How to clean the screw conveyor The casing of the tubular screw conveyor is a steel tube, so there are two ways to clean it up: flushing with water or ventilating. Water injection finishing refers to a large amount of water flushing the pipe through the feed inlet to flush out the remaining materials. Ventilation is to use an air pump or a fan to pass a large amount of air into the pipe and blow the material out of the pipe. Both of these methods can easily clean up the materials in the tube.