GN Shale Shaker

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GN Sold Shale Shaker reorders to US Customer this week. Shale Shaker is knowing as the first stage and a very important machine on the rig for removing large drilled solids from the drilling fluid. Those solids removed by the shale shaker are discharged out of the discharge port into a separate holding tank where they await further treatment or disposal. GN Shale Shaker used top brand company motor so as exploration proof control panel components. Also, cover the overload and short circuit protection. GN Shale Shaker not only added a cover rubber on the spring to reduce the noise but also make the angle adjustable method easy and less human labor cost. In addition, the GN Shale shaker comes with a very informative user manual, it will help with the new operator understand the process quicker. There are 7 types of GN shale shakers. One (GNZS752) with 2 screen Panels. Two (GNZS703F-SDZF, GNZS703F-SHBF) with 3 screen panels. One (GNZS594F-SHBF) with 4 screen panels. One (GNZS706F-SHBF) 6 screen panels double deck shaker. Two (GNZS594F-SGZF and GNZS703F-SGZF) with High G force can be up to 8G of force move solids fast across GN API shaker screen. GN Shaker screen panels are tested with API RP 13C(I-SO13501). 

GN Shale Shaker sold worldwide such as the USA, Russian, United Arab Emirates, Africa, Indian, middle east. etc. Benefit gets GN Shale Shakers are 1. global customer service support 2. replacement screens are good quality with affordable price 3. Built tough with strong durable materials usage longer lifetime 4. Great for North and South America customer, GN Solids America LLC Shale Shaker has storage inventory in Houston Texas. This will help to reduce the shipping lead time and customer and get the GN Shale shaker faster.


Centrifuge Feed Pump

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GN G Series Centrifuge feed pump is a positive displacement pump, also called a screw pump. A screw pump uses one or several screws to move fluids or solids along the screw(s) axis. In its simplest form (the Archimedes' screw pump), a single screw rotates in a cylindrical cavity, thereby moving the material along the screw's spindle. This ancient construction is still used in many low-tech applications, such as irrigation systems and in agricultural machinery for transporting grain and other solids. The GNG positive displacement pump is an ideal pump for feeding to decanter centrifuge without shearing or agitating the drilling mud. The main parts are the screw shaft (rotor) and screw shaft bushing (stator). Because of the special geometry shape of the two parts, they form pressurize capacity separately. The fluids flow along with the shaft, inner flow speed is slow, capacity remains, the pressure is steady, so it will not generate vortex and agitating. The shaft of the pump is made from Stainless steel, GNG series pump is available for option with complete stainless-steel body.

Features of GN G Centrifuge Feed Pump

GN G centrifuge feed pump can drive by the coupler, or adjust the speed by using variable speed motor, Triangle V-belt, gearbox, etc. G series positive displacement pump is with fewer accessories, compact structure, small volume, easy maintenance, rotor, and stator are wearing parts of this pump, it is convenient to replace. The stator is made of elastomeric material, so it has advantages than other pumps to transfer the fluids with high viscosity and hard suspended particles included.

Another Centrifuge feed pump

GN G Series Positive Displacement Pump is the most popular centrifuge feeding pump, but for some applications, the drilling industry also uses the horizontal centrifugal pump and submersible slurry pump to feed drilling mud to the decanter centrifuge.

To check horizontal centrifugal pump here:


Discussion about decanter centrifuge optimization

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Nowadays we are quite familiar with decanter centrifuges because we can see them almost everywhere in different industry sectors. Many people also think them a very simple machine, they just generate high centrifugal forces which is in turn applied to solids so as to separate them from liquids.

However in real application there are many factors affecting the performance of decanter centrifuges and we have to take into consideration many influences to achieve optimized performance of decanter centrifuges.

We discuss about flocculants application. During the operation of decanter centrifuge we need to use flocculants to speed up the separation of solids from liquids. In field application we encounter the following situation from time to time.

