[MW:25449] Re: PWHT thickness requirement as per ASME B 31.3 2014

On Tuesday, September 1, 2015 at 2:12:11 PM UTC+5:30, Mohd Siraj 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 ?

 

Dear All Remember now  as per new B 31.3 now this is clear no PWHT is required if Preheat is carried out at temp.-95 Degree centigrade.

But remember one more thing if during pipe welding if inter pass could not be maintained and it have been postponed for next day then again the required temp. for welding have to be maintained. 

    

    but in case any drawing or specifically any client demands for it then it's between purchaser and manufacturer

   Animesh Srivastava 

9726304200

Linde Engineering India Pvt Ltd.

regards,

9726304200

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