nozzle loads

[amith014]

I am doing FEA of horizontal pressure vessel, i want to know where to apply nozzle loads,

Is is at the junction of shell and nozzle or
at the end of the nozzle flange

Thanks
sagar

 

[kalapani]

It depends on where the nozzle loads where calculated. If the loads were calculated at the flange then you build a model with the nozzle and apply the load at the flange.

 

[Crompto29]

Apply loads so that they reflect the actual system.

 

[EngAddict]

It is generally at the junction of the shell and nozzle but they should provide a diagram. If there is no diagram it is generally assumed to be this case, but you may want to check with your client.

 

[gr2vessels]

Refer to WRC 107 for definition, location and orientation of loads.
cheers,
gr2vessels

 

[SDRME]

It depends on where they act. If you are going to use WRC 107 or 297 methods in order to find the final stresses, you should transfer the loads/moments to the shell and head junction. But, If you are going to use FEA based on asme div 2 part 5 (2007 edition), as seems it is the case, the load action point is where they act and can be everywhere.
Hope it helps.

 

[LSThill]

amith014 (Mechanical)

Question??

Why not using

http://paulin.com/NozzlePRO.aspx

or FE107 FE107 is written by Vessel Engineers for Vessel Engineers

http://paulin.com/FE107.aspx

 

[roca]

or why not do it by hand first and learn..............

 

[EngAddict]

Why pay for NozzlePro when you already have an FEA package? Use WRC 107 and/or 297 first, or even better use PD5500 Annex G, and if they still indicate failure then run it through FEA.

..or like roca said calculate and transpose the stiffness matrix by hand, should only take maybe 3 months.

 

[LSThill]

The following list summarizes areas where WRC 107 and WRC 297 are considered weak, or where there is cause for concern.

•d/D > 0.5
•t/T > 1.0
•Pad reinforced nozzles
•Hillsides or laterals
•Area replacement rules for pressure are barely satisfied and large diameter divided by thickness ration (D/T).
•Temperatures are approaching the creep regime.
•Cycles are greater than 5000.
•Design and operating conditions are approximately the same.
•The load consists of high-pressure stresses and high loads.
•The Piping attached to the nozzle is long, flexible, and somewhat unrestrained.

L S THILL