Sep 30

GN Sold two more 30 inches Decanter Centrifuge to US Customer. A solid bowl centrifuge (also known as decanter centrifuge) continuously separates solid materials from liquids in the slurry and in the wastewater treatment stage plays a very important role. In the whole mud system, decanter centrifuge is the 5th purification equipment. There is a differential speed between the decanter bowl and the scroll, which is created by a gear unit on the industrial decanter centrifuges. The differential speed determines the solid content in the outfeed. GN decanter centrifuges not only easy to install and can be fast to starting up and shutting down but also needs small space operation.GN Solids America LLC has 5 different sizes of Decanter Centrifuge from 9, 14, 18, 22, and 30 inches. Five areas that give GN Decanter Centrifuges advantage competitive advantage in the Solid Control industry.1. Patent horizontal design with SS2304 casting and build for long life usage. 2. Safety locking system for safety awareness. 3. Easy to maintain 4. Designed for a variety of applications 5. more process flexibility and higher levels of performance. GN decanter centrifuges range of applications such as 1. Food Processing (wine, fruit and vegetable juice, coffee and tea, Animal protein) 2. Petrochemical/ Oil (Refining, Dewatering, oil well drilling, Waste oil stream recycle) 3. Waste recycling (Cleaning of wash water, Municipal wastewater )4. Fish Processing (Fish meal, Fish oil)5. Chemical (Herbal medicines, Chemical extraction) 6. Mineral processing (kaolin clay and calcium carbonate)7. Organic chemical industry (Organic intermediate and end products)8. Polymer industry (Thermoplastics for example PVC, synthetic rubber and fibers)9. Inorganic chemical industry (Bleaching agents, Acids, silica products).  GN decanter centrifuges sold worldwide because of extreme performance, reliability, and cost-effectiveness, they are functional, durable and take on key functions in many different industries.201909301720


written by Decanter Centrifuge

Sep 06

We discussed about dark colored centrate.

In the optimization of decanter centrifuges, there are other considerations.

  1. Gray, forming centrate
  • Sometimes the discharged centrate carries gray color, and sometime with foams on it. Dosage of flocculants needs to be adjusted according to accommodate the changing solids concentration
  • Optimization of liquid ring. When decanter centrifuge is in operation, there is a liquid ring on the wall of rotating bowl. A thin liquid ring means dryer solids
  • The strength of flocculants. When flocculants comes into rotating bowl, its relative speed to solids rotating together with the bowl is the rotating speed of bowl, which can be a big number. The flocculants needs to be accelerated to this speed. In order to accelerate, flocculants particles will be exerted a strong shearing force. The flocculants needs to be strong enough to withstand the huge force and will not collapse. Some companies have developed some kinds of strong flocculants;
  1. Low dryness

Solids dryness depends on many factors. Below is a summary of the impact of different parameters on the dryness of solids

  • If feed flow rate is lowered, solids dryness increases;
  • If flocculants flow rate increases, solids dryness increases;
  • If auger torque increases, solids dryness increases;
  • If differential speed decreases, solids dryness increases;

Factors impacting solids concentration of discharged liquid:

  • If feed flow rate increases, solids concentration in liquid increases;
  • If flocculants dosage decreases, solids concentration in liquid increases;
  • If auger torque increases, solids concentration in liquid increases;
  • If differential speed decreases, solids concentration in liquid decreases.

It can be seen that it is impossible to optimize the performance of decanter centrifuge without some kind of automation. And all the influencing factors needs to be taken into the algorithm to make performance optimization. Field optimization is much more complex than what we can see on paper.



written by Decanter Centrifuge

Aug 16

Decanter centrifuge is a very important processing tool in a wide scope of liquid/solid separation situations. The solid-bowl scroll-discharge centrifuge (which is usually called decanter centrifuge) is the workhorse of a wide range of liquid/solid separation activities in different industry sectors including mining, oil & gas, vinery, wine, chemical industry, etc.. In environmental protection decanter centrifuge can effectively perform dewatering of waste sludge, an important application of decanter centrifuge. Because of this application decanter centrifuge is recognized well and is considered an indispensable piece of equipment in the industry. GN Solids Control manufactures full series of decanter centrifuges, from 9” to 30”, to meet the needs of different application of many industrial applications.

