Solution agitation is employed with the intent of causing a mechanical scouring action with sufficient mixing in order to provide and maintain solution homogeneity. This sounds very simple, but as in all real-world situations, things aren’t as simple as they first appear.
A complication with air agitation systems in metal finishing applications is encouraging toxic gassing of the solution to rise in the bath and burst at the solution surface. Gases
form at the plated surface during electroplating. Air rapidly moves gases to the solution surface where they burst creating an unwholesome environment for the tank operators often causing them to wear protective respirators.
Recent guidelines established by OSHA and the SCAQMD are addressing the need for change to prevent this conditioning from happening. The answer – Eductors
Eductors work on a venturi principal. A pump propels the primary solution under pressure at a high velocity through an eductor nozzle mounted inside a flow-through venturi bell, which induces a large secondary stream that is designed to prevent clogging and internal buildup and drastically reduce, or eliminate aeration. This means the eductor can pull in or “entrain” up to four additional gallons of surrounding solution for every gallon pumped through it.
The liquid pumped through the eductor can be channeled towards the plated surface where it flushes the surface with fresh solution thus preventing gases from reaching the surface.
The number of eductors to employ is dependent on tank turnovers, which we may define as the number of times the entire liquid contents of a tank are pumped through the eductor(s) per hour.
Eductor configurations and mounting patterns are unlimited. However, there are some general rules to consider including the supply manifolds which may be simplex, duplex or multiplex (more than two) Manifolds must be sufficient diameter to maintain low friction losses and manifold ends must be capped or plugged.
Materials of construction available include 316SS, Polypro, CPVC and PVDF
Eductor systems may be installed:
Directly onto the discharge line of a dedicated pump in parallel to the filter system
Filter systems should not be used to feed an eductor system due in large part to the diminished flow rate expected as the filter system build back pressure and reduces the flow.
PENGUIN EDUCTORS PENDUCTOR SYSTEMS are designed for in-tank mixing using the tank fluid as the mixing medium for solution agitation. Simple in design, these eductors systems are easy to install, operate, and maintain. Simplex systems consist of one (1) Eductors Penductor manifold assembly, hose clamps, and 10 feet of hose. Duplex systems consist of two (2) Penductor manifold assemblies, two (2) nipples, tee, hose clamps, and 10 feet of hose. Some assembly is required on both of these systems.
Eductors Penductors utilize the fluid inside the tank reservoir as the “motive” fluid, which is defined as the fluid flowing through the Penductor nozzle. The high velocity motive fluid entrains the liquid near the suction openings of the Penductor, and mixes this liquid thoroughly as it passes through the diffuser. The resulting plume of mixed fluid, flowing at an intermediate velocity, now proceeds to mix and agitate the remaining tank liquid.
To learn more, or discuss a custom solution for your project, please call us at 818.504.2391.