Recently one unit of decanter centrifuge and desander unit are shipped to trenchless engineering company.
The mud decanter centrifuge model is GNLW452D, it is the popular model among GN decanter centrifuge for trenchless drilling mud treatment. The middle speed decanter centrifuge separation cut point is 5 ~7 microns, after long time operation, the ultra fine solids which can not be separated out by hydrocyclones will accumulate in the mud tank, which can not be reused directly, the customer need the decanter centrifuge to separate the solids up to 5 microns, the dewatering unit can be applied if required, then the clean fluids can be reused to prepare for new drilling fluids.


The mud cleaning desander unit is GNMS-1000D, with treating capacity 1000gpm, the separation cut point is 45 microns, the working process is as below: the submersible slurry pump feed the mud to desander unit bottom layer screen for coarse solids separation, the fluids drop into the catching tank under the double deck shale shaker, the centrifugal pump feed the slurry to desander unit for fine solids separation, the solids discharged are drying by top layer shaker screen to collect more useful fluids, the desander cone separation cut point is 45 microns. The clean mud flow to the storage tank directly, If the customer need mud mixing to prepare for new fluids, they can connect the jet mud mixer with the storage tank by flexible hose, the mixing hopper, mixing pump and pipelines, control panel are all installed on one skid .


Except for GNMS-1000D desander unit, we also have GNMS-500D, GNMS-200D mud cleaning unit with 500gpm and 200gpm treating capacity, based on client’s requirement, we can design customized mud cleaning system with mud mixing, storage, cleaning process with different capacity, we have economic configuration and high configuration mud cleaning system for option.

Recently one set of vibration shaker for liquid solids separation are shipped to environmental service company.


It is consist of 2 mud tanks, each tank with 1 unit of vibration shaker, 1 unit of centrifugal pump, 1 unit of mud agitator, 1 ea lighting, walkway, stairs, guard rails, valves, and pipelines, etc. accessories. The vibration shaker with water spray system to prevent solids blocking of the screen. For different applications, the shaker feeding system have different options as weir feeder, top box feeder, hopper feeder. In this system the shale shaker feeding way is top box feeder through pipelines on the top. The centrifugal pump’s impeller and pump casing are made of hard ductile iron alloy for better abrasion resistance, to protect the centrifugal pump impeller and pump casing, the shale shaker should separate most of the coarse solids from the liquid and the discharged solids should be as dry as possible. The shaker screen installed on the shale shaker is composite material frame shaker screen for longer working life, especially for the slurry with high solids content. The shaker screens are produced by GN solids control and comply with API RP 13C standard, the wire mesh is made of stainless steel 316L, the frame are made of composite material for longer storage life and durable working life.


For oil &gas drilling application, there are 2 vibration modes for option, linear motion and progressive elliptical motion to meet different requirement for their drilling fluid.
For solids liquid separation application, normally we only need linear motion with high G force up to 8.0 G for better drying performance.
The further treatment equipment after shaker is decanter centrifuge with dewatering unit, to separate more fine solids from the fluids and get pure water, most of the fine solids can be separated out up to 1 micron.

Recently one unit of GNMS-1000D HDD desander plant and GNMS-500D HDD desander unit, one unit of dewatering centrifuge GNLW554E-VFD, three set of mud mixing and storage system, one unit of jet mud mixer are shipping to engineering company.


The HDD/ TBM desander unit are a compact design mud cleaning system, the technical configuration is as below:
Double deck shale shaker with hydrocylones as 2 phase cleaning equipment, the first phase cleaning is coarse solids separation shaker screen, normally we use API 40 or API 60 shaker screen; the second phase cleaning is fine solids separation by desander cone, the solids are drop down to the fine mesh shaker screen to collect more useful fluids. One feeding pump for desander cone are installed on the compact mud tank with electric control panel, cable connection, pipelines and accessories. The cut point of the desander unit is 40 microns. The GNMS-500D desander unit with one unit of desander cone, the treating capacity is 500gpm; GNMS-1000D deander unit with 2ea desander cone, the treating capacity is 1000gpm. The shaker screen installed on first layer and second layer are both composite material frame shaker screen, the screen locking way is by wedges.


