Decanter Centrifuge

GN now has over 30 high configuration decanter centrifuge stocked for urgent request and prompt delivery. The decanter centrifuge is normal type equipment used in the drilling fluids recycling system for fine solids separation. As a leading manufacturer of solids control equipment in China, GN always makes the inventory plan for the main equipment that most requested by the clients, like the shakers, decanter centrifuge etc.

What are the basic technical parameters of the decanter centrifuge
1. Size: 14 inch of bowl diameter, 50 inch of bowl length, this length and diameter ration is fine for most of the application
2. Treating Capacity: Max. capacity of 200 GPM with recommended capacity of 132 GPM
3. Speed: Designed Max. speed is up to 3900RPM with recommended normal working speed of 3200 RPM.
4. G Force: 2062 @ working speed 3200 RPM, under this speed, the solids with size larger than 5 microns could be removed out.
5. Gearbox: Torch of 3500 N•M, gear ration 57:1
6. Motor Power: Dual motors as main and auxiliary drive, 37 KW + 11 KW

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GN Decanter Centrifuge In Stock

What is the configuration the decanter centrifuge in stock
1. Material: Bowl is made of Duplex stainless steel 2205, screw propeller is from SS 316.
2. Bowl Fabrication: Centrifugal Casting technology ensures better material distribution to maximum avoid casting defects.
3. Protection: Screw propeller is protected by the tungsten carbide tiles with uniformly thickness of 4mm, much better than spraying welding 2mm uneven surface. Solid discharge ports are protected by ceramic lining for long life time and less maintenance. Collection box has air spring for easy open and damping close to protect operator.
4. Bear Brand: Genuine SKF bearing for longer and reliable operation
5. Control Panel: Both fixed speed and VFD panels are available as per customers’ requirements. Main electric components are from ABB, Siemens or Schneider.
6. Certificates: CE certificate for main machine, DNV lifting certificate for frame base, ATEX/ IEC Ex certified electric motors and panels are available hazardous area application.

Sufficient inventory is a guarantee for customers’ urgent request and prompt delivery. Now is near the end of the year, and GN is starting the customers profit surrender plan. Call GN no hesitation and you can get a special discount.

Decanter centrifuge is a kind of equipment used very often in oil drilling separation process. Like in the drilling mud recycling system, the decanter centrifuge is located after the de-silter cyclone unit for ultra fine solids separation. Some operators will install the decanter centrifuge unit on the mud tank top, while, the decanter centrifuge is not used all the time during the drilling. Thus, some drillers take out the decanter centrifuge from the mud tank system and put it on a skid closed to the mud tank system for easy connection once needed.
Comparing with other solids control equipment in the mud recycling system, the decanter centrifuge is of high cost. This is also one reason it will be taken out from the mud tanks system, always, the driller will find a third party who owns the centrifuge unit to sign the lease agreement.

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GN Decanter Centrifuge with Skip Frame

What Materials Are Included in GN’s Centrifuge Modular Package
1. Decanter centrifuge unit – GN has now 3 main decanter centrifuges for oil industry with bowl size of 14 inch, 18 inch and 22 inch. All these 3 types could be equipped with a PLC smart electric panel for all the remote operation. Both the electric motors and control panels provided are complying with the explosion proof standard. Either for Zone 1 or Zone 2 is available.
2. Electric Control Panel – All the above 3 sizes centrifuge has VFD control panel. The panel would be put on the skid, people could operate on the ground. The panel need is designed positive pressurized needing air blowing into the panel for cooling down and explosion purpose.
3. Telescopic Skid – GN’s telescopic is designed to comply with the DNV lifting certification for widely acceptance. The operator could adjust the skid height as per the actual site condition.
4. Screw Feeding Pump – one unit screw pump is fixing on the skid for feeding the slurry to the decanter centrifuge. This pump is also controlled in the aforementioned control panel.
5. Other Accessories – hose from feeding pump to the decanter centrifuge inlet, solids discharge chute for the centrifuge, liquid discharge port matching flange with nipple and the tools case.

GN’s modular centrifuge package is compact structure for easy location on jobsite. GN can also provide customized centrifuge skid by knowing the installation dimension of Customers’ existing centrifuge unit.

Drilling cuttings would be produced when drilling. In order to recover and reuse the drilling fluids, the operator need remove the drilling cutting from the drilling fluids. The well known equipment to remove the cutting from drilling fluids is the solids control equipment. So, what is the cuttings dewatering system? And how it works to remove the cuttings in the drilling fluids?

