Gear pump pressure loss
Gear pump pressure loss
(OP)
The Gear pump supplies barrier fluid (Oil) to a set of pumps as a part of the plan54. The set pressure of the
gear pump is 1200 psi, and it has been found that the pump losses its pressure over a period of time ?
appreciate comments on the probable scenarios?
gear pump is 1200 psi, and it has been found that the pump losses its pressure over a period of time ?
appreciate comments on the probable scenarios?





RE: Gear pump pressure loss
If you build up pressure in the discharge, then stop rotating the shaft, the pressure will decay, as the pumped fluid leaks back through the tooth tip clearances and the gear face clearances. This typically happens in seconds, for small pumps and small rigid downstream chambers.
A WORN OUT gear pump will have considerably larger internal leakage, and will eventually be unable to supply any given demand downstream, so the pump would "lose its pressure", hopefully over a period of years when pumping oil.
There is not nearly enough data visible here to say for sure, but it may be time to rebuild or replace your pump. ... OR your relief valve or whatever is 'set' to control the pressure, may be drifting, or worn out. ... OR there is a leak that you don't know about yet.
Mike Halloran
Pembroke Pines, FL, USA
RE: Gear pump pressure loss
It runs fine and again the same phenomena happens?
RE: Gear pump pressure loss
Ted
RE: Gear pump pressure loss
RE: Gear pump pressure loss
Is it part of the pump, or part of some other component?
Is it a setting in a PLC's HMI?
A photograph would help. A P&ID might help more.
Thanks.
Mike Halloran
Pembroke Pines, FL, USA
RE: Gear pump pressure loss
It is set locally after starting the pump.
Thanks.
RE: Gear pump pressure loss
Ted
RE: Gear pump pressure loss
RE: Gear pump pressure loss
653jon, have you ensured there is not a leak elsewhere in your system?
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RE: Gear pump pressure loss
Does your relief valve adjustment stem / screw has a jam/lock nut to secure the stem?
Any vibration could cause the adjustment stem of the relief valve to come loose if there is no jam / lock nut and the setting will be affected.
RE: Gear pump pressure loss
currently,we are planning to inspect one of the gear pumps internals.
RE: Gear pump pressure loss
RE: Gear pump pressure loss
It's by no means a scientific approach, by it helps to diagnose a leaky system without stripping parts out.
Better still...run the return line into a bucket and monitor what comes out. You shouldn't see any oil at all. If you do, that is the problem.
Adrian
RE: Gear pump pressure loss
Ted