Microtunneling - 20 MSSP (Boston)



Derrick 20’ Modular Separation Plant

A contractor based out of New Jersey is using a Derrick 20’ Modular Separation Plant to work in conjunction with a Herrenknecht AVN1200 Microtunneling machine with outer diameter of 66’’.

Primary separation on the separation plant is accomplished in 2 stages by a Cascade 2000 machine composed of: a Belt Scalper, for coarse solids and sticky gumbo clay removal, that is mounted over a FLC-2000 high G screening machine that offers over 7.0 G’s of consistent acceleration. The combination of the belt scalper mounted over a shaker allows the contractor to convey out large, consolidated clay chunks and other oversize material +5 mesh and above. Additional oversize material is removed by the high G screening machine mounted below.

Underflow from the primary stage flows into the 1st chamber of the base tank and is pumped at 35-40 PSI to eight (8) 6” desilter cones that make a fine separation at approximately 30 microns. The centrifugal separation extracts the ultra fine sands and silts greater than 30 microns and discharges them out the underflow. The recovered fines from the hydrocyclones are further dewatered on another FLC-2000 screening machine that is typically outfitted with Derrick’s patented PyramidTM Screen panels with a corrugated, 3D profile. These screens offer 57% more screen area than conventional flat screens giving the machine an exceptionally high capacity per square foot.

Overflow from the hydrocyclones reports to the 2nd chamber of the base tank where it eventually overflows to the 3rd chamber of the tank. A portion of this material is then fed via a positive displacement feed pump to a Derrick DE-1000 hydraulically driven centrifuge for separating out fine silt and clay particles down to 3-5 microns. Centrifuge effluent is returned to the active system and re-circulated back through the MTBM. In clay formations especially, this allows the contractor to keep their mud weights in acceptable levels to return to the MTBM for maximum production rates.

The 20’ Modular Separation System with a versatile Platform Strategy for various civil engineering applications is an integrated base tank with centrifugal pumps for feeding hydrocyclones and accommodates a multitude of equipment configurations to meet the given ground conditions on a particular project. Up to three equipment platforms can be mounted on the 20’ base tank providing continuous production. Flexible platform configurations such as an FLC 2000 4-panel Shaker, a FLC 2000 4-panel Mud Cleaner with 6’’ cones, or a DE-1000 Full Hydraulic Drive Centrifuge provide optimal slurry separation. FLC-2000 machines feature Super G® vibrating motors for continuous high G-force linear motion and hydraulic Adjustable While Drilling (AWD) mechanisms achieve maximum solids conveyance. Derrick’s patented, performance enhancing polyurethane screen surfaces or corrugated Pyramid Screen technology, offering 57% more screening area, result in the most efficient solids removal.



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