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Commentator

Join Date: Apr 2009
Posts: 68

ASME Fabrication Tolerance

02/27/2012 9:42 AM

Need to know what are the mandatory fabrication tolerances required for static equipment designed as per rules of ASME Section VIII Dev 1 Tolerances for allowable variation in nozzle location, nozzle projection, orientation, welds, supports location, support orientation, overall height or length of equipment etc.

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#1

Re: ASME -Fabrication Tolerance

02/27/2012 9:46 AM

ASME Specifications

This is getting lots of use today.

If you are building equipment to the requirements of ASME specifications you really should have these specifications at hand.

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Guru

Join Date: Nov 2007
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#6
In reply to #1

Re: ASME -Fabrication Tolerance

02/28/2012 9:03 AM

Yea it's bad when you have to tell a vendor or fabricator which nozzles require repads.

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Guru

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#2

Re: ASME Fabrication Tolerance

02/27/2012 1:07 PM

As lyn stated, you need to have the current ASME Codes if you are buying or selling pressure vessels.

A lot of the code has changed since I was involved with vessels, but back then about the only fabrication tolerances covered by code were in ¶UG-80 and UG-81. Plus material thickness tolerance, etc. covered by the material specs. Other tolerances were subject to agreement between buyer and fabricator via specification and common practice. Pressure Vessel Handbook by Megyesy is a good reference, but it isn't cheap and it doesn't replace having the Code itself. My 1992 edition has a tolerance on projection of manways and nozzles not connected to pipe of 1/2" and on piping nozzles of 1/4".

Are you buying or selling?

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Commentator

Join Date: Apr 2009
Posts: 68
#3
In reply to #2

Re: ASME Fabrication Tolerance

02/27/2012 2:04 PM

As I just found only UG 80 & UG 81, and material thickness tolerance. I was confused about other tolerances. Thanks for your guidense.

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Power-User

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#4
In reply to #2

Re: ASME Fabrication Tolerance

02/27/2012 3:15 PM

I concur with the comments of Bigg...

Although ASME VIII Section UG contains some guideance, most competent engineering firms specify required fabrication tolereances in contract documents. Fabrication shops may or may not be able to meet these requirements, but this must be discussed at time of purchase.

The Megussy book is a good place to start, but the tolerances contained in this book are not part of any code or standard.

Every real engineering company should develop thier own fabrication requirements for pressure vessels, heat exchangers and storage tanks. The tolerances should be attached to contract documents as well as piping fabrication/installation contracts.

My opinion only....

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#5

Re: ASME Fabrication Tolerance

02/28/2012 3:08 AM

Good. Also check MSS SP 97 2006. WP

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#7

Re: ASME Fabrication Tolerance

02/28/2012 2:42 PM

Free download the required file for Tolerances used in design and fabrication of ASME code items.

....................................................

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Commentator

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#8
In reply to #7

Re: ASME Fabrication Tolerance

03/01/2012 3:20 AM

Thank You Sir.

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#9
In reply to #7

Re: ASME Fabrication Tolerance

04/23/2012 9:25 AM

I do not know why this is off topic.

GA

Oh, I see, the file link is invalid

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#10
In reply to #7

Re: ASME Fabrication Tolerance

01/08/2013 2:39 PM

Abdel: I'm unable to open the hyperlink. Could you please send me a correct link to this tolerance standard of yours? Thanks

Jey

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Users who posted comments:

Abdel Halim Galala (1); bigg (1); cingold (1); lyn (1); MJCronin (1); nbhide108 (2); phoenix911 (1); srijey (1); Whitephone (1)

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