expansion joints
expansion joints
(OP)
hi all,
I am doing a stress analysis for pump suction piping. The pipe is connected directly to an expansion joint. Then there is an elbow next to the expansion joint. A support is installed at the piping right after the elbow. I would like add an directional anchor at the support to limit the lateral movement of the expansion joint. Is this a common pratice?
Thanks,
I am doing a stress analysis for pump suction piping. The pipe is connected directly to an expansion joint. Then there is an elbow next to the expansion joint. A support is installed at the piping right after the elbow. I would like add an directional anchor at the support to limit the lateral movement of the expansion joint. Is this a common pratice?
Thanks,





RE: expansion joints
The pressure and temperature involved would be usfull. The type of bellows is also necesary information, i.e. does it have tie rods? control rods, is it metal?, or is it rubber?
RE: expansion joints
Here is a sketch of it. The temperature is 100C. Pressure is 690kPa.
RE: expansion joints
I think you should:
a. remove the expansion joint
b. use a guide to restrict lateral movement in the approach pipe run but allow movement away from the pump.
Next time please include a North Arrow on your sketch
RE: expansion joints
Your layout shows a bellows directly atached to the pump suction coming in from a 90 deg elbow. This is bad practice due the flow disruption caused by bellows joints (as well as the elbow although some would argue this point). You are likely to see long term cavitaion and flow disruption problems.
Just my 2 cent's worth.
RE: expansion joints
RE: expansion joints
Ever so occasionally a pump will have a growth characteristic that requires an EJ to allow it to move, but not as an excuse for poor piping design.
rmw
RE: expansion joints
www.forengineers.org/wrc/wrcpvrcbulletin.htm