Caesar II case load 2

[amr12212]

Hello guys ,
My name is Amr and i am fresh mechanical engineer and i just started my work using CAESAR II , now i can do the 3D model very good and entering all data needed but i kindly weak in load case i really cant understand it clearly and the output report for the caesar II ,like for instance why sometimes we take the load from the wind but not from the dynamic load of the fluid (slug force) in static load case ??? please if someone can help me with this i will be much thankful .

sincerly,

 

[RVAmeche]

My best advice is to say you need to find someone who knows stress analysis to teach you. It's really not the same as CAD work where you can pick it up on your own and get it right.

If you don't get help from someone who knows what they're doing, you'll likely just be getting garbage in/garbage out of the software because you don't understand it. Once you get someone to explain it and help you, online videos/articles/forums will be more helpful because have a base understanding of what's happening.

If your company doesn't have someone more experienced that will be checking your analyses, honestly, your company shouldn't be doing stress analysis.

 

[LittleInch]

The definition of the load cases will be defined by the mechanical Engineer.

Different stress limits apply in the even that the load is a sustained one from normal operation or an occasional one like maybe slug forces.

It is also often defined in the design code used as to what cases are required.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Snickster]

Wind load is typically considered an equivalent distributed static load. I have modeled slug or water hammer as an equivalent static load applied to each elbow. Sometimes more than one load case is required if the elbows are close enough that the slug loads add to each other and put more load on pipe that actually occurring, such as ,making 3 separate runs with forces placed at every third elbow. Usually my final design includes anchor at center of each run so pipe can take slug force and also expand axially into elbows at each end.

 

[GD2]

amr12212,
Typically, a project 'Design Basis' or DBM well defines the loads to be considered and the limits.
One of the objectives of the piping stress analysis(which you are doing) is to calculate these loads and design the layout so that the system is built for structural integrity, operational integrity and optimal design.
To do this you need to build several load cases or load case combinations such as operating load case, sustained load case and occasional load case (as my colleagues had pointed out).
Once you know the loads and the load case combinations, you will exactly know which load case combinations will govern the design and make your all-in effort to qualify the design to keep the stresses within its allowable limits.
Sometimes, the load case combinations will be defined in the 'Design Basis'.
In your example, whereas the wind load is considered as a static load, the slug force is a dynamic load.
Caesar II can do a static analysis with the slug force with some assumptions.
I hope you know how to do the modelling with slug force.

GDD
Canada