When using a wet/dry vac truck to vacuum dry material, it’s important to understand not only what happens when you stick the end of the vacuum hose into the pile of material, but to also understand how the material flows through the truck. Once you begin vacuum operations, the air flow will pull the material through the hose and into the truck. As the air flow carries the material throughout the truck, the material will be filtered out so when air exits the truck, it will exit as clean air.
As the material flows through the vacuum hose and into the truck, it will first enter the truck through the debris body. Inside the debris body there is a deflector plate. The deflector place will knock most of the bulky, heavy material down into the bottom of the tank and the remaining material will carry into the cyclone chamber.
The air flow will carry the remaining material from the bottom to the top of the cyclone chamber. Inside the chamber is a metal cone that will cause the heavier, denser material to fall to the bottom of the chamber.
The air flow will then carry the remaining material across the top of the truck from the cyclone chamber to the bottom of the baghouse. The air will then move back to the top of the baghouse and the filter bags will catch any remaining material and dust. At the top of the baghouse you will see a metal cage that looks like a protective cover. If you look closer there are actually small holes that line up with each filter bag and cage. Air will flow through here and pop into the filter bags causing any collected dust to pop off and fall to the bottom of the bag house.
At this point, the material has been filtered out and the clean air will flow from the top of the baghouse down to the microstrainer. Finally the air will pass through the vacuum pump, into the silencer, and back into the atmosphere.
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