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How does the Vac-Ex Technique work?

Breaking the ground 

Compressed air either supplied on-board the unit or externally is directed through an insulated AIR-EX lance and is used to initially loosen, agitate, or aerate the ground. This loosened debris is then safely removed by vacuum. Should Air not break the ground due to difficult ground conditions, hydro-excavation may need to be implemented.  
 

Breaking difficult ground

If the ground is found to be more stubborn and AIR-EX use doesn’t seem effective, high pressure water is a good alternative agitator to safely work around underground plant and equipment. The resultant materials can then be removed using Vac-Ex.
Of course the use of traditional shovels can be utilised alongside the Vacuum however we recommend all precautions are taken to prevent potential damage to underground services.
 

Removing the ground 

The Vac-Ex unit generates a large amount of Air Flow & Vacuum through their Vacuum Generators. These can either be Turbines, or Lobe or Venturi pumps. Air and debris enters the pipe inlet and travels through the Vacuum pipe into the Debris Chamber / Container.  The Pressure drop inside the Container allows any air-borne particles to fall from the air stream. This partially clean air travels through a series of baffles which further separate debris and dust. The ‘clean’ air is then fine filtered to 5 microns before being expelled through the Vacuum Pump to the atmosphere.
 

Transportation & Disposal

The Vac-Ex systems are sealed units therefore enabling the material to be transported without the risk of spillages or cross contamination. Depending on the machine of choice the resultant material can then be tipped to ground, bulk bag, wheelbarrow, skip and stockpile or into a controlled environment.
 

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