The drilling fluids with cuttings coming from the well hole is fed to the shale shaker unit via the elevated pipeline, this the method used in oil rig package. For some other drilling project, like the no-dig horizontal directional drilling, the used drilling fluids would be collected into a pit on the ground, and then the fluids would be transferred by a slurry pump to the shale shaker unit.

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Mud Dewatering

Shale shaker unit is the first stage for removing the coarse size cuttings in the drilling fluids. And then the de-sander and de-silter cyclone could remove out the cuttings with size down to around 20 microns. The used drilling fluids treated by the de-silter cyclone are already clean enough to be reused. However, the cuttings with size less than 20 microns would build up to make a heavy mud which is not suitable for normal drilling application.
The dewatering system is especially equipped to remove the ultra fine solids that even cannot be separated by the decanter centrifuge unit. A decanter centrifuge like GN’s 22 inch model GNLW553 can remove the cutting with size down to 5 microns. For the even finer cuttings, we need a flocculation process to gather the ultra fine solids so that the decanter centrifuge could remove out. The polymer mixing system is a critical part of the dewatering system, GN’s polymer mixing system is designed with powder hose conveyer, automatic dosing system, mixing tank and diaphragm pump for transferring the polymer to the drilling fluids. For better flocculation process, always one acid tank and one alkali tank is equip to make the suitable PH value.
Sometimes, the drilling fluids are mixture of water and oil, GN is also able to provide the oil water separator system for recovering the water and oil.
GN now has already have the design of the complete system for drilling cutting dewatering system, for more
information, please feel free to contact with us.

In the just past MinExpo 2016 exhibition for especially for mining industry, GN showed the 9 inch decanter centrifuge there and many visitors came to GN booth showing great interesting to this unit.
9 inch is the smallest size model in GN’s decanter centrifuge production line. GNLW223 is the typical model number of this size, now both the fixed speed and VFD model available. At this time, all GN’s decanter centrifuge is electric driven; however, GN is researching the FHD model that is more preferred as less energy consumption.

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GNLW223 Decanter Centrifuge – 9 inch

GN 9 inch decanter centrifuge unit can run normally at 3800 RPM for long time working condition, while the designed maximum RPM is 5000. GN’s dynamical balance testing instrument can test the decanter centrifuge at actual working speed, even the maximum designed RPM. This ensures the stable working performance.
GNLW223 series decanter centrifuge is mainly used for small capacity solids removal project. Diamond core drilling is a typical industry that will use this type decanter centrifuge. With a high working speed, the centrifuge unit would remove the ultra fine solids like less than 5 microns from the drilling fluids. Ceramic tiles are inlayed for protection of the screw propeller, which extends the working lifetime. For the customer who prefers the FHD model, GN also provides only the mechanical part like bowl assembly and bearing seat, customer could equip the hydraulic driving system and electric control system locally.
Some mining operators would ask put a shaker unit before the decanter centrifuge, thus the coarse solids could be removed firstly. Then the slurry with fine solids will be fed into the centrifuge. The function of the shaker is to remove most of the large size solids, which will greatly reduce the working load of the centrifuge. It is also a protection on the centrifuge unit.
Now GN already developed the compact solids removal unit including mini shaker and 9 inch decanter centrifuge. This system also has mixing system for adding bentonite into the fluids. Its compact structure make it could be helicoptered to lift to a remote area for working.

GN Solids Control is the 1st one manufacturer in China who ever sent the drilling cuttings solidification unit to client’s jobsite. It was predictable that many comments regarding the performance of GN solidification unit would come back. More important is how to response to these comments.
GN is always keeping developing new products, which is the reason of the first unit drilling cutting solidification unit coming from GN. Some of the comments on GN solidification unit are positive, while some are very good suggestions for GN to perfect the design. The unit sent to site was designed whole assembly installed on one skid, which makes the unit too long to move and locate the unit easily. The new design divides the machine into 2 parts; one is for solidification agent storage, the other part is for mixing. These 2 parts could be located more freely according to the site space. Comparing with old model, the new one has larger tank for agent storage, on top of the tank, hand rails are installed. The agent bag pallet could be put on top of the tank, which greatly increases the working efficiency. Though 2 parts, the whole system still could be put into one 40ft container for oversea transportation.

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Cuttings Solidification Unit

The drilling cutting discharged out of the shale shaker and decanter centrifuge could be fed into the solidification unit for treatment. However, there is a misunderstanding on the performance of the solidification unit: No matter how wet the cutting is, so long it is fed into the solidification unit; the dry material will come out. This is not correct. The much wet the cutting is, the more solidification agent will be used. Hence, the operator should make the cutting as dry as possible before feeding into the solidification unit.
GN’s solidification unit was proved greatly saved the man power on site as it can working continuously, the speed could also be adjusted as per the working condition. Solidification unit is one of the final solutions for water base drilling cuttings. Easy operation and maintenance are its advantages.

