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[MW:35937] PWHT for Piping weld joint | heating & cooling rate

By Materials & Welding

Dear Experts,

Please help review and advise on the acceptability of the attached PWHT record against ASME B31.3 clause 331.1.4 (Heating and Cooling).

From the chart, the overall PWHT cycle appears satisfactory (target/hold achieved and stable). However, there is one localized segment during the HEATING stage (T > 315°C) where the temperature ramp is steep and the heating rate appears to exceed 335°C/h (local/short-duration excursion). All other portions of the cycle look compliant.

Could you please advise:

  1. Whether this single local heating-rate exceedance can be accepted as-is (engineering disposition/justification), or

  2. If not acceptable, recommended corrective actions (e.g., re-PWHT, additional NDE/metallurgical evaluation, etc.).



Best Regards.
-------------------------------------------------------------------
Name :        Le Dinh Hai (Mr Hai)
Mobile :      Vietnam: +8497 397 1597
Email :        Dinhhaibkdn@gmail.com

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