Extent of UG-44(b) to ASME I equipment

[CrisDom]

I'm designing a vessel according to ASME I and I'm wondering whether it's advisable/mandatory to check ASME B16.5 rating against external loads.
To be on the safe side, I decided to perform this check, considering also the statement in PG-22.1:

Stresses due to hydrostatic head shall be
taken into account in determining the minimum thickness
required unless noted otherwise. This Section does not
fully address additional loadings other than those from
working pressure or static head. Consideration shall be
given to such additional loadings.

Since this check involve the need to increase the flange rating, my client is asking me if this check for a vessel designed according to ASME I is mandatory.
I told them to refer to their Authorized Inspector (I'm still waiting for his reply), but I was wondering whether some instruction or statement can be found inside the Code, to have a certain support to my conservative approach.

Thanks to all.

Cristiana

 

[TGS4]

I would NOT advise using the calculations in UG-44(b). I would, however, point you in the direction of Code Case 2901-1. The Fm factors in the revised code case are much more accurate.

To directly answer your question, though, such a check is not necessarily mandatory according to Section I.