Must-Knows for Site Dewatering with Submersible Pumps

Quick tips round up for improved submersible pump performance:

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Dewatering a construction or mining site can be challenging, and submersible pumps offer a flexible solution for managing water efficiently. They are widely used for their adaptability and ease of deployment.

Proper setup is essential to ensure reliable operation and maintain consistent performance. And, by focusing on these elements, operators can maximize efficiency and keep site dewatering running smoothly.

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Optimising Pump Placement

Small pumps are easy to use, but proper placement is critical for reliable operation. One common issue on construction sites is the pump burrowing into soft ground like sand or clay. This can reduce efficiency and risk damage. To prevent this, place the pump on a stable base such as coarse gravel or a plank. Another option is to suspend the pump using a rope or chain, which keeps it above the substrate and ensures even suction. A cut-down, perforated oil drum can also be used to elevate the pump and allow water to flow freely around it. Correct placement not only prevents the pump from sinking but also ensures a steady intake and reduces the risk of drawing in debris that could clog or damage the pump.

In Summary:

•  Place pumps on a stable base (gravel or plank) to prevent sinking.
•  Suspend pumps with a rope or chain to maintain even suction.
• Use a cut-down, perforated oil drum to elevate the pump and allow free water flow.
  
  

Hose Management

Hose layout directly affects pumping performance and efficiency. Sharp bends, kinks, or pinched hoses reduce flow and increase wear on the pump. To avoid this, orient the pump’s discharge connection so the hose begins in a straight line. Any changes in direction should be gradual, using smooth curves rather than tight angles. Check the hose regularly to ensure it is not twisted or pressed against obstacles, as this can cause localized wear or sudden drops in capacity. Proper hose management ensures that each pump can operate at full capacity, extends the life of hoses, and reduces maintenance needs.

In Summary:

• Start hoses in a straight line and use smooth curves for direction changes.
• Avoid kinks, twists, or pinching to maintain flow and prevent wear.
• Regularly inspect hoses for alignment and obstructions.
  
  

Tandem Pump Connections

When higher pumping heads are required, two or more pumps can be connected in series. This is done using a series connecting flange that links the pumps securely. Hoses in tandem setups must include check valves to prevent backflow. Without check valves, water can run back into the pumps during a power failure, causing wear or damage. Tandem arrangements are useful when lifting water to a higher elevation than a single pump can handle or when additional flow is required without switching to a larger pump. By carefully selecting the number of pumps and positioning them in series, operators can achieve the necessary head and flow while maintaining flexibility across the site.

In Summary:

• Connect pumps in series using a secure flange.
• Include check valves to prevent backflow during power failures.
• Adjust number and placement of pumps to achieve required head and flow.
  
  

Long-Distance Pumping and Collection Pits

Tandem pumps are also effective for moving water over long distances or from multiple points across a site. In this setup, several small pumps collect water from different locations and discharge into a central collection pit. The collection pit is then equipped with a larger pump to transport water off-site. This allows the smaller pumps to handle localized water accumulation while a single larger pump manages the main discharge. It is particularly useful for sites with uneven water distribution or temporary flooding. Using a collection pit system also provides flexibility to adjust pump locations as site conditions change. Multiple pumps can be moved or added easily without disrupting the overall system, making it scalable for different site sizes and water volumes.

In Summary:

• Use multiple small pumps to collect water from different locations.
• Discharge into a central collection pit equipped with a larger pump.
• System allows flexible positioning and scalable operation for varying site sizes.
  
  

Practical Considerations

To maintain efficiency, ensure that all pumps are easily accessible for inspection and maintenance. Regularly check that hoses are properly aligned, valves are functioning, and intake screens are clear of debris. When setting up a collection pit, consider the water volume and size of the main pump to prevent overflow or pump overloading. Placement of pumps and hoses should also account for site traffic and safety, ensuring that equipment is not obstructing operations or creating hazards. Following these practical steps reduces downtime, prevents unnecessary wear, and ensures consistent pumping across the site.

In Summary:

- Ensure pumps are accessible for inspection and maintenance.

- Keep valves, intake screens, and hoses clear and properly aligned.

- Consider site traffic and safety when placing pumps and hoses.

-ends

>> Download the Grindex submersible pumps brochure.