Eductor

example of eductorAn eductor is often referred to as a jet pump. Jet pumps utilize the kinetic energy of one liquid to cause the flow of another. They operate on the basic principles of flow dynamics. This involves taking a high pressure motive stream and accelerating it through a tapered nozzle to increase the velocity of the fluid (gas or liquid) that is put through the nozzle.

Typical Applications

Draining flooded areas, de-watering sand and coal barges, continuous blending, acidifying, causticizing of oils, pumping food products.

Eductors Specifications

There are three connections common to all venturi eductors.

Eductor MOTIVE Connection: This connection is where the power for the eductor is generated, by increasing the velocity of the motive fluid. The Jacoby-Tarbox 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 Jacoby-Tarbox eductor 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.

Eductor 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.

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.

The Process of Sizing a Liquid Motive Eductor

Take One for a Spin !

Eductor Sizing

  • Sizing an eductor is a relatively straight forward process.  The following information will help you begin the process.  If you wish to have us size an eductor(s) for your application please use one of the "Request Pricing" forms to contact us.

How to Size Liquid Eductors for Pumping Liquids

To determine the correct eductor for a specific application, follow the steps in this section, using the performance tables provided to achieve your desired results. (NOTE: All JT eductor tables use the 1-1/2 inch unit as the standard, and eductors are sized using a Sizing Factor (S.E.) based on this standard unit.)  read more ....

How to Size Liquid Eductors for Exhausting Gases

To determine the correct eductor for a specific application, follow the steps in this section, using the performance tables provided to achieve your desired results. (NOTE: All JT eductor tables use the 1-1/2 inch unit as the standard, and eductors are sized using a Sizing Factor (S.E.) based on this standard unit.)  read more ....

How to Size Liquid Eductors for Evacuating Gases

Net Positive Suction Head (NPSH) is one of the most used terms for pumps (including eductors) and also one of the least understood. Simply stated, NPSH is a method of evaluating a set of suction conditions for a pump. This formula takes into account variables for the particular liquid being pumped and the conditions under which it is being pumped. It corrects them to a set of standard conditions.  read more ....

How to Size Steam Eductors for Pumping Liquids


To determine the correct eductor for a specifiC application, follow the steps in this section, using the performance tables provided to achieve your desired results. (NOTE: All JT eductor tables use the 1-1/2 inch unit as the standard, and eductors are sized using a Sizing Factor (S.F.) based on this standard unit.)  read more ....

 
Jacoby Tarbox Pipeline Eductor General Performance Table
Description Model SL Model ML Model HL Model SG Model HG
Motive Media Liquid Liquid Liquid Steam Steam
Motive Pressure (PSIG) 15-250 15-250 15-250 30-150 20-150
Pressure Recovery % 10-15 30-35 40-50 15-20 30-35
Maximum Suction Lift -27ft. -27ft. -27ft. -20ft. -20ft.
Minimum Required NPSH 3ft. 3ft. 3ft. 13ft. 13ft.

 

 

 

Large Inventory

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 stock PPL & PVDF materials in sizes from 1/4" thru 1-1/2".

Pressure Ratings

While the competition design their eductors for nominal pressure ratings, JT Eductors are designed and produced to meet rigorous ASME/ANSI specifications.

We offer eductors and jet pumps with ratings about 30% higher than most competitor's products.

JT Eductors are rated at 316SS: 720 psig @ 100 F | Carbon Steel: 740 psig @ 100 F | Bronze: 500 psig @ 100 F