Author: desanderdesilter

Recently GN solids control shipped 4 units of desander units to domestic HDD contractor, the desander unit is also called economic mud cleaning system, which can be widely used for mud cleaning of TBM, Piling, micro tunneling, pipe jacking, HDD, etc. civil engineering works. With different treating capacity, we have GNMS-200B, GNMS-500D, GNMS-1000D for option. If the client need mud mixing and storage, they need to prepare for extra jet mud mixer connected with their storage tank as mixing and storage tank. The submersible slurry pump is installed vertically on top of mud pit to transfer the waste sludge to the desander unit. The composite material frame shaker screens on both top later and bottom layer of the double deck shale shaker is utilized for longer working life and reduce screen replacement time.

With economic cost, small footprint, compact design, easy operation, the desander unit is very popular for trenchless engineering companies. Normally a desander unit including a double deck shale shaker with proper qty hydrocyclones, 1 centrifugal pump, one catch tank to pick up the treated mud from first phase coarse solids separation shaker screens, the clean mud from hydrocyclones will flow to storage tank directly through pipelines.

For 200gpm mud cleaning unit, the hydrocyclone is 4 ea 4 inch desilter cone. For 500gpm mud cleaning unit, the hydrocyclone is 1 ea 10 inch desander cone, for 1000 gpm desander unit, the hydrocylone is 2 ea 10 inch desander cone, the centrifugal feeding pump model will be changed accordingly. All of the economic desander unit is a 2 phase cleaning unit, if the user need 3 phase cleaning unit, we will recommend our standard or customized design high configuration mud recycling system.
The operation cost of the desander unit is very low, the critical wear parts including pump impeller, seals, bearings and shaker screens, hydrocyclones.

One batch of VFD decanter centrifuge and screw conveyor are ready for shipment to waste water treatment company. As one of the professional manufacturer of decanter centrifuge in China, GN Solids Control can produce different size decanter centrifuges from 9 inch, 14 inch, 18 inch, 22 inch, 30 inch bowl diameter for different applications, including industrial waste water treatment, mining tailing treatment, dredging slurry separation system, HDD & construction waste slurry treatment, oil & gas drilling mud and drilling cuttings treatment, oil sludge treatment unit.

To transfer waste slurry with high solids content, 3 ways can be selected, screw conveyor system, sludge vacuum pump unit, drilling cuttings transfer pump. The screw conveyor is the traditional equipment to transfer waste slurry with continuous working. Each section standard length is 12ft, we can provide 12ft, 24ft, 36ft, 48ft length screw conveyor for option. The sludge vacuum pump is 100% air operated pump without electricity power supply, the discharge distance is up to 1000m, the suction distance is up to 50m, the max solids content is up to 80%, and max solids size is 75mm. The pressure required is 80 ~114 PSI, and air demand is 17m3/ min （600CFM）， the user should prepare the air compressor to supply air.
GN decanter centrifuge features as below:

1) Centrifuge straight bowl material is made of duplex stainless steel 2205 or 2304 by centrifugal casting, the cone section is made of stainless steel 316L, which is much better than other’s material SS304. The centrifuge collection box is made of SS304.
2) The screw is made of stainless steel 316L, and the impeller is protected by tungsten carbide tiles for longer working life, it is repairable once damaged. The open impeller design will increase the treating efficiency and separation performance.
3) The bearing is made of SKF brand for reliable operation.

GN solids control can design and produce both WBM waste treatment system and OBM waste treatment unit. The core equipments for WBM waste treatment system is high G drying shaker and VFD decanter centrifuge, the major equipments for OBM waste treatment unit is vertical cuttings dryer and VFD decanter centrifuge.

