What are the reasons for insufficient pumping volume?
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Yesterday, during the second oil pressure test, pump B was kept running with a pressure of 0.4 Mpa. The rear impeller can be removed without any problems. The pressure of pump A is around 1.2. So please, experts, advise me – what are the reasons why the pump cannot deliver fluid?
The inlet filter has been cleaned, but the pressure is still 0.4
One pump in operation and one as backup? Is it a centrifugal pump? Do you want information on impeller wear?
It is a centrifugal oil pump with one in operation and one as backup; there is no issue with the impeller.
The pumps are turned on in the same way, but the pressures differ. Possible reasons include blockages at the inlet or faults within the pumps themselves; it’s difficult to determine this without being on site. It is recommended to operate the two pumps separately and monitor the outlet pressure, while also checking whether the inlet and outlet pipes or valves are fully open and free of any blockages； It seems the impeller is fine; the pump should not be having any problems (as long as the current level is normal)
First, check whether the current of the electric pump meets the standard. If the ammeter shows normal readings, then check the issue with the pressure gauge readings. If it is not one of the above situations, then it is necessary to check: first, is there a blockage in imports? (Including issues with the filter and whether there are problems with the inlet valve.) Second, it is necessary to check the patency of the outlet pipe (including issues with the outlet valve and the check valve). Third, check whether the mechanical seal is leaking. Fourth, check the size of the clearance between the secondary blades of the impeller.
Is there any possibility of a reversal? ? ?
Is there a problem with the pressure gauge? There is one in use and one as a backup; surely there is a valve to control it, so is there a problem with that valve?
No, this pump has been in use the whole time; it only stopped working after the pump was switched off once