Process mixing within tanks is typically done using rotating blade electric mixers. An alternative to this uses a recirculation pump with eductors. In certain applications, eductors are a more appropriate method to mix tanks.
The venturi effect creates a low pressure zone within a nozzle when flow cross-section is reduced. This low pressure area is used to draw surrounding fluid into the nozzle for a mixing effect. Eductor nozzles are installed on a manifold within a tank and connected to an external (or internal) circulation pump. The venturi effect typically induces the addition of four gallons of liquid to every one gallon of pressurized liquid that flows from the pump.
Rather than using a rotating mixer with blades, a pump and eductor system can be used to mix liquids in odd-sized tanks. Another advantage of educators is their availability in a variety of thermoplastic materials so they can be used with corrosive liquids. Eductors are available in polypropylene, CPVC or PVDF. They can also be sourced in stainless steel or iron.
Recirculation manifolds are also a convenient location for chemical injection ports. So if you are adding chemicals to an existing tank you can inject and mix them easily. Another advantage of eductor mixing is that the incorporation of 3-way valves in the recirculation system allows you to pump the fluid to a remote destination after the mixing is complete.
Recirculation manifolds are also a convenient location for chemical injection ports. So if you are adding chemicals to an existing tank you can inject and mix them easily. Another advantage of eductor mixing is that the incorporation of 3-way valves in the recirculation system allows you to pump the fluid to a remote destination after the mixing is complete.
