Quolifying thickness reducetion for forming head of pressure vessel in fabrication

[mechengineer]

Hi QC experts,
I have a vendor, the nominal dished head thickness is 14 mm, after forming 7 mm, the stress calculation thickness required is 6 mm. It is ok in deign/stress calculation. But I don't believe it is a good/qualified product with reduced a half of the nominal thickness after forming, some where thickness reduced from 14 mm to 7 mm. Any regulations from code, user's specifications and fabrication experience for qualifying the forming head thickness reduction?
Thanks

 

[SWComposites]

Depends on the required pressure. Someone needs to do a stress analysis using the actual thicknesses.

 

[david339933]

You don't give a lot of info, but I would check out UCS-79 (d)(2)(d)