Eductors, also known as jet pumps or venturi pumps, are devices that use fluid flow to move another fluid or a solid substance. They work by converting the pressure energy of one fluid into velocity energy, which can then be used to pump another fluid or transport a solid.
Eductors have no moving parts, making them simple, reliable, and low-maintenance. They are also very versatile and can be used in a wide range of applications, including:
- Mixing: Eductors can be used to mix two or more fluids together, such as water and chemicals, or liquids and solids.
- Pumping: Eductors can be used to pump fluids from one location to another, even if the fluids are at different pressures.
- Transporting solids: Eductors can be used to transport solids, such as sand or gravel, in a liquid stream.
- Creating vacuum: Eductors can be used to create vacuum, which can be used for tasks such as evacuating tanks or vessels, or degassing fluids.
Eductors are used in a wide range of industries, including:
- Water and wastewater treatment: Eductors are used to mix chemicals into water and wastewater, and to pump fluids from one location to another.
- Oil and gas: Eductors are used to mix chemicals into drilling fluids, and to pump fluids from wells.
- Mining: Eductors are used to mix chemicals into slurry, and to transport solids in a liquid stream.
- Food and beverage: Eductors are used to mix ingredients together, and to pump fluids from one location to another.
- Chemical manufacturing: Eductors are used to mix chemicals together, and to pump fluids from one location to another.
Here are some examples of specific applications where eductors are used:
- Firefighting foam eductors: Eductors are used to mix foam concentrate into water to create firefighting foam.
- Tank mixing eductors: Eductors are used to mix liquids in tanks and vessels.
- Ejectors: Eductors are used to eject water from sumps and pits.
- Sand and mud eductors: Eductors are used to remove sand and mud from pipes and tanks.
- Steam jet eductors: Eductors are used to pump fluids using steam.
Eductors are a versatile and reliable technology that can be used in a wide range of applications. They are simple to operate and maintain, and can be used to mix, pump, transport, and create vacuum.
NCI (uniquely) has more than 50 years of experience with jet pumps and in tank mixing applications. Our tank mixing experience covers both tank mixing eductors and propeller type side entry mixers involving tanks in sizes up to one million barrel (42 million gallons) capacity. Put your trust into the Northeast Controls jet pumps group for a job done right the first time.
related: pumping gases
Jet Pumps all have three connections:
MOTIVE Connection: This connection is where the power for the eductor is generated, by increasing the velocity of the motive fluid. The eductor nozzle in this section takes advantage of the physical properties of the motive fluid. Eductors with liquid motives use a converging nozzle as liquids are not generally compressible. Eductors with gas motives utilize converging-diverging nozzles to achieve maximum benefit from the compressibility of the gas. All nozzles for eductors have smooth flow paths. Flow paths with sudden steps or roughness on these high velocity surfaces cause jet pumps to operate less efficiently.
SUCTION Connection: This connection of the eductor is where the pumping action of the eductor takes place. The motive fluid passes through the suction chamber, entraining the suction fluid as it passes. The friction between the fluids causes the chamber to be evacuated. This allows pressure in the suction vessel to push additional fluid into the suction connection of the jet pump. The high velocity of the motive stream in this section of the eductor directs the combined fluids toward the outlet section of the eductor.
Discharge Connection: As the motive fluid entrains the suction fluid, part of the kinetic energy of the motive fluid is imparted to the suction fluid. This allows the resulting mixture to discharge at an intermediate pressure. The percentage of the motive pressure that can be recovered is dependent upon the ratio of motive flow to suction flow and the amount of suction pressure pulled on the suction port. The mixture then passes through the diverging taper that converts the kinetic energy back to pressure. The combined fluid then leaves the outlet.
General Performance Table
Liquid Jet Pump TableUsing Liquid as Operating Medium
|Discharge Head Level - Model
|Low - SL / LL
|Med - ML / LM
|High - HL / LH
|Operating Medium Pressure Range
|Nom Operating Med Pressure PSIG/ft of Discharge Head
|2.0 PSIG (SP.GR. 1.0)
|1.5 PSIG (SP.GR. 1.0)
|1.0 PSIG (SP.GR. 1.0)
|Discharge Head Pressure Range
|to 50 FT.
|40 to 80 FT.
|80 FT. or more
|to 27 FT.
|to 27 FT.
|to 27 FT.
Total customer satisfaction comes from the combination of quality products purchased at a reasonable price and delivery quickly and when promised.
Jet Pumps are in stock from 1/2″ up to 3″ sizes. Jet Pumps are stocked in Carbon Steel, 316SS and Bronze. Tanks Eductors are stocked in sizes from 3/8″ up to 3″ in both Carbon Steel and 316SS. We also stock tank eductors in Polypropylene & PVDF (KYNAR) materials in sizes from 1/4″ thru 1-1/2″.
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