Hello All,

For checking Tanks nozzle load, API 650 nomograms are based on FR,MC and ML load an moments. My question is that, is there anything that I should check the lateral load FL,Fc and rotational moment Mt against on nozzle? or whatever they are doesn't matter?

Thanks

The three terms that lack limits are your shear terms - torsion (Mt) and the two direct shear loads (Fl & Fc).
The connection is relatively strong in shear and will fail through bending. I guess this is why there is no check on shear.

Thanks David

Hello Dave, I have a doubt about tank nozzle loads, I'd greatly appreciate it if you could respond:
Is it applicable to use "Nozzle flex" and entering all displacements at nozzle/shell junction in CAESAR II, and then sending the restrain report at the junction to the tank vendor?
It should be mentioned that without considering flexibility at the junction(it means without clicking on "Nozzle Flex" box) the stress file is overstressed and nozzle loads are so huge, and if I send the values without considering flexibility at the junction the vendor definitely won't accept it.

NRAM,

You have a valid concern. My (personal) recommendation is that you always consider the flexibility of the terminal point (nozzle) assuming you can properly compute that/those value(s). As you noted, this will lower the loads at that specific restraint, and can influence the surrounding (associated) piping.

As to your specific situation - where did you obtain the displacements you want to enter? Was this was a manual computation (according to API-650)? If so, I suggest you specify those displacements on a CNODE connected with the API-650 flexibilities to the piping (nozzle) node. This is why on the API-650 nozzle dialog you have the field (edit box) to enter a CNODE.