How to choose a submersible pump for a specific application?

Site Assessment and Pump Requirements

When selecting a submersible pump for a water well deep pump application, it’s essential to assess the site’s characteristics and determine the required pump specifications. For example, a pump installed in a well with a depth of 200 feet will require a higher head pressure rating than one installed in a shallower well. Consider the desired flow rate, which will influence the pump’s power consumption and motor size. A general rule of thumb is to allocate 1-2 horsepower (hp) for every 10 gallons per minute (GPM) of flow rate.

Pump Selection and Specification

Choose a pump with a suitable motor type, such as a permanent magnet (PM) or induction motor, depending on the application’s power requirements and site conditions. When selecting a submersible pump, consider the materials used in its construction, including the impeller, diffuser, and motor housing. For example, stainless steel or fiberglass-reinforced polymer (FRP) pumps can withstand harsh water conditions and corrosion. Ensure the pump is designed for the expected water temperature and pressure conditions.

Performance and Efficiency Considerations

A submersible pump’s performance and efficiency are crucial factors to consider when selecting a suitable model. Look for pumps with high efficiency ratings, typically measured in terms of the motor’s power factor or the pump’s total dynamic head (TDH). When evaluating a pump’s performance, consider its ability to handle sediment and debris, as well as its noise level and vibration characteristics. A pump with a built-in vortex pre-filter or a separate sediment separator can help minimize downtime and maintenance requirements.