Question 1 of 8
Intermediate

What is the main disadvantage of over-dimensioning a wastewater pit?

Question 2 of 8
Intermediate

Why is it important that the distance between the start and stop level is not too long?

Question 3 of 8
Intermediate

What is the purpose of the start level sensor?

Question 4 of 8
Intermediate

What are the main virtues of the S-tube® impeller?

Question 5 of 8
Intermediate

What are the benefits of a pumping station with a separate valve chamber?

Question 6 of 8
Intermediate

How far below ground should the manifold – or the discharge pipe – be installed?

Question 7 of 8
Intermediate

What is drainage water?

Question 8 of 8
Intermediate

What is parallel operation?

Question 8 of 8
Intermediate

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1: What is the main disadvantage of over-dimensioning a wastewater pit?
Unnecessary investment in the larger civil work.
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1: What is the main disadvantage of over-dimensioning a wastewater pit?
Too big distance between the pumps with two or more pumps installed.
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1: What is the main disadvantage of over-dimensioning a wastewater pit?
The wastewater stays in the pit too long, which leads to sedimentation.
2: Why is it important that the distance between the start and stop level is not too long?
If the distance is too long, the contractor shall dig too deep in the ground for the pump station.
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2: Why is it important that the distance between the start and stop level is not too long?
If the distance is too long, it might require longer motor cable for the pump due to the depth of the pump station.
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2: Why is it important that the distance between the start and stop level is not too long?
If the distance is too long it reduces the number of cycles, which may cause sedimentation because the water stays in the pit too long.
3: What is the purpose of the start level sensor?
It will send an alarm when the water reaches this level and the pump do not start.
3: What is the purpose of the start level sensor?
It will stop the pump when the water level is lowered to below this level after a pump start.
3: What is the purpose of the start level sensor?
It activates the pump when the water reaches this level.
4: What are the main virtues of the S-tube® impeller?
It offers both excellent efficiency and large free passage.
4: What are the main virtues of the S-tube® impeller?
The S-tube® impeller is available in both cast iron and stainless steel.
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4: What are the main virtues of the S-tube® impeller?
The S-tube® impeller do not generate vibrations resulting in longer lifetime on shaft seals and bearings.
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5: What are the benefits of a pumping station with a separate valve chamber?
It allows service and maintenance on the valves to be carried out without human interaction with the pit itself.
5: What are the benefits of a pumping station with a separate valve chamber?
The pump station do not need to be that deep, because now the valves are not in the chamber with the wastewater.
5: What are the benefits of a pumping station with a separate valve chamber?
There is no need for an intermediate deck in the pump station for the people there shall service or maintain the valves.
6: How far below ground should the manifold – or the discharge pipe – be installed?
It depends on local regulation but typically 1 meter down.
6: How far below ground should the manifold – or the discharge pipe – be installed?
Deep enough not to be damaged by roots from trees and bushes.
6: How far below ground should the manifold – or the discharge pipe – be installed?
Not deeper than gravity to the recipient can be established with a gradient of 1 cm per meter. (0.032 ft per 3.28 ft).
7: What is drainage water?
Wastewater from parking areas, sidewalks and alike after a rainy weather.
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7: What is drainage water?
Wastewater without toilet waste or impurities like paper, diapers and textile fibres.
7: What is drainage water?
Slightly polluted water from a bathroom where the water is running to the drain.
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8: What is parallel operation?
When two or more pump stations are operating at the same time.
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8: What is parallel operation?
When two or more pumps operate side by side simultaneously.
8: What is parallel operation?
When one pump is pumping into another pump and they are operating at the same time.
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