1. ASTM A671 CC70 Class 72 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CC70 Chav Kawm 72 yog covsiab tshaj -qib hluav taws xob- fusion-welded (EFW) carbon steel yeeb nkabrauultra-tsawg- kev pabcuam kub(hauv qab-70 ° F / -57 ° C). Cov ntsiab lus tseem ceeb:
CC70 ua: Cov khoom siv qib yuav tsum tauCharpy V- ntsuas qhov cuam tshuam ntawm -70℃Fkom ntseeg tau tias muaj kev tiv thaiv cryogenic puas.
Chav Kawm 72: Yam tsawg kawg nkaus yield zog ntawm72 ksi (500 MPa), tsim rausiab heev -cryogenic systems(piv txwv li, LNG export terminals, siab -pressure ethylene pipelines).
2. Dab tsi yog qhov kev tsim khoom thiab ntawv pov thawj?
Teb:
Vuam: EFW txheej txheem nrog muab tub lim hlau,100% radiography (RT) lossis kuaj ultrasonic (UT)rau weld kev ncaj ncees.
Kev kho cua sov: Kev ntxhov siab-relieved los yog normalized los txhim kho qis -kub ductility.
Daim ntawv pov thawj: Mill test reports (MTRs) suav nrog:
Tshuaj ntsuam xyuas (piv txwv li, C Tsawg dua lossis sib npaug li 0.25%, Mn Tsawg dua lossis sib npaug li 1.40%).
Mechanical zog (yield / tensile zog, elongation).
Impact test results at-70℃F.
3. Chav Kawm 72 piv rau lwm chav ASTM A671 li cas?
Teb:
| Parameter | CC70 72 | CC70 22 | CC65 qeb 72 |
|---|---|---|---|
| Yield zog | 72 ksi (500 MPa) | 22 ksi (152 MPa) | 72 ksi (500 MPa) |
| Daim ntawv thov | Heev - siab cryogenic | Tsawg- cia siab | Zoo sib xws zog, txawv temp range |
| Nqi | Hwm rau kev siv tseem ceeb | Nyiaj txiag - phooj ywg | Piv nrog hwm |
4. Dab tsi yog qhov ntev thiab qhov kam rau ua?
Teb:
Txoj kab uas hla: 16"–120" OD (tus qauv rau loj - nplai cryogenic pipelines).
Phab ntsa Thickness: Ua siab ntev± 10% nominal thicknessRaws li ASTM A671.
Ntev: Feem ntau 40ft (12.2m), nrog kev cai ntev txog 60ft.
5. Yuav ua li cas txhawm rau tiv thaiv corrosion thiab ua haujlwm ntev?
Teb:
Sab nraud:
3 LPE txheej(3-txheej polyethylene) rau faus / submerged pipelines.
Cathodic tiv thaiv nyob rau hauv corrosive ib puag ncig (xws li, ntug hiav txwv dej / chaw lag luam).
Sab hauv:
Epoxy / FBE hauv ob sab phlu rau tshuaj tiv thaiv (xws li, acidic LNG paug).
Kev tu: Kev tshuaj xyuas ob xyoos ntawm welds thiab coatings nyob rau hauv cyclic tej yam kev mob.
