MSS SP-9-2001 青铜、铁和钢制法兰的孔口平面

STD-MSSSP-9-ENGL2001=5770b1iU0501434191=MSSSP-9-2001SpotFacingForBronze,IronandSteelFlangesStandardPracticeDevelopedandApprovedbytheManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.127ParkStreet,NEVienna,Virginia22180(703)281-6613CopyrightMSSProvidedbyIHSunderlicensewithMSSNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,,,,,-`-`,,`,,`,`,,`---()STD-MSSSP-’I-ENGLZiJûl,5770b’iUUSOL1i35ô28mSTANDARDPRACTICESP-9MSSThisMSSStandardPracticewasdevelopedundertheconsensusoftheMSSTechnicalCommittee102,110,201,andtheMSSCoordinatingCommittee.ThecontentofthisStandardPracticeistheresultoftheeffortsofcompetentandconcernedvolunteerstoprovideaneffective,clear,andnon-exclusivespecificationthatwillbenefittheindustryasawhole.ThisMSSStandardPracticeisintendedasabasisforcommonpracticebythemanufacturer,theuser,andthegeneralpublic.TheexistenceofanMSSStandardPracticedoesnotinitselfprecludethemanufacture,sale,oruseofproductsnotconformingtotheStandardPractice.Mandatorycon-formanceisestablishedonlybyreferenceinacode,specification,salescontract,orpubliclaw,asapplicable.ISubstantivechangesinthe2001editionare“flagged”byparallelbarsasshownonthemarginsofthisparagraph.ThespecificdetailofthechangemaybedeterminedbycomparingthematerialIflaggedwiththatinthepreviousedition.UnlessotherwisespecificallynotedintheMSSSP,anystandardreferredtohereinisidentifiedbythedateofissuethatwasapplicabletothereferencedstandard(s)atthedateofissueoftheMSSSP.(SeeAnnexA.)IU.S.customaryunitsinthisSParethestandard;themetricunitsareforreferenceonly.IAnypartofthisstandardmaybequoted.Creditlinesshouldread‘ExtractedJi.omMSSSP-9,2001,withpermissionofthepublisher,theManufacturersStandardizationSociety.’ReproductionprohibitedundercopyrightconventionunlesswrittenpermissionisgrantedbytheManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.OriginallyApprovedJuly1929Copyright0,1984byManufacturersStandardizationSocieîyoftheValveandFittingsIndustry,Inc.PrintedinU.S.A.ICopyrightMSSProvidedbyIHSunderlicensewithMSSNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,,,,,-`-`,,`,,`,`,,`---()STDMSSBoltS.=1518SP-9-ENGL2OOLESpotFaceDiameterMinimumInchesm3.1279.2MSSSTANDARDPRACTICESP-93147181SPOTFACINGFORBRONZE,IRONANDSTEELFLANGES~1.5639.61.7845.22.0351.61.SCOPE17/822114ThisMSSStandardappliestothespotfacingofpipeflangesinbronze,grayiron,ductileironorsteelwhencastintegralwithvalvesandfit-tings,aswellasthecompanionflanges,whensorequiredbythestandardfortheproduct.~3.5088.93.7595.34.18106.22.DESIGN12.1ThedimensionsforspotfacingapplytotheuseofhexagonheadboltsorhexagonnutsinaccordancewithAmericanNationalStandardheavyseries,ASMEB18.2.1andASMEB18.2.2.Forboitsizes1/2and5/8,theminimumdiameterofspotfacingissufficientforregularsquareheadboltsinaccordancewithASMEB18.2.1.~23145.06128.535.50139.73IR6.37161.82.2TheminimumspotfacingdiametersillustratedinFigure1arelistedinTable1forboltsizes1/2in.through31/2in.2.3Whencuttingintothehubofcompanionflangesorthebodyofflangedfittingsandvalveswithspotfacingtoolsisnecessary,theresultingwallthick-nessshallnotbelessthantheminimumrequiredthick-nessspecifiedintheappropriatestandard.2.4Eccentricityofthespotfacediameterwiththeboltholemustbelimitedtoprovidesufficientfacingfortheboltheadandnutusedinthejointassembly.2.5Theboltsizesforwhichspotfacingisprovidedincludea11thesizesrequiredinthevariousflangestandardsasindicated:FIGURE1-FlangeWithSpotFacingTable1-SpotFaceDiametersSpotFaceDiameterMinimumInches28.4I5i8I1.37I34.8II11/8I2.21I56.1II13/4I3.31I84.1II2il2I4.62I117.3ICopyrightMSSProvidedbyIHSunderlicensewithMSSNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,,,,,-`-`,,`,,`,`,,`---()STD-MSSSP-7-ENGL2001577DbYO0501~Li37!-TOIMSSSTANDARDPRACTICESP-9BronzeASMEB16.24,Class150,300,400,600,900,1500,and2500PipeFlangesandClass150and300FlangedFittings.MSSSP-106CastCopperAlloyFlangesandFlangedFittings,Class125,150and300.GrayIronASMEB16.1CastIronPipeFlangesandFlangedFittings,Class25,125,and250.DuctileIronASMEB16.42DuctileIronPipeFlangesandFlangedFittings,Class150and300.SteelASMEB16.5PipeFlangesandFlangedFittings.2.6Thedepthofthespotfaceisnotgiveninthisstandardastherequirementiscoveredinthevariousflangefittingsstandards.2.7Backfacingmaybeusedasanalternatetospotfacingatthemanufacturer’soption.Whenused,backfacingshallprovideasurfacethatwillensurefullbearingoftheboltingnut.Themini-mumdiameterofthebackfaceshallbenolessthantheboltcirclediameterlessonespotfacediameteraslistedinTable1.Whencuttingintothehubofflanges,flangefittings,orflangedvalvebodieswithbackfacingtools,theintersectionshallhavearadiusofnotlessthan1116-inch.Theresultingwallthicknessforfittings,andvalvebodiesshallnotbelessthantheminimumre-quiredthicknessspecifiedintheappropriatestandard.2.8Thebearingsurfacesofspotfacesorbackfacingshallbeparalleltotheflangefacewithintherequirementoftheappropriatestandardin2.5.2CopyrightMSSProvidedbyIHSunderlicensewithMSSNotforResaleNoreproductionornetworkingpermi