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PWHT for Clad Pipe

PWHT for Clad Pipe

PWHT for Clad Pipe

(OP)
I have Pipe CS A106 thickness 25mm + 3mm Overlay 316L designed follow ASME B31.3. I know that when we design ASME B31.3 all Carbon Steel material have thickness above 19mm shall be performed PWHT. But i don't know Carbon Steel + Overlay need to perform PWHT or not. What range temp PWHT? What problem for Corrosion overlay when we perform PWHT?

RE: PWHT for Clad Pipe

No need to PWHT because the thickness of C.S is below 19mm.

RE: PWHT for Clad Pipe

(OP)
In case thickness CS above 19mm, we need to perform PWHT or not. (CS A106 thickness 25mm)

RE: PWHT for Clad Pipe

The requirement for PWHT for P-No 1 base material in Table 3.3.1 in B31.3 is 20mm or less in thickness (before cladding). Your base metal thickness is below 20mm, so PWHT is not required.

RE: PWHT for Clad Pipe

Under the 2014 edition of B31.3, PWHT would no be required. Under the previous edition it would be.

RE: PWHT for Clad Pipe

Please also note that the designer/Owner may elect not to PWHT when such PWHT would prove detrimental to the service.

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