Monthly Archives: July 2017

River water cleaning and dredge slurry separation system

GN Solids Control offers customized and turnkey solutions on various kind of liquid solids separation project, like river water purification and cleaning system, the dredge slurry separation system.
Features of the river water purification and cleaning system, the dredge slurry separation system:
1) Normally, the capacity of the river water cleaning system and the dredge slurry separation system is big. Like 1000 m3/h or more. As the river water requested to be cleaned is near the life areas. They have to finish the separation job as short as possible to reduce the affect to nearby people normal life.


2) The particle size of the solids in the dirty river water or in the dredge slurry is not for sure. It normally contains unexpected big stuff, like shoes, rocks, household waste, etc…
3) The fine solids or ultrafine solids control is normally very high. They will increase the difficulty of the separation plant.
The normal equipment GN Solids Control will be used for the river water purification and cleaning system, the dredge slurry separation system:
1) Linear motion solids control shale shaker GNZS594G, or even the double deck shale shaker GNZS706E. Some time, the shale shaker is equipped with 2 kinds of shaker screens. Some batches of shale shakers are equipped with coarse screens to remove the unexpected big stuff in the dirty water for preseparation.
The second batch of shale shakers are equipped with fine shaker screen for the next step pre-separation, to remove the solids above 200 microns.
2) Mud cleaner combined with under flow shale shaker, desander and desilter. The mud cleaner is for the second and the third stage separation. The desander cone will remove solids over 50 microns. The desilter cones will remove solids over 27 microns.
3) Different sizes centrifugal pump to feeding for the desander and desilters. GN advanced design centrifugal pump is interchangeable with NOV Mission Magnum pump. It is the most popular pump design. It can be interchangeable with client’s old Mission pump. And they can use GN spare parts for client’s old Mission pump.

Mud agitator for drilling fluids tank and oily sludge tank

Mud agitator is popular and simple design solids control equipment. It is widely used in different tank systems, like trip tank, solids control shale shaker tank, suctions tank, storage tank, mixing tank, pill tank. Mud agitator is also be used in liquid mud plant in the drilling fluids tank, water tank and oil tank system.
Mud agitator is a based solids control equipment with simple design. Based on the connection type of driving motor and gearbox, there are 2 different designs of mud agitator.
Mud agitator design 1: Direct connection type mud agitator. For this kind of mud agitator, the driven motor and gearbox is connected directly on the tank. It is a compact design with small footprint and less weight.


Direct connection type mud agitator includes below major components:
1) 3-phase Explosion proof driving motor for zone 1 (Class 1 Div. 1) applications.
2) Heavy duty gearbox from famous brand
3) Agitator shaft. The length of the agitator shaft is depends on the tank inner depth.
4) Single lay or double lay impeller suits for the shaft length and tank inner depth.
5) For tanks with inner depth over 1.8 m , shaft stabilizer will be equipped to avoid the agitator shaft from swaying during rotating.
Mud agitator design 2: Coupling type mud agitator. For this kind of agitator, the 3-phase motor and gearbox is mounted on a skid and connected through a coupler. Advantage of coupling type mud agitator is that, it is easy to mount on the mud tank system, and easier for maintenance.
Coupling type mud agitator includes below major components:
1) 3-phase Explosion proof driving motor with coupler for zone 1 (Class 1 Div. 1) applications.
2) Heavy duty gearbox from famous brand
3) A mounting skid for the 3-phase motor and heavy duty gear box
4) Agitator shaft. The length of the agitator shaft is depends on the tank inner depth.
5) Single lay or double lay impeller suits for the shaft length and tank inner depth.
6) For tanks with inner depth over 1.8 m , shaft stabilizer will be equipped to avoid the agitator shaft from swaying during rotating.

FHD centrifuge VS VFD centrifuge for waste management

GN solids control brand decanter centrifuge with VFD control panel has been used by many big oil and gas drilling companies, mud service companies, drilling waste management companies. GN Solids Control equipment and the drilling waste management equipment have been exported to 74 countries and regions till now, like U.S.A, UAE, Saudi Arabia, Australia, Argentina, UK, Malaysia, Thailand, Singapore, Romania, Brazil, Egypt, Algeria, Qatar, Kuwait, Yemen, Russia, Sudan, Morocco, PNG, South Africa, Nigeria, India, Indonesia, Korea, etc…
GN Solids Control provides 2 options for variable speed control for waste management decanter centrifuge:
Option 1 is variable frequency drive (VFD).
Option 2 is full hydraulic drive control (FHD).


Normally GN Solids Control provide centrifuge with pressurized VFD control panel with air conditioner instead of FHD, the reason is as below:
1) VFD centrifuge is more convenient for maintenance and repair. Because the electric components in the VFD is standard models, most of them are from ABB/Siemens/Schneider brand, the users can source it locally if they need to replace some parts. But the FHD should be repaired by the manufacturer if it failed to work.
2) VFD centrifuge is much cheaper than FHD. Until now there is no many good manufacturer of the core components of the FHD, we have to import, which leads the production cost very high. VFD centrifuge is more popular because it is a cost-effective option.
3) GN Solids Control had noticed to fix the inverter and other electrical components inside the VFD control panel during shipment, so you can be rest assured that they will not be loosed or fall off during transportation.
4) GN Solids Control have protection inside the VFD for Voltage and Current instability when start the centrifuge, if the change of voltage/current is in a acceptable range, it will protect the inverter from being damaged.
If you want to know more information of more about the project reference of GN Solids Control, please you contact GN team.