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Connect the models between them on each .C2 file

Connect the models between them on each .C2 file

Connect the models between them on each .C2 file

(OP)
Hi.

I’m working on a pipeline line of 158 km…I need to cut the line in 10 km pieces, because CAESAR doesn’t run with more of 32000 nodes.
The thing is, How can I connect the models between them on each .C2 file?
Is it correct if I try to put anchors at the extreme of each model? Because if I use the displacement option on the buried pipeline, CAESAR doesn’t run (Error 57E).

Thank you for your attention.

RE: Connect the models between them on each .C2 file

No need to model straight runs of underground piping in Caesar. Check only the last 500 meters at each end of the pipeline and at any transition points and changes in direction, wall thickness, vertical sag or overbends and changes in planar direction.
Running Caesar end to end ... :-)

I hate Windowz 8!!!!

RE: Connect the models between them on each .C2 file

(OP)
Ok, thank you.
But, could you please explain me why should I model only the last 500 meters at each end of the pipeline and not all the pipeline?
Thank you.

RE: Connect the models between them on each .C2 file

BigInch,
You say only check out the last 500m at each end of the pipeline. It depends where the "virtual anchor" is located which depends on the soil properties etc etc. surely!!!!

RE: Connect the models between them on each .C2 file

While theoretically possible, it would be more than extremely unusual in the real world to need a virtual anchor length greater than 300 m. We need to use realistic soil models and "ditch" these hydrostatic equivalents. Find a better model for axial friction. See US Army COE Technical Manual TM 1110, or any other model that accounts for shear stress compression and grain "lock up" of soils. It's much more complicated than F = f x den x depth. Use a model for soil friction based on that equivalent hydrostatic friction force and you deserve to have your paycheque reduced to pay for the 500 Ton anchor blocks that can result.

I hate Windowz 8!!!!

RE: Connect the models between them on each .C2 file

Yes that is THE precise anchor block that I had in mind. Saudi Aramco basically requires that their anchor blocks do not move at all. Zero movement. They have recently allowed the introduction of drag anchor blocks in some cases, which do allow some movement, less than 1" or so, but that is enough to reduce the size of most anchor blocks considerably. That was after they noticed that anchor blocks that were designed in the 80's (using reasonable soil values probably determined by COE methods, ie NOT using Caesar, etc.) were about 1/2 the size of anchor blocks that the engineers were giving them lately. Their specs also require anchor blocks between pipelines and pump stations and refineries. One day they'll learn enough to rewrite their specs to allow the flexibility engineer to decide if an anchor block is needed nor not and when that happens (if ever, I've been fighting with them for 20 years about it) they will be able to eliminate 95% of all anchor blocks. I believe it is because their first specs were written by plant pipers not sufficiently trained in soil mechanics and the myth just won't die.

I hate Windowz 8!!!!

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