Desander Desilter

As one of the high speed decanter centrifuge manufacturer in China, GN solids control can produce different types, different size and different treating capacity centrifuges machine, by centrifuge sizes, we have 9 inch bowl centrifuge, 14 inch bowl centrifuge, 18 inch bowl centrifuge, 22 inch bowl centrifuge, 30 inch bowl centrifuge, the centrifuge bowl length diameter ratio available is 2, 3 or 4 series, so each centrifuge bowl with different bowl length for widely used. By centrifuge applications, we have centrifuge for T series dewatering type, Y series separation type and C series clarifying type centrifuges. The applications of GN centrifuges, including drilling fluids cleaning, drilling waste treatment, oil sludge treatment, industrial waste slurry treatment, construction mud cleaning, etc. By driving methods, we have VFD control decanter centrifuge and full hydraulic drive decanter centrifuge. Besides, we also produced 2 phase separation, 3 phase separation centrifuge; and horizontal centrifuge, vertical centrifuge ( 3 phase or 2 phase disc separator). For your different treating capacity and treatment requirement, we will offer different model centrifuge.

As a manufacturer of high speed decanter centrifuge, we have specific standard for its performance requirement in manufacturing as per industry standard.

1. The centrifuge shall be free of collision and abnormal sound when it is started to the rated speed
2. The starting time and maximum starting current when the centrifuge starts to the rated speed shall meet the design requirements.
3. The bowl speed shall not be less than 97% of the rated speed
4. Under unloading condition, the vibration speed of low speed centrifuge shall not be higher than 4.5mm/s, and that of high speed centrifuge shall not be higher than 7.1mm/s
5. Under unloading condition, the temperature of main bearing shall not exceed 70 ℃, and the temperature rise shall not exceed 35 ℃.

Recently 4 sets of Australia Standard Mud Cleaning Unit are ready for shipment to Australia.
The features of GN mud cleaning unit are as below:

The model is GNMS-200D, treating capacity is 200gpm, 4 sets

The mud cleaning unit consists of GNZY753E-Y4NF mud cleaner (including double deck shale shaker GNZS753, with 4ea of 4 inch desilter cone, feeding pump, mud tank, electric control system)

The standard of walkway, guardrail, electric motor, electric control system meets Australia safety standard
The working process of mud recycling system is that the pit pump( submersible slurry pump) collect the used drilling mud from mud pit and transfer to mud cleaning unit, the bottom shaker screen for coarse solids separation, the fluids drop into the mud tank, the desilter feeding pump feed the mud to 4 inch desilter cone for cut point 20 microns fine solids separation, the clean mud flow to another mud storage tank, which with mud mixing hopper and mixing pump, to mix with chemical additive to prepare for new drilling fluids and reused it for drilling. If the user need to separation cut point 5 microns, decanter centrifuge will be used and installed on the mixing tank.

The mud cleaning unit is a customized solution of mud recycling, we also have self contained mud recycling system for higher treating capacity and better separation performance It can be widely used for trenchless HDD project, CBM drilling, geothermal well drilling, Tunnel boring machine or bored pile project, water well drilling, diamond core drilling, etc. We have standard model GNMS-200B with capacity 200gpm, GNMS-400B with capacity 400gpm, GNMS-600B with capacity 600gpm, GNMS-800B with capacity 800gpm, the other models can be customized as required.
If you need a treatment solution of construction mud and HDD drilling mud, pls contact with GN solids control.

Recently GN produced double deck linear motion shale shaker are ready for shipment to Europe client.
The features of GNZS706 double deck linear motion shale shaker is as below:

