Recently one batch of equipments for trenchless engineering projects are ready for shipment, including 1 set of GNMS-500D desander unit, 1 set of GNMS-1000D desander unit, 3 ea mud tank, 1 ea jet mud mixer, 1 set of GNLW554E-VFD dewatering centrifuge.

The working process is as below:
The desander unit first separation coarse solids shaker screen to separate the coarse solids from drilling mud, the fluids drop into the intermediate tank which is very small, then the feeding pump installed on the desander unit will transfer the fluids to desander cone to separate the fine solids up to 45 microns. The clean fluids flow to storage tank. The dewatering centrifuge feeding pump pick up the fluids and transfer to the dewatering centrifuge for fine solids separation up to 2 microns. The clean fluids are recycled and storage in a mud tank, the jet mud mixer will mix the fluids with chemicals to prepare for new drilling, which can save money for the clients. The jet mud mixer is a skid mounted mud mixing unit with mixing hopper, mixing pump, pipelines, control panel and valves.

The dewatering centrifuge GNLW554E-VFD is a big bowl big volume decanter centrifuge, the bowl diameter is 22 inch, the bow length is 91 inch, the L/D ratio is 4.1, the designed capacity is 600gpm, the typical capacity is 480gpm, max speed is 3150rpm, max G force
Is 3051G, typical G force is 2412G. The main motor power is 90KW, the back drive motor power is 45KW, based on different solids content and solids size distribution, the operator can decide to use chemicals or not for better separation performance.

The mud tanks can be used as storage tank and mixing tank, each compartment with its agitator for better mixing, through pipelines the jet mud mixer can mix from any compartment.

2 mud tank mixing system are ready for shipment which will be used for trenchless engineering work. GN desander unit for TBM, Piling is the first phase separation and second phase separation system, we have 3 models of desander unit for option, GNMS-200D, GNMS-500D, GNMS-1000D with treating capacity 200gpm, 500gpm, 1000gpm. GNMS-200D desander unit separation cut point is 15 microns, GNMS-500D desander unit separation cut point is 40 microns.

After TBM desander unit, the fluids can be recovered, if the silt is accumulated too much in the fluids, dewatering centrifuge unit should be used to separate the ultra fine solids, by using proper chemicals, most of the solids bigger than 1 microns can be separated out, the customer can get clear water recovery and dry solids for easier disposal. The unit can be installed inside standard container with windows, doors for less noise and sun/water proof. For less cost, the chemical dosing unit can be also installed on the dewatering centrifuge tank.

To prepare for new drilling fluids, the mud mixing tank should be applied. We can design mud mixing system with different mixing capacity and different chemicals according to client’s requirement. Recently 2 mud tank mixing system are ready for shipment for trenchless engineering company. Their mud mixing system including 2 package of mixing tank, the first tank with 1 transfer pump, 1 mixing pump with 1 mixing hopper ( venturi type), all of them are installed on one mud tank skid with pipelines and accessories. The second mixing tank with 1 transfer pump, 2 mixing pump with 1 venturi type mixing hopper, and 2 chemical mixing tank with mud agitator on top for better agitating. Each mixing pump with 1 individual control panel, the chemicals should be provided by customer based on their requirement.

For more information, pls contact with GN sales engineer.

The disc stack separator and decanter centrifuge is the core equipments for oil sludge treatment system, a complete set of oil sludge treatment system including sludge vacuum pump, pre-mixing modular, coarse solids separation shaker modular, 3 phase separation modular. According to client’s requirement and the treated material condition, the user can select they required modular.

The 3 phase separation modular including decanter centrifuge with its feed pump, telescopic skid, disc centrifuge with its buffer tank, oil storage tank with oil pump, water storage tank with water pump, all the equipments are installed on the same skid for convenient operation and transportation. The client can make other accessories by themselves, the major equipments disc stack separator and decanter centrifuge technical configuration 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 bowl straight cone is made of duplex stainless steel 2304, the other bowl components are made of stainless steel 316L, the screw is made of stainless steel, the screw propeller is protected by tungsten carbide tiles, the bearing is SKF brand for longer working life, the solids discharged port and fluids discharge port are all protected by tungsten alloy. The bowl collection box are also made of stainless steel material.
GNSD-90 disc stack separator technical spec:

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 allowed solids content to feed into disc centrifuge should be less than 3%, the solids size should be as small as possible to reduce the abrasion.
For a customized solution of oil sludge separation system, pls contact with GN sales engineer.

3 units of dewatering centrifuge units are ready for shipment to Europe client. The equipment list including:

3 sets of GNLW224EP-VFD decanter centrifuge
3 sets of dewatering unit
3 sets of centrifuge feeding pump
3 sets of liquid collection tank

The working process is that the centrifuge feeding pump transfer the slurry to decanter centrifuge, at the same time, the proper chemicals are mixed and prepared in the PAM Three Tank Automatic Powder Polymer Mixing System, and the chemical dosing pump transfer the chemicals to decanter centrifuge, too. The slurry and chemicals are mixing in the decanter centrifuge feed tube, then the decanter centrifuge separate the solids and water in the screw. The longer of the centrifuge bowl length, the longer time of the fluids stay in the screw, so the separation performance is better to get clear water and drier solids. The water will be reused to save cost for the user, the waste will be reused a lot and save the waste disposal cost.
The decanter centrifuge features are we below:

1) The bowl material is made of duplex stainless steel 2304 by centrifugal casting.
2) The screw propeller is protected by tungsten carbide tiles with stellite backing plates for longer working life
3) The liquid discharge port and solids discharge port are all protected by tungsten carbide wear liners which is interchangeable.
4) The pond depth is adjustable and large G force range, the max G force is 4500rpm, the working bowl speed is 0~3800rpm.
The bowl frame is made of carbon steel, coated with heavy duty corrosion resistant (Ball lasting to SA.2.5 Grade, Zinc rich Heavy Duty epoxy primer 50um, Epoxy micaceous iron oxide intermediate 100 um, Polyurethane topcoat finishing 80um)
5) VFD control panel drived with main motor , back drive motor and feed pump motor.