Diamond core drilling is a type of drilling used to get the stratum samples so that the geological experts could analyze what under the ground, and if there is mineral reserve, how deep need to be drilled for exploitation. Diamond core drilling always uses tube type drill bit for getting a cylinder earth sample. The drill hole is not too big to use plenty drilling mud. However, on consideration of environmental protection, the recycling of the
drilling mud is firmly requested, which is also a method of cost saving.

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GN Solids Removal Unit for Diamond Drilling

The drilling mud recycling system of the diamond core drilling can also be called as solids removal unit. As the drilling site of diamond core drilling is always space limited. The solids removal unit needs to be as compact as better. GN has 2 equipments that are made especially for diamond core drilling: Mini shaker and Mini centrifuge unit.
GN Mini shaker is 2-panel screen design with vibration G force up to 7.1 that is used to remove the coarse solids in the drilling fluids. Heat treatment on whole shake deck greatly strengthens the deck to ensure a better performance on drying the solids.
GN Mini centrifuge is 2-phase type for solids and liquid separation, 9 inch bowl diameter, with speed up to 3800RPM, the centrifuge could effectively remove the solids with size of 2 microns in the mud. Stainless steel material of the bowl guarantees the good working for all kinds of chemical liquid. The protection of tungsten carbide tiles on screw and ceramic casing at solids discharge port significantly extends the life time of the centrifuge.

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GN 9 Inch Centrifuge

The mini shaker and mini centrifuge could be ordered separately as well as included in GN’s solids removal unit. By fixing the shaker and centrifuge unit on a tank, GN could provide clients a very compact mini mud recycling system-SRU. GN SRU can also do the job for re-configuration the drilling mud. GN also has modular type solids removal unit which is transportable by helicopter to remote area.
GN solids removal unit could greatly decrease the solids content in drilling mud so that to make the drill bit down hole perform well. It could greatly reduce the consumption for water and drilling mud, which is a large saving and benefit for environment. GN now has brochure especially for solids removal unit, any interests, please feel free to contact with GN.

To be a professional manufacturer for solids control equipment, GN has nearly 10 years experience on decanter centrifuge research and fabrication. With these years development, GN decanter centrifuge have been supplied to the many giants in the oilfield industry. Subsidiary company of Halliburton, Baker Hughes, COSL and some other world famous company tried GN decanter centrifuges and gave good remarks.
A company has to keep improving if he wants to live for a long time. GN is an example for continuously upgrading the existing equipment and developing the new products according to the market feedback. At the beginning of foundation of GN Solids, GN only made middle speed decanter centrifuge that can only be used in normal drilling fluids recycling system, like barite recover process and some high speed unit could be used in fine solids separation. The middle speed model and high speed model will be kept in the same one mud recycling system.

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GN Decanter Centrifuge for Baker Hughes

Thanks to the many kind clients’ feedback and valuable suggestions, the only thing GN did in the past years was to perfect the design of the centrifuge and improve the quality. Nowadays, GN’s 4th generation decanter centrifuge is under design processing. The best seller of GN C version decanter centrifuge could be electric controlled as fixed speed or variable speed. The PLC design high standard positive pressurized control cabinet is available. Top quality centrifuge bowl material duplex SS2205, optimized feeding direction and high standard material for solids discharge touching parts make GN decanter centrifuge could be adopted in waste cuttings management system, drilling fluids de-watering system, and crude oil tank bottom sludge cleaning out of solids control system. In the past two years of winter of oil business, it was widely application of GN’s decanter centrifuge that brought GN many orders which kept GN alive, even became bigger than ever before.
GN’s second facility close to HQ will be launched into use very soon. This facility is specialized used to develop centrifuges. Most industries could be a GN’s future market like the sewage treatment, environmental projects and food industry. Actually, it is because many inquiries coming from these industries, which urges GN to expand into these areas. Where there is a request, there is a market.

GN’s decanter centrifuges are 2 phase type and mostly used in oilfield for drilling fluids fine solid particle separation and waste management as GN is known as a China leading professional manufacturer for solids control equipment for oil & gas industry. However, according to the working principle, the centrifuge should be able to be used in some other industry for liquid and solids separation just like the dredging slurry separation and construction site solids removal.
GN ever sent one solids removal system including shale shaker and decanter centrifuge to London for the construction project there. On the construction site, the worker may use water to wet or mix some construction material. Nowadays, most of the office building has parking area at the ground floor of the building. When the beginning of building, the workers will operate the rotating drilling machine to drill some holes on the ground for piling. This type of drilling will also need water for cooling down the drill bit and take out the drilling cuttings from bottom of the drilling hole.

