Doodlebug Pump -- FAQ

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Jet Pumps

How Do Jet Pumps Work?

Jet Pumps are a specially modified type of Centrifugal Pump designed to generate relatively high water pressures from a single stage.

They are manufactured in two forms; Convertible and Shallow Well.

Shallow Well Jet Pumps - In areas of Southern California, Arizona or Florida, where ground water is very close to the surface or is supplied through a canal system this is the pump of choice. It is relatively enexpensive and requires little maintiance.

If you have a storage tank or cistern this is the perfect application. You can also use a Jet Pump to boost low city water pressure.

You should always use a pressure tank with a Jet Pump. The pressure tank creates a time delay so that the pump does not short-cycle. It holds sufficient water under pressure to allow you to wash your hands or flush a toilet without the pump turning on.

As a rule of thumb. Purchase as large a tank as you can afford. The larger the tank the less the pump will cycle. This saves you both money and pump repairs.

Booster Applications - In this application you wish to raise low water pressure to a higher level. For example your normal pressure is only 25 PSI and you would like to have 50 or 60 PSI. For this application a Jet Pump is the perfect choice.

In either of the above examples you would also have to use a check valve or foot valve. It prevents the higher pressure from returning back to the city main, storage tank or cistern.

Deep Well Applications - Jet Pumps can also be used for deep well applications. Jet Pumps can pull water from up to 25 ft. vertical, meaning you can place the pump 25 ft. above the water source, of course the deeper you go the less water is produced. No pump can pull more than 25 ft.

In this case a Convertable Jet Pump must be used. This allows the pump over come the 25' depth limitation by utilizing two pipes and a special "deep well" foot valve.

It works by injecting a stream of water down from the pump and forcing water up thru a second pipe, which is again injected into the pump. Using this system it is possible to draw water from over 100' below the ground.

It is not the most efficient type of pump, but it has the advantage of the pump being on the surface for easy servicing and allowing the piping to go down a well casing that is smaller then the typical 4" size necessary to utilize a Submersible Pump.

Submersible Vs. Jet-Submersible Pumps are more efficient than Jet Pumps because the pump is in the water and pushes the water up. Typical efficiencies for submerisbles are 70% while jet pump can be as low as 35%. Typically, a smaller HP Submersible Pump can be used to achieve the same results as a higher HP Jet. The downside is the Submersible Pump is down in the well and has to be pulled up to the surface for service.

Typical Pressure Switch Settings - Jet Pumps can produce pressures up to 60 or 70 PSI but normal operating ranges are 20/40, 30/50 or 40/60 PSI. 20 PSI is a standard for in between ranges meaning the difference between the start-stop of the pump.

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We just bought a cabin with a well. It is winterized at the moment. We need to start it up. It is a General Electric 5KH36EN3003T. 1/3 hp HZ60 115V ph1 3450 RPM Code S Jet Pump Motor. We have a holding tank and pump under the sink. We cannot seem to keep a prime. Can you suggest anything? Thanks for your response. my email is CML122702@yahoo.com

The problem is most likely a defective foot valve or check valve on the suction side of the pump. If this fails, the pump will not hold prime. This assumes you have no suction leaks between the inlet of the pump and the point where the piping is in the water.

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We have a jet pump, bladder pressure tank and pump water to our home from a spring. Our pump will kick on and build 40 psi, kick off, and lose the pressure. And repeats that cycle over and over. We have checked for leaks and found none, we have changed the pressure switch on the pump, installed a new foot valve, added air to the pressure tank (it was low, but it is holding air now and is about 6 years old). We cannot figure out what is wrong and why we lose pressure. Sonya Baumgardner sonyab@naxs.net

The problem you are describing is a loss of pressure in the system. Normally, I would suspect the foot valve, but you said you replaced it. So the "leak" must be somewhere else. Consider how the system is designed to work. When the pump turns off at the high pressure switch setting ( example: 30/50 switch setting), the foot valve prevents the water from running backward, back into the source. If the foot valve is holding, then the pressure should remain at 50 psi unitl you need more water. Then the pressure fall to 30 psi and the pump turn on. What you describe leads me to believe you have a constant leaking in the piping system (at a fairly high rate) which causes the pump to cycle on & off. If you have not installed a shut off valve down stream of the pressure tank on the line going to your house, do so. With this valve turned off, you should beable to quickly isolate where the leak is at. Correct the problem & your "cycling should stop"

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what type of pressure regulator is used to connect to pressure switch - and does a (T) go in between line to Air Trol defice on tank using Model HJ meyers deep weel pump with 62 gal steel tank-

The pressure regulator is not connected to the pressure switch. It is connected on the discharge side of the pump and as the name implies, it is used to control the output pressure of the pump.

