1. Pump Fails to Discharge
Possible Causes: Insufficient priming water, incorrect rotation direction, impeller channel blockage.
Solutions: Refill the pump with water, clear the impeller passage, and correct the rotation direction.
2. Insufficient Flow
Possible Causes: Partial blockage of the heat insulation pump, low RPM, total head exceeds pump rating, impeller damage.
Solutions: Clean the pump and pipeline, replace the impeller, increase pump RPM, adjust the discharge valve.
3. Low Outlet Pressure
Possible Causes: Air in the liquid, low speed, impeller damage, discharge valve opened too wide.
Solutions: Remove air from the system, increase pump speed, replace the impeller, adjust discharge valve opening.
4. Excessive Power Consumption / Motor Overheating
Possible Causes: Mechanical issues such as too small running clearance, bent motor shaft, loose bolts; operating at a flow rate far below rated head.
Solutions: Inspect and adjust mechanical components, regulate the outlet valve so the pump operates near rated head and flow.
5. Vibration
Possible Causes: Poor piping support, partial impeller blockage causing imbalance, cavitation, or air in the liquid.
Solutions: Check and reinforce support structures, tighten bolts, clean the impeller, and eliminate entrained air.
6. Leakage
Possible Causes: Damaged mechanical seal or O-ring, leakage from the pump casing.
Solutions: Replace mechanical seal and O-ring, weld or repair the pump casing.
7. Bearing Overheating / Overload
Possible Causes: Lack of lubrication, pump overload.
Solutions: Add oil to the bearings, eliminate overload by addressing the causes mentioned in point 4.