Dab Tsi Yog Flange Pressure Rating?
Flange pressure rating yog qhov siab tshaj plaws ntawm qhov kev tso cai ua haujlwm (MAWP) rau ib hom flange class thiab khoom siv ntawm ib qho kub uas tau teev tseg. Thaum kub nce, lub zog ntawm cov khoom siv txo qis, yog li qhov siab tshaj plaws uas tso cai yuav poob qis raws li qhov ntawd. Txhua ASME B16.5 pressure class sib raug rau qhov ntev thiab loj ntawm flange, qhov loj ntawm lub voj voog ntawm lub qhov (bolt circle), tus naj npawb ntawm cov ntsia hlau (bolts), thiab qhov loj ntawm cov ntsia hlau. Cov class siab dua muaj flange tuab dua, lub voj voog ntawm lub qhov loj dua, thiab muaj ntau cov ntsia hlau los tiv thaiv lub zog siab sab hauv.
Qhov pressure-temperature rating yog nyob ntawm cov khoom siv. Carbon steel (ASTM A105), stainless steel (ASTM A182 F304/F316), thiab alloy steel (ASTM A182 F11/F22) txhua yam muaj cov nkhaus (curves) sib txawv rau tib lub class. Thaum xaiv ib tug pressure class, koj yuav tsum xyuas cov lus qhia tshwj xeeb (rating table) rau cov khoom siv uas koj xaiv ntawm qhov kub siab tshaj plaws uas tsim tau (design temperature).
ASME B16.5 Pressure Class Txheej Txheem
| Class | Qhov Siab Siab Tshaj Plaws ntawm Qhov Kub Ib Txheem (psi) | Kev Siv Feem Ntau | Hom Facing |
|---|---|---|---|
| 150 | 285 | Deb siab qis, cua, chav ua kom kub (steam) | RF |
| 300 | 740 | Txheej txheem siab nruab nrab | RF |
| 400 | 990 | Siab nruab nrab mus rau siab | RF |
| 600 | 1480 | Kev ua hydrocarbon (hydrocarbon processing) | RF/RTJ |
| 900 | 2220 | Refinery, petrochemical | RTJ |
| 1500 | 3705 | Feedwater, injection | RTJ |
| 2500 | 6170 | Hydroprocessing | RTJ |
Class 150
Class 150 yog qhov qis tshaj plaws ntawm pressure class uas ASME B16.5 tau txhais, nrog qhov siab tshaj plaws uas tso cai yog li 285 psi ntawm qhov kub ib txheem (ambient temperature). Cov flanges no yog qhov pheej yig tshaj plaws rau cov haujlwm tsis tseem ceeb (non-critical) xws li dej siab qis, cua compressed, chav ua kom kub siab qis, thiab kev pabcuam siv dav dav (general utility services). Class 150 flanges muaj nyob dav dav hauv txhua hom khoom siv thiab facing. Txawm li cas los xij, qhov pressure rating poob qis heev thaum kub siab tshaj 500°F, yog li lawv tsis haum rau kev siv ntawm kub siab.
Class 300
Class 300 flanges muab qhov siab tshaj plaws li ntawm 740 psi ntawm qhov kub ib txheem. Lawv muaj nyob rau hauv cov txheej txheem siab nruab nrab hauv refineries, chemical plants, thiab power generation facilities. Class 300 muab qhov sib npaug zoo ntawm tus nqi thiab kev ua haujlwm, ua haujlwm ua tus choj ntawm cov txheej txheem siab qis thiab siab. Lawv muaj nyob rau hauv ob qho tib si raised face thiab ring joint facings, txawm hais tias raised face yog tus qauv rau feem ntau ntawm cov kev siv ntawm qib no.
Class 600
Class 600 flanges tuav tau txog 1480 psi ntawm qhov kub ib txheem thiab yog qhov kev xaiv tus qauv rau kev pabcuam hydrocarbon siab nruab nrab mus rau siab. Lawv tau siv dav hauv cov chaw sau (gathering), thauj (transmission), thiab ua (processing) roj thiab roj av (oil and gas). Lub cev flange tuab dua thiab lub voj voog ntawm lub qhov loj dua yuav tsum muaj lub zog nruj (bolting torque) ntau dua li cov class qis dua. Class 600 feem ntau yog qhov chaw hloov pauv uas ring type joint facings dhau los ua ib yam khoom siv (common), txawm hais tias raised face tseem siv rau ntau qhov kev siv.
