Decanter centrifuge is an important solids control equipment used in oilfield drilling projects. GN Solids Control build big bowls decanter centrifuges for the customers around the worlds. This big bowl decanter centrifuge is GN new designed model which has a long bowl body and larger diameter.


GN Big Bowl Centrifuge Optimized Design

GN big bowl centrifuge has a bowl length of 71 inches that could make the slurry stay longer time in the bowl. With 22-inch bowl diameter, the solid particles in the bowl will have a large G force which is helpful for solids settling on the inwall of the bowl. The upgraded material of stainless steel 2205 makes the bowl balance better. Besides the upgrade on the material and bowl design.

GN big bowl decanter centrifuge has several features:

  1. Main drive and back drive motor located at the same sides for making enough space for the operator.
  2. The centrifuge bowl clamping and belt fasten device avoid the bowl shaking to damage during transportation.
  3. Air pressure support to make them open for the collection box lid much easier.
  4. The centrifuge base seat has the forklift operation holes that the centrifuge would be convenient for forklift carrying.


The GN big bowl decanter centrifuge sent to different countries for drilling mud solids control to separate the much fine solid. Always there will be a small bowl centrifuge before the big bowl centrifuge to remove the large content solid, then the big bowl for further treatment to recover more drilling fluids.


GN solids control could provide a decanter centrifuge for application in diamond drilling, oilfield drilling as well as waste management.


ViST is Vacuum Screen Technology is to work with shale shakers to reduce drilling waste and recycle drilling fluids.


ViST was pending a patent design developed by GN Solids Control.  GN tested ViST with drilling fluids. It proved to be very efficient for recycling drilling fluids.

The ViST Pan is installed under the last screen or mounted externally. And a suction hose is connected to ViST vacuum unit. The compressed air from the air compressor or the rig air supply is required to create suction on the last screen surface, pulling additional fluid off the cuttings. It can reduce the liquid on the cuttings by 30-50%.

As a result,ViST maximizes the volume of recovered and reused fluids and it provides dryer cuttings. Dryer cuttings mean less drilling waste and more recovery drilling fluids. So ViST can save money for operators on drilling fluids and waste management.


Features & Benefits


Widely application for OBM, SBM, and WBM.

Both onshore and offshore applications reduce waste and recovery fluids.

To replace High G drying shaker without any extra consumption of shaker screens.

Less footprint and easy installation without welding.

Reduce waste by 30% to 50%

A finer screen can be used to improve the solids control efficiency.

Less cost for drilling cuttings transportation

No electric power is required, suitable for work in Hazardous areas.

The suction and discharge time is adjustable according to different drilling conditions.

One ViST can be connected to 2 – 3 shakers with only one air supply


GN automatic chemical preparation and dosing unit is often used in the preparation, storage, and dosing of powder chemicals. The whole set of devices integrates automatic preparation, dissolving, and dosing, and operates automatically; the quantitative screw conveying and timing vibration design of dry powder feeder can reduce the agglomeration of powder. The dry powder dosage and water inflow can be adjusted, and the corresponding concentration of the liquid chemical can be prepared according to the working conditions. The built in the electric control cabinet can control the whole preparation and dosing process.


The GN automatic dosing unit is widely used in wastewater and sewage treatment and other process media treatment in petroleum, chemical, paper, electric power, coal, pharmaceutical and food industries.

Because of its wide applicability, the automatic dosing the unit can be used with main dewatering equipment such as decanter centrifuge, screw press, and filter press for preparation and dosing flocculants solvent.

  1. The dissolving tank is made of stainless steel SS304 or PP (polypropylene) and the agitator is made of stainless steel 304
  2. The power of the whole machine includes all agitators, dosing screw, excluding dosing pump
  3. The system is equipped with one dosing pump as standard, or one can be added according to the customer’s requirements to meet the requirements of 1 duty 1 standby.
  4. According to the working conditions on-site, the motor, and control cabinet can be explosion-proof or non-explosion-proof.

Automatic Dosing System Main Features & Applications

  • High integrated all-in-one Equipment.
  • Highly automated, the complete system can be controlled intelligently by PLC.
  • Compact structure, easy to operate and install, the onsite installation is only related to water and power.
  • Safety and Reliable work. The system will automatically shut down and issue an alarm signal if the equipment fails to work.
  • Stable Performance, and Fully Automatic Control, the amount of dry powder is automatically adjusted according to the change of water volume.
  • Good corrosion resistance, and all contact parts with the medium is made of engineering plastics or stainless steel.
  • Suitable for powder, granular, fibrous, and other materials, as well as the preparation and dosing of liquid chemicals.




GN 3 phase decanter centrifuge is used to separate two liquid phases from one solid phase at the same time. As is known, decant centrifuge principle of separation is by G force. Because of the different densities of the (immiscible) liquids and the solid , so all three phases can be discharged simultaneously using the GN 3 Phase decanter centrifuge. GN Solids Control design and manufacture three phase decanter in different bowl size include: 350mm, 450mm and 520mm.

However, to do the 3 phase separation, the solid phase must be the specifically heaviest phase and the two liquid phases should have different densities.

The structure and principle of the three phase decanter centrifuge are similar to the two phase decanter centrifuge. The difference is the way of the liquid discharged. There are two liquid phases in separation in a 3 phase decanter centrifuge. A higher density liquid phase is discharged under pressure, and the lower density liquid is discharged without pressure. Following is the principle drawing of the 3 phase decanter centrifuge.



GN 3-Phase Decanter Centrifuge Parameter

Model GNSX-350, GNSX-450 & GNSX-520

  • Applications For Three Phase Decanter Centrifuge
  • Separation of oil sludge containing oil from refineries, oil ponds, etc.
  • Extracting animal/vegetable fats and oils
  • Starch manufacture for separating wheat starch and gluten.
  • Oil Water and Solids separation.
  • Coal tar treatment
  • Biofuel production
  • Lubricating oil additives
  • Meat/poultry/fish (edible & inedible fats; yellow, white and brown grease)
  • Edible oils (olive, palm, granola)



GN Solids control presents its Positive Displacement Pumps with the GNG Screw Pump series in its different presentations, depending on the work flow, we have them from 10 to 90 m3 / h and 4kW to 22kW. These positive displacement pumps are hydrostatic equipment. They pump a defined volume regardless of engine revolutions, but virtually independent of pressure. A positive displacement pump is one that displaces (delivers) the same amount of fluid for each rotation cycle of the pumping element.


These pumps are ideal for feeding centrifugal decanters without agitating the drilling mud. The main parts are the screw shaft (rotor) and the screw shaft bushing (stator). Due to the special geometric shape of the two parts, they form the pressurizing capacity separately. The fluids flow along with the shaft, the internal flow speed is slow, the capacity remains, the pressure is constant, so it will not generate vortices or agitation. The pump shaft is made of stainless steel, the GNG series pump is available for options with a full stainless steel body.

The GNG centrifugal feed pump can be driven by the coupler or adjust the speed using a variable speed motor, triangle V-belt, gearbox, etc. G series positive displacement pump with fewer accessories, compact structure, small volume, easy maintenance, rotor and Stator are wear parts of this pump, it is convenient to replace. The stator is made of elastomeric material, so it has particular advantages over other pumps for transferring fluids with high viscosity and included hard suspended particles.

Positive displacement pumps have multiple applications within the oil and gas industry, for the shipbuilding industry, beer industry, urban and wastewater treatment, paper industry, chemical industry, pharmaceutical industry, food industry, etc.