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[MW:9994] piping modification after PWHT

By Materials & Welding

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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