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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

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.

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.

The business of today’s GN has been divided mainly into 2 scopes, one is the normal drilling mud recycling, and the other is the waste management including the waste coming from petroleum related and other separation industries. This blog is mainly talking on the drilling mud recycling system that used in non oil drilling industry.
In oil drilling, the drilling depth and safety regulation request large drilling mud storage and more solids control equipment. Thus, the mud recycling system is always equipped with degasser unit and large volume mud tanks.

Comparing with the mud recycling for oil industry, the unit for non oil drilling is more compact and less equipment needed.

• Trenchless/No Dig HDD project – The mud recycling system used in this type drilling is matching with a No dig rig. In some project for long distance pipeline and cables laying underground, it is inconvenient to dig an open groove on the ground as that will interrupt the normal traffic. The trenchless is an ideal choice. The mud recycling system for this project is always consisting of 3 stages separation as shale shaker unit, de-sanding and de-silting cyclone.
• Piling is the main method to install the bridge supporting pillar. A de-sanding unit with a small tank would be enough to remove out the coarse solids from the drilling fluids. The de-sanding unit is a composition of de-sander cyclone and shaker unit that can separate out the solids with size of 40-70 microns. Piling does not request very clean mud; less equipment involved makes the recycling unit for piling is very compact.
• GN also can manufacture the mud recycling system for tunneling project. For micron tunneling, GN has model available with capacity of 120m3/h, 240m3/h and 500m3/h. For large flow rate request, GN has the mud plant GNMS -3600M with treating capacity of 3600m3/H.

Besides, GN’s mud recycling system can also be used in water well drilling, coal bed methane exploration, dredge slurry separation and the mining flushing waster cleaning process.

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.

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.

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 was founded as a manufacturer of solids control equipment that used in drilling industry. Drilling fluids was used to lubricate and cool down the drill bit, and it can also bring out the drilling cutting from inside of the drilling hole. The working principle of solids control equipment is to remove the solid phase from liquid phase by various methods, mostly using screen technology and centrifugal separation. Thus the solids control equipment are more and more used in some other industries where need separate the solid from liquid.

High pressure water for mining is one of the industries that can use the solids control equipment to increase the working efficiency. The mining worker will use the high pressure water gun to flush the mineral ore, thus the mixture of ore, silt and water will collected in a pit. High pressure washing will reduce the silt content on the ore, thus the more pure ore could be obtained.
Ore and water slurry would be firstly fed to a coarse shaker for large size solid particles separation. Then de- sander and de-silter would be used for much finer solids separation. The extreme fine ore particles may use decanter centrifuge to separate. Decanter centrifuge is an ideal choice for slurry separation, as the centrifuge is working by centrifugal force, water, silt and ore particles have different specific gravity, which would make the separation much easier.
The worker will get different ore from each stage of solids control equipment. The more important is large volume water is recovered. This greatly reduces the consumption of water. The recovered water could be used again and again.
Nowadays, GN solids control is not only a manufacturer of solids control equipment, but also a separation solution provider. For a example, GN developed the centrifuge for food and beverage industry.

Some oil refineries store the crude oil in cylinder tank and clean the tank regularly. The tanks are cleaned and the oil sludge would be taken out with solids in it. The sludge cannot be discharged directly to environment, as it has large content of valuable oil, moreover it will pollute the environment.
Can the solid and oil could be separated and recycled. Absolutely they can. The solids and oil are 2 types of material with different density, which makes the solids easily separated by the decanter centrifuge. GN has a sludge treatment system is especially for oily sludge separation. This system is consisting of 3 parts: storage, mixing and separation.

The whole system is mounted on one skid, at one end of the skid. A square tank is used to collect and store the oily sludge. Always this tank compartment will be equipped with an agitator to prevent the solid sedimentation. As the solids in the sludge are really fine that cannot be removed out by only use the decanter centrifuge. The flocculation agent is needed to gather the fine solids and become large size block. GN’s sludge treatment system has automatic dosing system for flocculation agent mixing. The configured mature chemicals will be fed into the tank, once blocks got, the sludge will be transferred via a pump to the decanter centrifuge for separation.
Solids discharged out of the centrifuge will be collected by the screw conveyor and delivered to some catching box waiting for further treatment. The liquid coming out from the centrifuge includes water and oil, as the oil tank is cleaning by using the high pressure flushing water. This water and oil mixture has to be further treated by an oil water separator or a 3 phase decanter centrifuge.
Decanter centrifuge is the key equipment in the oily sludge treatment system. GN has already enriched the centrifuge production line from 9 inch to 30 inch. The centrifuges could be respectively for mining slurry separation, oily waste treatment, and dewatering system even some other industry like civil waste water treatment.

Besides of the drilling industry, the decanter centrifuge could also be used in some other industries such as the waste water treatment. The sources of the waste water may include dirty water in river or lake, civil sewage and the waste water from paper mill. For this kind waste water treating, some operator will also use the machine of filter press which is also an efficient machine to separate the solid from the water and get dry mud cakes.
Decanter centrifuge and filter press are different working principle on remove the fine solids from waste water. Filter press use the fine mesh, while the centrifuge by centrifugal force. However, purpose is the same just by adding the flocculation agent to make fine solids become large size blocks that can be easily separated. Filter press need more polymers when working, while decanter centrifuge use less, some material like even no need polymer if separated by using a decanter centrifuge. This will save the cost on polymer.

Decanter centrifuge is a type of machine can work continuously without flushing, only before fully stop the machine, the operator need feed clean water to flush inside of the centrifuge bowl. If use the filter press, the operator need flush the filter mesh frequently, this is really a large consumption on water. With the advantage of easy operation, one operator can operate and monitor 2 or 3 unit centrifuges at the same time. While one belt filters press may need 2-3 operators at one time. Decanter centrifuge will save a lot on the labor cost.
From the structure, the decanter centrifuge is designed compact enough with a small footprint, while the belt filter press will need large space to put it. To some small workshop with limited area, a decanter centrifuge will be a better option.
GN now have 22 inch decanter centrifuge could be used in water treatment; it can be supplied with polymer dosing system. GN now is developing much bigger centrifuge with 30 inch bowl that could be used in some other industries.

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.

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.

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.

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.