1. The GNZS706 double deck linear motion shale shaker, top layer with 3pcs screen, total screen area is 2.0m2, the bottom layer with 3pcs screens, total screen area is 2.6m2. Total screen area is 4.6m2.
2. Working principal is that top layer screen is to separate coarse solids from the drilling fluids, the bottom layer screen is to separate the fine solids , the double deck shale shaker will increase the treating capacity and reduce the shaker screen damage.
3. The double deck shale shaker is to replace the old VSM300 shale shaker which installed on client’s drilling mud solids control system.
4. The double deck shale shaker equipped with mechanical fast lock wedges to assemble and disassemble the screens, for easy replacement of shaker screens and reliable operation. A ratchet wrench is used for screen pressing, if the ratchet wrench failed, the traditional hammer can be used to fix the screen.
5. With large screening area, linear motion vibration mode and high G force, it can meet both onshore drilling and offshore drilling fluids trearment requirement.
6. Mechanical shaker deck angle adjustment synchronously while operation is applied.
7. Wear resistant olyurethane rubber strip with good sealing effect and longer working life.
8. we can provide bottom fluids outlet and side fluids outlet for option depends on their requirements.
   Except for double deck shale shaker, GN also produce single deck shale shaker, including 2 panel shale shaker, 3 panel shale shaker, 4 panel shale shaker, 5 panel shale shaker, for different treating capacity and mud cleaner with desander cone & desilter cone. Pls contact with GN solids control for more information.

Depends on the density and viscosity of the fluids to be treated, to make the solids liquids separation easily, for the fluids which is difficult to separate, normally we need to enlarge the solids particle size, reduce fluids viscosity and increase solids liquids density difference by methods of mechanical and chemical ways. Besides, we can also apply to increase concentration, preconcentration and wear resistant accordingly to improve the centrifuge treating capability and reduce the abrasion to the centrifuge screw.
The solution to enlarge the suspended particles by mechanical or chemical methods including:

1. Inorganic electrolyte is added to the suspension fluids as a coagulant to agglomerate small particles into large particles.
2. Mixing with flocculants or coagulants, the order of adding various flocculants, and the intensity and time of mixing have an impact on the flocculation effect. Therefore, the type and dosage of flocculants need to be determined by the mixing test. The requirement of Flocculation treatment effect is that the settling speed of flocculated fluids is fast, and the clarity of top layer clear liquid is good.
3. Change the viscosity and density of the fluids by adjusting temperature
   Especially for the oil sludge treatment by decanter centrifuge, heating the oil sludge and mixing with proper chemicals to reduce the viscosity will increase the solids liquid separation efficiency.
   A dewatering centrifuge package including one unit of dewatering centrifuge, centrifuge feeding pump, fluids catching tank with pipelines and tank accessories, chemical dosing unit.
   GN dewatering centrifuges can be used for treatment of oil sludge, drilling mud, construction slurry, industrial waste water and other kinds of solids liquid separation. The centrifuge models including 14 inch bowl centrifuge, 18 inch bowl centrifuge, 22 inch bowl centrifuge and 30 inch bowl centrifuge. If you need a dewatering centrifuge package, pls contact with GN solids control.

GN produced 3 phase disc centrifuge has been widely used for solids oil water separation of oil sludge treatment system. The working principal is as below:
Centrifuge separation methods include centrifugal sedimentation and centrifugal filtration, and centrifuge sedimentation can realize solid-liquid separation or solid- light liquid – heavy liquid separation. The working principles of two phase horizontal decanter centrifuge, three phase horizontal decanter centrifuge and three phase disc centrifuge produced by GN solids control are all centrifugal sedimentation. Therefore, the density difference between solid particles and light liquid and heavy liquids to be processed should be considered.

The important factors of the separation performance of the centrifuge are the gravity of the separator in the centrifuge bowl and the working area of the bowl. The larger of the bowl working area is, the stronger of the separation capacity is.
For the same oil sludge, its centrifugal sedimentation speed is constant. To improve the separation performance of the centrifuge, it is necessary to increase the working area of the centrifuge bowl. You can increase the number of separation discs, increase the rotation speed, optimize the surface and hardness of the discs, and reduce the bowl vibration (improve the bearing performance, enhance the rubber damping, etc.).

To improve the 3 phase disc centrifuge separation performance, we suggest to reduce the feed material solids content less than 3%, and the max solids size should be less than 100 microns. The material of bowl influence if the bowl can rotate with high speed and improve the disc centrifuge performance. The bowl is made of imported high strength, corrosion resistant stainless steel material, integral forged by high pressure, four non destructive testing, CNC machining, in order to ensure that the disc centrifuge operates safely and reliably.
For more information, pls contact with GN solids control.

