1. power wash: use pneumatic or electric brush to brush dirt, then dirt is sucked into the vacuum collector with the same method and direction as gas washing. This method requires as much care as possible to avoid damaging the surface of the insulation.
2. gas flushing: this method delivers compressed air by means of a hose with a nozzle attached to the air pipe. The design nozzle allows compressed air to expel dirt and dirt. Dirt and dust which are compressed air to dry are carried along the duct into the vacuum vessel.
3. vacuum suction: operated with a vacuum suction pipe like hand type. Direct contact with the wall of a pipe with a brush to remove dirt.
This method requires larger manholes to allow the operator to get as much of it as possible. But this method is most likely to miss out on a fraction of dust and dirt because the duct does not form complete negative pressure conditions. The following methods can form negative pressure conditions.
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