1. ASTM A671 CA55 Class 13 Steel Pipe yog dab tsi?
A:Nws yog ibhluav taws xob-fusion-welded (EFW) carbon steel yeeb nkabtsim rausiab-siab (13,000 psi hydrostatic test) thiab qis- qhov kev pabcuam kub(hauv qab-50 ° F / -45 ° C).
"CA55": Qhia chemistry tswj (C, Si, Mn) thiab yuav tsum tauCharpy 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: LNG pipelines, siab -pas kis tau tus mob, thiab tshuaj ua cov nroj tsuag.
2. Chav Kawm 13 Muab piv rau Lwm Chav Kawm li cas (xws li Chav Kawm 12/20)?
A:
Kev ntsuas siab: Chav kawm 13 =13,000 psi(vs. 12K rau Chav Kawm 12, 20K rau Chav Kawm 20).
Phab ntsa Thickness: Thicker dua Class 12 tab sis sib dua li Class 20, optimizing zog - rau - luj piv.
Tus nqi -Kev ua tau zoo: Sib npaug kev ua tau zoo thiab tus nqi rau nruab nrab -ntau yam siab- cov ntawv thov siab.
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: 13,000 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: Ntxiv ua raws liASME B31.3rau txheej txheem kav dej yuav 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.
PWHT: Yuav tsum tau txo qis kev ntxhov siab thiab txhim kho ductility.
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 13 Cov kav dej feem ntau siv nyob qhov twg?
A:
Roj & Roj: Siab- cov kab hluav taws xob siab, cov neeg tawm sab nrauv.
Zog: Fais fab nroj tsuag chav conduits, cryogenic cia tso tsheb hlau luam.
Kev lag luam: Pressurized ammonia / ethylene thauj tshuab.
