Re: [MW:10013] piping modification after PWHT

Hai

 

first of all, SA 106 Gr.B Material above 19mm only we need to do the PWHT. at what specification you are following the PWHT for sch40 pipes.

 

in case of your specification, you have to do PWHT, then you have to go for the new modified joint also. then go for RT.

 

generally, modified weld also must do the similar way for other joints. RT also should take.

 

 

 

 

On Fri, Feb 25, 2011 at 10:02 AM, Abhonkar, Abhay (NAR) <AAbhonkar@dresser-rand.com> wrote:

Dear Sir,

This is case for discussion.

Let us assume that piping for SA106 Gr B pipes are fabricated and radiographed and found OK. Then as per the requirement, next stage is Post weld heat treatment.

Size of the piping is vary between 1 inch sch 80 and extends upto 10 inch sch 40 CS SA106 Gr b NACE material.

 

Now if one completed the PWHT cycle and during mounting of the piping it seems that without doing the re cutting and rewelding it will not fit then, how we should go forward,

 

1)       Can piping accepted by means of radiograph after rewelding and if RT OK then we can go ahead for final hydro test without PWHT.

2)       One has to do again PWHT for that modified joint.

3)       What is AEME verdict about that?

4)       Whether UCS – 56 is mentioned about that, as it will seems that code mentioned about repair weld only and not for new weld after modification.

 

Pl have your views on above.

 

 

Regards,

Abhay

Ext 448

 

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