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Solids Removal Unit

GN’s solids removal system is used to separate the solids and liquid. On construction site, it will be used to remove the stone and other large size solid particles from the water. The unit sent to GN’s customer in London was a 2 phase solids control system. The configurations are as below:
1 unit shale shaker with 3-panel screens for primary solids control could remove most of the large size solid particles. The solid particles on construction site would be various from sand, stone, leaves and waste cans. The shaker could remove almost all the coarse particles by using the wire mesh screens.
1 unit decanter centrifuge with speed up to 3200 rpm is used for fine solids separation. GN’s centrifuge is made of excellent material on bowl and screw propeller for long lifetime and easy maintenance.
1 mud storage tank is divided into two compartments for sand trap under the shale shaker and clean liquid collection under the centrifuge. 2 pumps are installed on the tank skid. One of the pump transfers the slurry from sand trap compartment to the centrifuge, another one is used to transfer the liquid out from the tank for reusing.
GN’s mud tank system is with the CE certificate thus the clients from Europe could use GN’s mud system freely without worrying about the compliance. For any request, welcome contact GN for more information.

Most of the horizontal directional drilling mud system is not equipped with decanter centrifuge unit as by using the 3-phase separation system including shale shaker, de-sander and de-silter unit, it can work good enough for removing the solids from drilling fluids. Centrifuge is relative high cost, which is also a reason the drilling contractor doesn’t equip it in the mud system.

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GN Centrifuge System

However, for some high request drilling condition, the driller may use the heavy mud for better drilling performance. Sometimes the drillers add the certain chemicals to make the drilling mud heavier so that the mud can better protect the wall of the drilling hole. If the driller went to drill another well, the heavy chemicals need to be separated, and then the centrifuge could be used to do this job. In some other conditions, after many times recycling of the drilling mud, there is much ultra fine solid particles that cannot be removed by the shaker and cyclone unit, and then the centrifuge unit is needed.
GN Solids Control has nearly 10 years in fabricating the drilling mud system for HDD projects. This type mud system need to be compact structure and easy for transportation. See the picture in this article, both the de-sander and de-silter unit are equipped with under flow shaker for drying the discharged solids. The shakers used are 2-layer screen design. The bottom layer screen is used as primary shaker and upper layer screen to dry the discharges out from the cyclone units. This design greatly reduces the footprint of the mud system. And all tank top surface equipment are pre-installed on a frame with same base dimension as storage tank. When transport the mud system, the shaker and decanter centrifuge units could be removed by lifting the frame for fast disassemble. With the frame, the equipment could be easily transported by flat bed trailer.
GN can provide both standard and customized HDD mud system for clients. Just send us your request, and then you will get a satisfying and cost effective solution.

In drilling mud solids control system, pumps are used to transfer the drilling fluids from one machine to another. Submersible slurry pump is one type pump installed vertically on mud tank or mud pit. In GN designed solids control system, this type slurry pump is often used in HDD project and feeding to centrifuge wherever it is used.

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hdd mud system

Submersible pump used in HDD mud system

GN has standard model of HDD mud system ranging from 200GPM to 1500GPM. All the models are compact structure. The used drilling fluid in this horizontal drilling comes out from the drilling hole and accumulates in a mud pit. It requests a pump to transfer the drilling mud to the mud system. Above picture perfectly shows the how the submersible slurry pump is installed vertically on the mud pit to transfer the drilling mud to the shale shaker in the HDD mud system. As this pump is installed out of the mud system, when making the quote to clients, GN always recommends an independent submersible slurry pump as an option.

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slurry pump

Submersible pump used as centrifuge feeding pump

In an oil and gas drilling mud system, after treated by the de-silter cyclone, the drilling mud will be pumped to decanter centrifuge for fine solids separation. Vertically installed in mud tank will ensure a larger tank compartment capacity for more drilling mud storage.
GN’s submersible slurry pump is single stage single suction type pump that is usually used to transfer the slurry with larger solids content. There is no bearing and gland seal between impeller and pump body; hence the slurry pump is maintenance-free and high temperature resistance. Submersible slurry pump is an ideal equipment to transfer the mud to centrifuge and HDD shale shaker. Besides, it can also be used to feed the de-sander and de-silter.