GN VFD centrifuge is made and designed for mud solids control and drilling waste management.
There are 4 parameters can be changed on GN VFD Decanter centrifuge:
1) Bowl speed: More speed, fluids more clean, and accordingly, solids more dryer
2) Conveyer speed: More conveyer speed, the centrifuge push material more fast, means shorter time for separation, more solids in fluids
3) Fluids height at centrifuge big end (the motor end): Now it is already the largest depth. The higher the fluids level, more clean of the fluids.
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4) Pump flow: according to different treating material and different performance customer want, capacity different.
Centrifuge operator can follow below steps to find out the most suitable bowl speed, conveyer speed and pump feeding flow for decanter centrifuge in specified jobsite:
Step 1 find out the most suitable bowl speed of VFD decanter centrifuge:
Fixed the conveyor speed, like 30rpm, fix the pump flow, e.g.: 10m3/h: then increase bowl speed more and more. For more speed, the fluids phase from centrifuge will be more clean. So job site operator can try from 2500 / 2800/ 3000/3200 rpm. After 10min around normal running, take sample for each speed.
Compare the different samples to find out the best bowl speed.
Step 2 find out the best centrifuge conveyor speed:
Fix the bow speed as the same with step 1 found out, fixed the same pump flow, 10m3/h. Change conveyer speed from 23rpm, increase it more and more. For every conveyer speed, after 10min, take sample.
Compare different samples and find out the most suitable centrifuge conveyor speed for the jobsite.
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Step 3: find out the biggest pump flow with best performance for the centrifuge in specified jobsite:
Set the most suitable bowl speed got from step 1. The most suitable conveyor speed from step 2, increase pump flow from 5m3/h. Increase it more and more, like, 5cbm, 8cbm, 10cbm, 15cbm, 18cbm, 20cbm, and compare the performance, to find the most suitable performance you want get.
After the 3 stages, you will find out the best performance can come out from decanter centrifuge in the specified jobsite.
Remember: Every time the treating material changed, the centrifuge operator should repeat the 3 steps to find out the new centrifuge setting suitable for the new condition.
Decanter centrifuge is a physical separation machine. If the final result cannot satisfy you, that means physical treatment not enough, you may need chemical treatment or combined with other process.
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Published: 30 August 2014
Dewatering unit is actually a mixing system for flocculant fine solids in drilling mud. The real function of dewatering unit is flocculation. After flocculation, very fine particle polymerized into bigger sizes suitable for centrifuge separation.
2 Kinds of chemicals normally be used for flocculation in dewatering unit: PAC & PAM. Chemical is dosed from hopper on top of mixing tank. Normally, customer choose 3-chamber dewatering unit.
Functions of the 3 chambers:
1# Chamber: chemical mixing,
2# Chamber: chemical Slaking,
3# Chamber: after mixing and slaking, the prepared material stocked in 3# chamber for usage.
Chemical transfer pump: suck chemical from 3# chamber and feed to decanter centrifuge.
Decanter centrifuge in dewatering unit: There are 2 feed pipes to dewatering centrifuge: One pipe is chemical feeding pump. Another pipe is screw pump feeding mud to centrifuge. Before the mud enters into centrifuge, it is mixed with flocculation chemicals.
If chemicals request a certain time to mixing thoroughly with mud, bend pipe will be used for centrifuge feeding. In this case, chemicals and mud can be mixed well before centrifuge treated.
After treated by decanter centrifuge: solids phase above 2~5 microns will be discharged from solids side. Water phase collected for further treatment.
After dewatering unit and dewatering centrifuge, fluids phase can be transferred to sewage treatment plant for further treatment. But it cannot be discharged into environment directly. As dewatering unit is a physical separation process. It utilizes flocculation function to make fine particles in bigger size, and then use high speed centrifuge force for separation. There still small amount fine solids (smaller size than 2~5 microns) and other chemical material.
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Published: 05 August 2014
Features of baby centrifuge
GNLW223 is a small size baby centrifuge. It is a decanter baby centrifuge specially designed for small capacity, small footprint, and used for fine solids separation with high speed.
Applications of baby centrifuge
This small size baby centrifuge have many applications, it can be used for drilling waste management system in some cases, the high speed is suitable for slurry separation, it is especially good for mining industry, diamond drilling and CBM drilling.
Models of GNLW223 baby centrifuge for CBM drilling, diamond drilling
1) GNLW223G: It is the basic baby centrifuge model. With fixed high speed up to 4900rpm. It is fixed speed with belt drive, means driven by electric motors.
2) GNLW223VFD. It is a variable frequency drive centrifuge with variable speed. It is control by PLC smart control system for VFD. The control panel with touch screen and bottom for operation. Just like a big Blackberry mobile phone.
3) GNLW223FHD: It is a full hydraulic drive decanter centrifuge with variable speed control. They model we cooperated with a German company for the hydraulic drive system.
