Stress analysis of GRE pipeline directly laid on the ground

[PIPING_DESIGNER]

I have to make the stress analysis study of a pipeline that is not buried but it is directly laid on the ground.
how to model this pipeline on CAESAR II.

 

[1503-44]

Why model a pipe with no restraints. It will expand resulting in a maximum load of its friction force against the ground.

Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[akpipelineengr]

If it doesn't matter enough to put it on pipe supports, it probably doesn't need stress analysis.

It's not clear what kind of pipeline you are working on, but I've seen HDPE lines laid on the ground and allowed to freely expand/contract. Steel pipelines should probably be at least leveled above the ground with timbers or similar sleepers.

 

[0707]

A stress analysis should be ok but what do you meant by "directly placed on the ground?".

 

[RVAmeche]

No saddles or shoes? Just 100% pipe laying on the ground?

 

[LittleInch]

Does it have the option of simply continuously supported?

Or a buried pipeline with no depth of cover?

Or a lot of simple sliding supports every 0.1m?

How flat is the ground?

I've seen loads of these in the desert, but never seen why you need to analyse them - they just snake where they want to.

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

 

[KevinNZ]

How much thermal expansion do you have to deal with? Are thermal stress high? A line on the ground is not going follow the model and you will be pushing over stress somewhere. The expansion of high stressed lines needs to be controlled/guided/looped/anchored.

 

[LittleInch]

I missed that this was GRE (in the title)

DON'T DO IT.

GRE expands and contracts a lot. The big issue is that GRE is very susceptible to abrasion and after a year or two, you will have a pipeline full of holes. Plus the joints don't like being stressed or having bending moments.

This pipe needs to be on suppports and guided.

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