Re: [MW:31410] PWHT Thickness Requirements.

Hello Mr. Ghulam,

Yes you can perform PWHT for any P No. even it's exempted as per B 31.3.

For P8 ,yes you can. We advise to perform the PWHT for stabilized SS grades of higher thickness (could be beyond 20 mm ) to avoid the Stress Relaxation cracking. 

But in general it's not required.

Br,

Atul 

On Tue, Sep 8, 2020 at 11:01 AM Ghulam Mustafa <gmt.lah@gmail.com> wrote:

Hello all members,

can we perform PWHT except P1 material.

(such as P8)

Best Regards

GMT

On Tue, Sep 8, 2020 at 9:41 AM atul khatri <atul.mnnit@gmail.com> wrote:

Hello Mr. Andrew,

ASME B31.3 states the general guidelines for PWHT requirements irrespective of fluid service.

Please follow the service specific standards like API RP 941 for Hydrogen service at elevated temperatures , NACE MR0103 etc.

Client requirements may also supersede the code requirement.

Feel free to discuss more.

Thanks & Regards 

Atul Khatri

On Mon, Sep 7, 2020 at 5:22 PM 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:

There are reasonable changes in ASME B31.3 2018 edition which exempts PWHT if applied a Preheat of 95degC for P1 materials. Please check.

Thanks & Regards

J.Gerald Jayakumar

On Monday, 7 September, 2020, 06:26:18 pm GMT+7, 'Sankaran Sp' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Dear Mr.Andrew,

irrespective of code, for P1 type material with 25mm and above thickness, after pre- heating & welding. PWHT is recommended one and it will reduce the HAZ hardness & eliminating the failure during service.  

Regards,

Sankaran.SP

Welding & Metallurgy expert

On Monday, 31 August, 2020, 07:57:49 pm IST, Andrew Ubakwem <andyubakwem@gmail.com> wrote:

Dear all

Pls what is the current thickness requirements for PWHT as per ASME B31.3? 

I came across old version of the code, it specifies that PWHT not required for all P1 materials, provided min preheat is maintained at 95deg'C.

We intend welding; 18" sch 80(23.83mm) to ASTM A 106, 24" sch 80(30.8mm), is PWHT required? Cite relevant Code sections Please.

Regards,

Andrew. 

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