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[MW:13726] dished head shape for 2: 1 elleptical dished head

By Materials & Welding
Dear All,
 
Greetings.
 
A dished head of  ID 1520 mm & thk 80 mm hot formed by subcotractor. A vessel is being manufactured by ASME SEC VIII DIV1.
as per the forming report  dished head is having Overcrowning of 10 mm & SF is 70 mm.
 
 Now vessel manufacturer  is claming that Dished is having 10 mm plus side SF( 80 mm). manufacturer wants to shift tan line by 10 mm to maintain overall lenght.
 
my question is --
 
1)  is it mandatory that for  for a dished having overcrowing,  SF  will also be more than required.
 
2) what is the effect on Knuckle radius if the SF is shifted by 10mm.( considering the fact that contractor  has  done forming of the dished head considering 70 mm SF).
 
3) can we accept the dished head if  dished head forming contactor certify that even with 80MM SF the true shape of  the dished head will be satisfactory.
 
can we accept the dished head if  true shape of the  dished head  is checked by a template( 2: 1 elleptical type) which is having 80mm SF & it is showing satisfactory result.
 
Please advice.
 
Thanks & Regards
 
Asad Azmi
 
 

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