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What is 3 VFD PLC Controled decanter Centrifuge?

3 VFD means the decanter centrifuge have 3 VFD driving system, one for the centrifuge main motor, one for the back drive motor, the third is for the decanter centrifuge feeding pump motors. The PLC electric Controlled system means the centrifuge set up, operation, are thru Programmable logic controller system.GN PLC and VFD decanter centrifuge display the info. on the touch screen.


GN 3 VFD PLC Controled decanter centrifuge Features

The GN VFD and PLC controled centrifuge allows operator to adjust bowl speed and differential speed and pump speed without changing the pulley and belt. The fixed speed centrifuge can use mechanical method to change pulley for speed changing, but it may not reach the perfect differential speed for different applications. And the pulley changing for the speed is limited in several speed, and VFD decanter centrifuge can give any speed for the customers and any differential speed

Oilfield PLC Centrifuge

Anyway, depends on differential applications, and budget, customer may also choose to use the simple machine fixed speed decanter centrifuge with some pulley to change speed. And use the bypass function on GN decanter centrifuge feed tube to get the correct capacity from the feeding pump.

For GNLW363BG fixed centrifuge if we fix proper pulley to get the gearbox input speed from back drive motor to be 1152 RPM or connect the gearbox directly with coupling to a 6 Pole motor,and run centrifuge at 60HZ.

  • Case 1: Centrifuge Bowl Speed 3200 RPM, the Differential speed =( 3200-1152)/57=36RPM
  • Case 2:Centrifuge Bowl Speed 2500 RPM, the Differential speed =( 2500-1152)/57=24RPM
  • Case 3: Centrifuge Bowl Speed 2000RPM, the differential speed=(2000-1152)/57=15RPM


The Fixed Speed Centrifuge by changing pulley to get different bowl speed, but the back drive motor speed is the same, so it is not convenient to change the differential speed.For each fixed bowl speed, only one differential speed.

GN Lastest PLC Control Decanter Centrifuge.

PLC Decanter Centrifuge


To make it easier for operators to run GN VFD decanter centrifuges, GN Solids Control has now developed the PLC control system with touch screen.GN lastest PLC and Touch Screen VFD Control system is very compact with stainless steel and display all the data necessary for the operators. Dimension: LxWxH=1320x660x1629mm

The PLC system with Touch Screen displayed allow decanter centrifuge operators to set Bowl speed, Differential speed, and Pump capacity on the screen. Or Run the decanter centrifuge automatically.

Decanter centrifuges are specifically built for oilfield applications, both onshore and offshore drilling activities. Adjustable operating parameters enable the decanters to be employed for a wide range of solids control purposes in drilling fluid systems including: Barite recovery from the active mud system or from surplus mud in storage, separation of drilled solids from unweighted muds.

decanter centrifuge

The decanter is equipped with a hydraulic Coupling and belt pulley for main drive and a belt pulley system for the back drive, discharge funnels for solids and liquid discharge as well as a gearbox overload switch, cover open switch and vibration switch.



In most cases Decanter centrifuges do a good job of separation without benefit of chemical additives. However, some fluids containing a high proportion of colloidal fines, e.g. in drilling waste applications, may need to be flocculated to make them separable. Flocculent chemicals are expensive, so it pays to exploit the other tuning capabilities of the Decanter to the full in order to minimize the dosage.
GN solids has varies of choices on decanter centrifuge from top notch material build to economic material build, from big bowl big volume to small bowl small volume, from fixed speed to variable speed.

500GPM Mud Drying System consists of two mud tank system Tank #1 and Tank #2. Tank #1 is to process the dirty mud with shale shakers and decanter centrifuge and clean mud will fall into the centrifuge compartment.Tank #2 is to store dirty mud and dry cuttings from shakers.

Water Based Drilling Mud Drying System


Procedure Description of Water Based Drilling Mud Drying System
1) Dirty drilling mud collected from drilling site being transferred to Compartment #4
2) Screen Separation by GNZS703 shale shaker
#2 GNSB6x5-12J (37kw) Centrifugal Pump transfers dirty mud to #1 GNZS703 shale shaker. The mud goes through screens and falls into compartment #1, drilled solids discharge directly into mud feeder of GNZS594 Hi-G Cuttings Dryer Shaker.
Alternately, #2 GNSB6x5-12J (37kw) Centrifugal Pump can transfer the dirty mud to #2 GNZS703 shale shaker. The mud runs through screens and falls into compartment #1, and drilled solids are being conveyed by a GNSC180x2000 screw conveyor to mud feeder of GNZS594 Hi-G Cuttings Dryer Shaker.

