A shallow well jet water pump is used to push water from a shallow well for various homes or businesses. This pump uses an impeller to pull water from a shallow well.
A shallow well jet pump is composed of an impeller, electric motor and additional jet components. The pump with contains the jet assembly and impeller is situated above the ground thus making servicing of the jet pump easier than servicing of a submersible water well pump.
Things that are needed for jet pump installation:
- Foot valve
- Suction pipe
- Pressure tank
- Pressure switch
- Pipe-thread sealant
- Discharge pressure control valve
- Water pressure gauge-Optional
- Adjustable and pipe wrenches.
- Discharge pressure
- Cross tee fitting (sized for discharge pipe)
- Discharge pipe
Procedure for shallow well jet pump installation:
- If unknown, the depth of the well is measured. A heavy screw or nut is placed on a twine length and lowered into the casing of the well until the nut/ screw touches the base of the well. The length of twine is marked at the well casing and then the twine is removed from the well and the length of twine measured from the mark that is on the nut.
- The amount of voltage connections required by the pump is determined. To select the best jet pump for the available power supply and the desired water flow rate it is advisable to consult a local water pump dealer. Hire a licensed electrician to wire the jet pump.
- The foot valve is installed at the end of the suction line and then the suction line is measured to ensure that the foot valve is 5 feet or more above the bottom/ base of the well. Thread sealant is then used on the pump’s pipe connections to ensure complete seal.
- A cross-tee fitting is installed on the pump discharge then the pressure tank is connected to the tee with both a threaded pipe and pipe sealant. A pipe reducer, ball valve, and a cap are installed on the other side of the tee to create a connection for priming the pump. An optional gauge can be added when priming is complete to promote visibility of the pressure pump.
- If indicated by the manufacturer a ball valve in installed to control the discharge pressure.
- The pressure switch is installed downstream of the tee then the pressure switch is set to pump water. The highest pressure of water should be 80 psi to avoid water leakage. The pressure switch wiring is then connected to the jet pump’s electrical connection and power supply.
- Finally the installed cap is opened and the pump casing is filled with water. The faucet is opened to let out air during priming and the pump is started with the faucet still open to allow the air to escape. The pump is stopped and priming is repeated until the water flows out through the faucet.
If the jet pump does not pump water it is examined for any leaks and any jet well pump problems corrected immediately.
Maintenance of jet pumps
A jet well pump does not require regular maintenance except when the nozzle is plugged with dirt during new installation. The pump should never run dry as this will cause leakage through the shaft seal.
Since shallow well jet pumps come in a variety of designs is it advisable to buy a jet well pump design that is cost-effective and of good quality.