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Recent content by Abanamat

  1. Abanamat

    Lower temperature of PWHT

    Dear all, Production test coupons were used simulating the whole situation (first incorrect PWHT, and then second correct). Mechanical test report (hardness and impact) showed appropriate results. After that, PWHT on vessel was performed at temperature 620°C min. Thank you all for your help
  2. Abanamat

    Lower temperature of PWHT

    Dear all, In the end we decided to repeat the PWHT. Thank you for your good advise. Regards
  3. Abanamat

    Lower temperature of PWHT

    Dear Dhurjati Sen, Unfortunately, I don't have data about the number of thermocouples, I know only, that PWHT was performed generally below 620°C. Yes, I think we will accept PWHT, because I am also concerned that repeating of PWHT could lead to complications (softening of base material, I...
  4. Abanamat

    Lower temperature of PWHT

    Dear pradipgoswami, SP-0472 is referred as one and only applicable document for this project. We do not refer to API 945... Do you know why there is such a big difference between API and NACE recommendations of PWHT procedure? Why the NACE is stricter? As metengr mentioned above, tempering is...
  5. Abanamat

    Lower temperature of PWHT

    Hello, I have a question about PWHT: Vessel base material is SA-516 Gr.70N, vessel will be exposed to alkanolamine and wet H2S. Our vendor informed us that PWHT was performed slightly below 620°C. However, results of hardness test were below the maximum value of hardness required in H2S...
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