The working principal of vertical cuttings dryer is as below:
The major components of vertical G dryer including stainless steel screen basket, rotor assembly, bearing, individual oil lubrication system, control panel, main motor, oil pump motor, air knife to clean the screen basket to prevent it from blocking the screen basket, bell jar. By centrifugal force, the screen basket accelerates to 900rpm with 420G force, the liquid is forced pass through the screen opening, and the dry solids are extracted by flights to the cone, which rotate slowly than the screen basket. The flights are protected by tungsten carbide alloy with better abrasion resistance for longer working life. The fluids flow to intermediate tank through fluids discharge line, the dry solids are discharged from discharge port, the client can collect the cuttings by screw conveyor and transfer to cuttings container continuously. The oil on the cuttings in the discharged solids is below 5%, which can meet the environmental protection regulation for land fill. The fluids in the intermediate tank will be transferred to decanter centrifuge for ultra fine solids separation. The vertical cuttings dryer and VFD decanter centrifuge are installed on the same skid for convenient operation and transportation.

The cuttings transfer system including one horizontal screw conveyor and slant installed screw conveyor, or cuttings transfer pump with diesel engine drived, or vacuum pump which is 100% air operated pump to transfer the oil based drilling waste to vertical cuttings dryer system.
For more information, pls contact with GN solids sales.

GNMS-500D desander unit with 500gpm treating capacity are widely used trenchless engineering, bore piling project, micron tunneling, TBM slurry separation unit, etc. We strongly suggest users to stock one year operation spare parts with desander unit, the separation cut point of desander cone is 40 microns, if the clients need 3 phase cleaning with desilter cone, we have self contained mud recycling system with standard model for option.
We have economic configuration mud recycling system as below:

GNMS-200D with 200gpm treating capacity, separation cut point 40 microns.
GNMS-500D with 500gpm treating capacity, separation cut point 40 microns.
GNMS-1000D with 1000gpm treating capacity, separation cut point 40 microns.
The high contained mud recycling system including:

GNMS-200B with max 200gpm treating capacity, separation cut point is 20 microns.
GNMS-400B with max 400gpm treating capacity, separation cut point is 20 microns.
GNMS-600B with max 600gpm treating capacity, separation cut point is 20 microns.
GNMS-800B with max 800gpm treating capacity, separation cut point is 20 microns.
TBM slurry separation plant model including:

GNTBM-240 with 240m3/h treating capacity, 3 phase cleaning, separation cut point is 20 microns
GNTBM-360 with 360m3/h treating capacity, 3 phase cleaning, separation cut point is 20 microns
GNTBM-500 with 500m3/h treating capacity, 3 phase cleaning, separation cut point is 20 microns
Mud dewatering unit configuration as below:
VFD decanter centrifuge installed on the tank with chemical dosing unit, with VFD control panel, decanter centrifuge feeding pump, the mechanical separation cut point is 2 ~ 5 microns, with proper chemicals, the separation cut point is 1 microns, most of the fine solids can be removed. The compact design dewatering unit can be used for TBM slurry dewatering, dredging slurry dewatering, industry water dewatering unit.
If you need a customized solution for your trenchless engineering slurry cleaning, pls contact with GN solids sales.

Recently GN solids control shipped 2 units of GNLW554EP decanter centrifuges to our client in Yunan Province, China, they have a project to treat industrial waste water from an industrial area. As one of the most professional decanter centrifuge manufacturer in China, we have C series decanter centrifuge, Y series decanter centrifuge and P series decanter centrifuge.

Except for electricity drived decanter centrifuge ( fixed speed and VFD ), we also have full hydraulic drive centrifuge, the full hydraulic drive decanter centrifuge is used for high temperature ambient for heavy mud with variable bowl speed and differential speed.
“P” decanter centrifuge is dewatering type decanter centrifuge, it is used with dewatering unit as dewatering centrifuge unit, the main applications are for drilling mud, environmental protection sweage, oil sludge, chip fluids, sand washing water, mineral water, soda white mud, salt mud dewatering, etc. We have 6 models of P series decanter centrifuge, GNLW224EP, GNLW364EP,GNLW454EP, GNLW554EP, GNLW654EP, GNLW764EP. The GNLW554EP decanter centrifuge main power is 90KW+45KW, the drive system is VFD with PLC smart control, HMI interface, the bowl material is duplex stainless steel SS2205 by centrifugal casting, the screw material is duplex stainless steel SS2205 or SS316L, the screw impeller is protected by tungsten carbide tiles, the screw beach angle is 11 degree. The bearing is SKF brand for reliable and longer operation.
GNLW554EP decanter centrifuge should be working together with dewatering unit, the user can choose proper type chemicals which can improve the separation efficiency, we can help the client to make a lab test with the waste water samples to test the proper chemicals performance.
Except for industrial waste water treatment, GN decanter centrifuge can be applied for oil and gas drilling mud cleaning, drilling cuttings treatment, oil sludge treatment, TBM slurry dewatering, mining tailings cleaning, dredging slurry separation, etc. applications.