Parameters of GNLW223 baby centrifuge
Max. Capacity: 150 Liter/min
Normal capacity: 100Liter/min
Bowl diameter: 220mm
Bowl length: 660mm
Beach angle: 8o
Effluent port: 6 (Ajustable)
Max. bowl speed: 4900rpm / 0~4900rpm for VFD model
Typical bowl speed: 3800rpm / 0 ~ 3800rpm for VFD panel
G-force (typical): 1770
For more information of GN baby centrifuge model or other big centrifuge model, visit GN website or contact GN Group. .
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Published: 01 August 2014
GN Solids Control company now have 2 each 14’’ oilfield high speed decanter centrifuge for sale, with 15% price off. It is brand new centrifuges make per international high standard.
Application of GN 14’’ high speed centrifuge
GNLW363 centrifuge is the most popular decanter centrifuge model for oilfield. It can be used in both mud solids control system, as well as drilling waste management system. Together with PLC smart control VFD panel, it can be used for barite recover and fine solids separation. It is the most suitable choice for LGS and HGS separation.
Parameters of GN 14’’ high speed centrifuge
Model: GNLW363G
Bowl Diameter: 360mm (14'')
Bowl Length: 1270mm (50'')
Beach Angle: 8°
Max. Bowl Speed: 3200RPM
Max Capacity: 30m3/h (132GPM)
Separation Point: ≥2microns
G-Force: 3060(Max)
G-Force: 3060(Max)
Main Drive: 37Kw-4p (50hp)
Back Drive: 7.5Kw-4p (10hp)
Control Panel: Explosion proof (EXdâ…¡BT4)
Main Body Material: SS316L
Screw Protection: Tungsten alloy tile
Solids Discharge Port: Interchangeable tungsten carton alloy ring
Why GN 14’’ oilfield high speed centrifuge for sale with 15% price off
It is exactly brand new centrifuge in stock. It is GN old design with 2 motors (main motor and back drive motor) located in the two ends of the centrifuge. From 2014, GN updated the design with 2 motors mounted in the same end of centrifuge, for a more compact design. The centrifuges for sale is the last 2 sets with old design. (Every time, GN make 10 sets centrifuge as one batch). It is made per GN high standard for international high speed, with SS316L bowl material, original SKF bearing, tungsten carbon tile for screw protection…
For more information of GN decanter centrifuge model, send mail to This email address is being protected from spambots. You need JavaScript enabled to view it. or call at +86 18632565675
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Published: 22 July 2014
Applications of GN made Drilling Cuttings Processing System
GN Drilling Cuttings Processing System can be used to treat various kinds of drilling cuttings from drilling mud solids control system, such as oil based drilling cuttings, water based drilling cuttings, synthetical based drilling cutting.
Features of GN made Drilling Cuttings Processing System
The processing system is including a vertical Cuttings Dryer and a Solids Control decanter centrifuge with variable frequency control.
The solids control centrifuge is lifted by telescopic skid. Solids discharged directly, as the skid height is higher than normal solids control mud storage tank. The clean fluids can be leaded to mud recycling tank for reuse.
There is a small transition tank between cuttings dryer and solids control centrifuge. All equipment as well as the transition tank mounted on a big skid. The skid can be the same dimension as 40ft container, can put on the trailer for fast movement.
Another side, the tank skid can be moved smaller than 40ft container and put into container for international shipment.
GN made Drilling Cuttings Processing System is widely used in U.S.A, Russia, Indonesia, Argentina, Algeria, Tunisia, Nigeria, Egypt, Romania, Kuwait, Saudi Arabia, Iraq, Oman, Qatar
For any questions regarding drilling cuttings processing system, you can contact GN group for customized solution.
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Published: 19 July 2014
A conical bowl centrifuge is shaped just as it sounds. The interior of the bowl is a cone. These were the original centrifuges used in the oilfield and some are still used today.
An advancement in centrifuge bowl design was the contour or cylindrical design. In this design, the large diameter of the bowl is kept cylindrical for a portion of the total length, then transitions to the normal angle of cone taper for the remainder of the bowl.
When comparing conical and contour bowls of the same length, several things happen. If the pool is adjusted so that the beach is the same on machines, the pool volume and therefore retention time is greater on a contour bowl. The result is that a contour bowl can handle a much higher feed rate while still making the same median outpoint, as compared to a conical bowl centrifuge of the same size.
Decanter Centrifuge Applications in Solids Control System
For drilling fulids processing there are two uses of centrifuges. One is to remove solids from the mud while returning the liquid phase to the active system, such as when used with an unweighted drilling fluid. The other is when solids are returned to the active system and the liquid phase is discarded.
For unweighted drilling fluids, a centrifuge is often used on the active mud system ot remove as many drilled solids as possible, which helps to control the weight or density of the mud. The effluent containing colloidal solids, such as bentonite and chemical additives, is returned to the active mud system. If it is an expensive drilling fluids, often the hydrocycone unders can be processed with a centrifuge to recover as much of the associated liquid phase as possible while discharging the solids.
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Published: 06 July 2014