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Re: [MW:35659] ASME Sec IX QW 207.4 Requirements - Inquiry

By Materials & Welding
Dear Saravan,

Based on this PQR, you can only write a WPS with a maximum PWHT soaking time of 562.5 minutes. Any soaking time beyond this limit is not permitted under ASME Section IX, Edition 2023.

If a WPS has been prepared using this PQR with a soaking time of 750 minutes, it is not acceptable, and the procedure must be requalified. The new PQR must demonstrate a minimum soaking time of at least 580 minutes to support such extended durations.

Additionally, for repair work that requires further PWHT cycles, an additional qualification cycle will be necessary to accommodate the increased PWHT requirements.

M Anandhapadmanabha Pillai 
IWE/IEng/AWeldl

On Mon, 2 Jun 2025, 2:55 pm PARAI Reaction Channel, <saravanshyla@gmail.com> wrote:
Dear Sirs,

I have an urgent inquiry.

We have a PQR qualified for P No.1, Gr.1 to 2, 45mm thk, PWHTd and Impact tested at -66 Deg C, where the holding temperature is 625 ± 25 Deg C, holding time is 450 Minutes.

It was an old PQR and I do not know the reason for such a long holding time kept during that time , as I am new to this company.

We have used this PQR for the fabrication of  a vessel, P No.1 Gr.1 & 2, design code is ASME Sec VIII Div-1, PWHT exists and Impact test is -29 Deg C.

But during heat treatment, the holding temperature is 640 Deg C, but the holding time is 750 Minutes, done by the PWHT subcontractor, even though we informed to keep holding time as 450 minutes with reference to the PQR.

As per ASME Sec IX, QW-407.4, especially this 750 minutes holding time still acceptable ?

We need to justify the client, if they ask to clarify.

Please advice.

Regards,
Saravanan Sornam,
S.Korea.

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