Class 900
Class 900 flanges muaj qhov ntsuas li ntawm 2220 psi ntawm qhov kub ib txheem thiab siv rau hauv cov kev siv siab siab hauv refinery thiab petrochemical. Kev sib haum yeeb nrog cov phav tuab (heavy-wall pipe) feem ntau yuav tsum tau siv weld neck flanges ntawm class no. Ring type joint facings yog tus qauv rau Class 900 kom ntseeg tau tias yuav muaj kev khi nruj nreem (leak-tight) ntawm hlau rau hlau (metal-to-metal sealing). Cov khoom siv bolting muaj zog xws li ASTM A193 B7 yog qhov yuav tsum tau ua kom tau txais qhov bolt preload tsim nyog.
Class 1500
Class 1500 flanges muab qhov siab tshaj plaws li ntawm 3705 psi ntawm qhov kub ib txheem. Lawv tau teev tseg rau kev pabcuam siab heev xws li boiler feedwater, chemical injection, thiab cov txheej txheem roj siab (high-pressure gas systems). Cov ntsia hlau loj thiab qhov yuav tsum tau torque siab xav tau cov cuab yeej hydraulic torque rau kev sib dhos kom raug. Alloy steel thiab stainless steel yog cov khoom siv uas nquag siv ntawm class no kom khaws lub zog ntawm kub siab.
Class 2500
Class 2500 sawv cev rau qhov siab tshaj plaws ntawm cov qauv pressure class hauv ASME B16.5, nrog qhov siab tshaj plaws uas tso cai yog li 6170 psi ntawm qhov kub ib txheem. Cov flanges no muaj qhov hla (cross-section) tuab tshaj plaws ntawm txhua class thiab siv rau hauv cov kev siv siab heev xws li high-pressure hydroprocessing reactor circuits. Lawv yuav tsum tau txheej txheem vuam tshwj xeeb (welding procedures), post-weld heat treatment, thiab kev kuaj xyuas tsis mob lub cev (nondestructive examination) ntau. Class 2500 flanges yuav luag txhua tus yog hom weld neck nrog ring joint facings.
EN 1092-1 PN Rating Kev Sib Piv
Cov qauv European EN 1092-1 siv PN (Pressure Nominale) ratings es tsis txhob siv ASME classes. Cov PN ratings muaj xws li PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, thiab PN400. Tus nqi PN kwv yees qhov siab tshaj plaws hauv bar ntawm qhov kub ib txheem. ASME Class 150 yeej sib npaug li PN20, Class 300 sib npaug li PN50, thiab Class 600 sib npaug li PN100. Txawm li cas los xij, qhov sib txawv ntawm qhov ntev thiab loj (dimensional differences) ntawm cov qauv no tsis pub kev hloov pauv ncaj qha (direct interchangeability), thiab cov nkhaus pressure-temperature txawv ntawm qhov kub siab.
| ASME Class | Kwv yees EN PN Sib Npaug | Qhov Siab Siab Tshaj Plaws (bar) |
|---|---|---|
| 150 | PN20 | 20 |
| 300 | PN50 | 50 |
| 600 | PN100 | 100 |
| 900 | PN150 | 150 |
| 1500 | PN250 | 250 |
| 2500 | PN400 | 400 |
Yuav Xaiv Pressure Class Li Cas Kom Raug
Txiav txim siab qhov design pressure thiab kub los ntawm koj cov xwm txheej txheej txheem, suav nrog ib qho surge, hydrostatic test, lossis cov xwm txheej hloov pauv (transient conditions) uas yuav dhau qhov kev ua haujlwm ib txwm. Xaiv ib pawg khoom siv (material group) thiab xyuas nws cov limits pressure-temperature tiv thaiv cov xwm txheej design. Ib txwm xav txog kev nce peev xwm (capacity increases) yav tom ntej lossis qhov yuav tsum tau txo qis (derating requirements). Qhov tseem ceeb tshaj plaws yog ib txwm xyuas qhov pressure-temperature rating rau cov khoom siv uas koj xaiv ntawm qhov kub siab tshaj plaws uas tsim tau, yeej tsis txhob cia siab rau tus lej class ntawm nws tus kheej xwb.
Xav Tau Kev Pab Txog Pressure Rating?
Tiv tauj peb pab neeg engineering rau kev taw qhia txog flange pressure rating los ntawm cov kws tshaj lij rau koj qhov haujlwm tom ntej.
Cov Khoom Siv Flange
