Quick Answer
Well depth influences pump selection by requiring deeper pumps for shallower wells and potentially larger horsepower for deeper wells. Deeper wells require pumps that can handle higher pressures and possibly more flow rates. A well's depth can also impact the choice between submersible, jet, or other types of pumps.
Choosing the Right Submersible Pump
When selecting a submersible pump for a deep well, consider the well’s static water level, which is the level at which water stands in the well without pumping. A submersible pump’s performance is affected by this level, as it will need to pump water from a greater depth. For example, a well with a static water level of 200 feet will require a pump capable of handling this depth. In general, submersible pumps are suitable for wells up to 1,000 feet deep, but the specific pump selected will depend on factors such as the well’s diameter, the pump’s suction distance, and the required flow rate.
Calculating System Requirements
To select the correct submersible pump, calculate the well’s total dynamic head (TDH), which is the sum of the static water level, the pump’s suction lift, and the discharge head (pressure). For example, if a well has a static water level of 200 feet, a suction lift of 50 feet, and a discharge head of 100 feet, the total TDH would be 350 feet. This value, combined with the well’s flow rate, will help determine the required horsepower (HP) and pump size. A general rule of thumb is to select a pump with a HP rating 10-20% higher than calculated to account for potential losses and variations in well conditions.
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