NACE MR0175 yog dab tsi?
NACE MR0175 (tam sim no sib haum nrogTS EN ISO 15156) yogntiaj teb no benchmark rau qaub cov khoom sivhauv kev lag luam roj thiab roj. Lub npe hu ua "Petroleum and natural gas industries-Cov khoom siv rau hauv H₂S-muaj ib puag ncig," nws lub hom phiaj tseem ceeb yog los tiv thaivSulfide Stress Cracking (SSC).
Nyob rau hauv ib puag ncig "qaub", tus qauv hlau yog raug rau hydrogen embrittlement thiab brittle puas. NACE MR0175 ua haujlwm raws li cov lus qhia tseem ceeb rau kev xaiv cov ntaub ntawv uas tuaj yeem tiv taus cov kab mob corrosive.
Cov yam ntxwv tseem ceeb thiab cov kev txwv tseem ceeb
Cov qauv no feem ntau yog hom phiajdej ntwskev ua haujlwm (kev tsim khoom thiab sib sau ua ke). Nws cov ntsiab lus tseem ceeb suav nrog:
Environmental Txhais: Txhais "kev pabcuam qaub" feem ntau yog ib puag ncig nrog H₂S ib nrab siab Ntau dua lossis sib npaug rau 0.0003 MPa (0.05 psi).
Hardness txwv: Rau cov pa roj carbon thiab qis - alloy steels, qhov siab tshaj plaws hardness ntawm22 HRC(los yog 250 HV) yog "txoj cai kub" los tiv thaiv kev tawg.
Kev xaiv khoom: Qhia meej txog daim ntawv thov txwv rau Corrosion Resistant Alloys (CRAs) zoo li austenitic stainless hlau, duplex steels, thiab npib tsib xee alloys raws li qhov kub thiab txias thiab cov tshuaj chloride.
Kev tsim khoom: Kev tswj hwm nruj ntawm kev kho cua sov thiab cov txheej txheem vuam kom ntseeg tau cov khoom siv zoo thaum lub sijhawm ua haujlwm.
Scope thiab Structure
Tus qauv yog tsim los rau hauv peb qhov chaw, npog tag nrho cov saw hlau los ntawm lub qhov dej mus rau qhov chaw:
Ntu 1: Cov ntsiab cai dav dav thiab cov cai rau kev tawm tsam rau SSC.
Ntu 2: Daim ntawv thov rau Corrosion Resistant Alloys (CRAs).
Ntu 3: Cov kev xav tau rau cov pa roj carbon monoxide thiab qis- alloy steels nyob rau hauv ntub dej H₂S ib puag ncig (suav nrog cov qub NACE MR0103).
Kev lag luam tus nqi
Rau kev muag khoom thiab kev yuav khoom, NACE MR0175 yog tusdaim ntawv tso cai ua haujlwmnyob rau hauv qaub teb. Rau cov haujlwm uas muaj cov ntsiab lus H₂S siab, cov khoom yuav tsum ua raws li tus qauv no, feem ntau yuav tsum tau kuaj SSC (xws li, NACE TM0177) thiab ntawv pov thawj. Nws yog thawj qhov kev tiv thaiv tiv thaiv cov cuab yeej siv puas tsuaj tsis ua haujlwm thiab ua kom muaj kev nyab xeeb ntawm kev ua haujlwm.