GN produced oil sludge treatment disc separator has been widely used for oil, water, solids separation.
The features of disc separator is as below:
1）Automatically solids discharge
2）Adopt labyrinth sealing, centripetal pump for discharging, outlet high pressure (light liquid), which can be transferred directly.
3）The centripetal pump system has stable output pressure, wide adjustment range and convenient operation
4) The VFD power transmission system with stable operation ,no noise and odor pollution.

5）The fully automatic control cabinet with safety protection device which can directly adjust parameter on the display screen to achieve the best effect of separation and slag discharge.
6）With fully automatical motor protection device
7) The small piston adopts a double piston structure, with large slag discharge and more stable, less power consumption.
8）The outlet of light phase and heavy phase use online voltage regulating structure, and the clarity of light phase and heavy phase can be adjusted flexibly and timely as required.
9）Control panel is clear and intuitive, simple and convenient operation.
The disc separator main component is the bowl, it is composed of bowl body, cover, locking ring, the disc holder, discs, etc. The bowl is made of high strength, anti-corrosion stainless steel material, integral forged by high pressure , four non destructive testing, CNC machineing, to ensure that the separator operates safely and reliably under long time, high load, high speed.
The disc is also the key part of the disc separator.
The fluids feed to 3 phase disc separator with a limit of solids content below 3%, and max solids size smaller than 1mm.
If you need a 3 phase disc separator for light liquid, heavy liquid and solids separation, pls contact with GN solids control. We have models with 1m3/h, 5m3/h, 15m3/h, 20m3/h treating capacity for option.

Recently one batch of 18 inch decanter centrifuges and mud agitators are ready for shipment to Offshore drilling company.

The decanter centrifuge with 4 lifting pads which meets the lifting requirement of offshore drilling company. The centrifuge pulley protection cover is painted with safety mark. The main motor and back drive motor comply with ATEX explosion proof standard for offshore used. The 18 inch decanter centrifuge model number is GNLW453, the bowl diameter is 18inch (450mm), bowl length is 61 inch (1540mm), the typical treating capacity is 264gpm (60m3/h) for drilling fluids. The max bowl speed is 3200rpm, the typical bowl speed is up to 2800rpm, the max G force is 2578G, typical G force is 1973G, the main motor is 55KW, the back drive motor is 22KW. The recommend feeding pump motor is 15KW. The mechanical separation cut point is 2 ~5 microns.

Features of offshore used decanter centrifuge:
1) Compact structure, smaller footprint, lifting pad to meet offshore lifting standard
2) ATEX certified motor and control panel to meet offshore use
3) The screw is protected by tungsten carbide tiles for longer life and easy maintenance
4) The bowl is made of duplex stainless steel SS2304 by centrifugal casting
5) The solids discharge port and fluids distribution port is protected by tungsten carbide inserts for wear resistance.
The coupler type mud agitator consists of C face ATEX explosion proof motor, helical bevel heavy duty gearbox, coupler painted with yellow color, offshore standard skid, agitator shaft, impeller, stabilizer. It is suitable for oil based mud , water based mud and synthetic based mud. Based on mud tank dimension, we will use different size impeller.

Except for coupling connection mud agitator, GN also produce direct connection mud agitator with helical bevel type gearbox, We can provide different models mud agitators for your different applications.

A zero discharge system consists of three or four linear motion shale shakers to treat mud to separate the cuttings from drilling fluids. The drilling cuttings are discharged from shale shaker, desander, desilter, decanter centrifuge to a screw conveyor to transfer the cuttings to vertical cuttings dryer ( oil based drilling cuttings) or high G drying shaker ( water based drilling cuttings).

The vertical cuttings dryer is used to recover the oil from drilling cuttings. The discharged solids with oil content below 5% will be collected by screw conveyor for disposal or landfill directly or be sent to Thermal desorption unit for further heating and reduce the oil content to meet the environmental protection regulation.
The recovered oil fluids will be collected by fluids holding tank. One submersible slurry pump or progressive displacement pump transfer the fluids to decanter centrifuge to separate the colloidal particle solids from the drilling fluids. The fluids is returned to the solids control system by a transfer pump.

