Re: [MW:15814] PIPE- THICKNESS VARIATIONS

Dear Mr. Devang,

 

Can you please specify, where in piping code indicate that the thickness variation should be between + or - 12.5%

 

On Tue, Oct 30, 2012 at 11:48 AM, Devang Majithia <dmmajithia@gnfc.in> wrote:

Code is allowing variation of (+)12.5% or (-) 12.5% of specified thickness. Similar kind of issue had occurred with our company. Piping was manufactured as per API 5L Gr. B. After referring API 5L specification we came to know that code is allowing variation of 12.5% on lower and upper side. For other ASME manufactured pipe variation is identical.

Hope info will be helpful to u

 

Regards

Devang Majithia

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of GOPU NAIR
Sent: Sunday, October 21, 2012 4:26 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:15729] PIPE- THICKNESS VARIATIONS

 

Dear Mr. Kumar It is possible for either cold drawn or hot drawn pipe to have thickness variation due to process itself, hence the tolerance is stated in the Codes.  Unless your customer specification is very clearly stating  about the thickness requirement as 9.53 mm minimum, the pipes within Code tolerances can be accepted. If you so desire, please ask your design department to recalculate the minimum required thickness to support your decisition to accept the pipes. Regards Gopu --- On Sat, 20/10/12, Kumar kerala <sk7920541@gmail.com> wrote: From: Kumar kerala <sk7920541@gmail.com> Subject: [MW:15723] PIPE- THICKNESS VARIATIONS To: materials-welding@googlegroups.com Date: Saturday, 20 October, 2012, 2:48 PM   Dear members,   We have inspected some pipes (sizes from 12", 16" & 24" all schedule standard (9.53mm))....but it was observed that the thickness upon measurement is from 9.26mm to 9.3mm. the material is API-5L, Gr.B (PSL-1). eventhough the thicknesses are within the API- mill manufacturing tolerences, these are not matching with the Schedule required by drawings/client specifiactions. normally the physical thicknesses on pipe seen as more like 9.6, 9.7mm etc or even up to 10mm....but if it falls below the thickness written on the pipe itself, how could we assess this issue? opinions from all corners are appreciated. also, this may be very common issue with others, kindly share.   Thanks in advance   Kumar. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm   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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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail:   biplab.mech@gmail.com
 
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