Pressure Vessel - Nozzle Loads

It depends if the nozzles are meant to support any weight, but it sounds like the saddles are doing this. It is hard to give you an answer without more detail -

Can you provide a sketch?

Dear XMech,

Thanks for ur answer. The upmost vessel size is 2.5M O.D. x 7.3M L. weighing 46 T at hydrotest, is supported on a bottom Vessel 4.3M O.D x 12M L. There are inerconnecting nozzles two of 14 in. and one of 26 in. size. I want to know if sagging of vessel will give a load on the nozzles or not.

Yes, there will be a load on the nozzles and they must be designed for (including the shells) in accordance with ASME VIII UG-22 LOADINGS:

(b) weight of the vessel and normal contents under operating or test conditions (this includes additional pressure due to static head of liquids);

But the nozzles do not necessarily need to be designed for the full weight, as the saddles will take up some - this may be determined by beam/structural analysis . You should also, as a minimum look to WRC 107 & 297.

Thanks a lot!