CNQ desilter is the three-level equipment in the mud cleaning system, to deal with the solid particle with diameter of 15-44μm in the drilling fluid to guarantee a good dispose by the next procedure. CNQ desilter is made up by swirler (4” or 5”) and drip screen. The type of the swirler and drip screen can be made according to the customers’ requirement.This is a most important part in the oil drilling, pipeline crossing and sludge treatment systems.