Dear Limesh and Ahamed,
Even the specification says
Radiography of the butt welds is required for situations in which the minimum separation is not achieved.
So I think there are not big concerns for the issue, even concession request is not requiered and may this clause to be mentioned in procedure ot Method of statement.
Regards,
Arun S Das
From: limesh M <limesh78@gmail.com>
To: materials-welding@googlegroups.com
Sent: Tue, 26 October, 2010 9:43:47 AM
Subject: Re: [MW:7807] Separation of joint
Mr. Ahmed,
As far as I am concerned ,the longitudinal seam of the two pipes are coming in a straight line in radial direction,if the fit up has given exactly each other.If any mismatch comes both are parallel when we are extending(imaginary) their horizontal axis.However better consult with operating company/PMC engineering wing for a better clarification.I am attaching proximity of weld taken from BP coryton engineering standard for your reference.
Dear Arun S. Das,
Hot tap split tee end welds which cross the pipe longitudinal seam are exempt. I just highlited this sentence for further clarification only.Hot tap split tee welding and normal pipe to pipe fit up has no relation.
Regards,
Limesh
On Mon, Oct 25, 2010 at 3:36 PM, Ahmed Husain <ahmraha@yahoo.com> wrote:
Mr. Limesh,Thank you very much for your prompt reply. I had referred that paragraph. But it was to not clear to me if same para can be applied in present situation where longitudinal seams of two fusion welded pipe are at same plane at circumferential joint. There is no separation between.So as per your interpretation, same paragraph is applicable. Correct me if I am wrong.Ahmed Husain
Mob-0547170325
From: limesh M <limesh78@gmail.com>
To: materials-welding@googlegroups.com
Sent: Mon, October 25, 2010 6:47:27 AM
Subject: Re: [MW:7770] Separation of joint
--Dear Mr.Ahmed,
As per Saudi Aramco Engineering Standard (SAES-W-011 Welding requirement for onplot piping) the following clauses are applicable.There is no such kind of criteria in ASME B31.3.
11.16 Weld encroachment and minimum distance between welds.
The requirements for minimum separation between adjacent welds are listed in 11.16.1 and 11.16.2. The distances shall be measured between the edges of the adjacent cap passes. These restrictions do not apply if one of the welds has been postweld heat treated prior to making the second weld or both welds have been postweld heat treated and inspected.
11.16.1 The minimum distance between parallel butt welds shall be 20 mm or three times the wall thickness of the joint, whichever is greater.
11.16.2 Pressure containing welds (structural components and reinforcing pads are exempt) shall be separated from other pressure containing welds by no less than 20 mm or three times the joint thickness, whichever is greater. This requirement is intended specifically for nozzles and other attachments that are added onto or adjacent to an existing butt joint. Hot tap split tee end welds which cross the pipe longitudinal seam are exempt. Radiography of the butt welds is required for situations in which the minimum separation is not achieved. For joints other than butt welds, other appropriate inspection methods shall be used, depending on the geometry and material.
Regards,
Limesh
On Sun, Oct 24, 2010 at 3:10 PM, Ahmed Husain <ahmraha@yahoo.com> wrote:
--Dear All,During fit-up of two spools of SS304, It was observed that logitudinal seams of pipe are coming face to face, means there is no separation between long seams of large dia pipe. Is there any criteria stated in asme B31.3 or Aramco standard in this regard.Regards,Ahmed H.
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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