1. ASTM A671/CG100 Class 30 Steel Pipe yog dab tsi?
Teb:
ASTM A671 / CG100 Chav Kawm 30 yog ib qhohluav taws xob-fusion-welded (EFW) carbon steel yeeb nkabtsim rausiab-siab thiab qis-kev pabcuam kub, ua raws li cov qauv ASTM A671.
"CG100": Qhia cov khoom siv carbon steel qib.
"Class 30": QhiaKev ntsuas hydrostatic ntawm 125% ntawm cov khoom muaj zogthiab nruj NDT cov cai.
Kev siv tseem ceeb: Cov ntawv thov tseem ceeb heev (piv txwv li, LNG terminals, petrochemical nroj tsuag).
2. Chav Kawm 30 txawv li cas ntawm cov chav kawm qis (piv txwv li, Chav Kawm 22/23)?
Teb:
| Chav kawm | Kuaj Siab | Qhov Tseem Ceeb |
|---|---|---|
| Chav Kawm 22 | 100% tawm los | Txuj siv cryogenic |
| Chav Kawm 23 | 100% tawm los + NDT tag nrho | Txhim kho kev tshuaj xyuas |
| Chav Kawm 30 | 125% yield+ NDT tag nrho | Kev ntseeg siab tshaj plaws rau kev kub siab heev |
| Nco tseg: Chav Kawm 30 yog rau cov tshuab uas qhov kev pheej hmoo tsis ua haujlwm yuav tsum raug txo qis (xws li, offshore, siab - roj av siab). |
3. Dab tsi yog qhov kub thiab txias txwv?
Teb:
Kub: Rated rau-50 ° F txog 650 ° F (-45 ° F txog 343 ° F); cuam tshuam- sim rau sub-zero brittleness.
Siab: Tsim los rauNtau dua lossis sib npaug li 2,500 psi(Qhov kev ntsuas tseeb nyob ntawm txoj kab uas hla / phab ntsa thickness ib ASME B31.3).
Qhov Tseem Ceeb: Cov ntaub ntawv toughness txheeb xyuas los ntawm Charpy V-cov ntawv ntsuas ntawm qhov ntsuas kub.
4. Cov qauv thiab ntawv pov thawj siv dab tsi?
Teb:
Thawj StandardASTM A671 (EFW kav).
Kev sim:
ASTM A370 (kev ntsuam xyuas tshuab).
ASME Tshooj IX (welding).
Yuav tsum tau: 100% radiography lossis kuaj ultrasonic.
Cov ntawv pov thawj: MTRs nrog chemistry, cov ntaub ntawv ntsuas qhov cuam tshuam, thiab cov ntaub ntawv ntsuas hydrostatic.
5. Dab tsi yog qhov tseem ceeb ntawm Fabrication Challenges?
Teb:
Vuam: Yuav tsum taupreheat / PWHTkom tsis txhob hydrogen -induced cracking.
NDT Kev Ua Raws Cai: Tag Nrho Kev Tshuaj Ntsuam Xyuas (RT/UT) rau Chav Kawm 30.
Kev teeb tsa: Kev sib tw nruj nruj; txias khoov tsuas yog nrog kev pom zoo engineering.
Tswv yim Pro: Ua raws li ASTM A671 Appendix X4 rau Chav Kawm 30-cov txheej txheem vuam tshwj xeeb.
