BRITISHSTANDARDBS3463:1975SpecificationforObservationandgaugeglassesforpressurevesselsUDC666.11.025:621.183.31:681.128:621.642:66.023BS3463:1975ThisBritishStandard,havingbeenapprovedbytheGlassIndustryStandardsCommittee,waspublishedundertheauthorityoftheExecutiveBoardon31October1975©BSI07-1999FirstpublishedJanuary1962FirstrevisionOctober1975ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceGLC/4Draftforcomment73/52683ISBN0580086364Co-operatingorganizationsTheGlassIndustryStandardsCommittee,underwhosesupervisionthisBritishStandardwasprepared,consistsofrepresentativesfromthefollowingscientificandindustrialorganizations.BritishGlassIndustryResearchAssociationBritishLampblownScientificGlasswareManufacturers’AssociationBritishPlasticsFederationDepartmentoftheEnvironmentFlatGlassManufacturers’Association*GlassManufacturers’FederationScientificInstrumentManufacturers’AssociationSocietyofGlassTechnologyUniversityofSheffield(DepartmentofGlassTechnology)Theindustrialorganizationmarkedwithanasteriskintheabovelist,togetherwiththefollowing,wasdirectlyrepresentedonthecommitteeentrustedwiththepreparationofthisBritishStandard:BritishValveManufacturers’AssociationChemicalIndustriesAssociationCouncilofBritishManufacturersofPetroleumEquipmentDepartmentofTradeElectricitySupplyIndustryinEnglandandWalesEngineeringEquipmentUsers’AssociationInstitutionofMechanicalEngineersSocietyofChemicalIndustryAmendmentsissuedsincepublicationAmd.No.DateofissueCommentswww.bzfxw.comBS3463:1975©BSI07-1999iContentsPageCo-operatingorganizationsInsidefrontcoverForewordiiiSection1.General11Scope12References13Definitions14Marking1Section2.Tubularglassesforlevelgauges25Material26Qualityofglass27Dimensions28Finishofends29Straightness210Ovality211Thermalshockrequirements2Section3.Protectorglassesfortubulargaugeglasses212Material213Qualityofglass214Dimensions215Finishofedges316Inspectionunderpolarizedlight317Thermalshockrequirements3Section4.Through-visionandreflexglasses318Material...