Desander Desilter

A high speed decanter centrifuge or a VFD decanter centrifuge can be widely used for drilling fluids cleaning, drilling cuttings treatment, waste water treatment and slurry dewatering, etc. How to operate a high speed decanter centrifuge produced by GN Solids Control? Below is some instructions about it.

Firstly connect with power supply with decanter centrifuge control panel, switch controller between control panel and power supply is necessary to ensure wiring safety, then loose the fixing screws, keep the screw end 5mm faraway from centrifuge bowl. If the centrifuge is VFD decanter centrifuge, plug the main motor, variable frequency back drive motor, back drive motor fan, and feeding pump motor into the control panel, connect the power cable to the terminals in the VFD control panel, then provide clean and dry air from the air inlet, the required working pressure is 0.4 Mpa to 0.7 Mpa (150~200 L/min).

During operation of the VFD decanter centrifuge, open the air source and adjust the inlet pressure, select work mode. Simultaneously push the 2 buttons on positive pressure controller for 5s until displayed N , the positive pressuried VFD control panel start to work. Input the main motor speed and back drive motor speed to start the centrifuge, when the centrifuge operates normally , input the operation parameters of the feeding screw pump. when the feeding pump is stopped, a red window showed that “conveyor speed set error, number set should lower than”, pls select No to refuse flushing. When the red window disappeared, set flushing parameters to flush the decanter centrifuge. After the decanter centrifuge stopped completely, switch off main power, close air source, cut off power supply.
If you have any problem to operate GN high speed decanter centrifuge or VFD decanter centrifuge produced by GN, pls contact with GN solids control.

Even though all of the screw pump, submersible slurry pump, centrifugal pump, diaphragm pump, inline pump can be used as decanter centrifuge feeding pump, but the most universal feeding pump for decanter centrifuge is mono pump or positive displacement pump. As one of the decanter centrifuge manufacturer in China, GN solids control normally used single screw pump as feeding pump, including VFD screw pump, manual variable speed screw pump and fixed speed screw pump, which depends on client’s different requirement. The most common brand screw pump we applied is Netzsch brand with reliable working and worldwide after sales service, the client can choose to get local service from Netzsch or get service from GN Solids.
When the client’s decanter centrifuge is with variable frequency drive control panel and buy feeding pump from GN, we will make the screw pump motor frequency converter into the Centrifuge VFD control panel, which can be adjusted from the PLC smart control touch screen easily according to client’s requirement, it is recommend to use variable speed motor for the screw pump for better performance.
If the client’s decanter centrifuge is a fixed speed decanter centrifuge, for example, 2700rpm, but they need to adjust the feeding rate by adjust the screw pump motor speed, manual variable speed screw pump can be selected, which with a mechanical adjustable speed gearbox. The working principal of the positive displacement pump decide that the feeding flow rate can be adjusted effectively by adjust the speed, if for other type feeding pump, such as centrifugal pump and submersible slurry pump, it is hardly to adjust the feeding rate by variable frequency, it is suggested to adjust the flow rate manually by control valves.
Not only as decanter centrifuge feeding pump, the screw pump can be also as flushing pump of vertical cuttings dryer.

GN designed horizontal type vacuum degasser create a negative pressure inside the vacuum tank by the vacuum pump suction. Under the atmospheric pressure, the drilling fluids enter the hollw shaft of the rotor through the suction pipe, then sprays towards the tank wall through the windows around the hollow shaft. Due to the collision and separation wheel, the drilling fluids forms a thin layer, causing bubbles immersed in the mud to break and gas escape.Through the vacuum pump suction and gas water separator’s separation, gas is discharged to a safe area through the exhaust pipe, mud is discharged from the mud outlet through centrifugal force generated by the impeller rotation driven by the main motor. Remember that the main motor should be started firstly, then vacuum pump motor starts. The suction pipe and discharge pipe should be placed under the mud level.

