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  1. kondori

    Inadequate PWHT holding time for Carbon Steel piping in caustic service (NACE SP-0403)

    Thank you, EdStainless, for your reply. Update: Today, I found out that originally, they have been following the specification and performing PWHT acc. to NACE SP-0403. The reason why they have changed things and reduced the holding time & temperature has been due to excess distortion and...
  2. kondori

    Inadequate PWHT holding time for Carbon Steel piping in caustic service (NACE SP-0403)

    Our PWHT meets the requirements of ASME B31.3. That's not the issue. The issue is that we did not meet the NACE SP-0403 requirements.
  3. kondori

    Inadequate PWHT holding time for Carbon Steel piping in caustic service (NACE SP-0403)

    Dear all, We have a situation in our project (petrochemical plant construction) where in our caustic service piping (mostly 4-6mm wall thickness and small OD), all the weldments have been post-weld heat-treated, but it has been done acc. to ASME B31.3 (not as per NACE SP-0403 requirements). The...

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