pipe vibration in stainless steel pipe
pipe vibration in stainless steel pipe
(OP)
I have a pipe vibration issue. Each time the submersible pumps starts the stainless steel pipe vibrates. I have two static mixers, which I can not remove. They are required because we have found that although removing the mixers has more or less eliminated vibration, it has affected the chemical mixing efficiency dramatically. Therefore I need to eliminate the vibration using other methods. I thought of bolting the pipe supports to the pipe flanges, however, I was advise that that merely transfers the vibration elsewhere along the pipe.
I was even thinking of putting in flexible couplings, but once again this may reduce vibration but not eliminate.
Does anyone know how to eliminate pipe vibration on stain less steel pipes? The current pipe support are about 1.5 m appart.
Regards
AKE71
I was even thinking of putting in flexible couplings, but once again this may reduce vibration but not eliminate.
Does anyone know how to eliminate pipe vibration on stain less steel pipes? The current pipe support are about 1.5 m appart.
Regards
AKE71





RE: pipe vibration in stainless steel pipe
Cheers
Greg Locock
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RE: pipe vibration in stainless steel pipe
RE: pipe vibration in stainless steel pipe
Can you upload a photograph or sketch so we can understand a bit more your situation.
desertfox
RE: pipe vibration in stainless steel pipe
RE: pipe vibration in stainless steel pipe
RE: pipe vibration in stainless steel pipe
Are these pumps pumping from a float or level switch/sensor, and is slosh in the tank a possibility (enough for the pumps to suck air)? Air bubbles slugging their way thru static mixers will definitely cause some shaking.
How well are the mixing elements secured in the piping? Is the vibration a high freqency, maybe due to the elements twisting/flexing and banging on the pipe walls?
Or is it a lower frequency, with the whole string of pipe rattling and moving between mounts? This latter would point more towards surging/slugging and/or air aspiration from the pumps.
RE: pipe vibration in stainless steel pipe
This sounds like water hammering. When you start or stop a flow, I think the back pressure(?) or velocity head(?) or something like that continues after starting and stopping fluid in pipes. There is a device not sure what it is called, but it has a diaphragm that compensates for this and will stop the pipes from vibrating.
Sorry to be so vague, but I hope it helps
Tobalcane
"If you avoid failure, you also avoid success."
RE: pipe vibration in stainless steel pipe
If I am wrong about the location of the vibration or the conditions under which it exists, please correct me.
Johnny Pellin
RE: pipe vibration in stainless steel pipe
One pump on its own might be operating with enough flow in its own leg to clear the vapour. When operating together the flow may drop in each leg to a value that prevents the vapour being forced out.
I suspect you might need vent valves on both sides of each check valve.