In theory decanter centrifuge is a relatively simple machine. However in the manufacturing process it is far more complex than it is thought. Usually the rotating assembly contains a bowl rotating at very high speed (sometimes as high as 10K RPM) with an auger (or also called screw conveyor). Slurry is pumped into the rotating assembly by a pump through a feeding tube, clarified liquid decants out from one end of the rotating bowl and the separated solids is moved to the other end of the rotating bowl and discharged out from exiting opening. The biggest advantage of decanter centrifuge is its ability to separate high concentration of solids from liquid at pretty high throughput speed, with small liquid left in the separated solids. Decanter centrifuge can handle very high solids concentration, sometimes as high as 80% of liquid volume. Decanter centrifuges made by GN Solids Control work effective well. Solids discharged from GN Decenter centrifuge contains very small amount of water that the solids can be stacked without much seepage from the solids. However there is a lot of consideration to be made for the decanter centrifuge to perform properly and there are a lot of variables to consider when designing one system.18-inch-decanter-centrifuge


written by Decanter Centrifuge

Jul 26

GN Dewatering System Sold to Canada, customer use for slurry waste solutions. Slurry Categories as follow 1. Directly drilling soil from non- contaminated job sites 2. Hydro slurry from non-contaminated Hydro excavation requires less labor than conventional digging methods. After vacuum and roll off truck finished, GN the Dewatering system will be perfect solution for it.

The Dewatering System included

  1. Feeding hopper with High G shale Shaker model number GNZKR-1230 capacity 10-150t/h Storage tank size 3800 x 2200 x 1512 mm with 2 agitators both 5.5kWand 2 Slurry pump one is 22kW another is 5.5kW both pump control by the VFD system.
  2. HDD CBM Shaker tank

GN Double Deck Finder Shaker model number GNZS706 E with 140 m3/h (616GPM) capacity 6 pcs screen with adjust angle -1~ +5 degree. And GN desilter model number GNZJ594E-12N 120m3/h (528GPM) capacity 3 pcs screen with adjust angle -1~ +5 degree. One Slurry pump with a 22kW motor with Shaker and desilter tank size 10369 x 2100 x 2312 mm. 2 agitators with 11kW.

  1. Decanter Centrifuge

GN GNLW553C-VFD 22 inches (550mm) decanter centrifuge, capacity with 90 m3/h (400 GPM) support   with screw pump GNG60A-150 15kW capacity 60m3/h. Centrifuge skid not only supports the centrifuge but also can adjust the height. Under the centrifuge come with storage tank and transfer pump model number GNSB3X2B -7.5J flow rate at 30m3/h (132 GPM) motor power with 7.5kW, the speed with 1450 rpm

  1. Dose Machine

This comes with 3 compartments with 3 set agitator can automatic powder chemical dosing. Capacity 2000L/Hour, Tank Volume 2000L, Hopper Volume 45L

For more information please contact GN sales representative at Web:

Add: 6710 Windfern Rd, Houston, TX 77040



written by Decanter Centrifuge

Jun 13

GN Solids Control is strong brand for the manufacturing of decanter centrifuge in China.

Decanter centrifuge decants solids continuously from liquid by a auger inside the rotating bowl to flow out from solids discharge holes. It is widely used in different industry sectors for separation purposes.

Decenter centrifuge comprises of rotating bowl, auger rotating at differential speed and gear box. Some model use variable frequency controllers to control the speed of both the bowl and the auger, to control their absolute rotation speed, and to control the differential speed between the bowl and the auger.

Its working principle. Once slurry comes into the rotation bowl, it will be facing the intense centrifugal force generated by the rotation of the bowl. Usually solids are heavier than liquid and stronger centrifugal force is applied to solids, and thus pushing them toward the wall of the bowl, and the lighter phase (liquid) is under less centrifugal force and thus it “floats” on top of the settled solids, forming a liquid layer. As there is a differential speed between the rotating bowl, and the rotating auger, deposited solids will be pushed towards slowly towards cone side of rotating bowl, continuously flow out from discharging port.

GN Solids control has long history to manufacture decanter centrifuge and its decanter centrifuge is used in ten of countries playing an important role in solids control of oil and gas drilling process.

In the oil and gas drilling process, there is a big challenge for decanter centrifuge as the concentration of solids changes tremendously. And the existence of hard particles generates serious wear on equipment. Also drilling mud go through different solids control equipment. These equipment perform in very different ways, making the situation very complex. It is extremely difficult to maintain decanter centrifuge in overall optimized performance.

In order to handle these challenges, GN Solids Control performed sound research and development work, and invested a good sum of money into it. The result is a series of decanter centrifuge with outstanding performance.

