1. ASTM A671 CD70 Class 10 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CD70 Chav Kawm 10 yog ibhluav taws xob-fusion-welded (EFW) carbon steel yeeb nkabtsim rauqis-kev pabcuam kub(hauv qab-70 ° F / -57 ° C). Cov ntsiab lus tseem ceeb:
cd70 ua: Cov khoom siv qib yuav tsum tauCharpy V- ntsuas qhov cuam tshuam ntawm -70℃Flos xyuas kom meej cryogenic toughness.
Chav Kawm 10: Yam tsawg kawg nkaus yield zog ntawm10ksi (69 MPa), feem ntau yog siv raulow-cov ntaub ntawv siv cryogenic(piv txwv li, cryogenic cia, industrial gas faib).
2. Nws tsim thiab muaj ntawv pov thawj li cas?
Teb:
Vuam: EFW txheej txheem nrog muab tub lim hlau,100% radiographic (RT) lossis ultrasonic (UT) tshuaj xyuasrau 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 0.30%, Mn Tsawg dua lossis sib npaug li 1.20%) thiab cov txiaj ntsig kev xeem ntawm-70℃F.
3. Chav Kawm 10 piv rau lwm chav ASTM A671 li cas?
Teb:
| Parameter | CD70 Chav Kawm 10 | CD70 22 | cd70 60 |
|---|---|---|---|
| Yield zog | 10ksi (69 MPa) | 22 ksi (152 MPa) | 60 ksi (414 MPa) |
| Daim ntawv thov | Tsawg- siab cryogenic | Nruab nrab -siab | Siab -siab cryogenic |
| Nqi | Nyiaj txiag - phooj ywg | Nruab nrab -ntaus | 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 thickness(raws 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 cov kav dej.
Sab hauv: Epoxy / FBE hauv ob sab phlu rau tshuaj tiv thaiv (xws li, hauv kev pabcuam LNG).
Kev tu: Kev tshuaj xyuas ob xyoos ntawm welds thiab txheej hauv cov xwm txheej cyclic.
