Recently 3 units of trenchless GNMS-500D desander unit for HDD project in China. The desander unit can be widely used for HDD, trenchless engineering, piling slurry cleaning, Micro TBM ( Tunnel Boring Machine), diamond core drilling, water well drilling. Depends on the piling bore hole qty and depth or HDD machine required flow rate, we can help our client to select proper model mud cleaning system or provide a customized solution for their projects.


The technical configuration of GNMS-500D desander unit is as below:
The general treating capacity is 500gpm, desander separation cut point is 40 microns, the mud cleaner model is GNZY753E-Y1S with 1 ea 10 inch desander cone, with vibration strength is below 7.1G ( adjustable), the bottom screen area is 1.35m2, top screen area is 0.875m2, total screen area is 2.22m2. The hydrocyclone feeding pump is GNSB5X4C-13(12)J with 30KW motor. Total power is 32KW, the inland shipping dimension is 3103x1896x2441mm, the operation dimension is 3506x1896x3907mm, total weight is 2850kgs.


The working principal of piling desander unit is as below:
The submersible slurry pump pick up the slurry from mud pit to bottom shaker screens of the double deck shale shaker to separate coarse solids from the slurry and protect the centrifugal pump impeller, the fluids dropped into the mud tank and the desander feeding pump feed the fluids to desander cone, the fluids after treatment will flow to storage tank through pipelines, the solids are dropped on the top layer shaker screen and separated out. The user need to prepare the flexible hose to connect the submersible slurry pump with the desander unit, and mixing unit with hopper, and a big storage tank.


Except for GNMS-500D desander unit, we also have other models, as GNMS-200D desander with 200gpm treating capacity, GNMS-1000D desander unit with 1000gpm capacity.

2 units of GNLW554EP are shipped to a domestic company for waste water treatment. The project is to treat industrial waste water in an industrial area in Yunan Province.


As one of the professional decanter centrifuge manufacturer in China, GN solids control can design and produce decanter centrifuge for different applications, with different bowl size, including 9 inch bowl, 14 inch bowl, 18 inch bowl, 22 inch bowl, 30 inch bowl. Each bowl size with different bowl length, for example, for 9 inch bowl centrifuge, we have GNLW223D, GNLW224D-VFD, GNLW224D, GNLW224D-VFD for solids removal unit for mining waste water treatment and slurry cleaning. Also we have GNLW224EP series to treat industrial waste water. For 22 inch bowl decanter centrifuge, GNLW553C-VFD is for solids control and drilling waste management and dewatering unit, GNLW554EP is mainly for industrial waste water treatment. The technical specification is as below:


Bowl diameter 22 inch, bowl length 91 inch, designed capacity is 600gpm, typical capacity 480gpm, max G force is 3051G, typical G force 2412G, max bowl speed is 3150rpm, typical bowl speed is 2800rpm, the cut point is 2~5 microns, differential speed is 0 ~ 45 rpm, gearbox ratio is 35:1, main motor 120HP, back drive motor 60HP, proper chemicals should be added to separate ultra fine solids from the waste water. The bowl length/ diameter is 4.1, the material can stay in the screw for longer time to improve the separation efficiency.
The end user plan to use imported decanter centrifuge originally, after study GN decanter centrifuge features, international case study and production facility, they decided to use GN big bowl decanter centrifuge for convenient parts supply, after sales service, good performance and competitive price.
For more information, pls contact with GN sales engineer, we will make customized design decanter centrifuge solution for your requirement.

Recently one set of CBM drilling rig mud solids control system are ready for shipment for coal development company. The technical configuration is as below:


1) 2 units of GNZS703F shale shaker to separate coarse solids from the drilling mud, the composite material frame shaker screens with stainless steel material wire mesh are installed on the shale shaker, the average working life is 300 ~ 700 hours, each shale shaker are drived by 2ea Italy Oli brand vibration motor, the total screen area for one shale shaker is 2.73m2, we can provide shaker screens from API 20 to API 325 for different client’s requirement.


