Txheej Txheem Txog Flange Ntaub Ntawv
Carbon steel flanges yog qhov kev xaiv feem ntau thiab pheej yig tshaj plaws rau cov txheej txheem xa hluav taws xob dav dav. Cov stainless steel qib muab kev tiv thaiv corrosion rau cov tshuaj hnyav thiab marine ib puag ncig. Alloy steel flanges tuav tau qhov kub thiab siab uas carbon steel tsis tuaj yeem ua tau. Nickel alloy flanges pab rau cov xwm txheej tshuaj hnyav thiab kub uas txawm stainless steel kuj tsis txaus. Kev xaiv ntaub ntawv ncaj qha cuam tshuam rau flange qhov ntsuas kub-siab, weldability, thiab lub neej kev pab cuam.
Xaiv Raws li Kub
Kub yog feem ntau yog qhov tseem ceeb tshaj plaws hauv kev xaiv ntaub ntawv vim nws txiav txim siab rau cov khoom siv mechanical properties thiab kev ruaj ntseg mus ntev. Cov lus hauv qab no qhia txog cov flange ntaub ntawv uas siv tau raws li qhov kub:
| Ntaub Ntawv | Specification | Qhov Kub Ntau | Cov Yam Tshwj Xeeb |
|---|---|---|---|
| Carbon Steel | ASTM A105 | -20°F txog 1000°F | Kev pab cuam dav dav, pheej yig |
| Carbon Steel Kub Tsawg | ASTM A350 LF2 | -50°F txog 650°F | Kev ntsuas kev cuam tshuam, ductile |
| Carbon Steel Kub Tsawg | ASTM A350 LF3 | -150°F txog 650°F | Muaj zog txias thaum kub tsawg |
| 1-1/4Cr-1/2Mo | ASTM A182 F11 | 0°F txog 1100°F | Kev pab cuam kub siab nruab nrab |
| 2-1/4Cr-1Mo | ASTM A182 F22 | 0°F txog 1100°F | Tiv thaiv hydrogen service |
| 9Cr-1Mo-V | ASTM A182 F91 | 0°F txog 1200°F | Muaj zog creep siab |
| Stainless 304 | ASTM A182 F304 | -425°F txog 1500°F | Kev tiv thaiv corrosion dav dav |
| Stainless 316 | ASTM A182 F316 | -425°F txog 1500°F | Tiv thaiv chloride |
| Duplex 2205 | ASTM A182 F51 | -50°F txog 600°F | Muaj zog siab, tiv thaiv corrosion |
| Super Duplex 2507 | ASTM A182 F53 | -50°F txog 600°F | Kev tiv thaiv corrosion heev |
Xaiv Raws li Siab
Khoom siv lub zog ncaj qha txiav txim siab rau qhov siab tshaj plaws uas tso cai rau txhua chav kawm. Cov ntaub ntawv muaj zog dua tuaj yeem tso cai rau siv qib siab qis dua, txo qhov hnyav thiab tus nqi flange. Carbon steel A105 tsim nyog rau feem ntau cov ntawv thov txheem txog Class 600. Rau cov qib siab dua lossis kub siab, alloy thiab stainless qib muab lub zog zoo dua. Chrome-moly qib xws li F22 thiab F91 tuav tau lawv lub zog ntawm qhov kub uas carbon steel yuav creep thiab ua tsis tiav.
Xaiv Raws li Khoom Siv
Cov khoom siv corrosive yuav tsum xaiv ntaub ntawv zoo kom tsis txhob puas tsuaj thiab ua tsis tiav. Rau cov ib puag ncig corrosive dav dav, stainless steel 304 lossis 316 yog qhov kev xaiv zoo. Molybdenum hauv 316 txhim kho pitting thiab chloride tiv thaiv, ua rau nws tsim nyog rau marine thiab chemical ntawv thov. Hydrocarbon service tuaj yeem siv carbon steel nrog kev tso cai corrosion tsim nyog, thaum cov ntawv thov tshuaj hnyav xav tau high-alloy lossis nickel-based ntaub ntawv. Rau marine thiab sour gas (NACE MR0175) ib puag ncig, duplex thiab super duplex qib muab kev tiv thaiv zoo tshaj plaws rau chloride stress corrosion cracking.
Cov Qauv Ntaub Ntawv thiab Kev Ntsuas
ASTM/ASME cov ntawv qhia ntaub ntawv yog sib haum xeeb thoob plaws B16.5 thiab B16.47 flange cov qauv. EN 1092-1 qhia cov khoom siv European sib npaug nrog cov txheej txheem sib txawv. Cov ntawv pov thawj ntaub ntawv (Mill Test Reports) yuav tsum txheeb xyuas cov tshuaj lom neeg thiab cov khoom siv mechanical rau txhua qhov kub. Kev ntsuas kev cuam tshuam yuav tsum muaj rau cov ntaub ntawv ua haujlwm thaum kub tsawg raws li ASME B31.3 thiab cov ntaub ntawv specification uas siv tau. Ib txwm yuav tsum muaj kev taug qab tag nrho los ntawm steel mill mus rau flange tiav rau cov ntawv thov tseem ceeb.
Cov Kev Ua Zoo Tshaj Plaws rau Kev Xaiv Ntaub Ntawv
Tus nqi piv rau kev ua tau zoo: phim cov ntaub ntawv rau cov xwm txheej kev pab cuam tiag tiag yam tsis txhob over-specifying. Weldability yog ib qho tseem ceeb rau alloy steels, vim qee qhov xav tau preheat thiab post-weld heat treatment. Tsis txhob muab galvanic corrosion los ntawm kev sib xyaw cov hlau sib txawv hauv tib lub pob. Cov ntaub ntawv txheem feem ntau ua rau lub sijhawm luv dua thiab tus nqi qis dua li exotic qib. Ib txwm xaiv cov ntaub ntawv uas phim qhov hnyav tshaj plaws ntawm kev ua haujlwm, tsis yog qhov pheej yig tshaj plaws uas ua tau ib qho parameter.
Xav Tau Kev Pab Xaiv Flange Ntaub Ntawv?
Hu rau peb pab neeg engineering rau kev taw qhia los ntawm cov kws tshaj lij txog kev xaiv ntaub ntawv rau koj cov xwm txheej kev pab cuam tshwj xeeb.
