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[MW:1543] Re: Min Separation of welds

By Materials & Welding
Friends,

This is followed in PDO (Oman) and this is the extract from standar.

Weld separation The toes of adjacent circumferential welds shall be separated by a minimum distance equal to the nominal outside diameter of the pipe. Where the above requirement cannot be met, the minimum distance between the toes of adjacent circumferential welds shall not be less than five times the nominal wall thickness or 50 mm whichever is greater. Both joints shall be subjected to Radiographic, MT or PT and
this specification. The field hardness procedure shall be qualified in accordance with ASTM E110-82

Regards,
Bala.




On Tue, 10 Feb 2009 15:50:24 +0530 wrote
>No such requirement in code (B31.3) for min separation, it always from
>the client standards or the engineering guidelines issued at the
>beginning of the project, one such is attached herewith gives some idea,
>which we have used for one of the project in mid 90's.
>
>150mm as given below by Mr Nilesh for circumferential welds is normal
>engineering practice (I think Aramco or UOP standards specify similar
>requirement) followed by most of the pipe fabricators.
>
>As far as I know PFI ES7 gives min spacing for welded nozzles.
>
>EN 13480-3 also give similar requirement for branch welds (refer fig.
>8.4.1-2)
>
>Members pl. share if any other codes gives such requirement.
>
>
>
>________________________________
>
>From: materials-welding@googlegroups.com
>[mailto:materials-welding@googlegroups.com] On Behalf Of Zameer Mohammed
>Sent: Tuesday, February 10, 2009 2:32 PM
>To: materials-welding@googlegroups.com
>Subject: [MW:1537] Re: minimum length
>
>
>
>Dear Mr. Nilesh,
>
>
>
>Could you pls give the reference paragraph in the ASME B 31.3 which
>mentions this?
>
>
>
>I heard it shall be 5t or min 300mm for the size of a pup piece. No
>where in the ASME B 31.3 I could see it mentioned. Correct me if I'm
>wrong.
>
>
>
>Thank you,
>
>
>
>Regards,
>
>
>
>
>
>Sabir
>
>
>
>On Tue, Feb 10, 2009 at 11:28 AM, nilesh
>wrote:
>
>Dear Javed,
>
>
>
>   As per ASME 31.3 it should be 150mm
>
> Nilesh Parsekar,
>
> QC CO-ORDINATOR
>
>(Dp Mech,API 510,API 570,AWS-CWI,NDT LEVEL2)
>
> Belleli Energy
>
> QATAR
>
>
>
>--- On Tue, 2/10/09, Mohammad Javeed wrote:
>
>From: Mohammad Javeed
>Subject: [MW:1534] minimum length
>To: materials-welding@googlegroups.com
>Date: Tuesday, February 10, 2009, 1:09 AM
>
>
>
>dear all, have a nice day
>
>can any one tell me what is a  minimum length between two butt joints.(
>piece of pipe) with reference
>
>thanks with regards
>
>m javed
>
>
>
>
>
>
>
>
>>
>


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