The water based drilling cuttings are treated by high G drying shaker through shaker screens, the discharged solids together with the solids discharged from decanter centrifuge are collected by screw conveyor and transfer to cuttings solidification unit, to mix with lime and absorber, the solidification of waste allowed the transportation and disposal of the solids without secondary containment, and converts hydrologic sensitive liquid and semi-liquids waste in a physical form which can be storage safely.
During the whole processing, the drilling waste treatment is in a closed loop without requiring dig a waste pit. Zero discharge system including shale shaker, desander, desilter, mud cleaner, centrifugal pump, decanter centrifuge, high G drying shaker, vertical cuttings dryer, waste centrifuge and feeding pump, screw conveyor, etc. If you need a zero discharge system for drilling rig, pls contact with GN solids control.

An integrated solids control system might include scalping shakers, linear motion shale shakers, desander , desilter, vacuum degasser, decanter centrifuge, mud agitators, mud gun, mixing hopper, centrifugal pump, which are installed on the mud tank system.

The solids bigger than 100 microns are removed by primary shale shaker, solids bigger than 45 microns are removed by desander, solids bigger than 25 microns are removed by desilter/ mud cleaner, solids bigger than 10 microns are removed by decanter centrifuge. The low gravity solids are separated by high speed decanter centrifuge, the high gravity solids are separated by middle speed decanter centrifuge. The drilling cuttings will be collected by cuttings collection box or screw conveyor, and then transfer the drilling cuttings to drilling waste management system.
Water based drilling cuttings treatment system consists of high G drying shaker and VFD decanter centrifuge with chemical dosing unit, the water can be sent to waste water treatment facility for final disposal or add additive to prepare for new drilling fluids.

Oil based drilling cuttings treatment system including vertical cuttings dryer, VFD decanter centrifuge, the recovered drilling fluids will be pumped back to solids control system for reuse.
The linear motion shale shaker will be installed on the shaker tank with drilling fluids distribution box which will receive the drilling fluids from flowline and flow to each shale shaker evenly for better separation. The shaker screen installed on the shale shaker is composite material frame shaker screen which is produced comply with API RP13C standard. We can produce shaker screens from API 20 to API 325 as per client’s requirement, the mud engineer can control the mud weight to use different API mesh screen.
GN solids control can design and produce the integrated solids control system for their drilling rig, for more information of our equipments, pls contact with us freely.

The solids vacuum pump is mainly used for drilling cuttings transfer, mud tank cleaning, drilling rig platform cleaning, waste pit cleaning, etc. applications by oil service company and drilling companies.

GN solids control have different model vacuum pumps for option based on their requirement. GNSP-40B max capacity is 40m3/h, GNSP-20B max capacity is 20m3/h, GNSP-10B max capacity is 10m3/h. The design capacity of the vacuum pump is nominal capacity, it will varied based on different material, suction and discharge distance and depth. The air supply should be sufficient for vacuum pump reliable operation. The drilling waste can be picked up automatically and transferred to drilling waste management system. Another method to transfer drilling cuttings is screw conveyor, due to place limit and rig site layout, the screw conveyor system may not be used, then solids vacuum pump can be used instead.
The suction process is that the air compressor provide the air into the vacuum generator, which produces negative pressure in the pump body and suck the drilling waste from the suction pipe. The discharge valve is in close condition. According to suction time, the pump will suck material automatically.
The discharge process is that close the valve of vacuum generator, the air flow to the pump body to produce positive pressure inside the pump body. The discharge valve is open, and the drilling waste is pushed out by positive pressure to the expected area.
The features of GN vacuum pump:

1. It can be used for hazardous area application, since it is 100% air operation pump. But air compressor is required for air supply.
2. The suction horizontal distance is up to 50m, the discharge horizontal distance is up to 500 ~ 1000m.
3. The solids size allowed to enter into vacuum pump is up to 50mm or 75mm, the solids content is up to 80%.