Toc35919630"3BasicRegulationsPAGEREF_Toc35919630\h5HYPERLINK\l"_Toc35919631"错误！超级链接引用无效。HYPERLINK\l"_Toc35919632"3.2ManagementofEquipmentandMaterialPAGEREF_Toc35919632\h5HYPERLINK\l"_Toc35919633"错误！超级链接引用无效。HYPERLINK\l"_Toc35919634"4InstallationofIndoorWaterSupplySystemPAGEREF_Toc35919634\h10HYPERLINK\l"_Toc35919635"错误！超级链接引用无效。HYPERLINK\l"_Toc35919636"4.2InstallationofWaterSupplyPipesandFittingsPAGEREF_Toc35919636\h11HYPERLINK\l"_Toc35919637"错误！超级链接引用无效。HYPERLINK\l"_Toc35919638"4.4InstallationofWaterSupplyEquipmentPAGEREF_Toc35919638\h13HYPERLINK\l"_Toc35919639"错误！超级链接引用无效。HYPERLINK\l"_Toc35919640"5.1BasicRegulationsPAGEREF_Toc35919640\h16HYPERLINK\l"_Toc35919641"错误！超级链接引用无效。HYPERLINK\l"_Toc35919643"5.3TheInstallationofRainDrainageSystemandItsAccessoriesPAGEREF_Toc35919643\h20HYPERLINK\l"_Toc35919645"错误！超级链接引用无效。HYPERLINK\l"_Toc35919646"6.1BasicRegulationsPAGEREF_Toc35919646\h22HYPERLINK\l"_Toc35919647"错误！超级链接引用无效。HYPERLINK\l"_Toc35919649"6.3TheInstallationofAccessoryPartsPAGEREF_Toc35919649\h23HYPERLINK\l"_Toc35919650"错误！超级链接引用无效。HYPERLINK\l"_Toc35919651"7.1TheBasicRegulationsPAGEREF_Toc35919651\h26HYPERLINK\l"_Toc35919652"错误！超级链接引用无效。HYPERLINK\l"_Toc35919654"7.3TheInstallationoftheWater-SupplyingFittingsoftheToiletEquipmentsPAGEREF_Toc35919654\h32HYPERLINK\l"_Toc35919656"错误！超级链接引用无效。HYPERLINK\l"_Toc35919659"8.TheInstallationoftheInsideHeatingSystemPAGEREF_Toc35919659\h36HYPERLINK\l"_Toc35919660"错误！超级链接引用无效。HYPERLINK\l"_Toc35919661"8.2TheInstallationofthePipesandTheirFittingsPAGEREF_Toc35919661\h36HYPERLINK\l"_Toc35919666"错误！超级链接引用无效。HYPERLINK\l"_Toc35919671"8.4TheInstallationoftheRadiatingBoardPAGEREF_Toc35919671\h41HYPERLINK\l"_Toc35919673"错误！超级链接引用无效。HYPERLINK\l"_Toc35919676"8.6TheWaterPressureExperimentsandtheDebuggingoftheSystemPAGEREF_Toc35919676\h42HYPERLINK\l"_Toc35919677"错误！超级链接引用无效。HYPERLINK\l"_Toc35919678"9.1TheBasicRegulationsPAGEREF_Toc35919678\h44HYPERLINK\l"_Toc35919679"错误！超级链接引用无效。HYPERLINK\l"_Toc35919685"9.3TheInstallationoftheJointingMachineoftheFireWaterPumpsandtheOutdoorsFireHydrantPAGEREF_Toc35919685\h48HYPERLINK\l"_Toc35919687"错误！超级链接引用无效。HYPERLINK\l"_Toc35919689"10TheInstallationoftheOutdoorsNetoftheDrainpipesPAGEREF_Toc35919689\h51HYPERLINK\l"_Toc35919690"错误！超级链接引用无效。HYPERLINK\l"_Toc35919691"10.2TheInstallationoftheDrainpipesPAGEREF_Toc35919691\h51HYPERLINK\l"_Toc35919693"错误！超级链接引用无效。HYPERLINK\l"_Toc35919695"11TheInstallationoftheOutdoorsNetofHeatingPipesPAGEREF_Toc35919695\h54HYPERLINK\l"_Toc35919696"错误！超级链接引用无效。HYPERLINK\l"_Toc35919697"11.2TheInstallationofthePipesandTheirFittingsPAGEREF_Toc35919697\h54HYPERLINK\l"_Toc35919699"错误！超级链接引用无效。HYPERLINK\l"_Toc35919700"错误！超级链接引用无效。HYPERLINK\l"_Toc35919701"12.1TheBasicRegulationsPAGEREF_Toc35919701\h58HYPERLINK\l"_Toc35919702"错误！超级链接引用无效。HYPERLINK\l"_Toc35919704"12.3TheInstallationoftheSwimmingPoolWaterSystemsPAGEREF_Toc35919704\h59HYPERLINK\l"_Toc35919705"错误！超级链接引用无效。HYPERLINK\l"_Toc35919706"13.1TheBasicRegulationsPAGEREF_Toc35919706\h60HYPERLINK\l"_Toc35919707"错误！超级链接引用无效。HYPERLINK\l"_Toc35919711"13.3TheInstallationoftheSupportingEquipmentsandthePipesPAGEREF_Toc35919711\h67HYPERLINK\l"_Toc35919718"错误！超级链接引用无效。HYPERLINK\l"_Toc35919721"13.5Baker,BoilerandtheExperimentalOperationPAGEREF_Toc35919721\h72HYPERLINK\l"_Toc35919723"错误！超级链接引用无效。HYPERLINK\l"_Toc35919725"14TheExaminationoftheQualityoftheSections(orSubsections)PAGEREF_Toc35919725\h75HYPERLINK\l"_Toc35919726"错误！超级链接引用无效。HYPERLINK\l"_Toc35919729"AppendixBPAGEREF_Toc35919729\h78HYPERLINK\l"_Toc35919733"错误！超级链接引用无效。HYPERLINK\l"_Toc35919736"AppendixDPAGEREF_Toc35919736\h81HYPERLINK\l"_Toc35919740"错误！超级链接引用无效。1GeneralRules1.0.1Forthepurposeofenhancingthemanagementofengineeringqualityandunifyingacceptancerulesonconstructionqualityofbuilding’swatersupplyanddrainageandheatingworkssoastoensureengineeringquality,thisCodeisherebymadeasfollows.1.0.2ThisCodeshallbeapplicabletothequalityacceptanceofwatersupplyanddrainageandheatingworksofbuildings.1.0.3Qualityacceptancerequirementsadoptedinallandanyengineeringtechnicaldocumentsandcontractingdocumentsforbuilding’swatersupplyanddrainageandheatingworksshallatleastattainthestipulationssetforthhereof.1.0.4ThisCodeshallbeusedincooperationwiththeUnifiedStandardforQualityAcceptanceofBuildingEngineeringGB50300thatiscurrentlyinforceandeffective.1.0.5Qualityacceptanceofbuilding’swatersupplyanddrainageandheatingworksshall,inadditiontothisCode,complywithotherrelatednationalcodesandstandardsthatarecurrentlyinforceandeffective.2DefinitionofTerms2.0.1WatersupplysystemAnetworktransmittingwatertotheconsumptionsitesthroughpipelinesandauxiliaryequipmentandfacilities,basedonthedistributingofbuildingsandthedemandofuser’sproduction,livingandfire-fightingdemands.2.0.2DrainagesystemAnetworktimelydrainingrainandwasteandpollutedwaterproducedindailylifeandproduction,throughpipelinesandauxiliaryequipmentandfacilities.2.0.3HotwatersupplysystemAnetworkconsistingofpipelinesandauxiliaryequipmentandfacilitiesforthepurposeoftransmittinghotwater,soastomeetpeople’sspecificrequirementsforwatertemperatureindailylifeandproduction.2.0.4SanitaryfixturesTheequipmentusedtomeetavarietyofsanitaryneedsinpeople’sdailylifeandtocollectanddischargesewageandindustrialwastewater.2.0.5WatersupplyfittingsAgeneraltermofavarietyofpipefittings,valvesandwaterfaucetsthatareusedinthewater(includinghotwater)supplysystemtoadjustanddistributethevolumeandpressureofwaterandcutoffandchangetheflowofwater.2.0.6IntermediatewatersystemofbuildingAtermreferstoallthewatersupplysystemsthatutilizethecoolingwateranddaily-lifedrainfrombathingandwashingasthesource,which,aftergoingthroughphysicalandchemicaltreatment,willbeusedintoiletsandforgardeningandplanting,washingcars,roadwatering,coolingofair-conditionersandsightseeingwaterfacilities.2.0.7AuxiliariesAlloftheequipmentinthewatersupplyanddrainageandheatingsystemsofbuildingsthatareestablishedforthepurposeofsatisfyingvarioususefunctionsofusersandimprovingtheoperatingquality.2.0.8TestpressureReferstothevalueofpressurethatthepipeline,vesselorequipmentisrequiredtoreachinacompressionstrengthorgas-tighttest.2.0.9RatedworkingpressureReferstothemaximumpermissibleoperatingpressureofaboilerorpressurevesselasdesignatedbythemanufacturer.2.0.10PipefittingsAgeneraltermdescribingavarietyofpartsandaccessoriesusedfortheconnectionamongpipesorpipesandequipment.2.0.11FixedtrestleReferstoakindofpipetrestleusedtopreventthepipeitsupportfrombothradialandaxialdisplacementatthesupportingpoint.2.0.12MovabletrestleReferstoakindofpipetrestlethatallowsthepipeitsupportstomovealongtheaxialdirection.2.0.13IntegrativeboilerAkindofboilerwhichisdeliveredafterthefinalassemblyiscompletedintheplantbasedonthepermissibleconditionsfortransportation.2.0.14BoilerwithoutbearingAkindoffixedboilerwhichutilizeswaterasthemedium,stipulatesawaterlevelfortheboilerbodythatisdirectlycontactingairduringoperation,andalwaysmaintainsitsworkingpressureatthevalueofairpressure.2.0.15SafetyaccessoryAllauxiliarymeters,valvesandcontroldevicesthatarenecessaryforensuringthesafeoperationofboilersandpressurevessels.2.0.16StillequipmentAnyequipmentinasystemthatitselfwillnotmovesduringthesystem’soperation,includingwatertanksandothertanksandcontainers.2.0.17Household-basedheatmeteringThemeteringmodeunderwhichthevolumeofheatprovidedismeasuredbasedoneveryhousehold.2.0.18HeatmeteringdeviceAsetofmetersanddevicesmeasuringthetransfervolumeofheatmedium.2.0.19CompressionjointAkindofjoiningmodeunderwhichspecialjointscomprisingcapnutsandscrewthreadpipefittingsareusedfortheconnectionamongpipes.2.0.20Fire-resistingsleevesReferstoakindofshorttubethatismadeofrefractorymaterialsandflameretardantandcoveredtheoutsidewallofstiff-plasticdrainagepipes,forthepurposeofpreventingthefamefromspreadingalongthepipe.2.0.21FirestopscollarAkindofcollarthatismadeoffireretardantexpansiveagentandusedtocovertheoutsidewallofstiff-plasticdrainagepipes,soastopreventthefirefromspreadingbecauseitsfunctionofblockingthepipesattheoccurrenceoffireaccidents.3BasicRegulations3.1QualityManagement3.1.1Allandeverysiteofwatersupplyanddrainageandheatingworksofbuildingsmusthavenecessarytechnicalstandardsforconstruction,anoptimizedandhealthfulqualitymanagementsystemandthemechanismforqualityinspection,soastoperformanoverallprocessofqualitycontrol.3.1.2Theconstructionofbuilding’swatersupplyanddrainageandheatingworksshallbeexecutedinaccordancewiththeapprovedengineeringdesigndocumentsandtechnicalstandardsforconstruction.Anymodificationorchangeofdesignsshallbesubjecttothechangenoticeissuedbythedesignorganization.3.1.3Priortoethebeginningofconstruction,adesignorconstructionschemeoftheconstructionorganizationshallbepreparedandapproved.3.1.4Theclassificationofpartitionedanddivisionalworksofbuilding’swatersupplyanddrainageandheatingworksisdetailedinScheduleA.3.1.5Thedivisionalworksofbuilding’swatersupplyanddrainageandheatingworksshallbedividedinaccordancewiththesystem,area,constructionsectionorfloor.Acceptanceofdivisionalworksshallbecarriedoutbasedondifferentinspectionlots.3.1.6Anyunitundertakingtheconstructionofwatersupplyanddrainageandheatingworksofbuildingsshallhavecorrespondingqualification,withitsqualityinspectorhavingrelevantprofessionaltechnicalqualification.3.2ManagementofEquipmentandMaterial3.2.1Allkeymaterials,finishedandsemi-finishedproducts,accessoriesandparts,apparatusandequipmentusedinwatersupplyanddrainageandheatingworksofbuildingsmustbedeliveredtogetherwiththeChinesequalitycertificatesofconformity.Anyspecification,modelandperformanceinspectionreportsthereofshallcomplywithrelevantnationalstandardsorthedesignrequirements.Beforedeliveringintotheconstructionsite,theyshallbeinspectedforacceptanceandconfirmedbythesupervisionandmanagementengineer.3.2.2Inspectionandacceptanceshallbemadeforallmaterialsintermsofthevariety,specificationandappearance.Thepackagingshallbeingoodcondition,withoutanyscratchonthesurfaceanddamageandbreakagecausedbyexternalforce.3.2.3Installationandoperationinstructionsshallbeprovidedforkeydevices,apparatusandequipment.Effectivemeasuresshallbetakentopreventpossibledamageandlossesorcorrosioninthecourseoftransportation,keepingandconstruction.3.2.4Priortotheinstallationofvalves,strengthandgas-tighttestsshallbecarriedout.Suchtestsshallcover10%ofeverybatchofvalves(withthesamedesignation,modelandspecification),whichshallatleastbeonevalve.Forthosetripandstopvalvesinstalledonmainandarterialpipes,thestrengthandgas-tighttestsshallbecarriedoutforeverysuchvalves.3.2.5Thestrengthandgas-tighttestsofvalvesshallmeetthefollowingrequirements:thestrengthtestpressureshallbe1.5timesofthenominalvalue;thegas-tighttestpressureshallbe1.1timesofthenominalvalue;thetestpressureshallstayunchangedinthedurationoftest,andnoleakageshallbefoundintheshellfillingandonthevalveclack’ssealingsurface.ThedurationofthevalvepressuretestshallatleastmeetthestipulationsinTable3.2.5.Table3.2.5DurationofvalvetestNominaldiameterDN(mm0Minimumdurationoftest(s)Gas-tighttestStrengthtestMetalsealingNon-metalsealing≤5015151565-200301560250-45060301803.2.6Ifastampingelbowisusedonthepipe,theelbow’soutsidediametershallbeequivalenttothatofthepipe.3.3QualityControlofConstructionProcess3.3.1Betweenthewatersupplyanddrainageandheatingworksofbuildingsandrelatedspecialfields,hand-overqualityinspectionshallbemade,togetherwithrelatedrecords.3.3.2Anyconcealworkcanbeconcealedonlyaftertheacceptanceandapprovalbyrelatedparties,andrecordsthereofshallbemade.3.3.3Anybasementorsub-structurewithitsexteriorwallpassedthroughbypipesmusthavewaterproofmeasures.Asregardthebuildingthathasstrictwaterproofrequirements,flexiblewaterstringsmustbeusedforthepipes.3.3.4Intheeventthatthepipeispassthroughtheexpansion,aseismaticand/orsettlementjoint,anyorallofthefollowingprotectivemeasuresshallbetakenbasedonactualconditions:Flexibleconnectiontakenateachsideofthewall.Leaveaclearanceofatleast150mmaboveandbelowtheoutsidesurfaceofthepipeorinsulatinglayer.Madeintoasquarecompensatoratthepassingpointandinstallithorizontally.3.3.5Allheatingequipment,sanitarywareandpipefittingsofthesametypeinthesameroomshallbeinstalledatthesameheight,unlessotherwisespeciallyrequired.3.3.6Whenopenpipesareinstalledinrows,thestraightlinesectionshallbeparallel.Asregardsthecurvesections:whenthepipesareparallelhorizontallyorvertically,theyshallremainthesamespacing;whenthepipesareparallelhorizontallyandatdifferentheights,theradiusofcurvatureofthecurvesectionsshallremainthesame.3.3.7Theinstallationofthepipe’strestle,hangerandbracketshallcomplywiththefollowingstipulationshereunder:Thepositioniscorrect,andthelayingshallbeflatandsolid.Thefixedtrestleshalltightlycontactthepipeandfixedsolidly.Themovabletrestleshallbeflexible,witha3~5mmclearanceremainingbetweenthesupportandslideway,andthelongitudinalamountofmovementshallmeetthedesignrequirements.Allhangersandsuspensionrodswithoutthermalelongationshallbeinstalledvertically.Anyhangerandsuspensionrodwiththermalelongationshallbeoffsetinthereversedirection.Thetrestlesandhangersfixedonthestructuremustnotaffectthestructure’ssafety.3.3.8ThespacingamongthetrestlesandhangersofhorizontallyinstalledsteelpipesshallnotexceedthestipulationsinTable3.3.8.Table3.3.8MaximumspacingbetweentrestlesofsteelpipesNominaldiameter(mm)1520253240507080100125150200250300Max.trestlespacing(m)Insulatedpipe22.52.52.533444.567788.5Non-insulatedpipe2.533.544.55666.5789.511123.3.9Thespacingbetweenthetrestlesforplasticandcladpipesusedintheheating,waterandhotwatersupplysystemsshallcomplywiththerequirementsofTable3.3.9.Non-metalcushioningorsleevesshallbeplacedbetweenthepipeandthetrestlesmadeofmetalmaterial.Table3.3.9MaximumspacingbetweentrestlesofplasticandcladpipesPipediameter(mm)121416182025324050637590110Max.spacing(m)Vertical0.50.60.70.80.91.01.11.31.61.82.02.22.4HorizontalColdwater0.40.40.50.50.60.70.80.91.01.11.21.351.55Hotwater0.20.20.250.30.30.350.40.50.60.70.83.3.10ThespacingbetweentrestlesofverticallyorhorizontallyinstalledcopperpipesshallmeettherequirementsasstipulatedinTable3.3.10.Table3.3.10MaximumspacingbetweentrestlesofcopperpipesNominaldiameter(mm)1520253240506580100125150200Max.trestlespacing(m)Verticalpipe1.82.42.43.03.03.03.53.53.53.54.04.0Horizontalpipe1.21.81.82.42.42.43.03.03.03.03.53.53.3.11Theinstallationofpipeclampsofmetalstandpipesintheheating,waterandhotwatersupplysystemsshallcomplywiththefollowingrequirements:Atleastoneclampmustbeinstalledforeachfloorthathasaheightof5morless.Atleasttwoclampsmustbeinstalledforeachfloorthathasaheightofover5m.Theinstallationheightofclampsshallbe1.5~1.8mabovetheground.Twoormoreclampsshallbeinstalledsymmetricallyandatthesameheightinthesameroom.3.3.12Pipesandpipepiers(abutments)mustnotbelaidonfrozenearthoruntreatedloosesoil.3.3.13Metalorplasticsleevesshallbeequippedwiththepipespassingthroughwallsandfloorslabs.Asforthesleeveinstalledwithinthefloorslab,itssuperfaceshallbe20mmabovethedecorativeplane;asforthesleeveinstalledinthetoiletandkitchenroom,itsuppersurfaceshallbe50mmabovethedecorativeplaneanditsbottomsurfaceshallbeonthesameelevationwiththefloorslab’sunderside;andasforthesleeveinstalledinsidethewall,itsendsshallbeflatwiththewall’sdecorativesurface.Thegapbetweenthesleeveandpipepassingthroughthefloorslabshallbefilledandcompactedwithfireretardant,withtheendfacebeingsmooth.Thejointbetweenpipesmustnotbepositionedwithinthesleeve.3.3.14Asregardsbendingsteelpipes,thebendingradiusshallcomplywiththefollowingrequirements:Hotbending:notsmallerthan3.5timesofthepipe’soutsidediameter.Coldbending:notsmallerthan4timesofthepipe’soutsidediameter.Weldedelbow:notsmallerthan1.5timesofthepipe’soutsidediameter.Stampingelbow:notsmallerthanthepipe’soutsidediameter.3.1.15Jointsofpipesshallcomplywiththefollowingrequirements:Forapipeusingadhesivebondedjoint,thedepthofinsertedpipeendintothebellmouthshallatmeettherequirementsasshowninTable3.3.15.Table3.3.15InsertiondepthofpipeendintobellmouthNominaldiameter(mm)202532405075100125150Inserteddepth(mm)161922263144616980Thejoiningplaneofweldedpipesshallhaveuniformweldingloops,onwhichneitherweldingnubsnorscraggysurfacesareallowedtoappear.Asforthepipesjoinedbyrubberrings,itisallowedtolaythemalongacurve,withthemaximumangleofdeflectionnotexceeding2.Whenadoptingflangedconnection,thegasketmustnotbeprojectedintothepipe,withitsoutsideedgeclosingtothebolthole.Doublegasketsanddeviationofgasketnotallowed.Asregardstheboltconnectingflanges,itsdiameterandlengthshallcomplywithstandards.Afterbeingtightened,theprotrudednut’slengthshallnotexceed1/2ofthebolt’sdiameter.Aftertheinstallationofthreadconnectionpipes,2~3ringsshallberemainedattherootofpipethread,andtheremainingringsshallberemovedandcleanedforanti-corrosiontreatment.Ifusingcementtotwistthebellsocket,thebatchedjutemustbecleanandcompacted,andcementshallbetwistedintothebellmouthandcompacted,withthedepthofinsertionintothebellmouthnotexceeding2mm.Asforthepipesusingyoke(housing)connection,thepipeendsshallbeflatandfreefromgaping,andthefurrowshallbeuniform.Afterchuckingthebolts,thepipelineshallbestraightandtheinstallationdirectionofyokes(housing)shallbeinoneline.3.3.16Watertestsmustbemadeforallkindsofpressurepipesystemsandequipment,whilewateringtestsfornon-pressurepipesystemsandequipment.4InstallationofIndoorWaterSupplySystem4.1BasicRegulations4.1.1Thischapterisapplicabletoqualit