How to Mix a Chemical Tank
Without Moving Parts

Mechanical agitators — impellers, paddles, turbines — are the traditional answer for tank mixing. But they bring motors, shaft seals, bearings, and gearboxes into direct contact with your process fluid. In chemical service, that means corrosion, leaks, and maintenance downtime. There's a better way.

The Problem

Chemical tanks need mixing for blending, temperature equalization, preventing stratification, and keeping solids in suspension. Mechanical agitators work — but they introduce failure points directly into the process:

Shaft seals fail, causing leaks of hazardous or expensive chemicals
Bearings wear out, requiring scheduled maintenance and downtime
Motors and gearboxes add electrical infrastructure and heat
Impellers can be damaged by solids or viscous fluids
Cleaning and sterilization (CIP/SIP) is complicated by mechanical components

The Solution: Jet Mixing with Eductors

A tank mixing eductor uses the Venturi principle: a motive fluid (typically the tank contents, pumped externally) is forced through a converging nozzle at high velocity, creating a low-pressure zone that draws in surrounding fluid. The combined jet exits at high velocity, creating powerful circulation throughout the tank.

How It Works — Step by Step

1A centrifugal pump draws fluid from the tank and pressurizes it (typically 15–50 PSI motive pressure)
2Pressurized fluid enters the eductor nozzle, accelerating to high velocity
3The high-velocity jet creates suction, drawing in 3–5× its own volume of surrounding tank fluid
4The combined flow exits the eductor as a high-momentum jet, driving circulation
5Multiple eductors can be positioned to create full-tank turnover patterns

The result: complete tank mixing with zero moving parts inside the tank. The only moving component is the external pump — which is easy to maintain, isolate, and replace without entering the tank.

Eductor Mixing vs. Mechanical Agitation

Factor	Eductor Mixing	Mechanical Agitator
Moving parts in tank	None	Shaft, impeller, seal
Seal failure risk	None	High — shaft seal contacts process fluid
Maintenance access	External pump only	Requires tank entry
CIP / SIP compatibility	Excellent	Complicated by mechanical components
Corrosive fluid handling	Excellent — all wetted materials selectable	Limited by seal and bearing materials
Installation	Simple nozzle fitting	Structural support, motor mount required
Energy use	Moderate (pump + eductor efficiency)	Moderate (motor + gearbox losses)