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et Pumps InformationShow all Jet Pumps Manufacturers Find by Specification:

Maximum Discharge Flow: 23 GPM and up

Maximum Discharge Pressure:

61 to 69 psi 69 to 281 psi 281 psi and up

Inlet Size:

2 to 2 inch 4 to 4 inch 6 to 6 inch

More Specifications >>

How to Select Jet Pumps

Image Credit: Griffin Pump & Equipment Inc. | Watts

Jet pumps, also known as ejector pumps, are devices capable of handling and transporting allforms of motive fluid including gas, steam, or liquid. They can be considered mixers or circulators, since the intake combines multiple fluid sources. Multiple inlets are used to draw in aconstant stream of fluid, using pressure to create lift through suction. The combination of intake

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pressure and velocity of the liquid or gas jets the media up from a well, tank, or pit through the pump to the discharge point.

Jet pumps are less efficient than typical centrifugal pumps due to such factors as friction loss, butmay be more efficient when working with combined media that includes gases, and in variablewell conditions where the surface characteristics involve turbulence.

Operation

Jet pumps are centrifugal pumps with an ejector (venturi nozzle) attached at the discharge outlet.They function based upon the Venturi effect of Bernoulli's principle - utilizing constriction toreduce pressure and provide suction. After the pump is primed, a motive fluid is pumpedthrough a standard centrifugal pump and enters an ejector. At the throat of the converging sectionof the ejector, the pressurized fluid is ejected at high velocity. This creates a low pressure(vacuum) at the throat, drawing the target fluid (from a well or other source) up into the nozzle.This picture is a diagram of the ejector portion of a jet pump:

Image Credit: Mbeychok (Wikipedia)

This video provides visual explanation of a jet a pump's operation:

Video Credit: iecSimulations

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Composition

Jet pumps consist of three sections: a centrifugal pump, a jet ejector package, and a foot valve.

The centrifugal pump generates the force which circulates the motive fluid through theejector, typically using an impeller powered by a motor. For more information ondifferent types of centrifugal pumps, visit How to Select Centrifugal Pumps onGlobalSpec.

The jet ejector package (the nozzle, venturi, and various connections) is often separatefrom the pump before installation. Ejector components are carefully engineered to matchthe flow rate of a specific pump. During installation, it is important to read the ejector

package instructions and set the package up correctly for the specific horsepower of the pump.

The foot valve is the section connected to the well or target resevoir. It receives fluid intothe system and feeds the pump, filters debris and sediment from entering the system, andmaintains the pump prime, preventing backflow.

Jet pump system, indicating its various components. Image Credit: National Resources Management and Environmental Department

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Types

There are four main types of jet pumps, which vary based on application and size.

Deep well jet pumps are used in high volume applications, such as oil wells, which rangefrom 800-15,000 feet in depth. The ejectors in these pumps are put down the well.

Shallow well pumps are used in applications where the media is close to the surface, suchas residential wells. The ejectors in these pumps are bolted to the nose of the pump.

Convertible jet pumps are "convertible", meaning they can be set up to be used for either deep or shallow well applications.

Miniature jet pumps are used for smaller (typically commercial) applications, such asaquariums.

SpecificationsThe primary specifications to consider when selecting jet pumps are flowrate, pump head,

pressure, horsepower, power rating, outlet diameter, and operating temperature. GlobalSpec'sPump Flow page describes these performance specifications in detail. One importantconsideration specific to jet pumps is this: if external pressures and internal pressures exceed thematerial specifications and the pressure specifications of the jet pump, the throat of the pump cancollapse and cause damage or extreme reductions in flow.

MaterialsHousing materials for jet pumps include plastics, steel alloys, and cast iron.

Plastics , including polypropylene (PP), polyvinyl chloride (PVC), acrylic, and polytetrafluoroethylene (PTFE), are less expensive and provide resistance to corrosionand a broad range of chemicals.

Steel alloys , including stainless steel, are stronger and more abrasion resistant than plastics and provide good corrosion and chemical resistance.

Cast iron provides high strength and abrasion resistance.

For more on materials and other pump features, visit GlobalSpec's Pump Features page.

Applications

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Jet pumps are typically inserted vertically into the process media, but can be mountedhorizontally as well. They are often used in applications where the material that is pumpedassists in creating the motive force needed to move through the pump. For example, in marineapplications, jet pumps are used to transfer seawater. In home applications, they are used tomove wastewater up to the sewer line. A float level sensor and switch are used to turn on the

pump.

GlobalSpec's Pump Applications page provides an overview of pump types used for specificapplications.

Jet Pump Suppliers on GlobalSpec

Gicon Pumps and Equipment

Grainger Industrial Supply

Griffin Pump & Equipment, Inc.

Watts

References

Flotec - Jet Pump FAQs

Goulds Pumps - Jet Pumps Installation

Related Products & Services

Dosing Pumps Dosing pumps are low-volume fluid pumps with controllable discharge rates used to injectadditives into the mixing or pumping system.Magnetic Drive Pumps

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Magnetic drive pumps are sealless pumps that use a coaxial magnetic coupling to transmit torqueto an impeller. A standard electric motor drives a set of permanent magnets that are mounted ona carrier or drive assembly.Plastic Pumps Plastic pumps are designed to move fluids that would corrode or damage other types of pumps.

They provide broad chemical resistance and are less costly and lighter in weight than metal pumps.Positive Displacement Pumps Positive displacement pumps use a mechanical force such as gears, bladders, pistons, plungers or diaphragms to push liquid through and out of the pump.Progressing Cavity Pumps Progressing cavity pumps are a type of rotary positive displacement pump designed to transfer fluid or media with suspended solids or slurries from the suction side of the pump to thedischarge side of the pump, from storage tanks or through pipelines.Sanitary Pumps Sanitary pumps are used to transport and meter solutions, slurries, and colloids of food and

agricultural materials in operations such as food processing that require cleanliness. There arefour basic types of sanitary pumps: centrifugal, positive displacement, jet, and airlift.Syringe Pumps Infusion or withdrawal syringe pumps provide high pressure and high accuracy for applicationssuch as high performance liquid chromatography (HPLC). Used to deliver precise amounts of fluid at specific time intervals.

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