  1. GN uses duplex stainless steel, which is much stronger than regular 316 stainless steel. This allows GN Solids Control to manufacturing decanter centrifuge with much higher rotation speed and thus much higher separation coefficient. The other advantage of duplex stainless steel is strong resistance to wear, making decanter centrifuge by GN Solids Control last much longer than those made of regular 316 stainless steel;
  2. Technique employed to manufacture the bowl. GN Solids Control uses centrifugal casting technique to make the bowl of decanter centrifuge. This technique generate a much uniform distribution of stainless steel mass and a much reduced challenges in balance the bowl, and the balancing of whole system;
  3. GN Solids Control extends speed range of bowl balancing to both the bowl & auger themselves. GN performs low speed balancing, medium speed balancing and high speed balance for both of them to ensure these two critical rotating parts are well balanced throughout the speed spectrum. And this whole speed balancing is also performed on the rotating assembly. This allows smooth and quiet operation of decanter centrifuge by GN Solids Control;
  4. GN Solids Control also use tungsten carbide to enhance the life of all parts prone to wear, including solids discharge port, auger blades, end of auger, and any parts that are exposed to strong solids flow. All these significantly extend the life of GN decanter centriguge;
  5. GN solids control also performed in-depth R&D work and developed a control system which control the operation of decanter centrifuge. It uses advance algorithm to predict the performance of decanter centrifuge and adjust system operation parameters in a timely manner, this greatly enhance equipment performance and reduced down time.


Field application shows that with the support of all the above mentioned technology, decanter centrifuge by GN Solids Control outperforms decanter centrifuge  by famous manufacturer, which is a few times more expensive than GN decanter centrifuge.

GN is the right name for you to choose in solids/liquid separation challenges.22-inch-decanter-centrifuge


written by Decanter Centrifuge

Jun 29

Oil and Gas Industry is changing its pace every year, from conventional drilling to unconventional drilling to pad drilling. So the industry traditional mud recycling system is gradually replaced by automatic, systematic and close-looped mud recycling system. More drilling contractors have equipped cutting dryers with their mud processing system. The cutting dryer can meet the environmental requirement and recover and recycle more material for reuse.

Recently we have supplier many key equipment to world’s drilling and solids control market especially in the Russian Market. We have supplied 6 units of



s, Mud cleaning system—2 systems, 6 units of Centrifugal pumps, 2 units of Centrifugal degasser, and our star equipment—4 units of our decant Centrifuge. We have find a serval good local distributor in the Russian Market to help us push our equipment, and this is one of the key marketing methods we use.

In the US Market, we have been pushing our new composite framed shale shaker screens have the follow features: the steel frame part is welded automatically by robot with higher strength and better quality conformity. The injection molded plastic is mixed with imported fiberglass and it can resists high temperature up to 140 degree, and it’s tougher, more endurable and can work under higher vibration G force. GN’s composite screens cover GN’S OEM screen, MI SWACO MONGOOSE, BRANDT VENOM, BRANDT KING COBRA, FSI, etc. GN can also customize the screens according to customer’s requirement. All the composite screens are repairable. Comparing to steel framed screens, the non blank area of composite framed screen is 10-20% more. And the composite frame is not easily to get rusted and can be stored up to 5 years.

That’s the brief introduction about GN’s new fully hydraulic drive decanter centrifuge. Welcome to visit and please send your inquiries to




written by Decanter Centrifuge

Mar 30

The centrifugal force separation principle of drilling fluid for the drilling industry.

The liquid-solid separation process of the liquid and solids parts is done by the roller of the bowl.  The proven theory of separation by driven of bowl in high speed rotating cycle that creates centrifugal force and gravity.  The drilling mud is thrown to the cylinder wall to form a circle of liquid, solid particles in the liquid ring due to greater than gravity centrifugal force in hundreds and thousands of times.  It’s overcome the mud viscosity resistance rapid subsidence to the drum wall and begins forming solid layer, the liquid formed liquid layer. The ratio of the centrifugal force and the self gravity of the solid particles in the liquid ring is the detail that separation factor of the drilling fluid centrifuge, and the separation factor of the large drilling fluid centrifuge can separate the finer particles from the slurry.

Different bowl speed creates different purpose of recovery.  A low speed drilling fluid centrifuge use as “barite recovery drilling fluid centrifuge”. The separation factor is about 500 to 700, for low density solid, the separation point for 6 ~ 10 um, for high density solid, separation point 4 ~ 7 um.

Mid-range rotate bowl drilling centrifuged separation factors for about 800, separable solid 5  um, for removing the harmful solid mud, mud density and viscosity control. This is at present the largest rig drilling fluid centrifuge.

High speed drilling fluid centrifuge factor is about 1200~2100, separation point 2 to 5 u m, for the removal of harmful solid and control the viscosity of the slurry, high speed drilling fluid centrifuge separation of solids to be discharged out of the tank and liquid return in the circulatory system.



written by Decanter Centrifuge

Mar 08

The purpose and the function of decanter centrifuge is to separate liquid our from solid and/or oil.  Some slurry which might contain materials that might cause the corrosion via contact with metal.  In the long-run of time, it will affect the work ability by decrease the performance that lead less operation time.  When corrosion starts to appear it and deal with timely matter, it can solve the problem without cause much of operation delay.

