Materials & Welding: [MW:33959] Re: MANDATORY HARDNESS TEST AFTER PWHT

Tuesday, January 24, 2023

It is depending on Design Construction code / Client specification

Normally ASME SEC I , piping, equipment does not call for Hardness test .

As a practice , random hardness checks are carried out to ensure effective PWHT.

Maximum Hardness reading shall not exceed 275 - 280 BHN .

Hardness checking procedure shall outline Testing Method, type of equipment, Operator

API 938 , does specify Hardness of 250 BHN maximum .

Regards

Vishwas - IWE

International Welding Engineer

On Wednesday, January 18, 2023 at 1:18:58 PM UTC+5:30 MACARIO PALOLA wrote:

Sirs,

Is it mandatory to perform hardness test after pwht of P91?
Do we have supporting code?

Thank you for your reply.

Mac

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