What do the common failures of single-stage centrifugal water pumps primarily include?

I. Insufficient Flow or No Liquid Discharge

Clogged impeller or inlet valve, worn wear rings, air leakage in the suction pipeline, pump not fully primed, reverse rotation of impeller, low liquid level in storage tank, etc.

II. Abnormal Operating Noises

Foreign objects entering the pump body, impeller rubbing or loosening, bearing damage, cavitation, etc.

III. Excessive Vibration

Misalignment of the coupling, excessive bearing clearance or damage, bent pump shaft, rotor imbalance, loose anchor bolts, air ingress, etc.

IV. Overheating Bearings

Poor lubrication (insufficient or degraded oil), inadequate cooling water, bearing damage, wear of the pump body bearing bore, excessively tight bearing cover, etc.

V. Seal Leakage

Worn sealing components, improper installation, damaged shaft sleeve, loose or damaged gland packing, etc.

VI. Cavitation Phenomenon

Insufficient inlet pressure, excessive liquid temperature, excessive suction lift, air bubbles entering the pump body, etc.

VII. Excessive Power Consumption

Overtightened gland packing, excessive axial movement of the pump shaft, centerline misalignment, parts jamming, etc.

These failures are often caused by improper installation, incorrect operation, or inadequate maintenance. Timely troubleshooting and targeted measures can effectively improve the pump’s operational efficiency and lifespan.