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		Doodlebug Pump -- FAQ Welcome to the FAQ page. This is where you will find the answers to frequently asked questions. We are constantly adding to this section, it covers submersible pumps, jet pumps, jet pump trouble shooting, pressure tanks, pressure tank sizing,level control, Reverse Osmosis Filter Systems, Questions About UV Sterilizers & Water Softeners If you have a question - please include your e-mail address. We will not answer unknown requests. here Jet Pumps General Questions About Jet Pumps How Do Jet Pumps Work? We just bought a cabin with a well. It is winterized at the moment. We need to start it up. It is a General Electric 5KH36EN3003T. 1/3 hp HZ60 115V ph1 3450 RPM Code S Jet Pump Motor. We have a holding tank and pump under the sink. We cannot seem to keep a prime. Can you suggest anything? Thanks for your response. my email is CML122702@yahoo.com We have a jet pump, bladder pressure tank and pump water to our home from a spring. Our pump will kick on and build 40 psi, kick off, and lose the pressure. And repeats that cycle over and over. We have checked for leaks and found none, we have changed the pressure switch on the pump, installed a new foot valve, added air to the pressure tank (it was low, but it is holding air now and is about 6 years old). We cannot figure out what is wrong and why we lose pressure. Sonya Baumgardner sonyab@naxs.net what type of pressure regulator is used to connect to pressure switch - and does a (T) go in between line to Air Trol defice on tank using Model HJ meyers deep weel pump with 62 gal steel tank- Jet Pumps How Do Jet Pumps Work? Jet Pumps are a specially modified type of Centrifugal Pump designed to generate relatively high water pressures from a single stage. They are manufactured in two forms; Convertible and Shallow Well. Shallow Well Jet Pumps - In areas of Southern California, Arizona or Florida, where ground water is very close to the surface or is supplied through a canal system this is the pump of choice. It is relatively enexpensive and requires little maintiance. If you have a storage tank or cistern this is the perfect application. You can also use a Jet Pump to boost low city water pressure. *You should always use a pressure tank with a Jet Pump.* The pressure tank creates a time delay so that the pump does not short-cycle. It holds sufficient water under pressure to allow you to wash your hands or flush a toilet without the pump turning on. As a rule of thumb. Purchase as large a tank as you can afford. The larger the tank the less the pump will cycle. This saves you both money and pump repairs. Booster Applications - In this application you wish to raise low water pressure to a higher level. For example your normal pressure is only 25 PSI and you would like to have 50 or 60 PSI. For this application a Jet Pump is the perfect choice. In either of the above examples you would also have to use a check valve or foot valve. It prevents the higher pressure from returning back to the city main, storage tank or cistern. Deep Well Applications - Jet Pumps can also be used for deep well applications. Jet Pumps can pull water from up to 25 ft. vertical, meaning you can place the pump 25 ft. above the water source, of course the deeper you go the less water is produced. No pump can pull more than 25 ft. In this case a Convertable Jet Pump must be used. This allows the pump over come the 25' depth limitation by utilizing two pipes and a special "deep well" foot valve. It works by injecting a stream of water down from the pump and forcing water up thru a second pipe, which is again injected into the pump. Using this system it is possible to draw water from over 100' below the ground. It is not the most efficient type of pump, but it has the advantage of the pump being on the surface for easy servicing and allowing the piping to go down a well casing that is smaller then the typical 4" size necessary to utilize a Submersible Pump. Submersible Vs. Jet-Submersible Pumps are more efficient than Jet Pumps because the pump is in the water and pushes the water up. Typical efficiencies for submerisbles are 70% while jet pump can be as low as 35%. Typically, a smaller HP Submersible Pump can be used to achieve the same results as a higher HP Jet. The downside is the Submersible Pump is down in the well and has to be pulled up to the surface for service. Typical Pressure Switch Settings - Jet Pumps can produce pressures up to 60 or 70 PSI but normal operating ranges are 20/40, 30/50 or 40/60 PSI. 20 PSI is a standard for in between ranges meaning the difference between the start-stop of the pump. Return to top We just bought a cabin with a well. It is winterized at the moment. We need to start it up. It is a General Electric 5KH36EN3003T. 1/3 hp HZ60 115V ph1 3450 RPM Code S Jet Pump Motor. We have a holding tank and pump under the sink. We cannot seem to keep a prime. Can you suggest anything? Thanks for your response. my email is CML122702@yahoo.com The problem is most likely a defective foot valve or check valve on the suction side of the pump. If this fails, the pump will not hold prime. This assumes you have no suction leaks between the inlet of the pump and the point where the piping is in the water. Return to top We have a jet pump, bladder pressure tank and pump water to our home from a spring. Our pump will kick on and build 40 psi, kick off, and lose the pressure. And repeats that cycle over and over. We have checked for leaks and found none, we have changed the pressure switch on the pump, installed a new foot valve, added air to the pressure tank (it was low, but it is holding air now and is about 6 years old). We cannot figure out what is wrong and why we lose pressure. Sonya Baumgardner sonyab@naxs.net The problem you are describing is a loss of pressure in the system. Normally, I would suspect the foot valve, but you said you replaced it. So the "leak" must be somewhere else. Consider how the system is designed to work. When the pump turns off at the high pressure switch setting ( example: 30/50 switch setting), the foot valve prevents the water from running backward, back into the source. If the foot valve is holding, then the pressure should remain at 50 psi unitl you need more water. Then the pressure fall to 30 psi and the pump turn on. What you describe leads me to believe you have a constant leaking in the piping system (at a fairly high rate) which causes the pump to cycle on & off. If you have not installed a shut off valve down stream of the pressure tank on the line going to your house, do so. With this valve turned off, you should beable to quickly isolate where the leak is at. Correct the problem & your "cycling should stop" Return to top what type of pressure regulator is used to connect to pressure switch - and does a (T) go in between line to Air Trol defice on tank using Model HJ meyers deep weel pump with 62 gal steel tank- The pressure regulator is not connected to the pressure switch. It is connected on the discharge side of the pump and as the name implies, it is used to control the output pressure of the pump. Return to top

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