GN Separation – Centrifuges with Truly Wide-Ranging Applications

At GN Separation, we take pride in delivering high-performance centrifuges to over 90 countries worldwide. What sets our equipment apart is not just its efficiency and reliability, but its remarkable versatility. From heavy industry to fine chemical processing, GN centrifuges are applied across a vast array of sectors, proving that one solution can meet many challenges.

Fig. 1 Decanter Centrifuge

Oil & Gas – Solids Control and Waste Management
In the oil and gas industry, GN centrifuges play a critical role in drilling mud solids control, oil sludge separation, and cuttings treatment. Our machines efficiently remove fine solids, stabilize drilling fluids, and reduce environmental impact—supporting both onshore and offshore operations.

Environmental Protection and Wastewater Treatment
GN centrifuges are widely used for municipal and industrial wastewater treatment, sludge dewatering, and oil-water-solid separation. They help reduce disposal costs, improve environmental compliance, and enable resource recovery, making them indispensable tools for sustainable operations.

Mining and Construction
From tailings dewatering and sand washing to tunneling slurry separation and construction site mud recycling, GN centrifuges deliver reliable performance in even the most demanding environments. Wear-resistant materials and robust designs ensure high efficiency under challenging conditions.

Chemical, Pharmaceutical, and Food & Beverage Industries
GN centrifuges adapt seamlessly to high-viscosity chemical slurries, pharmaceutical production, fruit juice clarification, plant oil purification, and biofuel processing. Different models accommodate diverse materials, demonstrating the flexibility that sets GN apart.

Specialized Applications Across Industries
Beyond these core sectors, GN equipment is applied in marine wastewater treatment, industrial waste recovery, and recycling operations, highlighting the broad applicability of our technology.

With a global reach, innovative design, and unmatched reliability, GN centrifuges are more than just equipment—they are versatile solutions capable of meeting the separation needs of virtually any industry. No matter the challenge, GN Separation brings efficiency, sustainability, and adaptability to every application.

Bearing Replacement Method for Decanter Centrifuge

During operation, a Decanter centrifuge runs at high rotational speeds, which places stringent demands on its bearings. Proper bearing maintenance and replacement are crucial to ensure smooth operation, prevent damage, and extend service life of the Decanter centrifuge.
When the drum bearings show signs of wear or malfunction and require replacement, it is essential to follow the correct procedure. The following steps outline the recommended bearing replacement method to ensure safe and reliable operation.

1. Preparation and Safety

Before starting, ensure the following:

Only qualified personnel should perform disassembly and assembly.

Use professional tools designed for bearing and centrifuge maintenance.

Disconnect the centrifuge from power and follow all lockout/tagout procedures.

Clean the working area and prepare lifting devices for the Decanter centrifuge if needed.

2. Disassembling the Small-End Bearing

Remove the Pressure Plate Bolts
Begin by loosening and removing the bolts from the pressure plate located on the main pulley end.

Extract the Pressure Plate
Use jack screws to evenly push out the end pressure plate. Ensure that all screws are loaded evenly to avoid skewing or deformation.

Remove the Pulley
Using a three-jaw puller, grip the pulley and pull it out carefully.

Mark Components for Reassembly
Clearly mark the relative positions of all components (keys, sleeves, seals, etc.) to ensure correct reinstallation later.

Remove Associated Components
Sequentially disassemble the flat key, taper-end screw, bearing seat sealing ring, and O-ring.

Extract the Bearing Assembly
Place a supporting pad on the bearing end face of the bowl shaft. Then, using a puller tripod, simultaneously remove the bearing sleeve, bearing sleeve gland, bearing, and shaft sleeve as a single unit.

3. Disassembling the Big-End Bearing

The process for the big-end bearing is similar but involves additional components:

Remove the Flange Bolts
Loosen and remove the flange bolts, then take out the differential and spline shaft.

Disassemble the Shaft End Pressure Plate
Remove the bolts from the shaft end pressure plate and use jack screws to push it out evenly. Keep the applied force balanced to avoid tilting.

Remove the Bearing Assembly
Place a pad on the shaft end face, then use a three-jaw puller to remove the connecting flange, bearing seat sealing ring, and flat key.

Extract Bearing Components
As with the small end, use a tripod puller to remove the bearing sleeve, bearing sleeve gland, bearing, and shaft sleeve together.
Make clear alignment marks on the bearing sleeve for accurate reassembly.