The dewatering centrifuge GNLW554E-VFD is used after the desander unit, the separation cut point is 2 microns, it can separate most of the fine solids, the big bowl big volume decanter centrifuge can meet the requirement of big tdewatering capacity, the recovery fluids will be storage at the 3 mixing & storage tank, the jet mud mixer can mix the fluids with powder chemicals to prepare for new drilling fluids, which can be reused to save drilling cost. The pipelines between 3 mud tanks are in parallel connection, so that the jet mud mixer can mix in any tank. Each tank with its mud agitator for better mixing.

Recently GN solids control shipped mud mixing system to trenchless engineering company, the technical configuration is as below:


One transfer pump installed on one side of the mixing tank to transfer the mixed drilling mud to other place. The mixing hopper and mixing pump installed on the other side of the mixing tank with proper pipeline fittings, the man hole, clean gate, handrails and stairs are equipped on the mixing tank. The centrifugal pump head is interchangeable with famous brand centrifugal pump, the pump casing and impeller are made of hard ductile iron for better abrasion resistance.


The other mixing tank is consist of mixing hopper, and 2 shear mixing pump with its individual control panel, another transfer pump is on another side of the mixing system to transfer the mud. The pump can cut the chemicals into small pieces for better mixing performance of the chemicals, 2 each round chemical mixing tank are located in the mixing skid, with mud agitator on top of the mixing tank and liquid level meter, pipelines, valves, etc. accessories are attached. The painting and coating color is customized as per client’s requirement.


Except for mud mixing system, GN solids control can also produce dewatering centrifuge package to separate fine solids and get water recovery. The dewatering unit consists of one unit of dewatering centrifuge, 1 unit of centrifuge feeding pump, 1 unit of chemical dosing unit, 1 unit of catching tank. GN desander unit for TBM, piling engineering company should be used before the dewatering centrifuge, desander unit including 1ea double deck shale shaker and hydrocyclones ( desander or desilter), feeding pump, transfer pump and catching tank, the function is to separate coarse solids from the slurry, the fluids can be reused or treated by the dewatering centrifuge unit to get clear water.

1 unit of GNSD-90 disc stack separator and 1 unit of GNLW-454ET decanter centrifuge are shipped to our domestic client. These equipments are for separation of oil ,water and solids.
The working process is as below:


The decanter centrifuge feed pump transfer the oil sludge to decanter centrifuge feed tube, in the meanwhile, the dewatering unit mixed the proper chemicals, the chemical dosing pump transfer the chemicals to static mixer and then to decanter centrifuge feed tube, the mixing oil sludge and chemicals are mixed well, so it will be easily to be separated out by decanter centrifuge, the solids size bigger than 2 microns will be separated out, the oil and water mixture fluids will flow to buffer tank, then feed to disc stack separator, to separate oil, water and little solids. The mixture fluids feed to disc centrifuge must be with solids content less than 3%, otherwise it will block the disc stack separator easily.
The technical specification is as below:
GNLW-454ET decanter centrifuge with bowl diameter 18 inch(450mm) , bowl length 74.5 inch (1890mm), max speed is 3500rpm, max G force is 3084G, bowl L/R ratio is 4.2, the main motor and back drive motor will be suggested by our engineer according to client’s material. The handling capacity will be also depend on the chemical to be used and treated material.


GNSD-90 disc stack separator for oil, water, solids separation:
Bowl diameter is 580mm, slide piston is 500mm, the max speed is 6150rpm, max G force is 12273G, motor power is 18.5KW, the starting time is 10 to 15 minutes, the major components of the disc stack separator is the bowl, the process effect is obtained by the rotating drum with high speed.
Except for decanter centrifuge and disc stack separator, to treat oil sludge, the user also need other accessories, pls contact with GN solids control for more information.