Quick Answer
To determine the correct jet size for your pump, divide the total dynamic head (TDH) by the differential head. Then, multiply this result by 0.1 to 0.5 to get the required jet size in inches.
Calculating Jet Size
To accurately determine the correct jet size for your shallow well pump, you need to calculate the total dynamic head (TDH). This is the total vertical distance water must be lifted from the well to the pump, including the static head, friction losses, and any other losses. Typically, a shallow well pump operates at a TDH of 50 to 100 feet.
Considering Pump Type and Well Conditions
Different pump types and well conditions require different jet sizes. For example, a centrifugal pump with a 2-inch impeller requires a minimum jet size of 1.25 inches to ensure efficient operation. In contrast, a self-priming jet pump may require a larger jet size, such as 1.5 inches, to compensate for the additional energy required to prime the well.
Practical Considerations for Jet Size Selection
When selecting the correct jet size, consider the pump’s flow rate and the well’s water level. A larger jet size may be required for higher flow rates or deeper wells. However, be cautious not to oversize the jet, as this can lead to increased energy consumption and reduced pump efficiency. A general rule of thumb is to start with a jet size of 1.25 to 1.5 inches and adjust as needed based on pump performance and well conditions.
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