4. Key Notes for Reassembly

Ensure all parts are thoroughly cleaned and inspected for wear or damage before reinstallation.

Apply appropriate grease or lubricant to the bearings and seals according to manufacturer specifications.

Install the components in the reverse order of disassembly, aligning all marks made earlier.

After assembly, perform a manual rotation check to confirm smooth movement before restarting the centrifuge.

5. Summary

Although the replacement procedures for the small and big end bearings are similar, careful attention to detail is essential throughout the process. Accurate marking, even force application, and the use of correct tools will ensure safe bearing replacement and help maintain the reliability and longevity of the Decanter centrifuge.

The Role of Decanter Centrifuges in Mining Tailings Dewatering

Mining operations produce enormous volumes of tailings — a slurry composed of fine solids, water, and residual minerals — that must be properly treated before reuse or disposal. Traditional tailings ponds and dams are facing increasing challenges, from limited space to stricter environmental regulations. In this context, decanter centrifuges are transforming tailings management by enabling rapid, efficient solid-liquid separation with minimal environmental impact.

GNLW764: Engineered for Large-Scale Mining Applications

The GNLW764 Decanter Centrifuge, GN Separation’s largest and most powerful model, is specifically designed for large-scale operations such as mining tailings dewatering and TBM slurry treatment. Featuring a 30-inch (764 mm) bowl and heavy-duty construction, it delivers high throughput and reliable performance under demanding conditions. To withstand abrasive slurries, critical wear zones — including the screw conveyor blades and solids discharge ports — are protected with tungsten carbide coatings, ensuring exceptional durability, reduced maintenance, and long service life.

The centrifuge is also equipped with a Variable Frequency Drive (VFD) control cabinet, allowing precise adjustment of rotational speed to suit different materials. Real-time monitoring of vibration and temperature enhances operational safety and ensures stable, efficient performance.

Optimized Dewatering with the GNSJY6000 Flocculation Unit

For even better separation results, GN recommends integrating the GNLW764 with its GNSJY6000 Flocculation Dosing Unit. This automated system accurately injects flocculants into the slurry, causing fine particles to bind into larger clusters that separate more easily. The combined setup boosts solids recovery, increases water clarity, and reduces overall processing costs.

In summary, the GNLW764 Decanter Centrifuge represents a powerful, sustainable solution for modern mining operations. By combining advanced materials, intelligent control, and complementary flocculation technology, it helps operators achieve efficient, eco-friendly, and cost-effective tailings management.

With the GNLW764 Decanter Centrifuges now ready for dispatch, GN Separation is poised to strengthen its position as a professional solution provider in industrial separation technologies, delivering value to clients and contributing to a more sustainable future for the mining industry.

GN Separation at ADIPEC 2025 – Countdown to the Global Oil & Gas Event

The countdown is on! GN Separation is excited to announce our participation in ADIPEC 2025, the world’s leading oil and gas exhibition, taking place from 3–6 November 2025 at ADNEC, Abu Dhabi, UAE.
📍 Visit us at Hall 10, Stand No. 10453.

As one of the core divisions of GN Group, GN Separation focuses on providing advanced solid-liquid separation technologies and complete solutions for oil sludge treatment, oily wastewater recovery, and industrial separation. Over the past decade, GN has established itself as a trusted global supplier with proven performance in the oilfield, environmental protection, and mining industries.

At ADIPEC 2025, GN Separation will showcase its most representative equipment for oil, water, and solids separation, including decanter centrifuges, three-phase disc separators, and integrated oil sludge treatment systems. These systems are designed to efficiently separate oil-bearing sludge from refineries, tank bottoms, and drilling sites, allowing for maximum oil recovery and water reuse while minimizing waste disposal costs.

With growing emphasis on sustainability and cleaner production, GN Separation continues to develop intelligent and energy-efficient separation solutions. Our systems have been successfully deployed in projects across the Middle East, South America, and Southeast Asia, helping customers meet strict environmental standards and improve operational efficiency.

During the exhibition, our technical experts will be available at the booth to introduce GN’s full range of separation technologies, discuss customized solutions, and share real-world application cases.

We warmly invite all partners, customers, and industry professionals to visit GN Separation at Hall 10, Stand No. 10453, and explore how our separation technologies can make your operation cleaner, safer, and more efficient.

