Re: [MW:23379] PWHT thickness requirement as per ASME B 31.3 2014

PWHT is exempted for all thicknesses and weld types of P-No 1 base material, subjected to meeting the requirements of  Notes in Table 331.1.3 (such as preheat and multiple layer welds...).

On 1 September 2015 at 12:24, S.Mohammed <mohd52100@gmail.com> wrote:

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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