Hi! My interpretation is as given in RED Regards Hegde P.B.
--- On Sat, 15/9/12, DOKKU AJAY <akdd83@yahoo.com> wrote:
From: DOKKU AJAY <akdd83@yahoo.com>
Subject: [MW:15315] API 5LD - Weld OVerlay Pipe, NDE requirements
To: materials-welding@googlegroups.com
Date: Saturday, 15 September, 2012, 7:24 PM
| Dear Experts, Kindly go through the below case and the query. Your interpretaion of the requirement of API 5LD will be helpful. Case: We have to weld overlay on the inside of 36" NPS pipe (7 Mtr Long) with Inconel 625. Minimum 2 layers to be deopisted for final CRA thickness of 3.2mm minimum. The Pipe is having a Long seam and is in accordance with API 5L PSL2. My Query: 1. Whethter these overlayed pipes can be considered as Welded Clad Pipe? If yes, then (Yes it is welded pipe) 2. Whether the radiogrpahy in accordance with Clause 11.1.1 of API 5LD is to be done throughtout the length of the long seam before weld overlay or after weld overlay.(Its Long seam is required to be RT before overlay ,This is to ensure defect free joint to take care of its strength point of view And after overlay its not mandatory, howevr This joint is RT tested to check for soundness of joint from crack point of view only in Overlay As overlay is not considered for strength but only corrosion resistance) 3. When the 36" NPS pipe is supplied by other vendor with radiogrpahy as per API 5L PSL2 and the weld overlay is done by us on the inside of the pipe, does the clasue 11.2 of API 5LD is applicable in this case.( In this case if vendor has supplied with RT then you need not go for Re RT of joint) 3. What all NDE is applicable in this case.( For Overlay you can go for LPT and chemistry of overlayed as per spec.)
Regards,
Dokku Ajay Kumar
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