GN Separation is the branch company of GN Solids Control. Recently, GN Separation is complete and production and commissioning of a 3 phase decanter centrifuge for overseas fish oil processing plant. All the material standard and production process are specially done to suit for the food industry centrifuge applications.

The decanter centrifuge model for fish oil separation plant is GNLWS364-VFD. The model is designed for 3-phase separation. The bowl of the decanter centrifuge is 14 inch. And the length and diameter ratio of the decanter centrifuge is up to 4. VFD control panel is equipped for the high speed decanter centrifuge. The operators can adjust bowl speed and conveyor speed based on the material situation and their separation demands. The enclosure of the VFD control panel is container steel for more durable. And hte VFD control panel includes 3 VFD control for the main drive motor, for back drive motor, as well as the VFD control on the feeding pumps.

The manufacturing time of decanter centrifuge is much longer than other separation equipment, like shale shaker, degasser, mud cleaner, etc… As the components of centrifuges are much more complex, and it takes more testing during production and before delivery.

Every decanter centrifuge made by GN Solids Control / GN Separation will be fully inspected and test before delivery from GN factory. Below is the general testing process in GN factory for every centrifuge before delivery.
1. After assembly, the decanter centrifuge must be running at the rated speed without load for at least 4 hours.
2. The decanter centrifuge will further be test with water at rated speed for at least 30 minutes, and the total water test should no less than 2 hours at the factory.

Besides the 14 inch 3 phase separation decanter centrifuge, GN Solids Control makes other small size and bigger size decanter centrifuge and disc centrifuges for various applications. And plus, GN Solids Control makes oil field shale shaker separator and mining industry screen separators.

GN Solids Control finished a complete a solids control mud system for a drilling company in India. It is a 3-tank mud system plus a separate trip tank and separate pill tank.

The trip tank is equipped with mud agitator and a small size centrifugal trip pump. And plus, there is a radar level gauge equipped on the trip tank for the auto start / stop of the trip pump.

There are 2 active tanks and 1 water tank, each tank with usable capacity 250bbl. The #1 active tank is shaker tank, which is holding 2 sets of solids control shale shaker, a 1200GPM vacuum degasser, a desander, and a desilter mud cleaner. As the mud system is designed for offshore rigs, the double deck shale shaker GNZS706 is applied in the system. It is a 6-panel double deck shale shaker with linear motion.

After shale shaker and before desander, desilter separator, there is a 1200GPM vacuum degasser applied in the system. All the mentioned separation equipment are allocated on the shale shaker tank. And there are electrical control panels on the tank top to control all the equipment in the system. 37KW (50hp) centrifugal pumps are used as feeding pump of desander and desilter.

The #2 active tank is mixing tank. And plus, there is a 14 inch high speed centrifuge applied in the system. It is a fixed speed decanter centrifuge with high speed for low gravity separation. Vertical slurry pumps are used in the system to feed for the decanter centrifuge. The model of the feed pump is GN50YZ40-10B with 5.5kw explosion proof motor. There are 2 feeding pumps in the system, one for feeding, another one is for back up. A vortex and venturi mixing hopper unit is used in the system for mud mixing. A 37KW (50hp) centrifugal pump is used as mixing pump for the hoppers.

The # 3 mud tank is a 250bbl water tank. There is no separation or mixing equipment used in the water tank. There are pipelines connecting the water tank to all the rest active tank and mixing tank compartment.

Decanter centrifuge and disc centrifuge are both widely used in oily sludge separation system. Compared with filter press, centrifuge separation has the advantages of supporting continue separation, and less human being involved in.

Before centrifuge separation, double deck shale shaker is used to remove the big particles and sand, and to reduce the mud weight. The advantage of using a double deck shale shaker in the oil sludge treatment system is that it does not block the screen in the presence of fibrous or coarse particle materials. Customers choose the screen opening or API size of the upper coarse screen and lower fine screen based on the distribution of the incoming materials.

Hydro cyclone is not used in oil sludge treatment systems because the viscosity of the oil sludge material is usually high, and the cyclone separator can easily block. The bottom fine mesh screens of the double-layer shale shaker can replace the separation effect of the cyclone. Compared to cyclone separation, the separation efficiency of shaker screen particles is 100%, and particles larger than the screen aperture will be 100% separated.

Below is a general introduction of decanter centrifuge and disc centrifuge.

Decanter centrifuge is horizontal type centrifugal separator. There are 2 phase decanter centrifuge and 3 phase decanter centrifuge. 2 phase decanter centrifuge is for liquid and solids separation. It can allow solids content till 15% ~ 20%. But the less solids content, the better separation result.

3 phase decanter centrifuge is for oil, water and soil separation. Operators can change the degree of the liquid discharge dam to adjust the clearness of oil and water. The recovered water and oil can be reused in the system. But it is for a general separation, the water is not clean, and the oil is not pure still with soil and water. And the soil cake is not dry.

Disc centrifuge is a kind of vertical centrifuge. It is for 3 phase separation. Disc centrifuge can get relative clean water, and oil, and get dryer soil cakes. But disc centrifuge is easy to be blocked, it must be check and viewed timely. It means it can only allow small soil content before enter into the disc centrifuge. Hence the disc centrifuge is normally used after 2 phase decanter centrifuge or 3 phase decanter centrifuge.

CIPPE in Beijing is the largest exhibition related to oil and gas industry and petroleum field. 2023 Beijing CIPPE was hold from 31 May to 2nd June 6. Although the weather is hot, large number of visitors and exhibitors were coming from long away. GN Solids Control got back from the big event Beijing CIPPE oil show. Old clients and new clients were meet on GN booth, and arrange factory visiting outside the exhibition.

In order to help clients have a better understanding on the development and improvement of GN Solids Control, and do not need to go here and there, GN took its major separation equipment and transfer equipment on the booth.

Item #1 on display: Transfer equipment Solids and sludge vacuum pump.

Item #2 on display: Transfer equipment Screw conveyor

Item #3 on display: Separation equipment big bowl decanter centrifuge 22 inch
GN Solids Control makes various models 22 inch decanter centrifuge to suit for various material separation. The design and size of the bowl will be modified based on the project situation. Some times, the material standard should also be suit for the material demands. In this case, it is necessary for GN sales engineers to communicate and know more about clients separation demands.

Item #4 on display: Separation equipment high speed decanter centrifuge 14 inch
GN Solids Control makes various models 14 inch high speed decanter centrifuge to suit for various material separation. The design and size of the bowl will be modified based on the project situation.

Item #5 on display: Separation equipment disc centrifuge. The disc centrifuge is for 3 phase separation. As the disc centrifuge can only allow small percentage soil content, it is easy to be blocked, it is normally used after 2-phase decanter centrifuge.

Item #6 on display: Separation equipment vertical cuttings dryer.
Drilling waste vertical cuttings dryer is specially designed and made for oil base mud and oil base cuttings. It can reduce the oil on cuttings to less 5%.

Item #7 on display: Separation equipment high G drying shaker.
High G drying shaker is for drilling waste management, it is used after solids control system. It is mainly used for water base mud and water base cuttings.