What may cause friction loss in the pipes?
Why is it important to know the water drawdown?
How does over- and under voltage, phase unbalance and phase loss impact the pump motor?
By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?
In which areas is there a bigger risk of pumping corrosive groundwater?
What should the minimum flow past the motor be to ensure sufficient motor cooling?
What could be the consequences of using an undersized pump in a well?
How is it possible to protect the motor against bad power supply?
Test results
Congratulations. You have passed the test and completed the 17 - Groundwater Pumping
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Q: What may cause friction loss in the pipes?
A: Scaling
Q: What may cause friction loss in the pipes?
A: Poor water quality
Q: What may cause friction loss in the pipes?
A: High water temperature
Q: Why is it important to know the water drawdown?
A: The more the drawdown increases during pump operation, the more pressure is required to lift the groundwater to the surface
Q: Why is it important to know the water drawdown?
A: Increased drawdown leads to poor water quality
Q: Why is it important to know the water drawdown?
A: Steel casings may not be used if the drawdown is too big
Q: How does over- and under voltage, phase unbalance and phase loss impact the pump motor?
A: It increases speed and thereby the performance of the pump
Q: How does over- and under voltage, phase unbalance and phase loss impact the pump motor?
A: It raises the motor temperature, reducing the lifetime
Q: How does over- and under voltage, phase unbalance and phase loss impact the pump motor?
A: It reduces flow and pressure
Q: By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?
A: The by-passed water is wasted and cannot be used again
Q: By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?
A: The motor temperature rises and increases the risk of motor burn-out
Q: By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?
A: Energy is wasted as the pump continues to run at full speed
Q: In which areas is there a bigger risk of pumping corrosive groundwater?
A: In forests with old trees
Q: In which areas is there a bigger risk of pumping corrosive groundwater?
A: In coastal areas
Q: In which areas is there a bigger risk of pumping corrosive groundwater?
A: In elevations above 1000 m
Q: What should the minimum flow past the motor be to ensure sufficient motor cooling?
A: 0,5 m/s
Q: What should the minimum flow past the motor be to ensure sufficient motor cooling?
A: 0,15 m/s
Q: What should the minimum flow past the motor be to ensure sufficient motor cooling?
A: There are no specific requirements
Q: What could be the consequences of using an undersized pump in a well?
A: The pump will give too high pressure
Q: What could be the consequences of using an undersized pump in a well?
A: The risk of cavitation is very high
Q: What could be the consequences of using an undersized pump in a well?
A: The pump may not be able to deliver the required capacity
Q: How is it possible to protect the motor against bad power supply?
A: By means of an electronic motor protection that senses all possible deviations
Q: How is it possible to protect the motor against bad power supply?
A: By means of a UC filter
Q: How is it possible to protect the motor against bad power supply?
A: By using a special water resistant cabling