[MW:3085] Re: Distortion limit for ASME Section 8 Vessels

You can go upto 20mm( 1%) for the difference between minimum dia and maximum dia you measure.

Regarding 0.5 mm localised metal loss, you can exercise engineering judgement. You can apply Uw 35 tolerance on undercut ( 1mm )for this or UG 16 plate undertolerance of 0.25 mm.

arun

On Sat, Aug 29, 2009 at 11:22 PM, prabhakar s <prabhakars84@gmail.com> wrote:

Hi,

Thanks for your valuable information. I have got the clause. It is UG-80 Out of Roundness Tolerance. As per the June 2008 interpretation this clause is applicable for Weld distortion (Vertical Peaking) also.

Regards

Prabhakar. S

On Sat, Aug 29, 2009 at 5:13 AM, vipin george <vipingeorges@gmail.com> wrote:

Hi!Prabhakar,
Please refer ASME Sec Viii Div1 ,Edition 2007 Addenda 2008, uw-31 & uw-33 for tolerances.

Thanks& Regards,
Vipin

On Fri, Aug 28, 2009 at 11:12 AM, prabhakar s <prabhakars84@gmail.com> wrote:

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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