The vacuum pump is a water ring type vacuum pump, when start the vacuum pump motor, a negative pressure of 550mm Hg is formed by the vacuum pump inside the vacuum tank.
The outlet pipe is connected to the intet of gas water separator, the gas is out of the vacuum tank and discharged through the exhaust pipe.
How to use the horizontal vacuum degasser?

Firstly, open the ball valve on the vacuum pump water inlet pipe, then open the valve on the water inlet of the gas water separator, press start on the control panel, start the vacuum pump, let the drilling fluids enter into the vacuum tank. The vacuum pump will be stopped if you press the stop button, then stop the main motor button , disconnected the power supply.
Except for horizontal type vacuum degasser, we also produce centrifugal degasser for vertical installation, If you need a centrifugal degasser, pls check with GN solids sales.

As one of the mud agitator manufacturer in China, GN solids control can produce both direct connection and coupler connection mud agitator according to client’s requirement. The mud agitator model will be selected according to tank design and tank dimensions. The most popular mud agitator is horizontal type with helical bevel gearbox, the motor and gearbox is direct connection.

To select the mud agitator horsepower and impeller size, we will collect information as below: tank shape is rectangle tank or vertical cylinder tank, the tank dimension, maximum mud weight and desired turnover ratio. The TOR value should not less than 40 second and should not greater than 85 seconds. According to the client’s requirement, we can supply different explosion proof standard, such as CNEX, IEC EX, ATEX or UL.

When install the mud agitator on the mud tank, the agitator should be lifted horizontally, and place it on the right position, put the agitator shaft on a strict vertical line, then weld 4ea pad on the tank and tighten the base fixing bolts. Welding the stabilizer on tank bottom, and put the shaft with impeller into stabilizer. Adjust the position of the stabilizer to make the shaft vertical, and ensure the normal rotation of the shaft, ensure the stabilizer will not affect the rotation of the shaft.
The mud agitator main components including gearbox, motor, gearbox mounting plate, shaft, shaft stabilizer, impeller, if it is coupler connection mud agitator, also with coupler. The electric control panel will be installed besides the mud agitator.
Except for mud agitator, GN solids control also produce mud gun, mixing hopper, centrifugal pump, shale shaker, mud cleaner, desander, desilter, vacuum degasser, decanter centrifuge, screw pump, submersible slurry pump, mud tank, mud gas separator, vertical cuttings dryer, screw conveyor, electric control panel, high G drying shaker, etc.

As sludge vacuum pump manufacturer in China, GN solids control produce 100% air operated vacuum pump with different treating capacity, including GNSP-10B, GNSP-20B, GNSP-40B.
How to operate the sludge vacuum pump with 40m3/h flow?

Firstly connect the air supply, normally air compressor which meets the pressure requirement, and manual mode or automatic mode can be selected as client’s requirement.
When automatic mode is selected, set the “automatic and manual switching valve” to the “zero position”, turn on the air supply, set the switching valve to the “manual state”, and set the “loading and unloading switching valve” to the “unloading state” to confirm the emptying of the material in the tank; Time 2 minutes;

Restore the “automatic and manual switching valve” to “zero position “, switch the “automatic and manual switching valve” to the “automatic state”, and the equipment can operate in automatic mode. The equipment will automatically suction and unloading according to the set loading and unloading time; (according to our experience, setting values for loading and unloading are 10s, which can be adjusted by users according to on-site conditions);
If manual mode is selected, set the “automatic and manual switching valve” to “manual state” and the “loading and unloading switching valve” to “unloading”;
Restore the “loading and unloading switching valve” to “zero position”; Place the suction port into the material to be sucked in
Turn the “Load and Unload Switching Valve” to “Load”, and the pump starts to suck materials when the tank is full; Turn the “Load and Unload Switching Valve” to “Unload”, and the pump starts to discharge slurry.
The automatic mode and manual mode can be only selected for GNSP-40B vacuum pump, the smaller size vacuum pump with only automatic mode. The vacuum pump can be used to transfer drilling waste from solids control equipments, drilling fluids, animal waste, sand, powder material, oil sludge, etc. material.

