Author: gnadmin

Recently GN solids control shipped mud mixing system to trenchless engineering company, the technical configuration is as below:

One transfer pump installed on one side of the mixing tank to transfer the mixed drilling mud to other place. The mixing hopper and mixing pump installed on the other side of the mixing tank with proper pipeline fittings, the man hole, clean gate, handrails and stairs are equipped on the mixing tank. The centrifugal pump head is interchangeable with famous brand centrifugal pump, the pump casing and impeller are made of hard ductile iron for better abrasion resistance.

The other mixing tank is consist of mixing hopper, and 2 shear mixing pump with its individual control panel, another transfer pump is on another side of the mixing system to transfer the mud. The pump can cut the chemicals into small pieces for better mixing performance of the chemicals, 2 each round chemical mixing tank are located in the mixing skid, with mud agitator on top of the mixing tank and liquid level meter, pipelines, valves, etc. accessories are attached. The painting and coating color is customized as per client’s requirement.

Except for mud mixing system, GN solids control can also produce dewatering centrifuge package to separate fine solids and get water recovery. The dewatering unit consists of one unit of dewatering centrifuge, 1 unit of centrifuge feeding pump, 1 unit of chemical dosing unit, 1 unit of catching tank. GN desander unit for TBM, piling engineering company should be used before the dewatering centrifuge, desander unit including 1ea double deck shale shaker and hydrocyclones ( desander or desilter), feeding pump, transfer pump and catching tank, the function is to separate coarse solids from the slurry, the fluids can be reused or treated by the dewatering centrifuge unit to get clear water.

1 unit of GNSD-90 disc stack separator and 1 unit of GNLW-454ET decanter centrifuge are shipped to our domestic client. These equipments are for separation of oil ,water and solids.
The working process is as below:

The decanter centrifuge feed pump transfer the oil sludge to decanter centrifuge feed tube, in the meanwhile, the dewatering unit mixed the proper chemicals, the chemical dosing pump transfer the chemicals to static mixer and then to decanter centrifuge feed tube, the mixing oil sludge and chemicals are mixed well, so it will be easily to be separated out by decanter centrifuge, the solids size bigger than 2 microns will be separated out, the oil and water mixture fluids will flow to buffer tank, then feed to disc stack separator, to separate oil, water and little solids. The mixture fluids feed to disc centrifuge must be with solids content less than 3%, otherwise it will block the disc stack separator easily.
The technical specification is as below:
GNLW-454ET decanter centrifuge with bowl diameter 18 inch(450mm) , bowl length 74.5 inch (1890mm), max speed is 3500rpm, max G force is 3084G, bowl L/R ratio is 4.2, the main motor and back drive motor will be suggested by our engineer according to client’s material. The handling capacity will be also depend on the chemical to be used and treated material.

GNSD-90 disc stack separator for oil, water, solids separation:
Bowl diameter is 580mm, slide piston is 500mm, the max speed is 6150rpm, max G force is 12273G, motor power is 18.5KW, the starting time is 10 to 15 minutes, the major components of the disc stack separator is the bowl, the process effect is obtained by the rotating drum with high speed.
Except for decanter centrifuge and disc stack separator, to treat oil sludge, the user also need other accessories, pls contact with GN solids control for more information.

Recently GN solids control shipped 3 package of dewatering centrifuge unit to Europe client, the configuration is as below:

3 sets of GNLW224EP-VFD decanter centrifuge
3 sets of dewatering unit
3 sets of centrifuge feeding pump ( positive displacement pump) installed on the fluids collection tank.
The working principal of 1 package of dewatering centrifuge unit is as below:

The screw pump feed the fluids to VFD decanter centrifuge, in the meanwhile, the chemical is mixed by dewatering unit and the chemical dosing pump transfer the chemical to decanter centrifuge feed tube, so the solids can be separated out easily with chemical mixing and collected by cuttings box, the fluids will drop down into the fluids collection box for reuse or send to further waste water treatment. The discharged water is clear enough since most ultra fine solids are separated out.
GNLW224EP-VFD decanter centrifuge is a 9 inch bowl mini decanter centrifuge with bowl length 36.4 inch, the bowl length is longer than GNLW223 series centrifuge with longer clarification segment, the discharged water will be more clear with the longer bowl cone. The max bowl speed is 5000rpm, typical bowl speed is 0 ~ 4500 rpm, with max G force is 3077G, typical G force is 2492G, the main motor is 11KW, back drive motor power is 5.5KW, the gearbox ratio is 95:1, gearbox torque is 1400 N.M.

