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Associate

Join Date: Jan 2009
Posts: 32

Welder Qualification Required Seperaely or Not

09/06/2014 7:35 AM

I wanted to carry out Welder qualification for Through thickness Repair(Root) for Cross country pipeline as per API 1104.Material: LSAW, API 5L X 52, 7.9 mm thk.Is it required to do separate welder qualification for Partial repair or the Root repair welder can carry out root & partial repair . Technical reply required.

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Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 630
Good Answers: 34
#1

Re: Welder qualification required seperaely or not.

09/06/2014 9:24 AM

Your question is not clear.

The repair welding in on the longuitudinal or Heli LSAW seam weld (API 5L). Or is on the circumferential weld (API 1104). In any way, if you have the welding procedure (WPS/PQR) approved and the welder approved cualification you dont need another WPS/PQR .

But, I remember you, API 1104 require for repair an approved procedure according with (API 1104 point 10) :

- Method of exploration of defect

-Method of defect removal

-The repair shall be examined to confirm the complete removal of the defect.- Preheat, interpass and post weld treatment (If Require)

- Welding processes ( New qualification if you are going to use a different welding process)

- Requirements for interpass NDE (depending oo Thickness and materials)

.- Final NDE and visual inspection.

WP

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Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#2

Re: Welder qualification required seperaely or not.

09/06/2014 11:04 AM

We only give opinions here. Technical replies must come from someone qualified to give them.

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