Nozzle load effect on foundation & anchor bolts in PV elite

[Shokran]

Hi everyybody

I have a question regarding the calculation and effect of the nozzle piping load on vessel support, foundation and anchor bolt design specially on vertical vessel.
What is the common practice for large nozzle size 24" and 36" when the vessel weight is not high comparing to the nozzle load.

1- shall we consider separate load/moment in PV elite for each nozzle through "force/moment dialog" tab.
2- considering that, I will have 20 Number of M48 anchor bolts which seems too overdesign for a 8 ton vessel while without considering the load I will have 16 x M30.
3- Piping load is not final yet and I am using a standard SHELL DEP table, therefore I am not able to analyze which loads are canceled by each other.

Vessel size Dia x Tl/Tl: 2 x 5.1 m
Nozzle size: 24" and 36"
Vessel dead weight ~ 9 ton

 

[TGS4]

First, you need to ask yourself, what is the probability that the loads will cancel each other out? Then, what is the probability that they will act in the same direction and be additive? And remind yourself of Murphy's Law.

Forget what your software is doing. What do you think, as an engineer, is the correct/appropriate way to do the calculations?

 

[TomBarsh]

I suppose, too, that in the big scheme of things a smaller vessel might actually be supported by all the piping hanging off of it. Hard to quantify that though.

 

[84Volumex]

Some food for thought from AS 1210-2010 Appendix N.

The specified direction and maximum size of local loads for localized nozzle stress
calculations might not be credible when combined with all other maximum nozzle loads for
the design of the total resultant piping load acting on vessel supports. Engineering studies or a
detailed assessment of piping loads, directions and load cases can provide a more credible
total resultant piping load. In the absence of such assessments or of any specified design
loads, the supports should be designed for a minimum of 50% of the most conservative
addition of all credible piping loads as applied to the vessel supports.