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[MW:25086] Re: PWHT thickness requirement as per ASME B 31.3 2014

By Materials & Welding
My understanding is 

ASME B31.3 2014 comes to be more stringent,
Less than 5mm, PWHT is required.
More than 5mm, PWHT can be exempted if Multi-lay welded. (In my point of view, each pass can assist heating to bottom layer)
More than 25 mm, PWTH can be exempted if Preheat is conducted.



On Tuesday, November 17, 2015 at 12:37:16 PM UTC+3, GrazG wrote:
I confirm for ASME B31.3-2014 all tickness of Group P1 the PWHT is not required. The only prescription is the PREHEAT at 95 °C for thickness >25 mm.
This is my interpretation, correct me if i'm wrong!

Il giorno martedì 1 settembre 2015 10:42:11 UTC+2, Mohd Siraj ha scritto:
Dear all,

As old ASME B31.3-2012  we know it was above 19mm req pwht,

now i read ASME B31.3-2014,little confused me with pwht exemption and pwht requirements and control thickenss 331.1.3?

q1- what is thik req for pwht for P1 as per b31.3 2014 ?

q2 : for P1,mentioned more than 25mm thk and 95C preheat exemption from pwht so less than 25mm not require pwht ?


regards,
mohd.

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