In a centrifugal pump, priming is necessary mainly to:
Correct answer: D. Remove air from the casing and suction pipe
- A. Increase the atmospheric pressure at suction
- B. Increase the motor speed before starting
- C. Reduce water temperature in the casing
- D. Remove air from the casing and suction pipe
Explanation
Priming fills the pump casing and suction line with liquid and removes trapped air before operation. A centrifugal pump generally cannot develop the required suction lift when its casing contains air.
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About Hydraulics and Water Resources
Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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