A lot of clients are asking for ViST Vacuum Shale Shaker Screen Technology to GN solids control, now the technology is already available to sell, pls contact with GN sales engineer to get more information, and understand more from the video : http://www.gnsolidscontrol.com/vist-vacuum-screen

The basic technical specification is as below:
Item Specs
Supply Air Pressure 0.7-1.0Mpa (100-150PSI)
Air capacity required 4.5 m³/min (160 CFM)
Operation Shaker For 2 -3 Shakers
Applicable Mud OBM,SBM,WBM
Recovery efficiency 30%-50%
Mud Temperature -15 +85°C
Control System Air operated Automatic control
Time for Suction Adjustable per drilling conditions
Dimension (Weight) 840x640x1050mm ( 400KG )
Electrical Power No required, only need Air supply

Based on different site schedule, the installation of Vist vacuum shaker screen unit have 2 ways: 1) it is installed externally of the shale shaker, there is one pipe to connect to the last shaker screen of the shale shaker; 2) it is installed under the last shaker screen of the shale shaker when there is enough room.

The purpose to install the vacuum is to reduce drilling waste:
1) Reduce the volume of drilling waste, the drilling cuttings will be much drier, the fluids on the cuttings is reduced 30% to 50%, so the further drilling waste treatment cost is much cheaper, or the transportation cost of drilling cuttings is cheaper
2) Increase the drilling fluids recovery efficiency, save the cost to prepare new drilling fluids
3) Save the cost of the client to buy more equipments, such as drying shaker, shaker screens, vertical cuttings dryer, etc, also save the space to install these equipments

Recently GN solids control shipped 8 sets of shale shaker without vibration motor shipped to our clients, the client will install the vibration motors by themselves who had installation capability. This is not the first order from this client, they repeat orders because they are satisfied with the working performance of GN shale shakers which they ordered before.

Shaker deck is the most esscential components for a shale shaker, the bottom material treatment before painting, we owns our ball blasting machine, the ball blasting degree is 2.5 with working life 10 years more, we can control the bottom treatment quality better, unlike other solids control manufacturer in China, they use sand blasting which is provided by third party supplier. 3 layers painting and coating by choosing Japan Kansai or US ppg brand painting, to promise the shaker deck not to get rusty and abrasion during the operation. In some tenders, it required the complete the shaker deck( all the vibration and non vibration components) are made of stainless steel material, it will increase the shaker production cost a lot and the the client has to pay more money.

The deck bottom of GN shaker is made of stainless steel material, and the unique rubber sealing technology to ensure the reliable performance of the rubber sealings, we also use GN own made composite material shaker screens, the working life is 2 times compared with the traditional steel frame shaker screens.

Model choice of fluid shale shaker

The shale shaker is choose by the following facts:
The handling capacity (GPM)
The type of fluid, the ratio of the mass density, the speed of flow and temperature
salt and/or acid of materials (Confirm to use 304# stainless steel or 316L stainless steel)
Size of the solids material and screening accuracy needed
The sums of meshes (API)
The placed-area size to place the shale shaker in oil field

The set-up of shale shaker

When first commission the shale shaker, keep put the shaker on a horizontal base. The base needs to be firmed.

The shock-resist rubber material should be installed between the working table and equipment.
Remove the shipping brace like bolts and lugs because the base and screen box are connected by springs, so when ship, the above part of the equipment is secured by the shipping braces.
Do not turns on the equipment before remove the shipping braces.
The cables connected the vibration motors on the shale shaker always damaged during severe vibration. Protected-cover for the cable is provide and need to install with cable when connect control panel and the motors.
When stop using the shale shaker, the shale shaker screen should always is washed by clean water.