The VFD control panel controlled the main motor, back drive motor and feed pump motor frequency, the Germany Netzsch brand screw pump work steadily to the decanter centrifuge, the fluids touch part is wear resistance alloy iron.
Except for 9 inch bowl decanter centrifuge, we also provide dewatering centrifuge package with other size decanter centrifuge, including 14 inch bowl, 18 inch bowl, 22 inch bowl, 30 inch bowl with different model dewatering unit and feed pump.

Recently 2 sets of drilling waste management equipments are shipped to Africa, including 2 units of vertical cuttings dryer, 2 sets of waste treatment decanter centrifuge, 2 units of screw pump, 6 units of screw conveyor,
The standard drilling waste management system configuration is as below:

1 ea vertical cuttings dryer
1 ea VFD decanter centrifuge
1 ea screw pump as centrifuge feeding pump
1 ea vertical cuttings dryer flushing pump
1 set of cuttings dryer skid and 1 set of decanter centrifuge telescopic skid
1 set of intermediate tank to collect discharged fluids from vertical cuttings dryer

Several units of screw conveyor to transfer the drilling waste to vertical cutting dryer top open feeder port. One unit is horizontally installed to collect drilling waste, one unit is slantly installed to collect drilling waste from the first unit screw conveyor discharge port. The complete package of drilling waste management system is designed as standard container loading size and for convenient transportation.
The vertical cuttings dryer is ideal equipment to treat the oil based drilling waste, the discharged solids with oil content on the cuttings is below 5%, if the discharged solids with higher moisture, the user should check the screen basket status through watching port, if the accumulated solids is already blocking the screen opening, it should be flushed by the high pressure air knife regularly, otherwise the treated solids will be with high moisture, the main motor will be continuously stopped because of over currency.

The VFD decanter centrifuge can separate the fine solids from the vertical cuttings dryer discharged fluids, the cut point is 2 ~5 microns, by adjusting the pump frequency, the user can adjust the feeding rate conveniently. The positive pressured VFD control panel with stainless steel cover, PLC smart control, HMI interface, world famous brand universal VFD inverter.

One set of waste water decanter centrifuge with chemical dosing unit to Middle East for waste water treatment project. The technical configuration is as below:

1 set of GNLW454-VFD decanter centrifuge, the centrifuge bowl diameter is 450mm, centrifuge bowl length is 1890mm, designed capacity is 400gpm, max bowl speed is 3500rpm, normal working speed is 0 ~3200rpm, max G force is 3084G, the mechanical separation cut point is 2 ~5 microns, the differential speed is 0 ~ 45 rpm, gearbox torque is 7500N.M., with gearbox ratio is 57:1, the main motor power is 55KW, back drive motor is 22KW, pump motor is 15KW. The bowl material is made of duplex stainless steel 2205 or 2304, the other bowl is made of stainless steel 316L.the bearing is SKF brand, the screw propeller is protected by tungsten carbide tiles. The solids discharge port and fluids distribution port is protected by tungsten carbide alloy.

The VFD control panel drive the decanter centrifuge main motor, back drive motor and pump motor. The pump flow rate can be controlled by adjust pump motor frequency. Except for GNLW454-VFD decanter centrifuge, we also produce 18 inch bowl decanter centrifuge with shorter length as GNLW453-VFD, which can be used for drilling fluids treatment, drilling waste management, oil sludge treatment and other kind of slurry separation. The other decanter centrifuge models including 9 inch bowl centrifuge GNLW223D, GNLW224-VFD; 14 inch bowl centrifuge GNLW363-VFD, GNLW364-VFD; 22 inch bowl centrifuge GNLW553-VFD, GNLW554-VFD; 30 inch bowl centrifuge GNLW764-VFD, etc. We can also provide customized dewatering centrifuge solution for their special requirement.

1 set of chemical dosing unit, including 3 compartment tank , hopper, agitator, level meter, auger conveyor, piping system, PLC smart control, 2 units of chemical dosing pump, pressure gauge, valves, skid, etc.
1 set of screw pump as centrifuge feeding pump