By collective feedback on the operation field, corrosion can be spot-alike and evenly -formed.  The spot-alike or random pattern-like corrosion only happened on random area.  The evenly-formed corrosion is more serious issue that might leave the decanter centrifuge out of commission pre-maturely.  Random and spot-alike corrosion often happened due to the defects on the surface of metal.  The more serious and destructive elements that contain in the slurry flow into the decanter centrifuge and without after-work clean-up, it will slowly created the hole on the metal. If the decanter centrifuge is not for conservation, the corrosion action will become more and more serious.

Corrosive wear is a relatively common -happened corrosion. This kind of corrosion is not serious spot-alike corrosion, but in the centrifuge maintenance work, it needs to pay attention to.  This wear corrosion is due to friction parts in the work. When maintenance, the bearing can give parts contact daub lubricating oil, help to reduce friction, regularly will more serious wear parts are replaced, which can effectively prevent the corrosion wear.

GN Solids America LLC has a large warehouse get to 30, 000 sq. feet. GN Solids America helps to keep many decanter centrifuges are available in Houston. GN Solids America is providing rental services for these centrifuges and the some other solids control and going waste management systems. Different kinds are optional from varying speed to fix speed.

14-inch-decanter-centrifuge (1)


written by Decanter Centrifuge

Jan 12

High noise made from machine now become part of occupation hazard for works who expose it in extend of time period.  It how have regulate by government  because the consideration of the machine design.

Decanter centrifuge is the machinery with rotating bowl and contain many number source of noise .  The size of the machine, the speed of the rotating bowl, which is the main source of noise come from structure.  Other noise like turbulence noise and siren noise is also part of noise production from the decanter centrifuge.

Structure noise often produce by all surfaces that directly coupled to the bowl’s bearing.  The speed of rotation of the bowl, it create turbulence from the different trailing edges that produce broad spectrum vortex  noise.  The siren noise is from air flow through the bowl and it produce great noise especially  at the lower harmonics of the bowl rotate frequency.

There are ways to decrease noise that produce by decanter centrifuge, some of them are:

  • Decoupling the surface of the main bearing of the rotating bowl and will reduce the amount of noise transmitted from the decanter centrifuge structure
  • Polish and smooth the bowl surface will minimize the noise produce from the edge that vortices that shed and produce vortex, turbulence noise
  • Siren noise produce because from the air flow through rotating bowl, which is the purpose to the function of the decanter, the exit opening should be design so the noise is produce within the parts of spectrum of sound have low noise level

The noise that produce from machinery is consider health hazard if personal consistently exposure on noise that is great then 80 to 85 dB over an eight hours per day.  Excess expose of level of 85 dB during work life would result 90% of people suffer lost of hearing.  It can also damage the way of speech as well.  Which now noise regulation is the must enforce regulation.



written by Decanter Centrifuge

Dec 29

Waste that is solid (typically it is drilling cutting that contain in the drilling mud) management decanting centrifuge are use to process un-weighted and weighted, water-based and oil-based slurry and widely use in chemical industry, food industry, mineral beneficiation field.  If there are demand for fine separation need in any industry, decanter centrifuge can be ideal machinery to do the task.

The large treating capacity fluid centrifuge is driven by two electronic motors. The main motor drives the drum and differential shell rotation by the timing belt. The second motor drives the spiral through the differential variable speed. The drum and spiral rotate together in the same direction, but at different speeds. It separates the solid phases in the slurry by the centrifugal sedimentation principle. The fluids is pushed into the rotor drum through the inlet pipe and under the force of screw propeller, under the effect of centrifugal force, the solid phases will be spin  onto the inside wall of the drum, pass the impeller on the screw propeller and be discharged from the open hole at the thinner side of the drum. The fluids are excreted from the overflow hole of the large end. The continuous circle like above to achieve the target of continuous slurry separation of solid and liquid. Waste management decanting centrifuge are able to apply over 3,000 G-force on the slurry mixture, which separates the heavier solids from the lighter solids.

  • Decanter centrifuge work reliable, long service life. The composers of the propellers -with thick plate, exterior wear resisting layer to ensure centrifuge use long life.
  • The main bearing imported SKF brand to ensure maximum time usage of machinery.
  • Centrifuge vibration is produce very low noise .By improving the rotational pars machining accuracy and the dynamic balance accuracy of the vibration.



written by Decanter Centrifuge