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  1. Lee SiHyoung

    PWHT at the existing piping and reactor for further preventing some HTHA

    I think we have to make an approach from metallurgical aspect. I do agree with that the stress relief from PWHT definitely makes steels less susceptible to crack. However, please note that the mechanism from HTHA is based on the diffusion of H2 and the reaction between Fe3C and H2 rather than...
  2. Lee SiHyoung

    Monel corrosion

    nickypaliwal, Please note that NACE MR 0175 is handling only one type of cracking as sulfide stress corrosion cracking among various kinds of corrosion. Although it is within the limit from NACE MR 0175, it does not ensure the suitability of all of the other types of corrosion. Normally...
  3. Lee SiHyoung

    Monel corrosion

    Referring to NACE Paper 34109 (2009 Edition), Crude Distillation Unit—Distillation Tower Overhead System Corrosion, it is as below. Actually, monel is especially sensitive to "oxygen" in acid service. The typical source of oxygen is as below. I) Oxygen ingress when equipment is opened during a...
  4. Lee SiHyoung

    The application of austenitic stainless steels for instrument as per NACE MR 0175 (ISO-15156)

    Hi.pradipgoswami. Thanks for the reply. But the answer is not so clear to me. What is the meaning of "open ended"? Does that mean Table A.6 which does not have any limitations is not valid or it is something that shouldn't be fully followed? If you can, I appreciate why the different table is...
  5. Lee SiHyoung

    Monel corrosion

    Please check if there is ammonium bisulfide deposition. Even if monel has good corrosion resistance relatively, it is very susceptible to aqueous ammonium bisulfide(NH4HS) corrosion. (Reference from section 7.2.4.4 and figure 9 of API 932-B) For resistance materials recommended, please provide...
  6. Lee SiHyoung

    The application of austenitic stainless steels for instrument as per NACE MR 0175 (ISO-15156)

    Dear Experts, Referring to table A.6 of NACE MR 0175 -3 (ISO-15156-3), the application of austenitic stainless steels seems no limitation from temp,H2S & chloride while there are tougher restrictions in Table A.2. Although it is same materials as austenitic SS with same fluid, does that mean it...

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