1. ASTM A671 CC60 Class 21 yog dab tsi?
Txhais: High-Kev ua tau zoo EFW yeeb nkab raucryogenic thiab nruab nrab - kev pabcuam siab, engineered rau kev lag luam thiab kev siv hluav taws xob xav tau kev txhim kho lub zog.
Ntsiab Spec:
Yield zog: 60 ksi (414 MPa) ntawm-20 ° F (-29 ° C).
Kev ntsuas siab: 6,000 psi (414 bar)(Kub 21).
Khoom siv: Carbon steel nrogcuam tshuam - kuaj cov khoom(Charpy V-ntaus ntsuas).
2. Cov ntawv thov ib txwm
Roj & Roj:
Siab -cov kav xa hluav taws xob siab.
LNG davhlau ya nyob twg cryogenic piping.
Kev lag luam:
High -siab chav tsev/dej tshuab.
Cov nroj tsuag ua tshuaj (tsis yog-cov kua dej corrosive).
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 (9,000 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 kuaj xyuas.
Tom qab-weld heat treatment (PWHT) 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 6,000 psi (414 bar) rau Chav Kawm 21.
Cov qauv tseem ceeb:
TS EN ISO 3183(Peline systems).
ASME B31.8(Gas transmission pipelines).