👉 See you in Abu Dhabi this November!

Key Precautions When Operating a Centrifuge

Centrifuges play a vital role in industries such as chemical processing, pharmaceuticals, food, and mining by separating solids and liquids efficiently. However, improper use can lead to equipment damage, poor separation performance, or even safety hazards. Below are several essential points to consider when operating a centrifuge.

T1-Dewatering Centrifuge

1. Balance and Loading Are Critical

One of the most common causes of vibration and mechanical failure in a centrifuge is unbalanced loading. Before starting the machine, ensure that all containers, tubes, or feed compartments are loaded symmetrically and evenly. In batch-type centrifuges, equal mass on opposite sides of the rotor prevents excessive stress on the bearings and drive system. For continuous decanter or disc centrifuges, steady feed flow is key—sudden surges can upset the balance and cause wear. Always check that covers are properly closed and that no foreign objects are inside the bowl before operation.

2. Monitor Operating Parameters and Maintenance

Centrifuges operate under high rotational speeds and generate significant centrifugal forces. Operators should regularly monitor parameters such as rotational speed (RPM), feed rate, vibration level, and bearing temperature. Exceeding the recommended speed or operating with a worn bearing may lead to mechanical failure.
Routine maintenance is equally important—inspect seals, belts, and lubrication systems frequently. Scheduled replacement of consumable parts such as gaskets and bearings helps maintain separation efficiency and prolong service life. Following the manufacturer’s maintenance intervals ensures stable operation and prevents costly downtime.

3. Prioritize Safety and Training

Because centrifuges involve high-speed rotation, safety precautions are non-negotiable. Operators should be trained on emergency shutdown procedures and aware of the specific materials being processed—some slurries or chemicals may create explosive or corrosive conditions. Always keep safety guards in place, avoid opening covers while the bowl is still spinning, and wear appropriate personal protective equipment (PPE). In addition, it’s good practice to record operating data and perform vibration analysis periodically to detect early signs of imbalance or mechanical fatigue.

Conclusion

Proper operation and maintenance of a centrifuge not only enhance performance but also ensure safety and reliability. By balancing loads carefully, monitoring key parameters, and maintaining strict safety discipline, operators can maximize uptime, extend equipment lifespan, and achieve consistent separation results in any industrial process.

GN Decanter Centrifuges: Efficient Solutions for Drilling Waste Management and Oil Mud Recovery

Oil-based mud (OBM) and water-based mud (WBM) are essential in modern drilling operations, providing wellbore stability, cooling, and lubrication for drill bits. However, the handling of drilling cuttings and oil-contaminated sludge poses significant environmental and operational challenges. Improper disposal can lead to soil and water contamination, regulatory non-compliance, and increased waste management costs.

In this context, GN Decanter Centrifuges, along with our oil mud recovery systems, have become indispensable equipment for the drilling and oilfield services industry. These machines utilize high-speed rotational separation to efficiently divide solids, liquids, and oil components based on density differences. As drilling fluids circulate, cuttings and fine solids are continuously separated from the base mud, allowing for both waste minimization and mud recycling.

Fig. 1 Drilling mud treatment system

The working principle of GN decanter centrifuges is straightforward yet highly effective: the slurry enters a rotating bowl, where centrifugal force drives solids toward the bowl wall. A conveyor screw, rotating at a slightly different speed, continuously transports the solids to the discharge port, while the clarified liquid flows out separately. Integrated into GN’s oil mud recovery systems, these centrifuges enable the recovery of valuable drilling oil from cuttings, reducing environmental impact and reclaiming reusable oil for mud preparation.

For water-based mud, GN decanter centrifuges efficiently remove fine solids to maintain mud viscosity, improve drilling efficiency, and protect downstream equipment. By combining high-precision decanter centrifuges with our automated recovery system, operators can achieve stable mud properties, minimal waste, and regulatory compliance.

With increasing environmental regulations and the industry’s focus on sustainability, GN decanter centrifuges and oil mud recovery solutions are no longer optional—they are a core component of responsible drilling operations. Modern systems offer adjustable bowl speeds, differential control, and durable stainless-steel construction, ensuring long-term reliability, high separation efficiency, and reduced maintenance requirements.

In summary, GN decanter centrifuges and oil mud recovery systems play a critical role in drilling waste management, helping operators reduce environmental impact, recover valuable oil, and maximize the reuse of drilling fluids, making them essential for both efficient production and sustainable operations.

