hi friends

please clarify my following doubts

i have got a system with temp 550deg and pipe dia is 1" &1.5" aftr running the analysis i noticed that in hanger table 6 out of 10 being designed as constent spring,is ther any specific reason this to be happended for small bore pipe?
2)how can we change this constent spring to variable spring
3)how can we differentiate long range spring and short range spring
4)what are all factors we need to check for spring support selection
THANKS

Dear Arun

selection of variable spring & constant spring depends on thermal vertical movement on that location not on load/diameter of pipe.

You may manually try to adjust it with user define spring.
Short range spring have high stiffness value & is applicable for small vertical movement.
Long range spring have low stiffness value & is applicable for large vertical movement.

In general most hard spring will be prefer choice then can gradually go down softer spring as suitable.

Regards

Habib

Thanks Mr habib

but in my case ..im not having much experiance in stress but i have found 10-15 system of large bore ther i could not find even one constant spring. but in small bore story is different ther lot of constant spring in picture


what u mean by hard spring? can u please elaborate it?

Without weight and if allowed to move freely, some very flexible systems will bow a great ammount in the vertical direction. If you allow CAESAR II to size springs all along these runs, you may see several contants selected. I am not saying this is your situation, but, if it is, try throwing in a rigid vertical support in the middle of these runs. You should see little thermal load on that rigid support and that may "calm down" your system.