Microtunneling is one kind of trenchless construction.
It is mainly used in urban area. Drilling mud need to be recycling.
The recirculation slurry system used for microtunneling should be as conpact as possilbe and the footprint of the total system shoud be as smaller as possible.
For microtunneling recirculation slurry system, usually, all separation equipment are conbined together, for fast movement and compact.
the photo shows gn solids control mud system for zj50 oil rig in the oilfield.
Learn more: ZJ50 Rig Mud Cleaning System for CNPC LiaoHe Oilfield
LiaoHe Oilfield, a 
company, which is the largest production base for thickened oil and high pour point oil in China has already procured 5 unit complete mud cleaning system from GN. The latest ZJ50 rig mud cleaning system has been already running well on the jobsite after our technicist making the commissioning.
GNZJ50 (5000HP) rig system running well in a CNPC jobsit.
It is a 6-tank mud system including following:
1. 3 units Shale Shaker each capacity of 140m3/hr
2. 1 unit Vaccum Degasser GNCQ360 which remove the cuttings in gas from the drilling mud to improve the efficiency of transfer pump.
3. 1 each Desander and 1 each Desilter
4. 1 unit High Speed Decanter Centrifuge GNLW363
5. Agitators to prevent the drilling mud sedimentation
6. Centrifugal Pump for transfering mud internal tank and charging to mud pump.
7. This ZJ50 rig mud cleaning system also equiped with poor boy degasser to prevent blowout.
The drilling desilter is the 3rd phase solids control equipment.Before the drilling desilter, there is a Desander, before desander, it is the primary shale shakers. 
The drilling desilter separate the fine solids around 20-30 microns, and the even smalleer solids for the drilling mud, we have to use the decanter centrifuge to do the solids separation.
GN Solids Control Co.,Ltd is the closest Solids Control Equipment factory to Beijing,China.
