What it means
Most water systems use centrifugal pumps for moving large volumes. Positive displacement pumps are common for chemical feed or precise dosing. Operators need to understand pump starts, stops, flow, pressure, cavitation, vibration, and basic operating limits.
What operators watch
- Centrifugal pump flow changes with system head.
- Running pumps outside their normal range can cause damage or inefficiency.
- Check valves, isolation valves, and controls affect pump operation.
Common exam traps
- Mixing up centrifugal and positive displacement pump uses.
- Ignoring suction conditions and cavitation.
- Assuming a pump problem is always electrical rather than hydraulic or mechanical.
Field example
A booster pump that becomes noisy and loses flow may be experiencing cavitation, air entrainment, or a suction-side restriction.
