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Jacoby Tarbox Eductors Guide | Eductors Online
What are Eductors, Tank Liquid Agitators, Jet-Pumps
Understanding applications for Eductors.
(c) 2007 Jacoby-Tarbox, a division of the Clark-Reliance Corporation
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Eductors? What are eductors?
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The purpose of this guide is to provide an overview of Eductors which are also referred to as Jet-Pumps) and Tank Liquid Agitators. Jacoby-Tarbox is a leader in Eductor manufacturing and design with experience in engineering solutions for all applications where an eductor is required within process lines or in tank solutions.
What is an “Eductor” ? A device that uses the energy from one fluid to create a pressure differential in a confined space. This pressure differential allows a second fluid to flow toward this lower pressure area or simply to be pumped. Either “fluid” may be a liquid, gas, or steam.
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Elements of a Reliable Eductor
• Smooth flow paths designed to maximize
efficiency
• Scaled geometry relating size 1/2” to 12”
• Consistent design and quality relates to
product performing as calculated.
• Mechanical integrity to eliminate additional
variables that may adversely affect
performance. (Full ASME Rating) |
Applications:
Eductors are used in a wide variety of applications:
• Remove water from gas wells as deep as 220’
[liquid pumping liquid application (L-L)]
• Add / Remove contents to / from railroad tank cars
[L-L, liquid or gas pumping gas (L-G), (G-G)]
• Add gasses to purify process(H2Otreatment) [L-G}
• Evacuate refrigeration system before
start-up [G-G]
• Add / remove water to bilge tanks shipboard [L-L]
• Remove rain water/silt from sumps w/ steam or water
[L-L] |
How to size an Eductor (Jet pump) For assistance in Eductor sizing contact our sales offices |
Sizing Eductors(Jet Pumps): Key Elements (Pressure)
Pressure boundaries are the most important items to obtain first.
Examples: How much pressure do I have at the eductor? How far do I have to lift the fluid? How far does the fluid have to travel after leaving the eductor? What vacuum do I need to reach, maintain? What devices are after the eductor? |
| Sizing: Key Elements (Capacity) Next most important are the required capacities. Suction capacity is an absolute must. Motive capacity is a must only if it is a limiting factor. Capacity may be in the form of time required / desired to evacuate a vessel and hold a certain pressure. |
| Sizing: Key Elements (Heating) The one notable application that is more concerned with temperature than capacity, though it may still be a limiting factor, is heating. Starting temperature, BTU’s available, and desired temperature are the key elements to consider. |
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Special Units |
Specific Sanitary Units |
- More optional connections available with
little modification than any brand unit.
- Standard eductors machined and polished for
sanitary applications.
- Important: Same known geometry is used
with all optional connection units, including
sanitary.
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- Accelerate line drying after cleaning.
- Create a vacuum in lines to aid evaporation and
evacuation of cleaning fluids or excess moisture,
decreasing line downtime. [L-G / G-G]
- Add culinary quality steam and cook quickly and
efficiently “in-line”. [H]
- Eliminate costly sanitary metering valves by
incorporating additives directly “in-line”. [L-L/L-G/L-S]
- Efficiently transport materials with existing line
pressures or air instead of purchasing a new sanitary
pump. [L-L / L-G / L-S / G-G / G-S / G-L]
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Key Terms: (Motive)
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- Motive: The operating or pumping fluid.
The smallest connection on the eductor.
- Motive Pressure: Fluid pressure at the
Eductor. Typically between 20 and 250
psig.
- Sources: Pumped liquid, city water supply,
static head (water tower), air compressor,
blower, steam, and waste steam.
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| Key Terms: (Suction) |
- Suction: The secondary fluid that will be
pumped or evacuated. Size matches the
size of the unit.
- Suction Lift / Pressure : When pumping
liquids, the distance a fluid needs to be
raised is the lift. When pumping gases, a
suction pressure is given, often in inches of
Mercury. Values may not exceed 27’ of lift
or 27” of Mercury vac.
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| Key Terms: (Outlet) |
- Size matches the size of the unit.
- Outlet Head / Pressure: When pumping
liquids, the distance a fluid needs to be
moved above the eductor is the outlet head.
When pumping gases, an outlet pressure is
given, often in psig. Only in rare instances
will the outlet be greater than 50% (25%) of
the motive pressure when pumping liquids
(gases).
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| For additional information regarding eductor applications contact our sales offices. |
In-Tank (Mixing) Eductor |
TLA (Tank Liquid Agitator)
- designed for in-tank applications
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Applications:
- Mixing
- Blending
- Solid suspension
- Heating (Sparging) |
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The Tank Liquid Agitiator or Tank Mixing Eductor is an eductor that operates on all the
same principles an the in-line eductor unit.
• The difference lies in the suction, which is
open to the tank fluid in which the unit is
submerged instead of being a connection.
• Primary use: mixing, the tank liquid agitator (mixing eductor) acts as a “pump
application device”
• Tank Lliquid Agitator “pulls in” 4 gallons of liquid for every
gallon of liquid supplied
• Tank volume equivalent “moved” through the
eductor in 20% the time of a nozzle alone. |
For more information regarding Eductors or Sizing Eductors for your applications contact our local sales offices worldwide. |
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