Re: [MW:15219] UCS-79: Stress relieving after forming

Hi Mustaq,

 

No need to do SR of dish head separately, one time PWHT of whole vessel will be enough unless Client's Project specification calls for normailising treatment for dish heads (Australian standard calls for this normalising treatment for cold formed heads).

 

Please go through the followin ASME interpretation given on the subject

 

Interpretation: VIII-1-95-50
Subject: Section VIII, Division 1 (1992 Edition, 1993 Addenda); UCS-79(d)
Date Issued: March 13, 1995
File Number: BC94-684
Related Documents:

Question (1): A cold formed head has to be heat treated to fulfill the requirements of UCS-79(d) in Section VIII, Division 1. Does the term "heat treated subsequently" mean just after forming and prior to any other operation?

Reply (1): No.

Question (2): If Reply (1) is no, then will PWHT in accordance with UCS-56 satisfy the requirements of UCS-79(d) following welding of the head to the vessel?

Reply (2): Yes.

 

 

Thanks

 

Murugesan

On Tue, Sep 4, 2012 at 4:38 AM, Mushtaq <mushtaq.mems@gmail.com> wrote:

Dear Experts

 

As per UCS-79: Stress relieving should be carried out if the fibre elongation is greater than 5%.

 

if vessel do not have PWHT, stress relieving should be performed "after forming & before any welidng on formed part"

 

My concern is if vessel have PWHT, whether the stress relieving heat treatment shall be performed "after forming & before any welding on formed part" or can be heat treated along with vessel PWHT?

 

your valuable guidance with code references will be highly appreciated.

 

Regards

 

 

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