Jacketed Piping Modelling

[nikolastrojman]

Hi,

I have a question concerning the definition of load cases in Caesar II when modelling Jacketed Piping. What load cases one has to define compared to ones you define when modelling normal pipe? Do you have to define separate load cases for the core pipe and for the jacket (for example one operating case for core W+T1+P1 and one for jacket W+T2+P2)?

Thanks in advance

 

[nikolastrojman]

Forget about the above question, it was a stupid one, I've come up with the rather obvious answer myself.

 

[DSB123]

17021984,
Remember to model the "spiders"(guides) between the inner and outer pipes as these affect the overall stiffness of the combined system as well as the displacements. I once had a stress engineer (with supposedly 10 years experience) not model these, ran the analysis and then said everything was OK. When I looked at the results the inner pipe displacements in the radial direction were greater than the outer pipe (i.e. the inner pipe was moving through the outer pipe) which was impossible but he said the results were near enough - not!!!!