MANDATORY HARDNESS TEST AFTER PWHT

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MACARIO PALOLA

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Jan 18, 2023, 2:48:58 AM1/18/23
to Materials & Welding
Sirs,

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

Thank you for your reply.


Mac

Vishwas Keskar Welding Manager WELDING

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Jan 24, 2023, 3:58:08 AM1/24/23
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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 
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