Re: [MW:23384] PWHT thickness requirement as per ASME B 31.3 2014

HI Mohd,

 

As per ASME B31.3 Edition2014, there is the exception for PWHT for P1 Carbon steel materials.

 

A1.: Regardless of thickness, no PWHT for P1 Carbon steel Material if they meet the Limitation mentioned on the Table 331.1.3.

 

A2.: For carbon steel thickness > 25mm thickness, preheat of 95deg is an limitation for P1 material for avoiding PWHT.

 

Regards,

 

M. Sivachidambaram.

QHSE ENGINEER

GATES ENGINEERING & SERVICES.

On Tue, Sep 1, 2015 at 12:24 PM, 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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