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Desander is the 2nd phase of separation in drilling fluids circulation system for drilling rig. It is a completely mechanical equipment, do not consist of any electric or hydraulic drive. 
The most common desander produced by GN solids control is composed of 2 desander cone, 1 bracket, solids discharge trough. Desander can be assembled by different qty hydrocyclones, e.g. 1pc cone with 500gpm processing rate, 2pcs cones with 1000gallons/min processing rate, 3pcs cones with 1500gpm process rate.
Except for desander, the 1st phase of separation is shale shaker, the 3rd phase of separation is desilter, the 4th phase of separation is decanter centrifuge. The structure of desilter is similar with desander, just replace the 10” desander cone with 4” desilter cone.