Tank mixing eductors are used to keep the contents of a tank mixed. They're typically connected to a recirculating pump and submersed in the contents of the tank. BEX eductors use a unique venturi design which enables smaller pumps to circulate large volumes of tank solution. The eductor will circulate 4 to 5 gallons of solution for each gallon pumped, resulting in quick, efficient mixing.
Some common uses for tank mixing eductors include:
This page is designed to help our customers determine the best way to set up eductors for any application. This includes deciding the type of eductor, how many to use, appropriate layout/orientation, pipe size and pump size. For basic troubleshooting, please see our troubleshooting guide.
For further assistance, please contact the BEX customer support team, and we will be happy to help you directly.
Eductors are an ideal solution for tank mixing applications. Unlike mechanical agitators or compressed gas, they do not rely on costly mechanical parts, which are difficult to repair. Unlike compressed gas injection, tank mixing eductors will not alter the chemistry of the tank contents.
The main problem with using a mechanical agitator is that they require multiple propellers, a shaft, and motor assemblies to be positioned in, or near, the tank. These assemblies take up a lot of space inside the tank, and in many cases, they can restrict or further complicate how a work piece can be positioned or moved inside the tank, especially when being lowered or raised. The mechanical components in an agitator system are also costly to repair, require frequent maintenance, and take a long time to install and replace.
Another common method of mixing the contents of a tank is to use compressed gas. Using compressed gas in a tank can drastically change the chemistry of the tank if the gas dissolves into or reacts with the tank liquid. The bubbles produced by compressed gas injection can entrain vapours from the tank liquid. When these bubbles break the surface they produce a mist of process liquid which can migrate from the tank, creating a mess around the outside of the tank. Depending on the process this mist can be harmful to people and corrosive to other equipment in the facility.
None of these problems are present in an eductor system. It is far easier to remove an eductor that requires repair or replacement than any other tank mixing system. Due to the relatively small size of eductors, they are easy to aim at trouble spots, and can be effective in a wide variety of tank mixing layouts. There are no moving parts in an eductor system, with the exception of the pump, which is located outside of the process tank. Most importantly, BEX eductors are manufactured in-house and incorporate a unique venturi design which increases the mixing and agitation in the tank. This means that the time required to achieve an acceptable mix is greatly reduced, which improves the efficiency of any coating, plating, or cleaning applications.
The unique venturi design of a BEX eductor enables smaller pumps to circulate larger volumes of tank solution. One eductor will circulate 4 to 5 gallons of solution for each gallon pumped with solutions that maintain a similar viscosity to water.
Those unfamiliar with how eductor systems work should be aware of the following:
Determining the best eductor orientation depends on the application. Each application has its own set of determinants for size, quantity and placement.
In order for an eductor system to work properly, it is vital that the necessary pump and piping be considered. Variables such as the power of the pump, the sizing and number of bends in the pipe, the size of the tank, the density of the liquid, and the distance between the eductor and the surface of the liquid, will all play a factor in how effective an eductor system is at reaching the desired rate of circulation in the tank. To help determine the required flowrate and pressure for what you want to accomplish, whether it be mixing, sweeping or agitation, one must work backwards from the eductor and determine the required pressure output of the pump.