Principle and Function of Three-Phase Decanter Centrifuge

A horizontal spiral sedimentation centrifuge, commonly known as a decanter centrifuge, is an efficient piece of centrifugal separation equipment designed for continuous solid-liquid or liquid-liquid-solid separation. Based on structure and function, decanter centrifuges can be divided into horizontal spiral filter centrifuges and horizontal spiral sedimentation centrifuges. Continue reading →

The Importance of Dynamic Balancing in Decanter Centrifuge Manufacturing

Dynamic balancing is a crucial step in the manufacturing of a decanter centrifuge, directly determining its stability, performance, and lifespan. Because a centrifuge operates at extremely high rotational speeds, even a tiny imbalance in the rotating assembly can lead to serious vibration, noise, premature bearing wear, or even structural damage.

At GN Separation, every decanter centrifuge goes through a three-stage dynamic balancing process to ensure excellent performance and long-term reliability.

  1. First Stage – Medium-Speed Balancing (around 1800 RPM):
    In this stage, both the bowl and scroll assemblies are tested at medium speed to eliminate initial imbalance and ensure that the components are stable before high-speed rotation. This helps technicians identify any unbalance caused by machining or assembly tolerances early on.
  2. Second Stage – High-Speed Balancing (Operating Speed):
    The next step involves balancing the rotating assembly at the centrifuge’s actual working speed, which can exceed 3,000 RPM depending on the model. This high-speed test simulates real working conditions and detects even the smallest residual imbalance that only appears at high rotational speeds.
  3. Third Stage – Complete Machine Balancing:
    Finally, after the whole centrifuge is fully assembled, the entire unit undergoes integrated dynamic balancing in GN’s dedicated balancing workshop. This final step ensures the centrifuge runs smoothly and stably under full-speed operation, minimizing vibration and extending the life of bearings and seals.

Figure 1. Dynamic Balancing

Many manufacturers only perform low-speed or single-stage balancing, but GN’s three-stage balancing process provides a much higher level of accuracy and safety. During each stage, vibration amplitude and phase angle are carefully measured, and corrections are made until the unit meets strict balance standards.

Through this comprehensive process, GN ensures that every centrifuge operates with minimal vibration, lower noise, and maximum reliability. Dynamic balancing is not just a quality checkpoint — it’s a core guarantee of precision engineering and long-lasting performance.

Efficient Mud Management: Advanced Dewatering System for U.S. Construction Projects

1. Background: The Challenge of Construction Mud Disposal

In large-scale construction projects, especially in urban areas of the United States, managing slurry and drilling mud is a major environmental and operational challenge. Construction mud typically contains fine solids, sand, silt, and chemical additives that make it difficult to dispose of directly. Traditional settling tanks are inefficient and require large space, while uncontrolled discharge can lead to pollution and penalties. To achieve cleaner operations and meet strict environmental standards, advanced solid-liquid separation technology has become an essential part of construction site management.

2. The Dewatering Solution: Vibrating Screen and Decanter Centrifuge Combination

The combination of a dewatering vibrating screen and a big bowl decanter centrifuge provides an efficient and compact solution for mud treatment. The vibrating screen performs the first-stage separation by removing coarse particles and sand from the slurry. This reduces the solids loading on subsequent equipment. The partially clarified liquid then enters the decanter centrifuge, which uses high rotational speed and strong centrifugal force to separate fine solids and recover clean water.

The big bowl decanter centrifuge, featuring a large diameter and optimized bowl length ratio, delivers higher capacity and drier solids discharge. It ensures continuous operation with automatic control and minimal operator intervention. Together, this system significantly reduces waste volume, lowers disposal costs, and allows water to be recycled for reuse in drilling or construction processes.

3. Environmental and Economic Benefits

By adopting this dual-stage dewatering system, construction contractors can achieve sustainable operations while improving profitability. The recovered water can be reused onsite, reducing fresh water consumption by up to 80%. The dry solids can be easily transported for landfill or further treatment, minimizing handling costs.

Moreover, the entire process is enclosed and automated, ensuring clean, safe, and compliant site management. With increasing emphasis on green construction and circular resource use, integrating vibrating screens and big bowl decanter centrifuges has become a preferred choice for many U.S. engineering and infrastructure projects.