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Re: [MW:35507] WPS for Furnace PWHT

By Materials & Welding

As per ASME B31.3, Clause 331.1.6 (b):
Any required PWHT shall be carried out in accordance with the qualified WPS.

For furnace PWHT involving spools of different diameters and varying thicknesses, all weld joints subjected to PWHT must be welded using a WPS qualified with PWHT. This requirement remains applicable even when the individual joint thickness is less than 20 mm, despite the code-specified threshold of greater than 20 mm for P1 materials, as outlined in Table 331.1.1 of ASME B31.3 (2008).

Therefore, performing furnace PWHT on any joint that was welded using a WPS not approved for PWHT constitutes a non-conformance with the applicable quality requirements. Do you agree? If not please elaborate.

Prakash


On Sat, Apr 5, 2025 at 7:52 AM Hareesh K V <hareesh.kitco@gmail.com> wrote:
Dear Sir,

I am not clear about the question.

Is the question is "The welding is done without following a WPS having  PWHT and actually the joints need the same" is it?

May I know the material ?

Also if it is of Carbon Steel material, is PWHT requirment is there based on design or based on ASME 31.3?

Regards,

Hareesh K V

On Mon, 27 Jan, 2025, 11:57 am Prakash Kumar Bontra, <prakashbontra@gmail.com> wrote:
For furnace PWHT as per ASME B 31.3 all the joints in the spool (1" to 36") need PWHT approved WPS and where to refer?

Prakash Bontra

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