MSSSP432008锻制不锈钢对焊管件

MSSSP-43-2008WroughtandFabricatedButt-WeldingFittingsforLowPressure,CorrosionResistantApplicationsStandardPracticeDevelopedandApprovedbytheManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.127ParkStreet,NEVienna,Virginia22180Phone:[phone]Fax:[phone]Email:[e-mail](s)atthedateofissueofthisMSSSP.(SeeAnnexA).Thisdocumenthasbeensubstantiallyrevisedfromtheprevious1991(R2001)edition.Itissuggestedthatiftheuserisinterestedinknowingwhatchangeshavebeenmade,thatdirectpage-by-pagecomparisonshouldbemadeofthisdocumentwiththepreviousedition.AnypartofthisStandardPracticemaybequoted.Creditlinesshouldread'Extracted432008fromMSSSP-,,withpermissionofthepublisher,theManufacturersStandardizationSociety.'ReproductionprohibitedundercopyrightconventionunlesswrittenpermissionisgrantedbytheManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.OriginallyApprovedOctober,1950Copyright1982byManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.PrintedinU.S.A.MSSSTANDARDPRACTICESP-43iiFOREWORDASMEB16.9istheAmericanStandardforsteelbutt-weldingfittingsandalthoughnotsostated,itisimpliedthatitsscopedealsprimarilywiththeschedulesofwallthicknesseswhicharecommontocarbonsteelandthegradesofalloysteelpipingthatareselectedforpressureandtemperatureconsiderations.Therapidexpansionoftheprocessindustriesinthefieldofchemicals,plastics,textiles,etc.,hascreatedademandforaclassofpipereferredtoasstainlesspiping,usingthiswordinitsgenericsense.Thisfieldemploystheuseoftheausteniticstainlesssteelsandalsonickelanditsrelatedalloys.Thisstainlesspipingisusedwithresistancetocorrosion,eliminationofproductcontamination,orcombinationofthetwoastheprinciplereasonformaterialselection.Pressureisseldom,ifever,acriticalconsideration.WhenpressureisaconsiderationreferenceismadetoASMEB16.9.Mechanicalstrength,resistancetovacuum,andeconomy,arethemostusualcriteriaintheselectionofpipethicknessinthisfield,andforthisreasonthewallthicknessesemployedinthefieldofcorrosionresistantpipearelighterthanthoseincommonusagewithcarbonsteelpiping.In1949ANSIapprovedstandardB36.19StainlessSteelPipeinwhichascheduleofwallthicknesswasestablishedanddesignatedasSchedule10S.NumerouscompanieswerealsousingawallthicknesslighterthanSchedule10Sforserviceswherecontaminationratherthancorrosionwastheprimeconsideration.TheselighterwallthicknessesweredesignatedSchedule5Sandtheoriginal1950editionofSP-43establishedaseriesofSchedule5Sfittings.The5SthicknesseswerepublishedinSP-43andweredevelopedincooperationwithrepresentativesofthevariousprincipalchemicalcompaniesandprocessingindustries.In1952theStainlessSteelPipeStandardB36.19wasrevisedtorecognizetheSchedule5SwallthicknesspipeasAmericanStandard.ThepurposeofthisStandardPracticeistoprovideindustrywithasetofdimensionalstandardsforbutt-weldingfittingsthatcanbeusedwiththeselightwallpipesofcorrosionresistingmaterials.Thecenter-to-enddimensionsofallfittingsareidenticalwiththoseinASMEB16.9whichgivetoindustrytheadvantageofuniformdesignroompracticeandamaximumutilizationofexistingdieequipment.Theonlydeparturefromthisisinthelap-jointstubendwhereforpurposesofeconomytheface-to-endoftheproducthasbeenreducedforusewiththinwallpiping.Theadvantageoflongercenter-to-enddimensionsofthesize3/4elbowsresultedinthechangeinthetablestopermitagradualchangeover,providingthemanufacturersampletimetodepleteexistingstocks,re-toolandreplenishstocks.The1991revisionoftheSPwasrequiredtodeletethemetricequivalents.The2001Reaffirmationhadnotechnicalchanges.Therewereminoreditorialchanges.Theprecedenceofthelongerdimensionsfor3/4elbowswasmadeinaccordancewithASMEB16.9.Referencedstandardswerebroughtuptodate.Thetitleof180degreereturnswasclarified.Inthis2008edition,aminimalpressureratingisestablishedtocorrespondwiththeASTMCRdesignation.MSSSTANDARDPRACTICESP-43iiiTABLEOFCONTENTSSECTIONPAGE1SCOPE.............................................................................................................................................12REFERENCES................................................................................................................................13PRESSURERATINGS......................................................................