Water Based Drilling Mud Drying System


3) Centrifugal separation by GNLW363G decanting centrifuge.
#1 Slurry Pump 50YZ40-10 (5.5kw) feeds mud in compartment #1 to GNLW363G decanter centrifuge. After the centrifuge treatment, clean mud will fall into compartment # 2, discharging drilled solids out of Tank #1 and collected by cuttings collection box #1. #1 GNSB6x5-12J Centrifugal Pump suck the clean mud from compartment #2 and transfer it out for reuse.

drilling mud drying system


4) Drilled Cuttings Drying by GNZS594 Hi-G Cuttings Dryer Shaker.
Drilled cuttings from screen surface of GNZS703 shale shakers will be discharged into mud feeder of GNZS594 Hi-G Cuttings Dryer Shaker. Dried solids discharges to Cuttings Collection Box #2 and a little mount of liquid falls into compartment # 3. When the compartment #3 is full, #2 Slurry Pump 50YZ20-18 (3kw) will transfer the mud back to the compartment #4 for recycling.

GN Skid-mounted mud handling system is a mud circulation system of mud configuration, purification and supply. It is specially designed and manufactured for oil gas drilling rig.Technological process description of every subsystem of oil gas drilling rig solids control system and installation, operation, maintenance and dismantling of the system will be provided.

solids control system

This solids control system can handle the drilling mud by classification with mud mixing, weighting, shearing, agitating and at the same time supply mud to the well bore. The system consists of mud tank, elevated mud manifolds, mud distribution device (feeder); including five stage solids control equipment - shale shaker, degasser, desander, desilter and decanter centrifuge. It is a combination of mud gas separator, mud agitation system, mud pump suction system, mud mixing and weighting system, mechanical shearing system, mud gun line, clean water supply line (electric control system, lightning system) etc.

solids control system



Oil gas drilling rig solids control system is a multifunctional design, therefore it can meet the requirements of various drilling depth and different types of drilling mud. Every subsystem and flow process can work separately or function as a whole.

Zero-Discharge System has became the trend of drilling waste management Dilled cuttings and the waste drilling water should be disposed in a safe way to avoid the harm to sensitive environment. This is crucial to oil based drilling mud. A set up of one zero-discharge system contains the following parts:

1. Linear motion shale shakers to separate the drilling cuttings of size over 200 mesh from the drilling mud. The solids off the shakers are discharged over a screw conveyor to transport them to vertical cuttings dryer.

2. Vertical cuttings dryer is used to recover the oil from the drilling cuttings. The centrifugal force inside the dryer allows the liquid portion of the feed pass through the cake bed of solids while the cake bed itself is continuously sent to the discharge at the outer diameter of the screen basket. The “dried” cuttings exit from the front of the machine where they are discharged to another screw conveyor for further handling and treatment. The recovered oil exists tangentially from the base of the unit into a holding tank.

Vertical Cuttings dryer

3. Centrifugal pumps feed the desander cone and desilter cones of the mud cleaner. The overflow discharge and the screen undersize are sent to the next compartment on the mud tank system. The cuttings with size over 250 mesh discharged by the mud cleaner screen are sent to the cuttings dryer.

mud cleaner

4. Progressive displacement pump (PDP) feeds the low-speed decanter centrifuge to recover the barite. The effluent is then fed to the high-speed decanter centrifuge to separate the colloidal particles from the drilling fluid. This fluid is mixed with the liquid from the cuttings dryer discharge.




5. The effluent from the high-speed centrifuge is mixed with the barite from the low-speed centrifuge and returned to the mud system with a centrifugal pump.

GN centrifuge provide you with efficient centrifugal separation technology both in the horizontal and vertical types of centrifuges.

Vertical cuttings dryer and decanter centrifuge as the key waste management equipment was shown on CIPPE exhibited by GN Solids Control. GNCD930 Cuttings Dryer is designed to treat the drilling cuttings off the shakers and under flows of hydro cyclones. The purpose of this dryer unit is to dry the wet drilling cuttings to a more environmental protective standards in term of harmful liquid existence in the drilled cuttings.

GN vertical cuttings dryer

GNLW553 series decanter centrifuge is often selected for dealing with the effluent of drilling wastes. GN beat the other suppliers by choosing the duplex stainless grade 2205 as the bow material; the stainless steel 316L as the screw material. The screw is protected by tungsten carbide tiles. All these ensure the long service life and less down time.

Decanter Centrifuges


PLC control and VFD cabinet is available to make it easy for operation and adjustment of technical parameters.