TBM centrifuge | GN Decanter Centrifuge

How and Why to Choose a Suitable Drilling Cuttings Waste Management System for OBM

By using an efficient solution of the drilling cuttings waste management system and treat the solids well, the particles could be dryer and even reach the standards to be discharged, meanwhile, the expensive drilling fluids could be collected and put back to the drilling system.

GN DRILLING CUTTINGS WASTE MANAGEMENT EQUIPMENT

Ever since year 2013 when GN Solids Control firstly designed and put into reality the GNCD930 series cuttings dryer, GN has designed 2 kinds of drilling cuttings treating system, both combined by following equipment:
1. GNCD930 vertical cuttings dryer. It is like a drying step of a washing machine, by high speed vertical drying, the liquid phase, drilling fluid passes the mesh of the cone sized basket, while the solids phase, the cuttings, fall down to the discharge port. After treatment of GNCD930, the OCC could be less than 5%. And according to different cuttings condition, GN gives 3 optional mesh opening sizes. Clients could prepare all of the three for different conditions.
GNCD930 Vertical cuttings dryers are firstly designed for the OBM and SBM, but per some clients’ feedback, it could be useful for some water based mud, too.

2. After the GNCD930 vertical cuttings dryer, the drilling cuttings are collected while the drilling fluid falls into a container and to be pumped to next step, the GNLW363 series decanter centrifuges. GNLW363 series decanter centrifuges are the super star among GN centrifuge models. In every 10 sets of GN Centrifuges, 7 are GNLW363 decanter centrifuges. It has the medium size and more optional control panels for option. In solids control system, clients always choose fixed speed GNLW363, while in drilling cuttings waste management or drilling fluid treatment project, the VFD model with PLC control panels are more popular. In some none explosive conditions, clients could choose the more economic model, while in some countries and regions when IECEX or ATEX is a must, GN also have those models for option.

3. GNSC series screw conveyors. By providing screw conveyors of different diameters and length, GN has 12 models for option. Clients could choose per the transporting capacity and distance to be transported.

Small Mud Recycling System for Diamond Core Drilling

Diamond core drilling is one kind of drilling project which is similar with some small HDD or TBM drilling. But comparing with HDD or TBM drilling, although the requested capacity of the diamond core drilling is smaller, the separation standard is even higher.

core drilling mud system — GN compact solids removal unit

GN Solids Control has some mature solutions for such kind of drillings, and GN Solids Control has a group of compact designed separating equipment to serve in this system. This system is combined by a small shale shaker and a baby centrifuge, which are the most efficient separation equipments, and the cutting point could reach 2 to 5 microns. Besides the separation equipment, this system has a mixing unit also, which is used for adding more components into the system.
In this system, following equipment are included:

1. GNZS752E-DM shale shaker. This is a small shale shaker, suitable for the small capacity applications like the diamond core drilling. It has 2 pieces of shaker screens, with a screen area of only 1.35 cbm, only larger than half of GN normal shakers. But this capacity and mud routine is enough for the small projects. GN has a shaker screen factory for making composite material frame screens for this shaker model.

2. GNLW223-VFD decanter centrifuge. It is the smallest decanter centrifuge among GN centrifuge models. The bowl diameter of GNLW223 is only 9 inch, but the rotating speed could reach 4200RMP as normal operating speed.

3. Jet mixing hoppers for the mixing unit.

4. A tank for housing those above mentioned equipment and for receiving the liquid discharged from the equipment.

5. Centrifugal pumps respectively for feeding the decanter centrifuge and the mixing unit. GN centrifugal pumps are fully interchangeable with NOV Mission pump in both installation dimensions and spare parts.
Besides being used to the diamond core drilling projects, it is also used for some small HDD projects. For more information, pls contact GN Sales team.

GN Big Bowl Centrifuge for Waste Water Treatment Projects

Comparing with the most commonly used 14 inch decanter centrifuges, the GNLW452 and GNLW453 Decanter Centrifuges of 18 inch bowl and GNLW553 decanter centrifuge of 22 inch bowl are already called big bowl centrifuges. In this case, the newly on show GNLW764A-VFD Decanter Centrifuge could be a giant centrifuge, because the bowl diameter is 30 inch while the length-diameter ratio is 4.4 to one.

This design is suitable for handling the large capacity with a single unit of centrifuge. And the special design and best material chosen makes the GNLW764 decanter centrifuge to have a good performance and longer service life.
Besides GNLW764A-VFD decanter centrifuge, GN also has designed GNLW554D-VFD decanter centrifuge, which is also of large length diameter ratio up to 4, it is quite suitable for the waste water treatment projects.
Just like all of GN high standard decanter centrifuges, GNLW764 and GNLW554 decanter centrifuge share all following features:

1. Electric components are of Siemens, ABB or Schneider, all of world best brands.
2. For the VFD control panels, GN provide positive pressurized control panel and has air conditioning system for cooling as option.
3. Bowl main body material is made of duplex stainless steel SS2205.
4. Impeller protection is with tungsten carbide tiles, for longer service life and easier keeping the dynamic balancing.
5. Solids discharge port is made of special ceramic or tungsten carbide inserts, to have a longer service life.
6. Flexible adjustable liquid level ponds, to change the drying level of treated material.

Also, for the CIPPE 2017 which was held in Beijing, GN Solids Control also showed the fully hydraulic decanter centrifuge, of 14 inch bowl diameter. It is preferred by some clients from extremely high temperature condition and where the electric power is limited.

GN decanter centrifuges are widely used for drilling rig solids control system, the drilling waste management system, for the dewatering system, for TBM project separation works, and also for the oily sludge separation projects and soil remediation projects.
If you have any question or need more information, please fell free to contact GN sales team directly or visit GN factory near Beijing, Capital of China.