As per ASME sec VIII-Div-1 Flange Regidity is Mandatory ,except if citing code case 2547.
Anybody can help me for understanding Code Case-2547.

What is it for?
If Customer dose not specify anything can we use above code case?
Thanks In advance
l

As written in the Code Case it´s allowed to use alternatives for the design of the flange rigidity:

However, it does not mean you are allowed to do what you want if your customer doesn´t specify it clearly. I advice to ask everybody involved if there are any objections prior to the use of a Code Case. Otherwise you are running into troubles.

Imagine you are using a Code Case and/or the customer/user/legislation at the place of erection are not on your side. You should consider this before the use of any Code Case!

Michael

The intention of 2-14 is to ensure stiffness of the flange ring. Ie sometimes they leaked between bolts, probably because Appendix2 calculations were found not exact enogh.
The intention of CC2547 is that you don't have to follow 2-14, for instance when you use some PV calculation software which doesn't make this calculation- but you have to prove stiffness of your flange anyway.
Probably someone influential found his design not meeting 2-14. I wonder who that might be

According to our experience before the rigidity calculations, an optional flange calculated as integral flange could become thinner than calculated as a loose flange. This is absurd, and the phenomenon vanished with the new 2-14 rules.

However, in many cases the flange calculations do not meet 2-14. In these cases the Code Case can be a helpful tool to accept the flange "as is", rather than replacing.

DK

Thanks Frohnert ,
Yes i ve to design as per App 2-14 only and
as Dr K's Guidance


Our flange is 4-5 mm thick then optional flange claculations.

Thanks for advise Akonrad