Dab Tsi Yog Hom Ntawm Flange Facing?
Qhov facing yog qhov chaw tsim khoom ntawm lub flange uas ntsib lub flange sib txuas nrog lub gasket nyob nruab nrab. Hom facing txiav txim siab seb lub gasket khaws cia li cas, bolt load faib li cas, thiab lub joint ua haujlwm li cas thaum muaj pressure thiab kub. Facing finish, dimensions, thiab surface roughness txhua yam cuam tshuam rau seal performance. ASME B16.5 qhia txog qhov surface finish ntawm 125 txog 250 microinches RMS rau standard flange facings, feem ntau tsim nrog concentric lossis spiral serrations.
| Hom Facing | Luv Npe | Hom Gasket | Feem Ntau Class Range | Kev Siv Tseem Ceeb |
|---|---|---|---|---|
| Raised Face | RF | Flat sheet, spiral wound | 150 - 2500 | Kev siv dav dav |
| Flat Face | FF | Full-face | 125 - 300 | Cast iron khoom siv |
| Ring Type Joint | RTJ | Metal ring | 600 - 2500 | High-pressure, high-temp |
| Male & Female | M&F | Flat, contained | 150 - 2500 | Chemical processing |
| Tongue & Groove | T&G | Flat, contained | 150 - 2500 | Cov kua txawv ua rau muaj kev phom sij |
Raised Face (RF)
Lub raised face yog hom flange facing uas feem ntau siv, siv rau txhua qhov pressure classes thiab material grades. Lub raised surface ua kom bolt load tso rau ntawm qhov chaw gasket, txhim kho sealing efficiency. Qhov siab ntawm raised face feem ntau yog 1/16 inch rau Class 150 thiab 300 flanges, thiab 1/4 inch rau Class 400 txog 2500. RF facings ua haujlwm tau nrog txhua hom gaskets suav nrog non-metallic, semi-metallic, thiab metallic gaskets. Lub surface finish feem ntau yog serrated nrog concentric lossis spiral pattern kom tuav tau thiab tiv thaiv gasket extrusion.
Flat Face (FF)
Lub flat face nthuav mus thoob plaws lub flange face tsis muaj qhov raised. Nws yog siv feem ntau nrog cast iron lossis flat-faced equipment kom tsis txhob rhuav tshem flange los ntawm bolt stress rau brittle materials. Full-face gaskets yog siv nrog flat face flanges kom faib bolt load kom sib npaug thoob plaws lub face area. Flat face flanges feem ntau pom muaj nyob rau low-pressure applications (Class 125 lossis 250 hauv cast iron, lossis Class 150 hauv steel) txuas rau cast iron valves, pumps, thiab compressors.
Ring Type Joint (RTJ)
Lub ring type joint facing muaj qhov precision-machined groove nyob rau hauv lub flange face uas txais tau ib tug metal ring gasket. Thaum cov bolts nruj, lub ring gasket hloov mus rau hauv cov groove phab ntsa, tsim kom muaj kev sib khi ntawm hlau thiab hlau. RTJ facings yog tsim rau high-pressure thiab high-temperature service, feem ntau Class 600 thiab siab dua. Lub groove dimensions raug standardized raws li ASME B16.5, thiab muaj peb hom ring profiles: oval, octagonal, thiab RX. RTJ flanges yuav tsum tau ceev faj kom tsis txhob ua puas lub groove sealing surfaces.
Male & Female (M&F)
Male thiab female facing pairs muab kev sib haum xeeb thaum sib dhos. Lub male face ntawm ib lub flange tso rau hauv lub female recess ntawm lub flange sib txuas, khaws lub gasket kom tag nrho hauv lub female recess. Tus qauv no txo qis gasket extrusion thaum muaj siab pressure thiab feem ntau siv hauv chemical processing applications. M&F facings muaj nyob thoob plaws txhua qhov pressure classes thiab feem ntau raug xaiv rau cov ntawv uas kev tiv thaiv gasket blowout yog qhov tseem ceeb.
Tongue & Groove (T&G)
Tongue thiab groove facings zoo ib yam li M&F tab sis muaj qhov sib koom nkag tob dua. Lub tongue ntawm ib lub flange tso kom zoo rau hauv lub groove ntawm lub flange sib txuas, muab kev sib dhos kom tseeb thiab kev tiv thaiv anti-blowout. Lub gasket zaum kom tag nrho hauv lub groove, ua rau T&G facings zoo tshaj rau high-pressure chemical thiab hazardous fluid service. Lawv feem ntau siv rau hauv heat exchanger thiab pressure vessel nozzle connections uas qhov tseem ceeb yog tsis txhob xau roj.
Kev Cai Ntawm Facing Surface Finish
ASME B16.5 qhia tias flange facings yuav tsum muaj qhov surface finish ntawm 125 txog 250 microinches RMS (3.2 txog 6.3 micrometers Ra). Qhov finish tuaj yeem tsim los ntawm concentric lossis spiral serration, nrog rau lub serration tool radius teev los ntawm tus qauv. Qhov surface finish cuam tshuam rau gasket seating thiab sealing reliability: cov finishes uas du dua yuav tsum tau rau cov soft gaskets xws li elastomers thiab PTFE, thaum cov rougher finishes ua haujlwm zoo nrog metallic thiab semi-metallic gaskets uas yuav tsum tuav tau qhov chaw.
Yuav Xaiv Qhov Facing Zoo Li Cas
Rau feem ntau cov applications, raised face yog qhov default thiab pom zoo. Qhia tias siv flat face thaum txuas rau cast iron lossis flat-faced equipment kom tsis txhob rhuav tshem flange. Siv RTJ rau high-pressure thiab high-temperature service, tshwj xeeb tshaj thaum Class 900 thiab siab dua. M&F thiab T&G facings yuav tsum raug xaiv rau chemical thiab hazardous services uas kev khaws gasket thiab kev tiv thaiv anti-blowout yog qhov tseem ceeb. Nco ntsoov ob lub flanges uas sib txuas yuav tsum muaj hom facing uas sib haum.
Xav Tau Kev Pab Xaiv Flange Facing?
Hu rau peb pab engineering kom tau txais kev taw qhia los ntawm cov kws tshaj lij txog hom flange facing thiab kev sib haum ntawm gasket.
