Re: [MW:18527] Back gouge requirement of Tank girth weld

Please see the below contractor's procedure and WPS also not mentioned bothside welding simultaneously.

 

 

General Welding Procedure Specification for the

Submerged Arc Welding Process

 

 

 

Wide Gaps:

The following technique shall be used for welding joints with wide gaps which exceed

twice that specified on the applicable contract drawing. When zero gap is specified on

the contract drawings, gaps exceeding 3/16" (4.8mm) shall be reduced as outlined

below to a 3/16" (4.8mm) or smaller gap. Maximum weld build-up shall be T (where

"T" is the thickness of the plate) for each plate edge or 1/2" (12.7mm) whichever is

smaller.

4.4.3.1 Method:

1. Plate edge build-up shall be done with a welding procedure

approved for contract use. Weld passes shall be deposited utilizing

a stringer bead technique to restore the plate edges to the gap and

approximate joint configuration as shown on the contract drawings.

 

 

 

 

 

4.8.4.2 Horizontal:

When the submerged-arc process is used to weld horizontal groove welds,

both sides may be welded simultaneously and no treatment of the back

side of the joint is necessary to ensure complete penetration and fusion.

On Tue, Aug 27, 2013 at 7:04 AM, HAREESH K V <hareesh13h@gmail.com> wrote:

every welding process requires a qualified welding procedure. So you should have a welding procedure for both side welding with SAW. The process of buttering also should have a PQR and WPS.

Secondly, what about your inspection test plan (ITP)?. Certainly there will be inspection requirements in ITP.

If both of the above is not available (PQR and ITP), as a remedial measure do a PQR. If qualified do the NDT as per the code requirements. If the PQR not get qualified, the entire welding has to be removed and rewelded.

May be other good suggestions will be available in this group.

On Mon, Aug 26, 2013 at 10:27 PM, joseph mbé <mbejoseph@yahoo.fr> wrote:

First of all, you should qualify the welding process before the start of the project then, you also have to perform the NDT in accordance with the applicable construction code. RT or UTcould do the job depending on the wall thickness. 

 

J Mbe

QA/QC Engineer

TEL CMR (00237) 33129846

TEL CG (00242) 057388009

mbejoseph@yhaoo.fr

BP 1155 Pointe Noire

Yesterday is the pass, tomorrow is the future; and today? Today is the present, the gift: Enjoy it!

 

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De : Mony Kandan <monykandan@gmail.com>
À : materials-welding@googlegroups.com
Envoyé le : Lundi 26 août 2013 8h24
Objet : [MW:18513] Back gouge requirement of Tank girth weld

Dear Experts ,

 

Kindly suggest on  following issue

 

In our project we have API 650 Tank installation ,during construction activities the contractor didn't carried out backgouge grinding  in girth weld .The process used for saw welding and they made welding  simultaneously inside and outside,and joint configaration like that square butt weld.During fit up activites buttering also done to maintained the gap without any NDT .How we have to ensure that weld is sound weld or not.please give your valuable reply with any code reference.

 

Thanks and Regards

Monykandan.T

 

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Hareesh K V
+91-9447625012

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