  • The centrate has a lot of solids. If this happens the solids concentration in the incoming flow must be checked. For GN Solids Control, its decanter centrifuges are designed to work with highest efficiency when solids concentration is around 20%. If decanter centrifuges are overloaded, they will never work well;
  • Differential speed. Three is a slight difference between the rotation speed of centrifugal bowl and auger, usually between a few RPM to less than 20RPM. The lower the differential speed, the longer solids stay in the rotating bowl. There is a very important consideration in this differential speed, the breaking of flocculants, as they intend to break if exposed pressure for long, making them lose the ability to coagulate find particle, and having them discharged with liquid. A trial and error test can determine the optimum differential speed for that particular type of solids;
  • Another consideration on flocculants is its strength. When flocculants come into decanter centrifuge, there is a big difference speed between flocculants and the solids. Once flocculants falls on to the wall of rotating wall, there is a huge shearing force exerted on them, and they need to be strong enough to withstand the shearing force to remain as integral particles so as to attract fine particles onto them and move out of decanter centrifuge along with bigger particles.


Why decenter centrifuge’s design is crucial

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Decanter centrifuge is everywhere in the industry, it is so important that it is used almost in every corner of the industry.

Because we are familiar with centrifugal force, we take for granted that decanter centrifuge is a simple machine. To some extent it is true as it is a long barrel on a pair of bearings rotating at high speed. However, it is not that simple. Designing and application of decanter centrifuges require a lot careful planning and coorindation.

The first consideration is the inlet zone, where slurry to be separated enters into rotation bowl. The most important consideration of this part is to minimize the degradation of solids, because degradation can disturb the settlement of solids on bowl wall. Many manufacturers have particular design for specific application to make this purpose.

The second and the most important consideration is the rotation bowl. On one site it needs to be strong enough to withstand the huge centrifugal force being exerted on bowl wall. Just remember G force on the rotation bowl can be as high as 3000 G. In other words one KG of solids can becomes 3 tons heavy. If there is 500KG of solids in the rotating bowl, it would be 1500 ton heavy. The rotating bow need to be extremely strong to undertake this force. GN Solids Control uses duplex stainless steel to make rotating bowl, which is much stronger than regular 304 and 316 stainless steel.

The other consideration of rotating bowl is its resistance of erosion and corrosion. There exists big speed difference between solids and rotating bowl thus there will be potential of big erosion. Also there are numerous number of materials to be separated including some very corrosive material. Rotating bowl needs to be able to resist such erosion and corrosion to provide long service life of the decanter centrifuge.


Structure of decanter centrifuges

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30 years ago decanter centrifuge was considered high tech equipment due the challenge to cast high strength rotating bowl and control of erosion from high abrasion solids. At that time decanter centrifuge could cost up to 1 million US dollars. Any enterprises which manufactured decanter centrifuge were considered high tech company.

With advancement of technology, there is no longer mysteries in decanter centrifuge, and many people take them as granted. However one need to have at least some basic knowledge about decanter centrifuge before he can understand and operate them in a proper and safe manner.

Let us have a look at rotating bowl.

First there is an inlet tube, which dumps slurry into the rotating bowl. Please note, the material inside the rotating bowl is spinning at very high speed with the rotating bowl. Once slurry from inlet tube drops down to the wall of rotating bowl. On one side the slurry will produce erosion to bowl wall, and it also damage solids settlement on bowl wall. A properly designed decanter centrifuge can minimize this disturbing effect.

Second component is screw conveyor. This device plays instrumental role for the performance of decanter centrifuge. The more effective the screw conveyor is, the more efficient the decanter centrifuge is. Therefore it is very important to have proper design of screw conveyor. Extensive industrial experience about the pitch, angle and differential speed are the foundations for successful design of screw conveyor.

Third consideration of solids discharge section. The biggest challenge here is erosion, as there is huge centrifugal force on the solids. Depending on the feature of solids, they can be very dry like powder, or they can be like paste, sticky and viscous. Discharge ports withstand tremendous erosion and all measures should be taken to protect discharge portion to maximize their service life.