Outer tank: Power transfer, filtration, recycling, waste removal
Heavy-guage double walls insulate and transfer power
The outer tank is comprised of heavy-duty 10-guage stainless steel. An inner liner of sheet metal behind the transducers and tank bottom is attached to form a one-inch, 14-guage space between the outer and inner walls. This air pocket acts as an insulator to maintain the temperature of the heated liquid inside the tank—and it also acts as a trampoline to bounce the ultrasonic waves back into the tank to create even more energy (a single, solid wall would instead absorb this energy).
Three-sided walkway for inspection, cleaning, and repair
A three-sided yellow walkway has steps on both sides of the pump end of the unit for easy access. Workers can use this walkway to look into and to gain access into the tank for cleaning and repair, as well as to hand-guide parts being lowered into the tank for cleaning. They are recommended to attach themselves to emergency pull-chords that run along both sides of the walkway—pulling either chord immediately stops the entire cleaning process.
Junction boxes connect power generators to transducers
Electric junction boxes are mounted along the outer tank wall, below the walkway. They are color-coded to indicate how many waterproof cables are connected to them from the generators housed within the external power cabinet. Each cable connected to a box is also connected to an individual ultrasonic transducer inside the tank. The color coding offers easy identification for each box during reassembly on-site after a unit has been shipped.
Filter pumps strain waste, recirculate cleaned liquid
A pump and filtration system is located at the opposite end of the tank from the waste collection totes (below). The system pulls liquid from the opposite end through two pipes, one running along each side of the tank bottom. Each tank can filter up to 150 liters of liquid per minute.
A filter on the system’s intake acts as a strainer, with the liquid then going into either one of two 50-gallon filter tanks.
Operation begins with both tanks running together—but as debris clogging builds up pressure in either tank over time, that tank’s valve can be turned off, leaving the other tank to keep filtering while the operator replaces the clogged filter in the downed tank.
Each tank contains four 30-inch tubular filters, set vertically. These filters trap any sediment pulled in from the center area of the main tank, and can accumulate two cubic feet of solid waste media. The filtered water and detergent that passes through these filters recirculate into the tank through piping behind the steam plates, heated and cleaned.
Filtering center-tank sediments is vitally important, because this maximizes the cleaning efficiency of the ultrasonic waves, which in turn ensures the fastest possible cleaning times.
Twin totes collect waste and detach for easy haul-away
A pair of empty collection totes is attached to the tank before cleaning begins. These totes connect to the overflow weir at one end of the tank and can hold up to 270 gallons of liquid waste each. As liquid enters the totes during the cleaning process, loose debris and light oils float to the top. The non-waste water naturally sinks and separates below, and pumps back into the main tank area. As the waste layer expands and less water can be contained at the bottom, the operator can disconnect either tote independently and haul it away, fitting a new, empty collection tote in its place.