Nozzle reinforcement Div 2 head Div 1 vessel 1

[HowJoh]

I'm designing a Div 1 vessel and for various reasons have had to design the heads per Div 2 under U-2(g) of Div. 1.

My question is: Are there any reasons why I'd not be able to use the Div 1 area replacement reinforcement calculations for nozzles in these heads?

Thanks,
HJ

 

[GenB]

more info is needed, se heads? flat? type of joint?

 

[prex]

Though I've never met such a situation, I can't see a reason why not.
You have determined a minimum required thickness for head with a (permitted) alternative method to UG-32, now, staying within your design code, you go to UG-37 with that minimum thickness and that's OK.

prex

http://www.xcalcs.com

: Online engineering calculations

http://www.megamag.it

: Magnetic brakes for fun rides

http://www.levitans.com

: Air bearing pads

 

[gr2vessels]

HowJoh,
If you design the head as per Div 2, then the opening in that head shall be designed for the rules you opted to use, ie as per the Div 2, Clause 4.5.10 or other method described in the Div 2. The reason for that is the stringent design and inspection requirements of the Div 2, which allows the building of a safe and economically feasible equipment. That is the reason for developing the Clause 4.5.10, instead of using the UG-37.
Try to imagine how safe would be an equipment built to 17 international codes, where you pick and choose the most convenient allowances.
However, I believe that you are asking a big question in a wrong place, this post of yours should be answered by your Client, the AI or the local authority.
Hope this helps and doesn't disappoints.
Cheers,
gr2vessels