GN solid control showed our decanter centrifuge at 2023 NEFTEGAZ Russia Oil Exhibition. Neftegaz and National Oil and Gas Forum the major event of the fuel and energy sector. Neftegaz is Russia’s largest trade show for the oil and gas industry. It ranks in the top ten of the world’s petroleum shows. Supported by the Russian Ministry of Energy, Russian Ministry of Industry and Trade, Russian Union of Industrialists and Entrepreneurs, Russian Gas Society, Union of Oil and Gas Producers of Russia. Every year GN solids control will participate in NEFTEGAZ exhibition, to show our lastest technology. This year total 573 companies participate in the exhibition, total visitors over 22820, and total hall area over 35000 square meters.
The exhibition information is as below:
Exhibition name: 2023 NEFTEGAZ Russia Oil Exhibition
Exhibition time: April 23th to 27th, 2023
Exhibition location: Expocentre Fairgrounds, Moscow, Russia
This year we showed GN decanter centrifuge, vertical cuttings dryer and shale shaker screens.

GN 14inch bowl decanter centrifuge is one of the most popular model decanter centrifuges for oil and gas drilling fluids treatment and drilling waste treatment system, it can be also used as dewatering centrifuge with chemical dosing unit. We can produce high speed decanter centrifuge, VFD decanter centrifuge and Fully Hydraulic Drive decanter centrifuge for different application, also we can provide different explosion proof standard for your requirement, CNEX, ATEX or IEC EX.

The vertical cuttings dryer is widely used to treat OBM, SOBM drilling waste, it can reduce the oil from the cuttings effectively. Even under minus 40C degree in the winter, GN vertical cuttings dryer is also able to work well inside special decorated container to keep it warm.
If you need a containerized drilling waste management system solution to our client, if you need more information, pls contact GN Solids control.

This week GN separation participate in 2023 IE expo Shanghai China environmental show.
The exhibition time: April 19th to 21th
GN stand No.: N4-H46 (Hall 4)
For more information of the exhibition, pls refer to the official website: https://www.ie-expo.cn/Home
What equipments GN showed at 2023 IE expo Shanghai China environmental show?

GN Industrial decanter centrifuge
GN can produce different diameter, different bowl length, different beach angle decanter centrifuge, including 9 inch bowl, 14 inch bowl, 18 inch bowl, 22 inch bowl, 30 inch bowl, for industrial waste water treatment.

GN Solilds transfer pump
The solids vacuum pump is an ideal equipment to transfer the slurry with high density, high viscosity, and suitable for long distance transfer, it is normally used to transfer the oil sludge from waste pit or suction directly from oil tank bottom to oil sludge treatment system.

GN oil sludge shaker
A coarse solids separation shaker is applied before oil sludge decanter centrifuge, the function is to remove coarse solids, reduce solids content, and ensure the feeding fluids to decanter centrifuge meet the feeding requirement, and not damage/ block the decanter centrifuge.

GN oil sludge decanter centrifuge
The oil sludge treatment decanter centrifuge is a 2 phase separation decanter centrifuge( solids and liquid separation) or 3 phase separation decanter centrifuge( oil, water and solids separation) or 3 phase disc separator ( oil, water and solids separation), GN sales engineer will select proper model centrifuge as per the treated material and treatment target. To archive better result, chemical additives is recommend to use with the oil sludge centrifuge.

If you did not have a chance to visit this show, welcome to visit our facilities in Langfang, China, which is nearby Beijing International Airport, also we will show our lastest technology equipments in our factory.

GNLW764A-VFD decanter centrifuge is a big bowl high volume decanter centrifuge produced by GN, it can be widely used for dredging slurry separation, TBM slurry separation and other type waste water treatment as dewatering centrifuge, which required a higher treating capacity in the project.

The technical specification of the big bowl dewatering centrifuge is as below:
The bowl diameter is 30 inch, the bowl length is 131 inch, and max designed speed and max G force is 2650rpm and 3000G. The designed water treating capacity is up to 1254gpm, adding with chemical additives, the dewatering capacity is up to 50m3/h.

