It’s very dangerous if the operator didn’t read the manual carefully and violate the steps or regulations to operate a disc separator. Here are the requirements of how to start and stop a disc separator.

2020.12.11 Disc Stack Separator

One. The material entering the disc centrifuge, which must be the lower part of the decanter centrifuge tank, should reach 65°C. It has the advantage of helping to achieve a good separation, minimizing the solid phase in the material, and slowing down the clogging inside the disc centrifuge drum. In addition, it helps to extend the disassembly and cleaning time cycle of the disc centrifuge drum.

Two. The screw pump of the disc separator should be set at a flow rate of 30 cubic meters per hour. The backflow butterfly valve on the screw pump should be open. This is because the disc centrifuge’s material supply line is fitted with a strainer. The strainer barrel will filter out the fibers and oil and mud masses but blind or block the strainer barrel. Especially when the material temperature is lower than 65℃, the oil sludge is more likely to form clumps. The blockage happens when the butterfly valve wasn’t adjusted, the flow meter shows that the flow rate soon becomes smaller; when the butterfly valve was turned a bit down, the flow meter shows that the flow rate soon becomes smaller. This shows that the filter of the strainer is blocked. At this time, the slurry supply pump should be stopped a new filter barrel should be replaced, then restart the slurry supply pump, and turn the flow rate to around 9 cubic meters per hour. The blocked strainer barrel should be cleaned up quickly and installed in time, otherwise, the material supply of the disc separator will be stopped.

Operation requirements of disc separator shutdown.

First. The decanter and the centrifuge must be cleaned inside before shutdown.  The decanter needs to be stopped first, flushed, and then the centrifuge stopped and flushed. This is because, in this system, the decanter centrifuge precedes the disc centrifuge, and flushing water is relatively cleaner water than from the centrifuges.

Two. Close the ball valve of the slurry supply pipe on the inlet of the decanter centrifuge, open the valve on the flushing line of the decanter separator, turn on the flushing pump, and use flushing water for cleaning. Before flushing, lower the drum speed of the decanter to 1500 RPM and set the differential speed to 25 RPM for the best flushing effect. In addition, it is possible to flush twice with two tanks of water, due to the limitation of the water storage capacity of the disc centrifuge tank. Be sure the inside of the decanter centrifuge drum is clean. Then, turn off the pump, close the valve on the flushing pipe, and open the valve on the decanter centrifuge slurry supply pipe.

Three. The disc centrifuge continues to work until the outlet liquid position reaches 600 in the tank. Close the slurry pump, and press the partial slagging button, which will appear to make the slag current spike. You must wait for the slagging current to back down to normal; Press the partial slagging button again, and you also must wait for the slagging current to back down to normal. After that, press full slagging button once, so that the operation will empty internal material out of the disc centrifuge. The irregular operation will cause disc centrifuge motor overload and fault shutdown.

Four. Close the butterfly valve on the filter outlet pipe, open the butterfly valve on the flushing water, and switch on the flushing pump. After the flushing is completed, follow the disc centrifuge shutdown operation requirements, twice partial slagging, once full slagging, then empty the disc centrifuge rotor drum.

Five. Close the valve of the flushing pipe and open the valve on the material line so that its pipeline is in standby mode.

At last, stop the disc separator. When the drum comes to a complete off, stop the pump and turn off the power.

PS. Every day after the use of the fine shaker, use hot water to rinse, and then stop the shaker, and use tools to clean the sieve mesh surface. You must make ensure that the screen surface is clean to prevent the sediment dry on the screen surface, which could be difficult to clean, reduce the separation and spill over slurry to the outlet solid phase.

GN usually provides disk separators with centrifuges together with pumps. Besides, pumps and mud tanks are sometimes necessary. If you want more information, please visit:


The 703 shaker screen is a very popular vibrating screen manufactured by GN Solid Control.

