Threaded Flange Guide: Tsim, Kev Ntsuas, thiab Daim Ntawv Thov

Ib tug threaded flange muaj ib tug internally threaded bore uas screws mus rau externally threaded yeeb nkab. Cov threads tsim ib qho kev sib txuas uas tuaj yeem sib sau ua ke yam tsis muaj vuam lossis cov cuab yeej tshwj xeeb. Threaded flanges siv tus qauv NPT (National Pipe Taper) threads ib ASME B1.20.1 rau North American daim ntaub ntawv, los yog BSP (British Standard Pipe) threads ib ISO 7 rau European lag luam. Cov xov txuas ntev yog tsim los muab cov xov muaj zog tag nrho yam tsis muaj ntau tshaj li cov khoom muaj peev xwm.

Lub flange lub cev ntawm threaded flange zoo ib yam nyob rau hauv sab nraud qhov ntev mus rau ib tug plam - ntawm flange, tab sis nrog ib tug threaded bore es tsis txhob ntawm ib tug du. Cov threads yog tapered los muab ib tug neeg kho tshuab cuam tshuam haum uas tsim ib lub foob thaum sib koom ua ke. NPT threads muaj 1: 16 taper piv, lub ntsiab lus txoj kab uas hla hloov los ntawm 1/16 nti ib nti ntawm xov ntev. Cov xov txuas ntev yuav tsum muaj qhov sib tshooj txaus kom ua tiav qhov ntsuas siab muaj peev xwm. Qee cov qauv tsim muaj xws li lub hub uas txuas ntxiv tshaj qhov ntev ntawm cov xov rau kev ntxiv dag zog ntawm cov xov hauv paus.

NPS	Threads per Inch (NPT)	Xov Length (hauv)	Tes-Tight Engagement (hauv)	Ntsiab lus-Kev sib txuas nruj (hauv)
1/2	14	0.53	0.32	0.53
3/4	14	0.55	0.34	0.55
1	11.5	0.68	0.40	0.68
1-1/4	11.5	0.71	0.42	0.71
1-1/2	11.5	0.72	0.42	0.72
2	11.5	0.76	0.44	0.76

Threaded flanges muaj qhov ntsuas qis dua li qhov sib npaug welded flanges vim qhov kev sib txuas ntawm threaded yog qhov tsis muaj zog dua li kev sib koom ua ke. Lawv feem ntau txwv rau Chav Kawm 150 thiab Chav Kawm 300, txawm hais tias qee qhov qauv tsim muaj nyob rau hauv Chav Kawm 600. Qhov kev ntsuas siab tiag tiag nyob ntawm cov xov txuas ntev, cov yeeb nkab phab ntsa tuab, thiab lub zog ntawm cov threaded seem nyob rau hauv siab. Threaded flanges tsis pom zoo rau siab - qhov kev pabcuam kub vim tias thermal cycling tuaj yeem ua rau threaded kev twb kev txuas mus rau lub sij hawm, ua rau to.

Threaded flanges xav tau cov ntaub ntawv nrog cov machinability zoo los tsim cov xov zoo huv si. ASTM A105 carbon steel yog tus qauv xaiv rau kev pabcuam dav dav. ASTM A182 F304 thiab F316 stainless hlau yog siv rau corrosive ib puag ncig uas cov xov profile yuav tsum tiv thaiv galling thaum sib dhos. Cov qib hlau ductile muaj rau kev siv qis dua. Cov khoom siv yuav tsum tau sib haum nrog cov xov sealant siv, vim qee cov sealants tuaj yeem ua rau muaj kev ntxhov siab corrosion hauv qee cov ntaub ntawv.

Threaded flanges yog qhov tseem ceeb hauv thaj chaw muaj kev phom sij uas tsis raug tso cai, xws li cov nroj tsuag roj, refineries nrog cov txheej txheem ua haujlwm, thiab cov chaw tuav cov khoom siv hluav taws xob. Lawv yog siv rau siab - cov dej siab thiab cov tshuaj txhaj tshuaj uas siv vuam txwv tsis pub. Kev kho cov kav dej ib ntus lossis xwm txheej ceev tau txais txiaj ntsig los ntawm kev teeb tsa ceev ntawm threaded flanges. Cov tshuab hluav taws xob thiab cov kav dej siv hluav taws xob feem ntau siv threaded flanges rau lawv yooj yim ntawm installation. Me me - bore piping yuav tsum tau tshem tawm ntau zaus rau kev saib xyuas yog lwm daim ntawv thov.

Lub hom phiaj tseem ceeb ntawm threaded flanges yog tias lawv yuav tsum tsis txhob ua haujlwm kub, tshem tawm qhov xav tau ntawm vuam daim ntawv tso cai, hluav taws saib, thiab tshuaj xyuas vuam. Lawv tuaj yeem ntsia tau rau hauv txhua qhov chaw uas cov yeeb nkab threader tuaj yeem ncav cuag. Txawm li cas los xij, cov kev sib txuas welded muab kev ntsuas siab dua thiab kev ua kom zoo dua. Threaded kev twb kev txuas yog sai dua rau nruab pib tab sis tej zaum yuav xav tau rov kho dua lub sijhawm. Welded pob qij txha tuaj yeem raug tshuaj xyuas los ntawm cov txheej txheem uas tsis muaj kev puas tsuaj los xyuas kev ncaj ncees, thaum cov pob qij txha yog nyob ntawm qhov zoo ntawm cov xov txuas thiab daim ntawv thov sealant.

Siv xov sealant los yog PTFE daim kab xev rau cov yeeb nkab threads ua ntej sib dhos kom lubricate cov xov thiab sau cov kauv xau txoj kev. Tes-tighten lub flange rau ntawm cov yeeb nkab, ces siv lub pluaj ciaj ntswj rau qhov chaw zaum kawg. Tsis txhob dhau-tightening, uas tuaj yeem ua rau cov xov puas thiab ua rau lub flange tawg. Torque yuav tsum ua tiav txoj kev sib koom tes zoo yam tsis muaj kev cuam tshuam cov xov. Tom qab kev teeb tsa, ua ib qho kev ntsuas siab los xyuas kom meej lub foob ntawm lub xov sib txuas. Yog hais tias qhov sib koom ua ke, disassemble, huv si, thiab rov siv cov sealant es tsis txhob sim ua kom cov pa tawm nrog lub zog ntxiv.

Hu rau peb pab pawg engineering rau cov kws tshaj lij threaded flange xaiv thiab tus nqi sib tw.

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