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.