The bowl and screw core shaft are made of duplex stainless steel SS2205 or SS2304 by centrifugal casting, the major components are made of by centrifugal casting and die forging process to avoid intergranular corrosion and incomplete residual stress release caused by traditional welding process. The solids outlet and fluids outlet port is protected by replaceable hard alloy sleeve. The liquid outlet weir height is adjustable according to different working conditions, if you need to improve the treating capacity, then the solids dryness will be reduced, and fluids clean will be reduced. If you want to keep the discharged solids dryness, water clean, just adjust the weight height plate with a balance according to your requirement. The bearing lubrication system of thin oil circulating oil station is applied for the big bowl decanter centrifuge, for heavy load and high speed operation, the good oil lubrication system with good cleaning and cooling functions could improve the service life of SKF brand bearings obviously.

The VFD control panel adopted with the dewatering centrifuge is with stainless steel material cabinet, PLC smart control and touch screen from Siemens or other famous brand, world famous brand VFD for main motor, back motor and feeding pump motor.

The tank cleaning system consists of tank cleaning machine and the tank cleaning sludge treatment system.
The tank cleaning machine is developed for cleaning tanks in hazardous areas, which provide better cleaning efficiency with minimal use of time, energy and cleaning media.
The tank cleaning machine consists of two main part, one is washing unit, the other one is portable air driven unit. The typical application of the tank cleaning machine will be for crude oil storage tanks, large process vessels and fermenters, large silos and dryers, large reactor, large uni-tanks.

The working principal is as below:
The cleaning media flows through the machine to the nozzle and out of the tank, with high pressure jetting to the tank. This jetting cleaning will create a criss crossed pattern on the tank walls, covering 360° of the tank. The first cycle will create a wide pattern, Pre Wash, on the tank walls, the following cycles will dense the pattern until a full program is reached after 4 cycles.

After cleaning, the sludge will be treated by automatic tank cleaning system, it is a continuous process with waste water cleaning capacity up to 30m3/h, the treated water can be back to high pressure tank cleaning machine for tank cleaning reuse. The process will minimize the consumption of water and manpower involved.
The tank cleaning system can be designed as a skid mounted system or divided into 3 modules according to the job site layout, the explosion proof standard could be as CNEX zone 1 application, ATEX or IEC EX for different applications. The automatic tank cleaning system including strainer, suction pump, chemical dosing unit, static mixer, electric control system, inclined plate clarifier, membrane pump, etc. If you need a tank cleaning unit for onshore or offshore project, pls contact with GN solids control.

We can use both 3 phase decanter centrifuge package and 3 phase disc separator package for oil sludge treatment, the pre-treatment equipment for both of them are shale shaker for primary screening of coarse solids. We will select proper 3 phase separation package according to client’s requirement and oil sludge conditions.

The comparison of 3 phase disc separator and 3 phase decanter centrifuge is as below:
The max G force of 3 phase disc separator is up to 12000G, but for 3 phase decanter centrifuge is up to 3000G.
The 3 phase disc separator will be used after 2 phase decanter centrifuge or 3 phase decanter centrifuge. The treatment result for oil on solids , water in oil, oil in water is in high level.

The 3 phase decanter centrifuge can be used separately after primary screening of coarse solids, if the budget is limited, and the treatment result of oil on solids, water in oil, oil in water is not high.
The operation of 3 phase disc separator is complicated and need cleaning frequently, but operation of 3 phase decanter centrifuge is more simple with automatic cleaning. So if the user need to get high quality oil and water, and no limit for the investment, 3 phase disc separator package is proper option. If the investment is low and less quality oil water is required, we will select 3 phase decanter centrifuge package.
Except for 3 phase disc separator package and 3 phase decanter centrifuge package, GN also provide accessories for them, including vacuum pump package to pick up the oil sludge, pre-mixing tank for pre-treatment including chemical jetting, heating and mixing, coarse screening module, chemical dosing unit and oil water storage tank, etc.
If you need a customized oil sludge treatment solution, pls contact with GN solids control.