1. ASTM A671 CC60 Class 20 yog dab tsi?
Txhais: Siab -siab EFW yeeb nkab raucryogenic thiab nruab nrab -kev pabcuam kub, tsim rau kev lag luam thiab kev siv hluav taws xob xav tau kev ua haujlwm zoo.
Ntsiab Spec:
Yield zog: 60 ksi (414 MPa) ntawm-20 ° F (-29 ° C).
Kev ntsuas siab: 5,000 psi (345 bar)(Qeb 20).
Khoom siv: Carbon steel nrogCharpy impact test, kom ntseeg tau ductility ntawm qhov kub thiab txias.
2. Nws siv qhov twg?
Roj & Roj:
Siab -cov kav xa hluav taws xob siab.
Cryogenic cia tank piping (LNG terminals).
Kev lag luam:
Siab - cov kab hluav taws xob / dej.
Kev ua tshuaj nyob rau hauv nruab nrab kub.
3. Cov Khoom Siv Khoom & Kev Ntsuas
| Khoom | Kev xav tau | Test Standard (ASTM) |
|---|---|---|
| Yield zog | Ntau dua lossis sib npaug li 60 ksi ntawm-20 ° F (-29 ° C) | A370 |
| Charpy Impact | Ntau dua lossis sib npaug li 20 ft-lb (27 J) ntawm-50 ° F (-45 ° F) | A673 (Pab pawg 2+) |
| Hydrostatic Test | 1.5x tsim siab (7,500 psi) | A671 Tshooj 12 |
| NDT | 100% radiography lossis ultrasonic | E94 / E213 |
4. Kev tsim khoom & ntawv pov thawj
Txheej txheem:
Submerged arc vuam (SAW)nrog nruj weld kev ncaj ncees tswj.
Post-weld heat treatment (PWHT) for stress relief (mandatory for thickness >1.5").
Daim ntawv pov thawj:
Ua raws liASME B31.3, API 5L PSL1, thiabTS EN ISO 3183.
Xaiv tauNWS MR0175rau kev pabcuam qaub (H₂S ib puag ncig).
5. Kev txwv kev ua haujlwm & kev ua raws cai
Qhov kub thiab txias: -50 ° F txog 650 ° F (-45 ° F txog 343 ° F).
Max Siab: Tsawg dua lossis sib npaug li 5,000 psi (345 bar) rau Chav Kawm 20.
Cov qauv tseem ceeb:
TS EN ISO 3183(Peline systems).
ASME B31.8(Gas transmission pipelines).
