FAQs on Eductors for Tank Mixing
What is an eductor, and how does it work?
An eductor is a nozzle-based mixing device that uses the Venturi effect to create a vacuum, entraining and circulating surrounding fluid. It amplifies flow rates, improving mixing, agitation, and chemical blending in industrial applications.
What are the advantages of using eductors over mechanical agitators?
• No moving parts – Minimal maintenance & longer lifespan
• Energy-efficient – Uses existing fluid pressure, reducing energy consumption
• Cost-effective – Lower initial and operational costs compared to motorized agitators
• Uniform mixing – Prevents sedimentation, ensuring homogeneity
• Versatile applications – Used in chemical processing, wastewater treatment, and food industries
In which industries are eductors used?
Eductors are widely used in:
• Chemical processing – Mixing solvents, acids, and industrial chemicals
• Wastewater treatment – Preventing sludge buildup and improving aeration
• Food & beverage processing – Ensuring uniform blending of ingredients
• Pharmaceuticals – Mixing drug formulations and biological solutions
• Metal finishing – Enhancing electroplating and anodizing efficiency
How much fluid can an eductor circulate?
Depending on the model and operating pressure, an eductor can move 4 to 5 times the volume of the pumped liquid, ensuring efficient fluid mixing with lower energy consumption.
How should eductors be positioned for maximum efficiency?
• Placed low in the tank and angled upward for full mixing coverage
• Angled downward if sediment clearing is needed
• Multiple eductors may be required to ensure complete fluid circulation without dead zones
How much circulation can an eductor produce?
Depending on model and motive pressure, eductors can entrain and circulate multiple times the pumped (motive) flow. Actual circulation depends on nozzle size, pressure, piping losses, and tank layout.
What pump pressure is required for an eductor mixing system?
Required pressure depends on the eductor design and desired circulation. The pump must provide enough pressure and flow after accounting for pipe/friction losses to achieve the target turnover and mixing performance.
Where should eductors be installed inside a tank?
Eductors are commonly mounted in the lower zone of the tank to sweep the bottom and drive full-tank circulation. Placement angle and direction are selected to reduce dead zones and improve turnover.
How do I select the right eductor size for my tank?
Selection is based on tank volume and geometry, fluid viscosity, solids content, mixing objective (blending vs suspension), and available pump pressure/flow. Larger tanks often require multiple eductors for full coverage.
What are common reasons an eductor doesn’t mix properly?
Typical causes include insufficient motive pressure, incorrect sizing, poor placement direction, clogged strainers/nozzles, or too few eductors for the tank geometry and internals.
What maintenance is required for eductors?
Eductors have no moving parts inside the tank, so maintenance is usually low. Routine checks include strainer/filter cleaning, inspecting for scaling or blockage, and verifying pump pressure and nozzle performance.