Re: [MW:29766] ASME B31.3 2016 Ed - PWHT table

As per ASME B31.3 2016 when preheat of 95 Deg C for greater than 25 mm thk, PWHT is not mandatory.

ASME B313.3 does not ask to perform PWHT if above mentioned conditions are fulfilled.  How ever there are client specifications and if the design is as per the previous Editions of B31.3 PWHT may need to be performed.  This will have to be decided in discussion with client.

Regards,

 

Prashant P Rane

00971 50 6110308

On Thu, Jun 27, 2019 at 2:17 PM PARAI Reaction Channel <saravanshyla@gmail.com> wrote:

Dears ,

Could you please let me know whether PWHT is required for piping as per ASME B31.3, 2016 Edition for the P No. 1 Gr.1 welded to itself and also welded with  P No. 1 Gr.2 up to 25 mm thickness of welds, as per the Table 331.1.1.

Also, there is an exemption given in Table 331.1.3, when we preheat of 95 Deg C for greater than 25 mm thk. Hence I am asking this query.

Please check and let me know.

With best regards,

Saravanan Sornam,

Korea

.

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