Question 1 of 8
Intermediate

What could be the consequences of using an undersized pump in a well?

Question 2 of 8
Intermediate

What should the minimum flow past the motor be to ensure sufficient motor cooling?

Question 3 of 8
Intermediate

How is it possible to protect the motor against bad power supply?

Question 4 of 8
Intermediate

Why is it important to know the water drawdown?

Question 5 of 8
Intermediate

What may cause friction loss in the pipes?

Question 6 of 8
Intermediate

In which areas is there a bigger risk of pumping corrosive groundwater?

Question 7 of 8
Intermediate

What kind of riser pipe is most likely to keep itself free from scaling?

Question 8 of 8
Intermediate

By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?

Question 8 of 8
Intermediate

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1: What could be the consequences of using an undersized pump in a well?
The pump will give too high pressure
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1: What could be the consequences of using an undersized pump in a well?
The risk of cavitation is very high
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1: What could be the consequences of using an undersized pump in a well?
The pump may not be able to deliver the required capacity
2: What should the minimum flow past the motor be to ensure sufficient motor cooling?
0,5 m/s
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2: What should the minimum flow past the motor be to ensure sufficient motor cooling?
0,15 m/s
2: What should the minimum flow past the motor be to ensure sufficient motor cooling?
There are no specific requirements
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3: How is it possible to protect the motor against bad power supply?
By means of an electronic motor protection that senses all possible deviations
3: How is it possible to protect the motor against bad power supply?
By means of a UC filter
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3: How is it possible to protect the motor against bad power supply?
By using a special water resistant cabling
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4: Why is it important to know the water drawdown?
The more the drawdown increases during pump operation, the more pressure is required to lift the groundwater to the surface
4: Why is it important to know the water drawdown?
Increased drawdown leads to poor water quality
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4: Why is it important to know the water drawdown?
Steel casings may not be used if the drawdown is too big
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5: What may cause friction loss in the pipes?
Scaling
5: What may cause friction loss in the pipes?
Poor water quality
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5: What may cause friction loss in the pipes?
High water temperature
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6: In which areas is there a bigger risk of pumping corrosive groundwater?
In forests with old trees
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6: In which areas is there a bigger risk of pumping corrosive groundwater?
In coastal areas
6: In which areas is there a bigger risk of pumping corrosive groundwater?
In elevations above 1000 m
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7: What kind of riser pipe is most likely to keep itself free from scaling?
Plastic hoses
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7: What kind of riser pipe is most likely to keep itself free from scaling?
Stainless steel pipes
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7: What kind of riser pipe is most likely to keep itself free from scaling?
Flex hoses
8: By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?
The by-passed water is wasted and cannot be used again
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8: By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?
The motor temperature rises and increases the risk of motor burn-out
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8: By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?
Energy is wasted as the pump continues to run at full speed