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Questions and Answers
What is a characteristic sound of a cavitating pump?
What is a characteristic sound of a cavitating pump?
- A hissing sound
- Complete silence
- A sound like a can of marbles being shaken (correct)
- A smooth humming noise
What are some indications of a cavitating pump that can be observed from a remote operating station?
What are some indications of a cavitating pump that can be observed from a remote operating station?
- Decreasing discharge pressure, flow rate, and pump motor current
- Fluctuating discharge pressure, flow rate, and pump motor current (correct)
- Increasing discharge pressure, flow rate, and pump motor current
- Constant discharge pressure, flow rate, and pump motor current
What is an unusual aspect of a cavitating pump's operation?
What is an unusual aspect of a cavitating pump's operation?
- Varying discharge pressure
- Fluctuating flow rate (correct)
- Stable flow rate
- Constant pump motor current
What can be monitored to detect signs of a cavitating pump?
What can be monitored to detect signs of a cavitating pump?
Why is it important to monitor a pump's performance from a remote operating station?
Why is it important to monitor a pump's performance from a remote operating station?
What is the net positive suction head available (NPSHA) a measure of?
What is the net positive suction head available (NPSHA) a measure of?
What is the significance of the saturation pressure in the calculation of NPSHA?
What is the significance of the saturation pressure in the calculation of NPSHA?
What happens if the NPSHA is not sufficient for the pump?
What happens if the NPSHA is not sufficient for the pump?
What is the purpose of calculating NPSHA in pump design?
What is the purpose of calculating NPSHA in pump design?
What is the relationship between the NPSHA and the pump's suction pressure?
What is the relationship between the NPSHA and the pump's suction pressure?
What can happen to a centrifugal pump if it is run in shutoff head conditions for a significant amount of time?
What can happen to a centrifugal pump if it is run in shutoff head conditions for a significant amount of time?
Why is pump protection necessary in certain systems?
Why is pump protection necessary in certain systems?
What type of condition can cause damage to a centrifugal pump?
What type of condition can cause damage to a centrifugal pump?
Why is it necessary to provide some means of pump protection in certain systems?
Why is it necessary to provide some means of pump protection in certain systems?
What is the result of a centrifugal pump being subjected to periodic shutoff head conditions without proper protection?
What is the result of a centrifugal pump being subjected to periodic shutoff head conditions without proper protection?
What is the main component of a simple gear pump?
What is the main component of a simple gear pump?
In which direction do the spur gears revolve in a simple gear pump?
In which direction do the spur gears revolve in a simple gear pump?
What is the purpose of the casing in a simple gear pump?
What is the purpose of the casing in a simple gear pump?
What type of gears are used in a simple gear pump?
What type of gears are used in a simple gear pump?
How many gears are there in a simple gear pump?
How many gears are there in a simple gear pump?
What is one way to reduce the power required by a pump?
What is one way to reduce the power required by a pump?
Which of the following can help reduce head losses in a pump system?
Which of the following can help reduce head losses in a pump system?
What is an effect of increasing the speed of the pump impeller?
What is an effect of increasing the speed of the pump impeller?
What is a potential consequence of reducing the flow rate through a pump?
What is a potential consequence of reducing the flow rate through a pump?
What is a benefit of reducing head losses in the pump suction piping?
What is a benefit of reducing head losses in the pump suction piping?
Study Notes
Cavitating Pump
- Sounds like a can of marbles being shaken due to cavitating
- Indications of cavitating pump:
- Fluctuating discharge pressure
- Fluctuating flow rate
- Fluctuating pump motor current
- Causes damage to the pump if run in this condition for a significant amount of time
- Occurs when the net positive suction head available (NPSHA) is lower than the required level
- NPSHA is the difference between the pressure at the suction of the pump and the saturation pressure for the liquid being pumped
Pump Protection
- Necessary when a centrifugal pump is installed in a system with periodic shutoff head conditions
- Methods to provide pump protection:
- Reduce the temperature of the liquid being pumped
- Reduce head losses in the pump suction piping
- Reduce the flow rate through the pump
- Reduce the speed of the pump impeller
Simple Gear Pump
- Consists of two spur gears meshing together and revolving in opposite directions within a casing
- Has several variations, with the one shown in Figure 14 being a simple example
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Description
Identify the signs of a cavitating pump, including unusual sounds, fluctuating discharge pressure, flow rate, and pump motor current. Learn to recognize these indications from a remote operating station.
