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[MW:1169] Re: Presence of laminations in seamless pipes and fittings

By Materials & Welding
We are use to test (After re-beveling or cutting) before welding. The reason what I know, you may have some acceptable indication before cutting in that location. That indication may become open to surface.
Ref. Below Procedure:

This Procedure describes the Operations which will be used to carry-out repairs to damaged

bevel ends on materials supplied for the Slug Catcher Works associated with the Offshore

Gas Gathering System (OGGS) Project.

The methods described in this Document are based upon the requirements of the

Specifications and proven methods of achieving the required results. It must be

appreciated, however, that these methods may be subject to revision or modification

depending upon conditions and circumstances actually encountered.

Bevel End Repairs

Repairs to damaged bevels will be carried-out as detailed below:

i) Minor damage to bevels will be repaired by grinding and/or filing. After affecting such a

repair, the bevel will be checked visually by the QA/QC Representative.

ii) Major damage to pipe ends, which renders the end preparation unfit for production

welding, will be repaired by initial grinding, followed by repair welding in accordance with

the attached approved WPS (WPS P -1027a, Rev. 0). The welded repair area will be redressed

by grinding. After final grinding, the repaired bevel shall be checked visually and

by Magnetic Particle Inspection (MPI) in accordance with the approved procedure by

the QA/QC Representative for this operation. The results of the MPI shall be recorded

on Form QR-035.

iii) Contractor may also opt to utilize a purpose-built End Facing Machine appropriate for

bevel repairs on straight lengths of pipe. Once the Machine has 'faced' the desired

bevel, the new bevel shall be checked visually and by Magnetic Particle Inspection (MPI)

by the QA/QC Representative in accordance with the approved procedure for this

operation, and the results recorded on Form QR-035.
 
S.Senthilkumar


--- On Sat, 20/9/08, Sankepalli R.S.Reddy <sankepalli.rsreddy@gmail.com> wrote:
From: Sankepalli R.S.Reddy <sankepalli.rsreddy@gmail.com>
Subject: [MW:1148] Presence of laminations in seamless pipes and fittings
To: materials-welding@googlegroups.com
Date: Saturday, 20 September, 2008, 8:19 PM

Dear All,
 
As per Aramco company specification, Fittings that are re-cut or re-beveled shall have the cut surface examined for laminations before welding.
 
Now my question is
 
1. What are the chances of getting laminations in seamless pipes and fittings that are manufactured from seamless pipes.
 
As per my understanding of this clause, only fittings and pipes that are fabricated from plate should be checked for laminations after cut and re bevelling.
 
Expert comments requested.
 
Thanks and regards
 
 

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