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8 Steps to Choosing a Construction Dewatering Pump

8 Steps to Choosing a Construction Dewatering Pump

Dat: 2024-06-27 Clicks:


Pump selection is more complicated than it may seem. Tide Power can help you perform the necessary measurements and calculations, choose an appropriate pump and design a system that does the job efficiently and at the lowest cost.

 

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Following these eight steps can help ensure the selection of an effective dewatering system design:

 

1. Consider the Water Source

The pump needed to dewater a site that gets 2 or 3 inches of standing water after a heavy rain is likely to be different in type and size from the one required when water is constantly seeping into an excavation or running along the ground due to a high water table. A more powerful pump designed for long-term use may be required for continual operation.

 

2. Check the Solids Content

The water on a construction site will never be completely clear, but the type and amount of debris and solids it carries will vary greatly from location to location. 

 

The solids content influences the type of pump needed. Using the wrong pump to move water with a heavy concentration of sludge or other materials will likely result in system failure.

 

3. Determine the Flow Rate Required

The maximum flow rate needed is one of the critical pieces of data necessary to properly size a pump. The gallons per minute or cubic meters per minute of water entering the site will determine the required flow rate and pump capacity.

 

When it comes to maintaining the outward flow of water, the closer a pump can be located to the water source, the better. If the distance between pump and water is greater than 100 feet, the dewatering system may require larger piping or conduit.

 

4. Measure the pH  

One factor often overlooked in dewatering pump selection is the pH of the water. Water that is acidic or basic can damage pumps and cause project delays. When the pH is outside the normal range, pumps made with corrosion-resistant materials are the ideal choice.

 

5. Measure the Pumping Distance  

Pumping over large distances typically requires a pump with more horsepower, as well as larger hoses or pipes to reduce friction losses. Depending on the distance, multiple pumps may be necessary.

 

6. Calculate the NPSH  

The net positive suction head (NPSH) also influences the required pump size, but contractors sometimes fail to factor it in.

 

NPSH is the difference between the pressure available at the suction port of the pump (NPSHa) and the pressure required to keep the pump operating properly (NPSHr). The NPSH calculation factors in the temperature and vapor pressure of the water being moved, the atmospheric pressure and friction losses. Using a pump with insufficient NPSH can lead to cavitation and pump breakdown.

 

7. Calculate the Required Static Suction Lift  

The vertical lift from the lowest point of the water being pumped to the center or eye of the impeller is known as the static suction lift. The greater the suction lift, the lower the pump flow capacity.

 

A good rule of thumb is that at sea level, a properly operating vacuum-assisted priming pump can perform a static lift of 28 feet to the eye of the impeller. For every 1,000 feet of elevation, deduct one foot of priming capability.

 

8. Rely on Expert Advice   

There is a lot riding on proper pump selection. If the dewatering system fails or a pump breaks down, water can start collecting on the site, slowing operations or bringing them to a stop.

 

 

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