NACE MR0175 yog dab tsi
NACE MR0175, lub npe hu ua ISO 15156, yog tus qauv thoob ntiaj teb uas muab cov kev cai thiab cov lus pom zoo rau kev xaiv thiab tsim nyog cov khoom siv hlau rau cov khoom siv hauv cov roj thiab roj ntau lawm hauv ib puag ncig uas muaj hydrogen sulfide, H2S. Hauv kev lag luam cov chaw no yog hu ua kev pabcuam qaub. Tus txheej txheem muaj peb ntu: cov ntsiab cai dav dav rau kev xaiv kev tawg- cov ntaub ntawv resistant, yuav tsum muaj cov pa roj carbon monoxide thiab qis- alloy steels, thiab cov kev cai rau corrosion- cov hlau tsis muaj zog.
Tiv thaiv Brittle Failure
Lub hom phiaj tseem ceeb ntawm tus qauv yog los tiv thaiv sulfide kev nyuaj siab tawg thiab lwm yam hydrogen{0}}induced cracking. Thaum H2S nyob rau hauv lub xub ntiag ntawm dej, nws tso tawm hydrogen atoms nkag mus rau hauv cov hlau. Yog tias cov hlau hnyav dhau los yog muaj kev ntxhov siab, nws yuav tawg thiab poob sai sai, feem ntau tsis muaj kev ceeb toom lossis ua ntej thinning ntawm cov hlau.
Teem Hardness txwv
Txoj cai nto moo tshaj plaws hauv NACE MR0175 yog qhov txwv hardness. Rau cov pa roj carbon thiab qis- alloy steels, qhov hardness feem ntau txwv rau qhov siab tshaj plaws ntawm 22 HRC. Tus txheej txheem tsim kom muaj cov hlau softer tshaj qhov kev txwv no tsawg dua yuav ua nkig thiab tawg hauv qhov chaw qaub.
Kev xaiv khoom thiab kev kho cua sov
Tus qauv qhia tias cov ntaub ntawv twg tsim nyog rau kev pabcuam qaub thiab yuav tsum tau kho li cas. Nws feem ntau tuav cov txheej txheem quenched thiab tempered los yog normalized los xyuas kom meej ib tug zoo grain qauv, yuav tsum tsis muaj theem ntawm impurities xws li sulfur thiab phosphorus, thiab txwv ntau npaum li cas cov hlau yuav txias - tsim, txij li thaum txias ua hauj lwm nce hardness thiab nyob rau hauv kev ntxhov siab.
Defining Sour Environments thiab Scope
NACE MR0175 muab cov qauv los xam qhov siab ib nrab ntawm H2S thiab txiav txim siab ntawm qhov twg lub qhov dej yuav qaub txaus kom xav tau cov ntaub ntawv tshwj xeeb, feem ntau yog thaum H2S ib nrab siab tshaj 0.05 psi. Tus qauv siv tau rau yuav luag txhua yam khoom siv hlau hauv cov kwj deg, suav nrog OCTG casing thiab tubing, cov kav dej, qhov dej, qhov qub, cov kav dej, thiab cov hlab ntsha siab.
Cov lus nug nquag
Q: Puas yog NACE MR0175 zoo ib yam li ISO 15156?
A: Yog lawm, lawv tau sib haum raws li ANSI / NACE MR0175 / ISO 15156.
Q: Dab tsi hardness txwv siv rau carbon steel?
A: Feem ntau 22 HRC siab tshaj plaws.
Q: Puas yog NACE ua raws cai tiv thaiv txhua qhov kev xeb?
A: Tsis yog, nws tiv thaiv kev ntxhov siab tawg; qhov hnyav dav dav - poob corrosion tseem xav tau kev tswj hwm.
Q: Dab tsi yog qhov kev txiav txim siab?
A: Feem ntau thaum H2S ib nrab siab tshaj 0.05 psi.
Q: Cov khoom siv dab tsi nws npog?
A: Casing, tubing, pipelines, wellheads, li qub, thiab ua cov hlab ntsha.
Q: MR0103 yog dab tsi?
A: Lub downstream refinery version ntawm tus qauv rau kev pabcuam qaub.
Rau NACE-ua raws li casing thiab tubing hais nrog cov ntaub ntawv xeem,tiv tauj peb pab neeg muag khoom.
