Re: [MW:5855] Re: STRESS RELIEVING REQUIREMENT

Dear All,

 

I have a different opinion about heat treatment requirements.

 

Please refer ASME B31.3 Para 331.2.2, where exceptions to the basic requirements (par 331.1/ table 331.1.1) is given.

The designer can specify more less stringent requirement as per service/ design consideration/ condition.

 

This includes heat treatment & hardness for lesser thickness or  higher thickness including none.

 

Regards,

Sanjeevan

 

 

----- Original Message -----

From: "Raghuram Bathula" <raghurambathula@gmail.com>

To: "Materials & Welding" <materials-welding@googlegroups.com>

Sent: Sunday, July 04, 2010 5:15 PM

Subject: [MW:5852] Re: <Security Level 2>STRESS RELIEVING REQUIREMENT

Still you need go by your design code and follow whichever is
stringent.

On Jul 4, 6:09 pm, des...@toyoindia.com wrote:
> <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 <raghurambath...@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, <des...@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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