2) 1 unit of GNZJ752F-1S desander cleaner with bottom shaker to separate the particle solids 45 microns to 75 microns, the treating capacity is up to 500gpm, the desander cone material is 100% PU for longer working life
3) 1 unit of GNZJ752F-8N desilter cleaner with bottom shaker to separate the solids size 20 microns to 45 microns, the treating capacity is up to 500gpm, the desilter cone material is 100% polyurethane for wear resistance


4) 4 units of Mud tanks, 2 ea shale shaker and desander, desilter are installed on top of mud tank, tank accessories and electric control system are attached.
5) 1 unit of Jet mud mixer, including venturi hopper and mixing pump
6) 3 units of Centrifugal pumps, which is 100% interchangeable with world famous brand pump, the pump casing and impeller are made of hard ductile iron for better abrasion resistance.
7) 1 unit of decanter centrifuge to separate fine solids from 5 microns to 7 microns, to reduce the solids content. The submersible slurry pump will transfer the clean fluids to decanter centrifuge from desilter compartment, the clean fluids are collected in the mud tank.
8) Several units of mud agitator

Recently GN solids control shipped one batch of screw conveyor and vertical cuttings dryer for international environmental Engineering company.


The screw conveyor is used to collect the drilling waste and transfer to vertical cuttings dryer, the discharged solids are also collected and transferred automatically to cuttings box. The vertical cuttings dryer are installed inside the container, with proper open on top for convenient maintenance and operation, and also open doors in proper place, the flushing pump of vertical G dryer and decanter centrifuge feeding pump are also installed inside the container to keep them working in warm temperature. The screw pump is from Netzsch brand single screw pump with explosion proof motor. The fluids treated by vertical centrifuge flow to storage tank, the decanter centrifuge feeding pump transferred the fluids to decanter centrifuge to separate more fine solids.


The screw conveyor is U type screw conveyor with rotating screw to move the material along the fixed casing continuously. We can make feed port and discharge port at any position in the length direction as per client’s requirement. Not only for drilling waste, the screw conveyor can be also used to in different industries, as food, medicine, chemicals, paper making, environmental solutions, construction industry and other industrial applications. To select a proper model screw conveyor, we need to know the required transfer capacity and power required and transfer length. We have 10 inch, 12 inch, 14 inch, 16 inch, 18 inch screw diameter for option, and divided each section as 12ft, we have 12ft, 24ft, 36ft and 48ft for option.


For GN screw conveyor: the screw flights are made of wear resistant and thicker manganese steel, and it is aso sprayed with wear resistant coating to prolong its working life. The bearing seats are made of aluminum casting for reliable performance.

The main equipment to be used for OBM waste treatment is vertical cutting dryer and decanter centrifuge, depends on different countries environmental regulation, the oil content required for drilling cuttings disposal is different, normally below 5% is acceptable for developing countries, below 1% is acceptable for developed countries. GN vertical cuttings dryer treatment result for the discharged solids is OOC 3% to 5%.We also have standard design for drilling cuttings dryer system as a compact package for convenient transportation and operation.


There are different ways of feeding system to vertical cuttings dryer, including vacuum pump, drilling cuttings transfer pump, screw conveyor system.
Vacuum pump is 100% air operated pump, it can be widely used for electricity power supply area, and the space requirement is very small. It is the ideal equipment to transfer drilling cuttings, sand, cement, drilling fluids, waste water, oil sludge, animal waste, etc. materials, and the suction distance is up to 50m and discharge distance is max 1000m, especially for the high solids content material.


Drilling cuttings transfer pump is drived by hydraulic cylinder and S-style distribution valve, it can be used to transfer high solids concentration material, less moisture, big solids size and high abrasion material.
Screw conveyor system is traditional drilling cuttings transfer way, normally one set of screw conveyor picked the drilling cuttings from shale shaker, desander, desilter horizontally, one set of screw conveyor is installed slantly to pick up the drilling cuttings from #1 screw conveyor and transfer to vertical cuttings dryer. The installation space is larger than vacuum pump and cuttings transfer pump.
The vertical cuttings dryer discharged fluids flow to intermediate tank and the centrifuge feeding pump feed the fluids to decanter centrifuge to separate fine solids, the mechanical separation cut point is 2~5 microns. The treated fluids can be recovery to solids control system to prepare for new drilling fluids.