Recently we shipped one set of CBM mud recycling system for coal mining company in China, different with oil & gas drilling rig and HDD mud recycling system, compared with oil & gas solids control system, the CBM drilling rig mud recycling system is with less equipments, less storage capacity, less treating capacity required, smaller footprint. Compared with HDD mud recycling system, the CBM mud cleaning system use more equipments, more storage and mixing capacity, more treating capacity.

The CBM mud recycling system including the equipments below:
(1) 2ea of shale shaker as the first phase cleaning equipments to separate coarse solids, each screen with 3pcs shaker screens, total screen area is 2.63m2.
(2) 1ea of desander with bottom shale shaker and 1ea 10 inch desander cone as the second phase cleaning equipment, to separate the fine solids size 40 ~ 70 microns, the bottom shale shaker with 2pcs screens, the total screen area is 1.35m2.

(3) 1ea of desilter with bottom shale shaker and 8ea 4 inch desilter cone as the third phase cleaning equipment, to separate the fine solids size 15 ~ 40 microns, the bottom shale shaker with 2pcs screens, the total screen area is 1.35m2.
(4) 1 ea of middle speed decanter centrifuge as the fourth phase cleaning to separate the ultra fine solids size 5 microns to 7 microns. The vertically installed submersible slurry pump is the feeding pump of decanter centrifuge.
(5) 4 mud tanks with mud agitator, mud gun, mud tank accessories, valves, pipelines, connectors, electric control system as the treating, storage, mixing mud tank.

(6) 1 unit of jet mud mixer as the mixing unit of the mud recycling system to prepare for new drilling fluids.
(7) 3 units of centrifugal pumps as desander feeding pump, desilter feeding pump and mixing pump.

Vertical G dryer is ideal equipment to treat oil based mud drilling waste, the screw conveyor is matched equipment is to transfer the drilling waste to vertical G dryer. Recently one batch of vertical cuttings dryer and screw conveyor are ready for shipment to International Environmental Engineering Company. GN own made screw conveyor with features as below：

1） The upper cover or steel grating of the screw conveyor for quick switch or both available for customer’s option. The steel grating design is convenient for observation and maintenance.
2） The bearing brand is FAG or NSK for longer working life.
3） The material touch part– screw flights are made of wear resistant and thicker manganese steel, and also sprayed with wear resistant coating to extend the working life.
4） The screw conveyor reinforced frame is with high strength for horizontal and inclined installation. The inclined installation angle should be less than 45 degree.
5） The bearing sears are made of aluminum casting.
6） The inner bearing housing with self-lubricating HWS alloy hanging bearing core with grease filling nozzle to facilitate the injection of grease.
7） The good quality rubber sealing inside the shell cover plate to prevent the dust/ liquids leakage in operation.

8） The major components of screw conveyor including : bearing block assembly at motor side, intermediate hanger bearing and shaft assembly and tail bearing block assembly.
9） Each section to be made as 12ft length, we offer 1 section, 2 section, 3 section or 4 sections with different length for option.
The vertical cuttings dryer can treat the oil based mud drilling waste to drying cuttings with OOC below 5%, in some countries, OOC 5% is permitted for landfill or construction industry (to make bricks). In most developed countries, the permitted limit is OOC below 1% by TDU.

