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1、MSSSP442006MSSSteelPipelineFlangesStardPracticeDevelopedApprovedbytheManufacturersStardizationSocietyoftheValveFittingsIndustryInc.127ParkStreetNEViennaVirginia22180(703)2816613Email:www.msshq.gMSSSTARDPRACTICESP44iiFEWD

2、TheManufacturersStardizationSocietyiginallydevelopedthisStardPracticeinresponsetothecontinuedrequestsfsteelpipeflangesfpipelineuseparticularlyinsizeslargerthanthosecoveredbyANSIStardB16.5onSteelPipeFlangesFlangedFittings

3、.Thelinepipeisuniquelyacterizedbyhighstrengthcoldwkedthinwallofthecarbonsteelgradewhichnecessitatesspecialconsiderationsftheweldingendoftheflanges.ThesizepressureclassrangewasiginallyNPS26throughNPS36inpressureclassescus

4、tomarilydesignatedinANSIStardB16.5as300400600900lb.The1970editiondthesliponflangesflackofdemaddeda150lb.classcoveragefsizesNPS12throughNPS24.Additionalcoveragewasalsonecessitatedbytheadventoftheuseoflinepipeofgradeshavin

5、gminimumspecifiedyieldstrengthhigherthanthe52000psimaximumcontemplatedatthetimeofinitialdevelopmenttherefestillthinnerwalls.Insomeinstancesthisadventwidenedthedifferentialbetweenthetensilepropertiesoftheflangesteelversus

6、thatofthematingpipesteel.Thisinturnnecessitatedgreaterflexibilityintheionofhubdimensionssothatvariouscombinationsofmaterialstrengthflangedimensionscouldbeutilizedtosupplytheflanges.Section5onFlangeDesignwasintroducedatth

7、ispointisoneofthekeyfeaturesofthisstard.The1972editionincludedthecoverageofblindflangesinallpressureclassesclarificationoftextrequirementsfbetterunderstingusageunderthemediverseconditions.The1975editionexpedthesizerangea

8、bovesizeNPS36.ThedrillingtemplatesftheClass150flangesoftheNPS38largersizescontinuedthepreviousphilosophyofadoptingthedrillingtemplateoftheClass125ofANSIStardB16.1.HoweverthedrillingtemplatesoftheClass300flangesoftheNPS38

9、largersizesdidnotcontinuetheadoptionoftheClass250ofANSIStardB16.1drillingtemplatesndidtheNPS38largersizesofClasses400600900continuetheextrapolationofANSIB16.5drillingtemplatesinsteadthesedrillingtemplateswerenecessarilyd

10、esignedmecompactlybecauseoftheincreasedloads.WhiletheseflangesaredesignatedbythecustomaryANSIStardClass150300400600900theiruseisalmostentirelyconfinedtocrosscountrytransmissionpipelinesatatmospherictemperatures.Theflange

11、shavebeendesignedprimarilyfuseattheircoldratingswhichconfmtotheANSIStardB16.5ratingsof1000Fareintendedprimarilyfattachmenttorelativelythinwallhighstrengthcoldwkedpipehighstrengthbuttweldingfittingsinpipelineserviceattemp

12、eraturesof4500Flower.HoweverflangesfgedofothermaterialsarecapableofpressuretemperatureratingsasspecifiedinSection2.1.The1980editionwascreatedtobringthedocumentintoclosereditialalignmentwithANSIB16.5.Howeveroutofrecogniti

13、onofthesuccessfulexperienceofthepipelineindustryroomtemperatureratingswereextendedto2500F.Deratingabove2500Fwasacceleratedsuchthatthe4500FratingsarethesameasANSIB16.5.Usersarecautionedthatwhentheseflangesareboltedtovalve

14、susedattemperaturesbetween1000F4500Ftheratingofthevalvewillnotbeashighastheflange.The1990revisionofthisSPwasrequiredtoupdatethereferencedstardslistthemetricequivalents.The1991revisionofthisSPwasrequiredtoaddblindflangema

15、chiningguidanceflatfacerequirementsprecautionarynotesaswellasupdateofreferencedstards.The1996revisionaddsatablewithpermissibleimperfectionsinflangefacingfinishclarifiesAnnexAdesigncriteria.Therewereseveralerratacrections

16、madetoreferencestootherstards.DimensionaltoleranceshavebeenchangedwherenecessarytoconfmwithASMEB16.5B16.47.The2006revisionwasrequiredtoaddmetricequivalentunitsnotchtoughnessrequirementnewboltingmaterialsupdateofreference

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