Re: [MW:5851] STRESS RELIEVING REQUIREMENT

<Security Level 2>                                                                                                                                                                                                                                                                                                                                                                                                                                
Thank you. Even our understanding the same.

But, in our project for various piping classes Licensor's / PMC specifications specify the PWHT requirement.
Four variables are being use.

For Process Carbon Steel Piping class : PWHT : As per ASME B31.3 (That means above 20mm thickness)
For all NACE Service piping classes (Carbon Steel) : PWHT : YES  (that means for all thickness unlike code)
For Steam service class : PWHT : IBR (we concluded similar to B31.3)
For all Alloy steel Piping class : PWHT : YES (that means for all thickness unlike code)
For certain steam service class PWHT : As per ASME B31.1 (That means above 20mm thickness)

For Category "D" fluid service Piping class : PWHT : NO (hence, the question)

Not able to interpret the philosophy.

Thanks & Regards,
Dhwani Desai.
TOYO - PLANNING & PIPING DEPT.
91-22-2573 7681.

Raghuram Bathula <raghurambathula@gmail.com> Sent by: materials-welding@googlegroups.com 07/04/2010 06:24 PM Please respond to materials-welding@googlegroups.com

To materials-welding@googlegroups.com cc Subject Re: [MW:5850] <Security Level 2>STRESS RELIEVING REQUIREMENT

It is required for all P1 material >20mm, irrespective of fluid service.

On Sun, Jul 4, 2010 at 5:54 PM, <desaid@toyoindia.com> wrote:

Hello,

As per ASME B31.3; for CS material PWHT requirement is above 20mm.
Is this applicable to category D fluid service class also?

Or code has given liberty to skip PWHT for category D fluid service even though thickness is greater than 20mm.

Pls. advise.

Thanks in advance,

Thanks & Regards,
Dhwani Desai
Planning & Piping Dept.
Ext.-7681

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