Pipe Alignment tolerances as per ASME B31.3

[Biplab Pal]

Dear Experts,

 

We are going to erect the pipe in the pipe rack. The construction is erecting pipe, doing fit-up, and welding. But pipe line in the rack is not straight. they are going the way like snake. Our consturction code is ASME B31.3 process piping. I wanted to know what is the acceptance criteria for the straightness if the line pipe.

Please provide the reference.

--

Thanks & Regards
Biplab Pal
Welding Inspector

E-mail:   bipla...@gmail.com
 
Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. Myself accepts no liability for any damage caused by any virus transmitted by this email.
 

[Raghuram Bathula]

Tolerances are generally given in the contract documents or one can refer to  PFI standards ES02 and ES03. 

B31.3 doesn't give tolerances, however Any distortion of piping to bring it into alignment for joint assembly which introduces a detrimental strain in equipment or piping components is prohibited (refer para 335).

All piping erection shall be examined to verify dimensions and alignment. Supports, guides, and points of cold spring shall be checked to ensure that movement of the piping under all conditions of start up, operation, and shutdown will be accommodated without undue binding or unanticipated constraint.

[alam]

Hi,

As per knowledge no need to follow the ASME B31.3 IN this case, check and confirm the fit-up in line if fabricated in shop or in field.

Second monitor the joint weld after and during the welding process of two pipes or spools .

Third one , check the straightness of pipe before welding.(solution make straight)

fourth one , check structure alignment is correct or not.(if concrete beam advised to make level )

finally try to put seam to maintain the level .

But After reading your question i am on conclusion that check support weld and welding process .

Thank you.

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--

With kinds Regards

*********************

PRAVEZ ALAM

MATERIAL/PIPING INSPECTOR

SK E &C

Ruwais Refinery Expansion Project, 

P O Box : 11780, Ruwais,  Abudhabi.

United Arab Emirates.

Mob-+971509867435

E-mail-sk...@partner.sk.com

            alamp...@gmail.com

"When I am working on a problem I never think about beauty. I only think about how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong."

[sachin sankhe]

More clarity is required 

Is this mis-allignment at weld joint(pipe to pipe)?

If not above then as per your below mail "pipe line in the rack is not straight. they are going the way like snake"which is possible only when we make use of pipe fittings .Your process team would have already accounted for process parameter like pressure drop due to frictional losses and hence you need not worry for straightness of pipe

Regards

Sachin.Sankhe

From: Biplab Pal <bipla...@googlemail.com>
Sent: Mon, 24 Sep 2012 21:33:06
To: materials-welding <material...@googlegroups.com>
Subject: [MW:15360] Pipe Alignment tolerances as per ASME B31.3

Dear Experts,

 

We are going to erect the pipe in the pipe rack. The construction is erecting pipe, doing fit-up, and welding. But pipe line in the rack is not straight. they are going the way like snake. Our consturction code is ASME B31.3 process piping. I wanted to know what is the acceptance criteria for the straightness if the line pipe.

Please provide the reference.

--

Thanks & Regards
Biplab Pal
Welding Inspector

E-mail:   bipla...@gmail.com
 
Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. Myself accepts no liability for any damage caused by any virus transmitted by this email.
 

--
To post to this group, send email to material...@googlegroups.com
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For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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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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