MSS SP-117-2006 Bellows Seals for Globe and Gate V

MSSSP-117-2006:[phone]Fax:[phone]e-mail:[e-mail]ndGateValvesMSSCopyrightMSSProvidedbyIHSunderlicensewithMSSNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,,```,,,,````-`-`,,`,,`,`,,`---MSSSTANDARDPRACTICESP-117iThisMSSStandardPracticewasdevelopedundertheconsensusoftheMSSTechnicalCommittee114andtheMSSCoordinatingCommittee.ThecontentofthisStandardPracticeistheresultoftheeffortsofcompetentandconcernedvolunteerstoprovideaneffective,clear,andnon-exclusivespecificationthatwillbenefittheindustryasawhole.ThisMSSStandardPracticeisintendedasabasisforcommonpracticebythemanufacturer,theuser,andthegeneralpublic.TheexistenceofanMSSStandardPracticedoesnotinitselfprecludethemanufac-ture,sale,oruseofproductsnotconformingtotheStandardPractice.Mandatoryconformanceisestablishedonlybyreferenceinacode,specification,salescontract,orpubliclaw,asapplicable.UnlessotherwisespecificallynotedinthisMSSSP,anystandardreferredtohereinisidentifiedbythedateofissuethatwasapplicabletothereferencedstandard(s)atthedateofissueofthisMSSSP.(SeeAnnexB.)InthisStandardPracticeallnotes,annexes,tables,andfiguresareconstruedtobeessentialtotheunderstandingofthemessageofthestandard,andareconsideredpartofthetextunlessnotedassupplemental.Allappendi-cesappearinginthisdocumentareconstruedassupplemental.Supplementalinformationdoesnotincludemandatoryrequirements.Substantivechangesinthis2006editionare“flagged”byparallelbarsasshownonthemarginsofthisparagraph.Thespecificdetailofthechangemaybedeterminedbycomparingthematerialflaggedwiththatinthepreviousedition.Anypartofthisstandardmaybequoted.Creditlinesshouldread`extractedfromMSSSP-117,2006withpermissionofthepublisher,theManufacturersStandardizationSociety.'ReproductionprohibitedundercopyrightconventionunlesswrittenpermissionisgrantedbytheManufacturersStandardizationSocietyoftheValveandFittingsIndustryInc.OriginallyApprovedApril,1996Copyright©,1996byManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.PrintedinU.S.A.CopyrightMSSProvidedbyIHSunderlicensewithMSSNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,,```,,,,````-`-`,,`,,`,`,,`---MSSSTANDARDPRACTICESP-117iiTABLEOFCONTENTSSECTIONPAGE1SCOPE.................................................................................................................................................12MARKING..........................................................................................................................................13DESIGN...............................................................................................................................................14INSPECTIONANDTEST..................................................................................................................35SHIPPINGINFORMATION...............................................................................................................46ORDERINGINFORMATION............................................................................................................4FIGURE1─TypicalBellowsStemSealArrangement....................................................................5ANNEXA─Definitions..................................................................................................................6ANNEXB─ReferencedStandardsandApplicableDates..............................................................7CopyrightMSSProvidedbyIHSunderlicensewithMSSNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,,```,,,,````-`-`,,`,,`,`,,`---MSSSTANDARDPRACTICESP-1171BellowsSealsforGlobeandGateValves2.MARKING2.1Valvesutilizingbellowssealsshallhaveacorrosion-resistantmetalidentificationplatesecurelyattached,givingthefollowinginformation:a)BellowssealperMSSSP-117b)BellowsMaterial:(insertactualbellowsmaterial)Note:Iftheparentvalveelevatedpressure-tempera-tureratingistobederatedorservicetemperaturelimitedduetobellowsdesignlimitations,anybellowsratedlimitationstotheparentvalvepressure-tempera-tureratingshallbemarkedasrequiredbytheparentvalvespecification.3.DESIGN3.1General3.1.1Thepurposeofthebellowssealistoprovideametalbarrierbetweenthestematitspointofentrythroughthepressureboundaryandtheprocessfluidwithinthevalvetoeliminatestemleakage.Thebellowssealisnotintendedtobeastructuralmemberofthevalvenorisitconsideredtobetheultimatepressurecontainingmechanismofthevalve.Thus,thebellowssealistobedesignedinconjunctionwithandnotasasubstitutefortheconventionalpressureboundarycomponentsnormallyrequired.SeeFigure1foranexampleofatypicalvalveassemblywithbellowsseal.3.1.2Becauseaconventionalpressureboundarymechanismisavailabletoactastheultimatepressurecontainingmechanism,latitudeispermittedinthedesignofbellowssealssolongastheysatisfytheperformanceandallotherrequirementsofthisStandardPractice.3.1.3Exceptasspecifical