1. Dab tsi yog qhov tseem ceeb ntawm qib "L" (piv txwv li, 304L vs. 304)?
Teb:Lub "L" sawv cev rau "Low Carbon." Qib zoo li 304L muaj cov ntsiab lus siab tshaj plaws ntawm 0.03%, piv rau 0.08% rau cov qauv qib. Cov ntsiab lus qis carbon no txo qis qhov tsim ntawm chromium carbides thaum vuam ("sensitization"), uas khaws cia corrosion kuj nyob rau hauv tshav kub- cuam tshuam cheeb tsam (HAZ).
2. Tus txheej txheem Hydrostatic Test rau A312 yeeb nkab yog dab tsi?
Teb:Txhua qhov ntev ntawm cov yeeb nkab yuav tsum tau ua qhov tsis yog -kev puas tsuaj hydrostatic test. Kev ntsuas siab yog xam los ua kom muaj kev ntxhov siab nyob rau hauv cov yeeb nkab phab ntsa sib npaug rau qhov tsawg kawg nkaus yield zog (SMYS) ntawm qib, tab sis yuav tsum tsis pub dhau qee qhov kev txwv. Cov yeeb nkab yuav tsum tuav lub siab no yam tsis muaj dej.
3. Dhau li ntawm kev kuaj hydrostatic, dab tsi lwm yam uas tsis yog -kev kuaj kev puas tsuaj (NDT) feem ntau tau teev tseg?
Teb:
Eddy Current Testing (ECT):Feem ntau siv rau cov yeeb nkab uas tsis yog -welded (seamless) raws li qhov ceev, automated check rau cov teeb meem loj.
Kev kuaj ultrasonic (UT):Siv rau cov yeeb nkab welded los tshuaj xyuas qhov kev ncaj ncees ntawm lub vuam seam yam tsis muaj kev sim hydrostatic.
Kev Ntsuas Hluav Taws Xob (RT):Lwm txoj hauv kev rau UT rau kev tshuaj xyuas qhov vuam seam, muab cov duab ntawm cov weld sab hauv.
4. Tus lej "Sch" (xws li Sch 40, Sch 80S) qhia li cas?
Teb:"Sch" sawv cev rau Schedule. Nws yog cov txheej txheem tsim los ntawm ASME B36.19M uas txhais cov phab ntsa tuab ntawm cov yeeb nkab rau qhov muab cov yeeb nkab nominal loj (NPS). Lub sij hawm ntau dua txhais tau tias yog phab ntsa tuab thiab siab dua qhov ntsuas. Tus "S" hauv "Sch 80S" sawv cev rau "Stainless," qhia txog cov tuab tuab tshwj xeeb rau cov kav hlau stainless.
5. Nyob rau hauv dab tsi industries yog ASTM A312 yeeb nkab feem ntau siv?
Teb:Nws yog dav siv nyob rau hauv kev lag luam uas tuav cov kua dej corrosive los yog xav tau siab - kub lub zog thiab kev huv, suav nrog:
Roj & Roj (sab sauv, nruab nrab, qis)
Chemical & Petrochemical ua
Pharmaceutical & Bio-tech
Khoom noj khoom haus & dej haus
Lub zog tiam
Pulp & Ntawv
