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Metering Pump Fault Diagnosis

Below is a guide given on metering pump fault diagnosis:

Problem

Possible Cause

Remedy

Inconsistent Dosing

Clogged Suction Filters

Clean Filters, and change filters were required

Diaphragm Rupture / Breaking

Check chemical compatibility. Examine service history to check service life is as expected. Check pressure pump is experiencing as a system could be over pressurized, or blockage in pump

Blocked inlet/outlet valve

Clean valves and examine cause of the blockage. If continues move to a pump design without valves or incorporate flushing regime.

Incorrect setup

Ensure diaphragm metering pump has been installed with a strainer, loading   valve on outlet, pressure relief valve and non-return valve on pipework connection

Inconsistent flow

If flow varies wildly and the metering pump does not match the requirements of the flow the pump will struggle to keep up. Ensure transfer rate and   metering pump are matched

Electric Motor not operational

No Power

Check electrical motor

Motor Overloaded

Check absorbed power of the pump

Zero Flow

Inlet / Outlet Valves Blocked

Clean valves and examine the cause of the blockage. If continues move to a pump design without valves or incorporate flushing regime.

Adjustment Flow set at 0%

Check set up of the pump

Leakage

Diaphragm Rupture

Check chemical compatibility. Examine service history to check service life is as expected. Check pressure pump is experiencing as the system could be over pressurized, or blockage in pump

Seal Failure

Examine O Rings to determine the cause of failure. Check and replace.   Monitor closely.

Excess Pressure

Monitor pump and system pressure. Check suction and discharge lines for blockages.

 

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