Most Severe case for Nozzle Load Directions

[Mohit_singh]

Hi all
I have to perform a Nozzle FEA and have been given the Piping Loads at the Nozzle Flange.
Fa(kgf) Fl(kgf) Fc(kgf) Mt(kgf.m) Ml(kgf.m) Mc(kgf.m)
750 1100 1000 1250 2100 750
Now I want to know that should be the directions I should consider to predict the most severe case to go for FEA.
Doing FEA for all possible combinations will be very Inefficient.

 

[chicopee]

I would say do resultant calculations of all the forces and moments in the X,Y and Z coordinate system at the nozzle; pay particular attention to the directions of the resultant values then apply the stress equations from those values.

 

[TGS4]

The directions are given in the load descriptions: axial (with respect to the nozzle), longitudinal (with respect to the vessel), and circumferential (with respect to the vessel). For plastic collapse, check both the positive and negative directions. For ratcheting, check a full nozzle load reversal.

If you have any doubts, ask the engineer that provided the loads to you.

 

[Mohit_singh]

@TGS4 Thanks for your response. Actually the piping engineer who gave me loads says to check all the components in all possible directions as he can't say with authority that only one particular case can be taken.

 

[TGS4]

Well then - that's not particularly helpful of that piping engineer.

 

[1gibson]

Looks like those are not "piping loads" (an actual loading scenario from a piping analysis) those are "allowable loads" and could be any combination in any direction (+/-)