The desander should take suction from the degasser overflow tank and overflow to the adjacent downstream tank. Desilter suction should be from the desander overflow and again, overflow to the adjacent downstream tank.
Low level equalizers between the overflow and suction tanks ensure a backflow of mud as described above.Where the bottom of the cones lies several feet above the mud level in the tanks, the overflow line may create a vacuum which sucks solids through the overflows, thereby reducing separation efficiency. This can be overcome by installation of a vacuum break.Both desander and desilter shall installed on the mud tank.