17 Questions
What does priming a centrifugal pump involve?
Filling the pump casing and suction line with the liquid being pumped
Why is it important to prime a centrifugal pump before starting?
To prevent the impeller from churning air instead of producing suction
What is the purpose of the foot valve in the pump suction line?
To allow water to enter the suction line and prevent it from flowing back out
What should be done to prime a centrifugal pump when it is located below the source of supply?
Close the discharge valve, open the suction valve, and then open the air vent valves to allow air in the pump casing to escape
What happens if a centrifugal pump is not primed before starting?
The impeller will churn air instead of producing suction
What is the role of external supply valve when priming a centrifugal pump from an external source?
To provide priming water for the pump
Why are air vent valves opened when priming a centrifugal pump?
To allow the air in the pump casing to escape
What type of check valve is used in the pump suction line?
Flap type check valve
What happens when water flows from the air vent valves during priming?
The air vent valves can be closed
What happens if a centrifugal pump runs dry even for relatively short periods of time?
Serious damage occurs to pumps
What is the purpose of the foot valve in the suction line?
To prevent water from escaping the suction line
What is the recommended action if the suction pressure gauge indicates the strainer is plugging when starting the pump for the first time?
Stop the pump, remove the screens, clean, and re-install them
Why should the alignment of the pump and its driver be rechecked after they have run for a short time?
To confirm that the motor and pump have not shifted due to temperature changes
What is the purpose of checking the driver and pump rotation before starting the pump?
To check if the pump shaft turns in the correct direction
Why must a separate hand-operated positive displacement priming pump be used in some cases?
To avoid air entrapment in the pump casing
What is a common reason for troubles developing in new plants after a short period of operation?
Improper installation of the connecting piping
Why should bearings be carefully inspected, cleaned, and lubricated before starting any pump?
To avoid overheating and vibration of the pump bearings
Test your knowledge about the importance of priming a centrifugal pump before starting it, and the methods of priming. Learn about the risks associated with starting a pump without proper priming.
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