hydrostatic pressure increase
hydrostatic pressure increase
(OP)
I want to calculate the pressure rise in a closed liquid full system when the temperature rises. Does anyone know where I can find this at. I have found the thermal relief equations that tell me the volume of material displaced but I want to know the resulting pressure if I did not relieve the system.
Thanks
Thanks





RE: hydrostatic pressure increase
Not to relieve the system is not a sensible approach. Most of the time the pressure will rise and over stress the piping system.
Calculate the change in liquid volume.
Calculate the change in pipe vomume.
Subtract the two. This will give you the net volume change.
Assume that the pipe will elongate enough to accomodate the net change in volume.
Calculate the necessary stress to produce this elogation.
The need for a relief device will be come evident.
IF you do not want a relief device put a expansion joint in a dead end branch (the expansion joint should be tied) the movement of the joint will accomodate the expansion of the liquid. The tie bolts will keep the joint from over expanding.
RE: hydrostatic pressure increase
Thanks
RE: hydrostatic pressure increase
Some companies allow you to take 'credit' for the fact that typical block valves, unless they are actually bubble tight, will pass enough liquid (and it doesn't take much as you know from sizing thermal relief valves) to avoid having a problem.
RE: hydrostatic pressure increase
RE: hydrostatic pressure increase