Jet pumps are typically inserted vertically into the process media, but can be mounted horizontally as well. Steel alloys, including stainless steel, are stronger and more abrasion resistant than plastics and provide good corrosion and chemical resistance.Ĭast iron provides high strength and abrasion resistance.įor more on materials and other pump features, visit IEEE GlobalSpec's Pump Features page. Plastics, including polypropylene (PP), polyvinyl chloride (PVC), acrylic, and polytetrafluoroethylene (PTFE), are less expensive and provide resistance to corrosion and a broad range of chemicals. For more information on different types of centrifugal pumps, visit How to Select Centrifugal Pumps on IEEE GlobalSpec. The centrifugal pump generates the force which circulates the motive fluid through the ejector, typically using an impeller powered by a motor. Jet pumps consist of three sections: a centrifugal pump, a jet ejector package, and a foot valve. This video provides visual explanation of a jet a pump's operation: This picture is a diagram of the ejector portion of a jet pump: This creates a low pressure (vacuum) at the throat, drawing the target fluid (from a well or other source) up into the nozzle. At the throat of the converging section of the ejector, the pressurized fluid is ejected at high velocity. After the pump is primed, a motive fluid is pumped through a standard centrifugal pump and enters an ejector. They function based upon the Venturi effect of Bernoulli's principle - utilizing constriction to reduce pressure and provide suction. Jet pumps are centrifugal pumps with an ejector (venturi nozzle) attached at the discharge outlet. Jet pumps are less efficient than typical centrifugal pumps due to such factors as friction loss, but may be more efficient when working with combined media that includes gases, and in variable well conditions where the surface characteristics involve turbulence. The combination of intake 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. Multiple inlets are used to draw in a constant stream of fluid, using pressure to create lift through suction. They can be considered mixers or circulators, since the intake combines multiple fluid sources. Jet pumps, also known as ejector pumps, are devices capable of handling and transporting all forms of motive fluid including gas, steam, or liquid.
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