Friday, August 28, 2009

[MW:3058] Re: Distortion limit for ASME Section 8 Vessels

Dear Mr. Prabhakar
 
Since you have not mentioned any code of Design/construction, I assume that the tank is just a storage tank.  Distortion of about 3mm at the weld joint will not make any diffenrence functionally.  Extent of distortion depends upon the length and diameter of the shell and how it looks visually.  To ascertain whether 0.5 mm local ground spot is acceptable, please carry out the measurement of actual thickness using thickness meter (UT based) or calculate the theorical requirement.  If local dent looks too bad meerge the same in a larger area to look better.
 
 
 
Gopal
 
 --- On Fri, 28/8/09, prabhakar s <prabhakars84@gmail.com> wrote:

From: prabhakar s <prabhakars84@gmail.com>
Subject: [MW:3052] Distortion limit for ASME Section 8 Vessels
To: materials-welding@googlegroups.com
Date: Friday, 28 August, 2009, 12:42 PM

Hi,

 

 

We have procured a Stainless Steel tank from one of our sub contrators. The thickness of the plate is 6mm. They have done hydrotest also. The tank is shifted to our Project site from the Sub contractors yard. We observed a distortion of 3mm near a Longitudinal seam (Both side of the weld seam).

 

I would like to know the allowable tolerance limit for distortion. Is 3mm acceptable? If it is so please give me the code reference.

 

We observed  a Grinding mark of 0.5 mm depth on 6mm thick Shell. what is the allowable limit for this? Is there any code reference?

 

Your early response in this regard will be highly appreciated.

 

 

Regards

Prabhakar. S

 

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