PFHT & PWHT SAME CYCLE 2

[Deepak Patil]

Dear all,,

If PFHT & PWHT CYCLE IS SAME,SO CAN WE CONDUCT PFHT IN A LAST MOVEMENT IN A PWHT.

IS IT ALLOW ASME CODE....?

PLEASE GUIDE...

 

[mk3223]

ASME Interpretation

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

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.

 

[weldstan]

A star for you. This is how we interpreted Code back in the 1970's and '80's as well.

 

[EdStainless]

While the code allows this there may be cases (alloy, extent of forming) where you really want to PFHT before you weld on the component.
You need to evaluate those risks before you choose to do this.

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P.E. Metallurgy, Plymouth Tube