MSSP-1000 - Derrickinternational Equipment Company

PROCESS FLOW
MSSP-1000
Flow from the TBM passes through a flowmeter and then to a Derrick C-56 low-speed, high-amplitude
screening machine. The machine’s weir-style feeder distributes the slurry evenly on its urethane screen panels.
Oversized material that does not pass through the screen bed is directed to a conveyor and stacker for
deposit in a holding area. Solids and fluid that pass through the screen are directed by gravity to Sump 1 of
the base tank, which is located directly below the screening machine.
One abrasion-resistant pump draws slurry from the bottom of Sump 1 to feed 4 12” sand separator-type
hydrocyclones. Each hydrocyclone discharges oversized material onto the urethane screening panels of
a Derrick FLC-2000 screening machine. Undersize material and overflow fluid passing out the top of the
hydrocyclones is discharged into Sump 2. Oversized material from each of the FLC-2000s is discharged
to the belt conveyor. Fluid and solids that pass through the screens flow by gravity to Sump 2 for further
processing.
Two additional abrasion-resistant pumps have the capacity of drawing slurry from either the bottom of Sump
1 to feed 8 additional 12” hydrocyclones or from Sump 2 to feed 80 4” hydrocyclones. Oversized material
discharged from either the 12” sand separators or 4” hydrocyclones is further dried on 4 FLC-2000 screening
machines. Overflow from the top of the hydrocyclones is fed by gravity to the appropriate sump.
The three sumps in the base tank are separated by weirs for safe, gravity-flow operation. When the TBM is
operating at 100 percent capacity, fluid passes through the processing equipment and then to the base tank
sumps in sequential order. When the level in Sump 3 rises to the weir outlet, cleaned fluid flows by gravity to
the TBM working tank. If the TBM pump is delivering less than 100 percent of design flow, part of the slurry
in Sump 2 flows over the weir into Sump 1 instead of flowing out to the TBM tank. In addition, part of the
slurry in Sump 3 returns to Sump 2 instead of flowing out to the TBM tank. This feature maintains sufficient
fluid supply to the hydrocyclone feed pumps at all times.
The plant includes two Derrick DE-7200 decanter-type centrifuges, which receive slurry from either the active
working system or waste mud tank. Oversized material from the centrifuges is directed to the conveyor, while
cleaned fluid flows by gravity to the TBM tank or to a site discharge point. When a nearly clear effluent
discharge is desired, a completely automated dry polymer metering and mixing system can supply flocculent
to both DE-7200 centrifuges simultaneously.
Derrick Equipment Company – Modular Slurry Separation Plant
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