1. ASTM A671 CA55 Class 20 Steel Pipe yog dab tsi?
A:Nws yog ibhluav taws xob-fusion-welded (EFW) carbon steel yeeb nkabtsim rauultra-siab-siab (20,000 psi hydrostatic test) thiab qis- kev pabcuam kub(hauv qab-50 ° F / -45 ° C).
"CA55": Qhia meej txog tshuaj chemistry (C, Si, Mn) thiab yuav tsum tau uaCharpy impact testrau cryogenic toughness.
Ntsiab nta: Kev tshuaj ntsuam xyuas hluav taws xob tag nrho, tom qab-weld heat treatment (PWHT), thiab ua raws liASTM A671 Cov Lus Qhia Tshwj Xeeb.
Kev siv yam: Offshore roj rigs, siab - siab kis tau tus mob gas, thiab cryogenic cia systems.
2. Chav Kawm 20 Piv rau Lwm Chav Kawm li cas (xws li Chav Kawm 12/13)?
A:
Kev ntsuas siab: Chav kawm 20 =20,000 psi(vs. 12K/13K rau Chav Kawm 12/13).
Phab ntsa Thickness: Cov tuab tuab tuab dua li cov chav kawm qis, ua kom muaj kev ntseeg ruaj khov nyob rau hauv qhov siab heev.
Daim ntawv thov: Tso tseg rau qhov xav tau tshaj plaws siab - qhov chaw siab uas cov chav kawm qis tsis txaus.
3. Yuav tsum muaj cov qauv thiab kev xeem dab tsi?
A:
Thawj Standard: ASTM A671 (EFW kav dej rau qis-kev pabcuam kub).
Kev ntsuam xyuas tseem ceeb:
Hydrostatic Test: 20,000 psi yam tsawg kawg nkaus.
NDT: 100% radiographic (RT) los yog ultrasonic (UT) weld soj ntsuam.
Charpy Impact Test: Ua ntawm-50 ° F / -45 ° Ctxhawm rau xyuas kom tawg tsis kam.
Nco tseg: Ua raws liASME B31.3rau txheej txheem piping thiabAPI 5Lrau kab yeeb nkab kuj siv tau.
4. Dab tsi yog qhov tseem ceeb Fabrication thiab Vuam Requirement?
A:
Vuam txheej txheem: Submerged arc welding (SAW) los yog sib npaug, ua kom muaj kev nkag mus rau tag nrho thiab qhov tsis xws luag - dawb welds.
PWHT: Yuav tsum tau tshem tawm cov kev ntxhov siab seem thiab txhim kho cov khoom siv.
Dimensional Tolerances:
OD: ± 0.8% ntawm nominal txoj kab uas hla.
Phab ntsa thickness: ± 10%.
Kev Ncaj Ncees: Tsawg dua lossis sib npaug li 0.2% ntawm qhov ntev.
5. Chav Kawm 20 Pipes feem ntau siv nyob qhov twg?
A:
Roj & Roj: Ultra-siab- cov kav dej siab, subsea risers, thiab chaw nres tsheb roj compression.
Zog: Nuclear tsob nroj coolant systems, siab -siab chav kab.
Kev lag luam: Hydrogen thauj, cryogenic siab hlab ntsha.