Shaker screen options can be discussed by manufacturer engineers, users, and contractors. The replacement of screens should only be selected by the user.

gnps 703 shale shaker


Changing the screen after use, if the screen mesh is damaged or needs to be replaced.  Remove the wedge, remove the screen, check whether the adhesive strip is enough, then place the new screen on the vibrating table and fix it stably.

Note: When using a shaker screen for the first time, the tension locking should be removed.  The screen mesh could be loose after working, so the operator should always check the mesh of the screen by hammering the wedge.

To adjust, turning the handle wheel near the spring clockwise will increase the angle. While turning the handle wheel counterclockwise will decrease the angle of the deck.

The scroll screen output angle adjustment can be used in both drive and lock modes. When all the mixers have been delivered, the whisk unit is at 0°. When the user uses the vibrating screen according to the characteristics of the drilling mud and the flow rate, the same screen is used, the larger the angle, the better the processing and the higher the processing capacity. As the drilling fluid exits the vibrating table, increasing the angle of the platform prevents the drilling fluid from migrating.

GNPS703 can adapt to different meshes. Generally, when the vibrating screen is the first step of separation equipment, the vibrating screen can be 30-100 meshes. When the shaker is part of the sludge remover, the screen can shake 80-200 mesh. This equipment can use 10-200 mesh screens.

In order to simplify the installation and removal of the screen, the GNPS703 has developed a quick installation process. The construction is a special type that uses tension wedges to hold the screen in place.  The structure consists of stand rods and wedges. When installing the screen for the first time, we need to check the size of the screen, for example, 1250±2mm, the tolerance should not exceed that. After the rubber slide is fixed, install the screen and stand behind the sliding screen (drilling fluid suction) and drive the wedges evenly on both sides, and push or tighten the wedges with a hammer to make both sides flat. level. Re-tension each screen.

The low density liquid separated from the shaker could pumped into a centrifuge for second separation.

shale shaker is a screen mesh or a sieve that vibrates. The vibrating shaker screen mesh strains the slurry and liquid out of the mud. This mud is further sent to the mud tank. When the drilling equipment processes finer cuttings, they can usually be collected and recycled by a shale shaker.

The different need for a shale shaker screen is based on different mesh sizes and could be adjusted following the various API mesh number standards.

Mesh size usually is connected with the mesh number (a US measurement standard) and its relationship to the size of the openings in the screen and the size of particles that could pass through the openings. It is very easy to figure out the mesh number. All you need to do is count the number of openings in one linear inch of screen. This count is called the mesh number. A 4-mesh screen mesh means there are four small square openings across 1 inch of the screen. A 100-mesh screen means 100 openings per inch, and so on.

GN Solids Control manufactures shale shakers and screen meshes in the oil and gas industry. We provide API standards shale shaker screens for solids control shakers and mining shakers. GN shale shaker screens are compliant with API RP 13C.

What API Size Shaker Screen is available from GN?

D 100 Separation(Micron) API Screen Number
>1850.0 TO 2180.0 API 10
>780.0 TO 925.0 API 20
> 462.5 TO 550.0 API 35
> 390.0 TO 462.5 API 40
> 275.0 TO 327.5 API 50
> 231.0 TO 275.0 API 60
> 196.0 TO 231.0 API 70
> 165.0 TO 196.0 API 80
> 137.5 TO 165.0 API 100
> 116.5 TO 137.5 API 120
> 98.0 TO 116.5 API 140
> 82.5 TO 98.0 API 170
> 69.0 TO 82.5 API 200
> 58.0 TO 69.0 API 230
> 49.0 TO 58.0 API 270
> 41.5 TO 49.0 API 325


How many types of shaker screens does GN have?

According to the factory stock, there are at least 3 kinds of screens: flat stainless-steel screen, wave stainless screen, and Polyurethane sieve plate. We don’t use API to describe a sieve plate. But Polyurethane sieve plates are also widely used in exploring industries.