WBM waste treatment main equipments including drilling cuttings drying shaker, high speed/ VFD decanter centrifuge, drilling cuttings solidification unit, chemical dosing unit, the basical working process is as below:

2 units of drying shaker standard modular to be installed under the solids control shale shaker to pick up the water based mud drilling cuttings, the cuttings collection box is equipped for each drying shaker to collect the waste. The discharged fluids dropped into the catch tank under each drying shaker through shaker screens, the feeding pump transfer the fluids to VFD decanter centrifuge, which is installed on the telescopic skid with VFD control panel, the feeding pump is also installed on the centrifuge skid. The fluids from decanter centrifuge flow to intermediate tank ,the submersible slurry pump transfer the fluids back to solids control system reserve tank.

The discharged solids from drying shaker, decanter centrifuge, and the drilling waste collected by screw conveyor from desander, desilter, solids control decanter centrifuge are all feed to cuttings solidification unit, mixed with cement and lime (solidifying agent) in the vessel to get the dry disposal material, the solidified drilling waste can be used for landfill since the hazardous material will not leak, it is safe for landfill.
If the treated fluids will not be reused to prepare for new drilling fluids, and the user want to get pure water, chemical dosing system with VFD dewatering centrifuge will be used, the decanter centrifuge can separate cut point up to 1 microns by adding flocculants. The decanter centrifuge is drived by VFD control panel with self cooling system or air conditioner, which is positive pressurized, 3 VFD including main motor, back drive motor, pump motor.
If you need a customized solution for water based mud drilling waste treatment system, pls contact with GN solids sales engineer.

As the professional manufacturer of TBM slurry separation plant in China, GN Solids control can design and produce mud cleaning/ recycling/ mixing tank system for all kinds of solids and liquid separation applications. An efficient TBM slurry separation plant is the successful use of slurry supported tunnel boring machine (TBM) and pipe jacking machines. Normally the TBM projects are footprint limited, GN designed TBM slurry separation plant is with compact design and reliable performance, convenient maintenance.

Main features of GN TBM slurry separation plant:
1) Compact footprint, reliable working
2) Easy transportation, containerized size for convenient movement, the user can easily move it from one project to another.
3) 5 phase separation system for better result
4) Economic proposal and high configuration proposal for option based on different requirement

For example, if the project required solids separation cut point is only 45 microns, we will suggest economic proposal for GNMS-500D and GNMS-1000D, the treating capacity is 500gpm and 1000gpm, the desander cone installed on the double deck shale shaker, the feeding pump can feed to mud to desander cone and also work as transfer pump, the control panel also installed on the same unit. The mud discharged from desander cone dropped down to the mud tank as intermediate tank, it will flow to the storage tank finally.
If the client need a high configuration proposal with bigger treating capacity and the cut point is below 20 microns, we will provide GNTBM-240, GNTBM-360, GNTBM-500 models, for example, if the client required capacity is 800m3/h capacity, we will use GNTBM-360 with GNTBM-500 as combination system. If the user required capacity is 1000m3/h, we will use 2 units of GNTBM-500 slurry separation plant. And so on, 1500m3/h slurry separation unit with 3 units of GNTBM-500 system.
For more details, pls contact with GN solids sales.

As one of the professional manufacturer of solids control system, drilling mud cleaning system, drilling waste management system in China, GN solids control can produce mud cleaning system for both onshore and offshore project, we can make customized design for different requirement. Recently one unit of customized design mud cleaning system are ready for shipment to our customer, the technical configuration is as below:

1) Linear motion shale shaker: it is the first phase cleaning to reduce the solids content and separate coarse solids from the drilling fluids, the operator can use different API mesh shaker screens to adjust the density, viscosity of the drilling fluids to meet drilling requirement, a good performance shale shaker can reduce the drilling waste effectively. The 2ea Italy Oil brand vibration motor drive the shale shaker, the shaker screen fixed by wedges, the shaker deck bottom is made of stainless steel for better corrosion resistance.

2) