BS 1968-1953 Specification for floats for ballvalv

BRITISHSTANDARDBS1968:1953IncorporatingAmendmentNos.1and2SpecificationforFloatsforballvalves(copper)CONFIRMEDDECEMBER2007BS1968:1953ThisBritishStandard,havingbeenapprovedbytheSanitaryAppliancesIndustryStandardsCommitteeandendorsedbytheChairmanoftheBuildingDivisionalCouncil,waspublishedundertheauthorityoftheGeneralCouncilon8May1953©BSI10-1999ISBN0580355799Co-operatingorganizationsTheSanitaryAppliancesIndustryStandardsCommittee,underwhosesupervisionthisBritishStandardwasprepared,consistsofrepresentativesfromthefollowingGovernmentdepartmentsandscientificandindustrialorganizations:AdmiraltyMetalSinkManufacturers’AssociationBritishBathManufacturers’AssociationMinistryofHousingandLocalGovernment*BritishIronfounders’Association*MinistryofWorks*BritishPlasticsFederationNationalBrassfoundryAssociation*BritishSanitaryEarthenwareManufacturers’NationalFederationofBuildingTradesAssociationEmployersBritishSanitaryFireclayAssociationNationalGeneralExportMerchantsGroupBritishWaterworksAssociation*RoyalInstituteofBritishArchitects*D.S.I.R.—BuildingResearchStation*RoyalInstituteofCharteredSurveyorsFlushingCisternMakers’Association*RoyalSanitaryInstitute*InstituteofPlumbers*SanitaryInspectors’AssociationInstitutionofMunicipalEngineers*ScottishFederationofPlumbersandDomesticInstitutionofSanitaryEngineersEngineers(Employers)AssociationsLondonCountyCouncilWaterCompaniesAssociation*TheGovernmentdepartmentsandscientificandindustrialorganizationsmarkedwithanasteriskintheabovelist,togetherwiththefollowing,weredirectlyrepresentedonthecommitteeentrustedwiththepreparationofthisBritishStandard:—AssociatedMasterPlumbersandDomesticCrownAgentsfortheColoniesEngineersDistributorsofBuilders’SuppliesJointCouncilAssociationofHeating,VentilatingandElectricWaterHeaterManufacturers’DomesticEngineeringEmployersAssociationBritishElectricalDevelopmentAssociationInstituteofBritishFoundrymenBritishElectricalandAlliedManufacturers’InstitutionofGasEngineersAssociationInstitutionofHeatingandVentilatingBritishNon-FerrousMetalsResearchEngineersAssociationInstitutionofWaterEngineersBuildingIndustriesNationalCouncilLondonChamberofCommerceB.W.A.LicenseesAssociationMetropolitanWaterBoardCopperBallManufacturers’AssociationSocietyofBritishGasIndustriesCopperTubeFittingsManufacturers’UrbanDistrictCouncil’sAssociationAssociationAmendmentsissuedsincepublicationAmd.No.DateofissueComments3220November19584667September1962IndicatedbyasidelineinthemarginBS1968:1953©BSI10-1999iContentsPageCo-operatingorganizationsInsidefrontcoverForewordii1Scope12Definitions13General14Materials15Jointingofcopperfloats16Floatsotherthanspherical27Bossesandfitments28Tolerances29Tests210Marking2AppendixInformationtobesuppliedbythepurchaser3Table1—Sphericalcopperfloats4Table2—ClassificationofbossesforusewithclassesA,BandCfloats5Table3a—BossesforclassesAandCfloatswithsolderedandbrazedjoints6Table3b—BossesforclassBfloatswithsolderlessjoints7Table4—WeightofbossforclassesAandCfloatsandofbossandfitmentsforclassBfloats8Table5—Assembledweightofsphericalcopperfloatsincludingsolderorotherjointingmaterial8BS1968:1953ii©BSI10-1999ForewordThisstandardmakesreferencetothefollowingBritishStandards:—BS84,ScrewthreadsofWhitworthform.BS218,Brassbarsandsections(suitableforforging)anddropforgings.BS219,Softsolders.BS427,Tablesofdiamondpyramidhardnessnumbers.BS899,Coldrolledcoppersheetsandstrip(half-hardandannealed)forgeneralpurposes.BS1212,Ballvalves(“Portsmouth”type)excludingfloats.BS1400,Copperalloyingotsandcastings.BS1845,Filleralloysforbrazing(silversoldersandbrazingsolders).ThisBritishStandardspecifiesrequirementsforcopperfloatsforusewithballvalvesandhasbeenissuedtofacilitatethemanufacture—asseparateitems,tobepurchasableassuch—offloatssuitableforballvalvescomplyingwiththerequirementsofBS1212,“Ballvalves(“Portsmouth”type)”andothertypesofballvalverequiringfloatsofthisdescription.ReferenceshouldbemadetoBS1212forpermissiblealternativetypesoffloatforusewithballvalvescomplyingwiththatspecification.Forinformationregardingthecorrectsizeoffloattouseforaparticularsizeofballvalve,orrangeofpressure,wheretheleverageexertedisnotlessthanthatspecifiedinBS1212,referenceshouldbemadetoTable2ofthisstandardandalsotoBS1212.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesiandii,pages1to8,aninsidebackcoverandabackcover.Thisstandardhasbeenupdated(seecopyrightdate)andmayhavehadamendmentsincorporated.Thiswillbeindicatedintheamendmenttableontheinsidefrontcover.BS1968:1953©BSI10-199911ScopeThisBritishStandardspecifiesrequirementsforarangeofsphericalcopperfloatsof41/2,5,6,7,8,9,10,11and12inchesnominaldiametersuitableforattachmenttotheballvalvesspecifiedinBS1212andtoballvalvestheleverageofwhichforthesameboreofseatisnotlessthanthatspecifiedinBS1212,inthefollowingclasses:—ClassA.Floatsofallsizeswithsol