Desander unitis composed of a set of hydrocyclone and a small ultra fine mesh shale shaker is used to deal with vortex bottom mud flow and recovery. Generally desander unit, 300 mm hydrocyclone can satisfy separating particle size of 45 ~ 74 mu m design requirements of solid phased particles micro-tunneling industry.

1. According to the actual situation of drilling fluid circulation system for installation, desander unit shale shaker export should highlight the tank side of 20 to 30 mm, in addition to the sand cleaner base application four plate fixed on the tank, should check whether the tank surface is level before fixed and fight desander unit backward.
2. Desander unit should first check before each use by screw without looseness, vibration shaft rotation is flexible, if there is any abnormal sound or failure should be ruled out in time, ensure normal rear can use.
3. Desander normal pressure should be 200 kpa to 350 kpa, should according to the drilling fluid viscosity, specific gravity, specific circumstances, such as sand content will row sand mouth LiuKou (bottom) to adjust to the appropriate size. Bottom flow drilling fluid should be into umbrella jet eduction, appropriately increase the bottom flow can make the overflow particle size smaller, can achieve the goal of maximum removal of solid phase.
4. Bottom flow line of sand to adjust: hand according to the adjusting plate handle, push down 5 mm, rotated 90 ° (arbitrary direction) automatic reset after the hand, can be adjusted to the appropriate underflow diameter.
5. Shale shaker in the general case, the use of 1420 r/min, when the underflow high sand content, belt can be adjusted through, will speed switch to 1664 r/min.
6. Screen replacement: replacing sieve, should cut off power supply, loosen the lock nut at the ends of the drum shaft cover shape, along the axial tap nut locking bolt back, and then use the drum shaft special spanner rotating drum shaft, can make screen relaxation.