Re: [MW:15236] ASME Sec VIII Div.1 UCS-79 clarification

Hi

 

If EFE is less than 5%, SR is not required.

 

EFE  can lies between 5 to 40%, still SR is not required if none of following condition exists. Cold formed dish head  Will need SR even if one of following condition is satisfied when EFE is between 5 to 40%.

 

1) Vessel contains lethal substance

2) Material requires impact testing by either ASME VIII div 1 rules or material specification.

3) Thickness exceeds 16 mm

4) Actual thikness reduction after cold forming exeeds 10%

5) cold forming temperature between 120 to 480 degree C

 

Thanks

 

Murugesan

 

On Thu, Sep 6, 2012 at 1:14 AM, prem nautiyal <prem_nautiyal26@yahoo.com> wrote:

Hi friends   A vessel is being fabricated as per ASME Sec VIII Div.1. MOC is SA 516 Gr.70 The 2:1 ellipsoidal Dish end nominal thickness is 16mm / min thk 14mm. There is no PWHT and Impact test requirements in the vessel. I would like to know whether this 16mm thk dishend requires stress relieving or not as per UCS-79. Vendor has offered dish ends without SR. Is it acceptable? Nothing is mentioned in client specs and drawing about D/E SR.   Regards   Prem Nautiyal

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