Blind Flange yog Dab Tsi?
Blind flange yog ib hom flange uas zoo li lub disc tiaj tiaj uas muaj qhov tho rau ntsia hlau tab sis tsis muaj qhov nruab nrab. Nws yog siv los kaw qhov kawg ntawm ib qho piping system lossis qhov qhib ntawm lub pressure vessel. Blind flanges muab kev txwv cov pressure zoo ntawm cov fittings, valves, thiab equipment nozzles. Lawv yog cov khoom tseem ceeb rau kev ntsuas pressure thaum sib dhos piping sections, muab cov txiaj ntsig rau yav tom ntej rau kev nthuav dav ntawm lub hoobkas, thiab cais cov equipment uas tsis siv lawm. Blind flanges tuaj yeem nruab nruab nrab ntawm ob lub flanges los cais ib feem ntawm piping system lossis ntawm qhov kawg ntawm ib txoj raj rau kev kaw mus ib txhis lossis ib ntus.
Kev Tsim thiab Qhov Ntsuas
Blind flanges yog ntsuas raws li ASME B16.5 rau qhov loj NPS 1/2 txog 24. Lawv yog tsim los ua cov phiaj tiaj tiaj uas muaj qhov tho rau ntsia hlau phim cov qauv rau txhua qhov pressure class. Qhov tuab yuav tsum tau ua kom phim cov pressure class requirements rau cov khoom siv, thiab vim tias tsis muaj qhov tho, tag nrho qhov cross-section muaj peev xwm tiv thaiv pressure. Blind flanges muaj nyob rau txhua hom facing: raised face, flat face, ring type joint, male thiab female, thiab tongue and groove. Large-diameter blind flanges yuav tsum muaj lifting lugs kom nyab xeeb thaum nruab thiab tshem tawm.
| NPS | Class 150 Tuab (hauv) | Class 300 Tuab (hauv) | Class 600 Tuab (hauv) | Class 900 Tuab (hauv) |
|---|---|---|---|---|
| 2 | 0.44 | 0.56 | 0.62 | 0.75 |
| 4 | 0.62 | 0.75 | 0.94 | 1.12 |
| 6 | 0.75 | 0.94 | 1.12 | 1.38 |
| 8 | 0.88 | 1.12 | 1.38 | 1.62 |
| 10 | 1.00 | 1.25 | 1.62 | 1.88 |
| 12 | 1.12 | 1.38 | 1.75 | 2.12 |
Kev Ntsuas Pressure
Blind flanges muaj nyob rau txhua qhov ASME pressure classes los ntawm 150 txog 2500. Vim tias tsis muaj qhov tho, tsis muaj pressure poob los ntawm internal thinning, thiab tag nrho qhov flange thickness tiv thaiv lub internal pressure. Blind flanges ntawm qhov kawg ntawm cov raj pom tag nrho cov hydrostatic test pressure, feem ntau yog 1.5 npaug ntawm qhov design pressure. Cov higher classes xav tau cov phiaj tuab heev, ua rau large-diameter, high-class blind flanges hnyav heev thiab xav tau kev npaj zoo thaum tuav thiab txav.
Cov Khoom Siv
Blind flanges muaj nyob rau tib hom khoom siv raws li lwm yam ASME B16.5 flanges. ASTM A105 carbon steel yog tus qauv rau kev siv dav dav. ASTM A350 LF2 low-temperature carbon steel yog siv rau cov haujlwm uas kub tshaj -50°F. ASTM A182 F304 thiab F316 stainless steels ua haujlwm zoo rau cov chaw corrosive. Alloy grades F11, F22, thiab F91 muaj rau cov high-temperature service. Duplex materials yog siv rau marine thiab sour gas applications raws li NACE MR0175.
Kev Siv
Blind flanges ua haujlwm tseem ceeb ntau yam hauv piping systems. Raws li qhov kawg, lawv kaw qhov kawg ntawm piping systems thiab pressure vessels. Rau kev ntsuas pressure, blind flanges yog nruab ntawm qhov kawg ntawm qhov ntsuas thiaj li tuav tau lub pressure thaum tso cai rau kev soj ntsuam tag nrho qhov system. Future tie-in points yog capped nrog blind flanges uas tshem tau thaum xav tau nthuav dav. Manhole covers ntawm tanks thiab vessels feem ntau siv blind flanges rau kev nkag mus. Decommissioned equipment yog cais los ntawm kev nruab blind flanges ntawm nws qhov kev sib txuas.
Cov Kev Xaiv
Qhov loj ntawm blind flange yuav tsum phim qhov nominal diameter ntawm cov piping uas nyob ib sab. Qhov pressure class yuav tsum phim lossis tshaj qhov system design pressure, suav nrog hydrostatic test conditions. Qhov facing type yuav tsum phim qhov mating flange lossis equipment nozzle facing. Cov khoom siv yuav tsum haum rau cov process media, kub, thiab ambient conditions. Rau large-diameter blind flanges, qhov hnyav thiab kev tuav yuav tsum raug soj ntsuam, suav nrog qhov xav tau lifting lugs thiab mechanical handling equipment.
Kev Sib Piv nrog Caps thiab Plugs
Blind flanges muaj cov txiaj ntsig tseem ceeb tshaj lwm yam kev kaw qhov kawg. Tsis zoo li pipe caps uas yog welded thiab nyuaj rau tshem tawm, blind flanges muab ib qho bolted connection uas yooj yim tshem tawm rau kev nkag mus. Plugs yog threaded thiab txwv rau cov loj me thiab qis pressure ratings. Blind flanges yog nyiam rau kev ntsuas pressure vim lawv yooj yim tshem tawm tom qab qhov ntsuas tiav. Lawv kuj tso cai rau kev soj ntsuam pom qhov kawg thiab tuaj yeem rov siv tau ntau zaus, tsis zoo li welded caps uas yuav tsum txiav thiab muab pov tseg.
Xav Tau Blind Flanges rau Koj Qhov Project?
Hu rau peb pab neeg engineering rau kev xaiv blind flange zoo thiab tus nqi sib tw.
Cov Khoom Flange
