Common Causes of Pump Failure

Most pump failures are not random — they are the predictable result of a handful of root causes. Recognising the symptoms early keeps small problems from becoming rebuilds.

1. Cavitation

A crackling, gravel-like noise and pitted impeller vanes mean the suction conditions are starving the pump. Check suction lift, line restrictions and fluid temperature against the pump's NPSH requirement.

2. Running off the curve

Operating far left or right of the best-efficiency point loads bearings and shafts beyond design. Throttled discharge valves, oversized pumps and changed system conditions are the usual suspects.

3. Dry running

Mechanical seals fail in seconds without liquid. Level controls, priming protection and operator training are cheaper than seal replacements.

4. Misalignment and vibration

Coupling misalignment, soft foot and unbalanced impellers show up as bearing failures months later. Laser alignment at installation and after any maintenance pays for itself.

5. Wrong material for the fluid

Abrasive solids, chlorides and aggressive chemistry attack standard materials. Match wetted materials to the actual fluid, not the clean-water assumption.

Prevention beats repair

A basic preventive routine — vibration checks, seal inspection, alignment verification and performance logging — catches most of these before failure. Our service team supports preventive maintenance and troubleshooting for the equipment we supply.