ASME Sec IX QW 207.4 Requirements - Inquiry

[PARAI Reaction Channel]

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.

[Prashant Rane]

Hi

Firstly QW 407.4 has been deleted from ASME Sex IX

I am sure you ment to say QW 407.2 as per edition 2023

Answer to your question is NO

PQR time should be at least 600 minutes

You will have to qualify new procedure.

Regards,

Prashant

On 2 Jun 2025, at 2:55 PM, PARAI Reaction Channel <sarava...@gmail.com> wrote:



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[Anandhapadmanabha pillaim]

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

[George Dilintas]

Allow me to remember that PWHT Time and temperature ranges are supplementary essentia variables, that means applicable only when impact test is a construction Code requirement

Δρ. Γεώργιος Διλιντάς

Ηπείρου 5 , Μελίσσια - 15127

Αεροναυπηγος Μηχανικός - Μελος ΤΕΕ 55018

Τηλ +30 210 8100578, +30 6944 646 204

Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I,  Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

To view this discussion visit https://groups.google.com/d/msgid/materials-welding/CAJ90KGQ_J-U-mXa5orESzZ79paPHMNU2VSRMzVO7HVhhJDXnZw%40mail.gmail.com.