Used Derrick DE-1000 FHD Decanter Centrifuge
The (Full Hydraulic Drive) can handle a wide variety of applications. This unit is designed for centrifuge duties where the feed characteristics are either unknown or variable. Proven in the field, this machine has processed twenty pound per gallon weighted oil field mud as well as flocculated ultrafine solids slurries. The bowl assembly is capable of rotating at any speed from 0 to 3400 RPM, producing an internal centrifugal acceleration in excess of 2300 G’s.
The DE-1000 FHD is installed on a rugged portable skid that includes a two point effluent discharge for easy setup. All rotating assembly components are manufactured from corrosion resistant 316 grade and high strength stainless steel alloy materials. Liquid and solid bowl heads are machined from forgings while the bowl and conveyor hubs are constructed from centrifugally cast stock. The drive system uses a 50 horsepower explosion-proof motor to drive the bowl via a hydrostatic pump/motor, and the conveyor with a Rotodiff by Viscotherm AG. On high specific gravity solids loading applications, the Rotodiff may apply up to 45 horsepower to drive the conveyor. On high solids volume and high speed applications, the hydrostatic motor may also require up to 45 horsepower to drive the bowl. The large fan-cooled radiator is corrosion resistant to allow trouble-free operation in hot corrosive environments.
The control panel is designed for ease of operation. The panel has one speed control each for the bowl and conveyor. A tachometer and a flow meter display the speed of the bowl and the differential speed of the conveyor, respectively. Pressure gauges are included to sense the torque (“loading”) of both the bowl drive and the conveyor.
The FHD is nearly impossible to “pack off.” The unit senses excessive torque and temporarily shuts off the feed pump. If torque continues to increase, the unit automatically “boosts” the conveyor speed to clear solids. Once the torque drops to a “safe” level, the feed pump automatically restarts. If the conveyor becomes jammed with an oversized object, the unit automatically shuts down and turns off. The hydraulic system is protected with overload pressure relief valves. As an additional safety precaution, all units are wired with a vibration shut down switch and a low level/high temperature oil shut down switch. The speed of the bowl can be adjusted while the unit is operating from 0 to 3400 RPM. Independently, the conveyor can also be adjusted while the machine is operating from 3 to 90 differential RPM from the bowl.
The versatile DE-1000 FHD with an axial flow conveyor is ideally suited for environ- mental processing. The speed controls allow the operator to fine tune the machine for the desired output. This can be critical when using flocculants as it permits the operator to set the speed as high as possible without shearing the flocculant. The axial flow conveyor diverts the feed to protect the fragile separated solids in the feed zone. The conveyor design, coupled with variable speed control, significantly reduces the internal turbulence thus improving the separation efficiency inside the bowl. With low specific gravity solids, these features can reduce both time and flocculant costs.