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PWHT and hardness testing

PWHT and hardness testing

PWHT and hardness testing

(OP)
Hello.

I am working on the quality control for the installation of a steam header. The material is 2.25% Cr steel (P22).
The header was prefabricated in a shop, but will require several field welds. Regarding PWHT of the field welds, how relevant is hardness testing as a quality control step for checking stress relieving? What do we do with high readings? Is hardness testing typically used for this purpose?

Thank you.

RE: PWHT and hardness testing

For a steam header, hardness testing is typically not required. Under B31.3, hardness testing would be required to be under the specified maximum.

RE: PWHT and hardness testing

Quote:

Regarding PWHT of the field welds, how relevant is hardness testing as a quality control step for checking stress relieving?

Very relevant. Use this information along with the PWHT charts to ensure it was done correctly.

Quote:

What do we do with high readings?

Usually a few extra readings are taken in the near vicinity as the high readings. If the extra readings are also high, check the entire circumference of the weld/HAZ to determine if another PWHT is required. Develop a repair plan if necessary.

Quote:

Is hardness testing typically used for this purpose?

Yes.

RE: PWHT and hardness testing

I have seen few contractors and owner/users specify hardness testing for ASME Section I, Cr-Mo (P-No 4 and P-No 5A) materials to verify PWHT. This is not to say hardness testing should not be done, and the Code committee recognizes this because it is not a requirement.

If the repair contractor is reputable and has dealt with these materials based on their track record, I would say most clients would not require hardness testing as an additional QA/QC step only because of schedule and cost.

RE: PWHT and hardness testing

(OP)
Thank you, all, for your responses.

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