Now, GN is able to provide replacement screens for nearly all widely known international shale shaker brands in the drilling industry.

1. GN uses robots to weld the internal steel frame to ensure consistency.
2. GN has its 3-layer design of API 60, while other suppliers in China use API 120.
3. The outer plastic material is 100% new and clean, not recycled materials.
4. The wire mesh is pre-tensioned so that the surface of the screen is stronger.
5. GN screen can be repaired with a screen rubber stopper when the damage is less than 10% of screen mesh.

All in all, GN screen meshes are well-designed and welcomed around the world. If you have a solids dewatering project and need replacement screens, don’t miss GN Solids Control!



GN Solids America is committed to protecting the environment and complying with environmental discharge regulations. Especially in drilling fluid recycling applications, GN solids control equipment could maximize the recovery of drilling cuttings and recover fluids. GN small decanter centrifuge is mainly used in diamond drilling and core industry to remove fine solids in fluids.


The GN decanter centrifuge combined with other solids control units forms a complete dewatering system. At the remote drilling site, our dewatering system allows drilling contractors to reduce the amount of wastewater and water transported. The complete dewatering system can fully recycle contaminated drilling fluids and recover clean water. The Vibratory Screen functions as the first stage to launch large, aggressive particles. The GN decanter centrifuge is normally installed at the end of the dewatering system to remove fine solids and obtain clean fluids. Here are some reasons why many drilling companies choose the GN centrifuge. Small Decanter Centrifuge

Advantages of GN Small Bowl Centrifuge


  1. GN core and diamond drilling decanter centrifuge is a 9” bowl centrifuge that occupies a very small size and fits the restricted drilling site.


  1. 3800RPM is capable of removing 2~5 micron solids in fluids. We also offer Fixed Speed ​​Control Panel, Variable Frequency Drive(VFD) Control Panel, Standard Motor and Hydraulic Motor to meet or exceed customer expectations.


  1. We use high-standard duplex stainless steel to manufacture the centrifuge, and high-quality and durable bearings are also installed in the decanter centrifuge.


  1. The GN centrifuge can efficiently remove finer solids and control the weight or density of fluids, thus obviously improving ROP.


Except for drilling and diamond applications, GN centrifuges are also used in oil and gas drilling fluid industry. We have 14″, 18″ and 22″ bowl centrifuges to meet different requirements. Contact GN for more information.

The GN Compact Solids Removal Unit (SRU) is used for solids control of drilling fluids for small mining rigs for diamond drilling. Instead of using traditional drilling sumps, the GN Solids Removal Unit is described The GN Solids Removal Unit (SRU) is used for solids control of drilling fluids for small mining rigs for diamond drilling. Instead of using traditional drilling sumps, drilling contractors and resource companies in the drilling industry describe the GN Solids Extraction Unit as the way of the future. The closed loop drilling fluid system is a cost-effective solution to reduce environmental impact and greatly improve the efficiency of drilling operations.

Working principle of the GN solids removal unit

Drilling fluid circulates directly from the drill collar to the GN Mini Shale agitator for first-stage solids removal. And a positive displacement feed pump carries drilling fluids below the agitator tank to feed the GN mini decanter centrifuge for fine solids removal. Clean drilling fluids are returned to the drilling hole for reuse. The highly mobile unit also incorporates a mixing chamber and mixing hopper and pumps, allowing chemical drilling fluids to be added accurately and efficiently. The GNLW223 Baby Centrifuge is the world’s smallest decanter centrifuge for treating drilling fluids. It is popular in the diamond core drilling industry.


Features and Benefits of the GN Solids Removal Unit

Process capacity: 0-150 LPM

Reduction of drilling fluid consumption by more than 40% Autonomous unit with agitator, centrifuge, pumps, mixing, tanks and generators (optional).

Environmentally friendly, no drilling of wells: reduced water consumption

Reduces site installation and repair costs

Reduced downhole rig costs by improving diamond drill bit/rod life.