The installation of shale shaker screens

Clean the adhesive side well and put on the shaker screens.
Install the wedge blocks at the two sides at the same time.
Do the test-run after the installation of shaker screen to ensure installation is done properly. If there is any unusual noise of poor contact, stop immediately and recheck the installation of shaker screens.
The tilt-angle adjustment of screen box

When the volume of fluid running is too large, the mesh screen should be changed. When fluid running is small, the angle should be adjusted by tilting.
The angle of the screen should be tilted according to the actual demand. The adjustment range is -1 to +5 degree. When adjust the tilt-angles, take off the pin first, loosen rings screws, then run the manual and/or electric hydraulic pump.
When the shale shaker properly works, the fluid should flows 3/4 of the whole screen, if the fluid can not flows as much as required, in order to increase the effect of cleaning, the shaker screen should be changed.


GN Solids Control is a world-famous company specializing in manufacturing drilling mud solid control and waste management and recycling. Its product range covers shale shaker, desander, desilter, vacuum degasser, decanter centrifuge, cutting dryer, centrifugal pump, screw pump and so on. Its products are mainly used in oil and gas drilling, civil works(like piling, TBM, HDD), and mining industry.


In the oil and gas drilling application, there is one important equipment in the solid control system, that is vacuum degasser. It is usually used after the shale shaker and before the mud cleaner. The main application of the degasser is to eliminate the gas immersed in the drilling mud, which will help restoring the mud weight, stabilizing the slurry viscosity, reducing the drilling cost, and preventing the well blow out accident. The vacuum degasser is mainly composed of vacuum tank installed on a skid base, vacuum pump, gas water separator, control panel, explosive proof motor. Its working principle is that: under the effect of the suction power from vacuum pump, negative pressure zone will be generated in the vacuum tank, and the drilling mud will enter the hollow shaft of the rotor through the suction tube under the effect of the atmospheric pressure. Then the mud will hit the windows of the hollow shaft and be sprayed to the wall of vacuum tank. Under the collision effect of the separation baffle, the mud will be separated into thin layers, and bubbles immersed in the mud will be broken up and comes out. The gas will be discharged by the vacuum pump and gas water separator to the safe zone, the mud will be discharged outside of the tank by impeller. In the whole process, the rotor will keep running at high speed under the power of main motor.


Now GN has two kinds of vacuum degasser: GNZCQ270A and GNZCQ360A, the processing capacity for these two equipment is 270m3/h and 360m3/h. Welcome to visit www.gnsolidsamerica.com

For centrifuge,explanation of noun/differential is important topic of choose and using centrifuge,the separate speed and result will effected by them

Will use GN’s centrifuge as sample if need do math

Explanation of Noun

Separation Factor: Ratio between centrifugal force and gravity of the suspension liquid or emulsion in centrifugal force field, namely ratio between centrifugal acceleration and gravity acceleration.

Separation Force design formulas:

Example:When the rotation speed of GNLW363C is 3130 RPM, the separation factor is 1973. While when the rotation speed of GNLW453C is 2800 RPM, the separation speed is 1973. We can see, when same separation factor, the larger the bowl diameter, the lower the rotation speed.

Differential speed is the speed difference between centrifuge bowl and the screw conveyor.

To get best separate result,control bowl speed based on feed different material will be very important

Effect of adjustment on technical parameters

In actual work, the solid content, solid particle size, viscosity of the slurry would be changed. Operators would choose the suitable centrifuge parameters according to the request on treated liquid and solids, capacity and so on.

Control of separation factor

Generally speaking, the larger the solids particle is in liquid and the larger the density, then the lower of the separation factor. Conversely, higher separation factor is required.

Adjustment of liquid pool

When the feeding rate is fixed, the deeper the liquid pool is, the solids will stay longer in the liquid pool. Then more solids would be separated out. On the other hand, the deeper the liquid pool is, the less fine and perturbed solids would ran away with liquid.

In the other way, a deeper liquid pool will make more clean liquid. However, the deeper liquid pool will reduce the drying area of the centrifuge, thus the solids would be with more moisture. Operator should weigh the liquid cleanness and solids dryness when adjusting the depth of liquid pool. Unless the dewatered solids will be incinerated for further disposal, in normal condition, very dry solid is not necessary. While the much cleaner liquid is desired, so, operation should adjust the liquid depth as deep as possible.

With more question about centrifuge,please contact GN solids control