1. ASTM A671 CF65 Class 13 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CF65 Chav Kawm 13 yog ib qhohluav taws xob-fusion-welded (EFW) carbon steel yeeb nkabtsim rauqis-kev pabcuam kub(hauv qab-65 ° F / -54 ° C). Cov ntsiab lus tseem ceeb:
CF 65: Cov khoom siv qib yuav tsum tauCharpy V- ntsuas qhov cuam tshuam ntawm -65℃Fvalidate cryogenic toughness.
Chav Kawm 13: Yam tsawg kawg nkaus yield zog ntawm13 ksi (90 MPa), haum rauqis-rau- nruab nrab siab siab cryogenic systems(piv txwv li, industrial gas tis, chemical processing pipelines).
2. Dab tsi yog qhov kev tsim khoom thiab ntawv pov thawj?
Teb:
Vuam: EFW txheej txheem nrog cov qauv carbon steel muab tub lim,100% kev tshuaj xyuas qhov muag + 20% RT (kev kuaj hluav taws xob).
Kev kho cua sov: Kev ntxhov siab -relieved (yuav tsum tau thickness > 0.75 nti).
Daim ntawv pov thawj: Mill test reports (MTRs) yuav tsum muaj xws li:
Kev sib xyaw ua ke (piv txwv li, C Tsawg dua lossis sib npaug li 0.22%, Mn Tsawg dua lossis sib npaug li 1.05%, P / S Tsawg dua lossis sib npaug li 0.025%).
Mechanical zog (yield ntau dua los yog sib npaug rau 13 ksi, tensile 70-95 ksi).
Impact tests ntawm-65℃F(min 25 ft-lb avg., 18 ft-lb tus neeg).
3. Chav Kawm 13 piv rau lwm chav ASTM A671 li cas?
Teb:
| Parameter | CF65 Chav Kawm 13 | CF65 Chav Kawm 10 | CF65 Chav Kawm 20 |
|---|---|---|---|
| Yield zog | 13 ksi (90 MPa) | 10ksi (69 MPa) | 20 ksi (138 MPa) |
| Daim ntawv thov | Nruab nrab -siab cryogenics | Tsawg-siab | Siab -siab |
| Nqi | Nruab nrab -ntaus | Kev lag luam | Hwm |
4. Dab tsi yog qhov ntev thiab qhov kam rau ua?
Teb:
Txoj kab uas hla: 16"-144" OD (tus qauv).
Phab ntsa Thickness: Ua siab ntev± 10% nominal thickness(raws li ASTM A671).
Ntev: Feem ntau 40ft (12.2m), txuas mus rau 80ft (24.4m) nrog ob npaug -random lengths.
5. Yuav ua li cas thiaj li tiv thaiv corrosion?
Teb:
Sab nraud:
3 LPE txheej(3-txheej polyethylene) rau ib puag ncig hnyav.
Cathodic tiv thaiv rau faus pipelines.
Sab hauv:
Epoxy lossis FBE hauv ob sab phlu rau tshuaj lom neeg / abrasion kuj.
Kev tu:
Biannual UT thickness checks + xyuas hnub so rau txheej txheej.
