| Biplab,
The thread/post is about API 5L. See the table J.4; foot note b
--- On Tue, 30/10/12, Biplab Pal <biplab.mech@googlemail.com> wrote:
From: Biplab Pal <biplab.mech@googlemail.com>
Subject: Re: [MW:15814] PIPE- THICKNESS VARIATIONS
To: materials-welding@googlegroups.com
Date: Tuesday, 30 October, 2012, 12:51 PM
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 | 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
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. --
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Thanks & Regards
Biplab Pal
Welding Inspector E-mail: biplab.mech@gmail.com
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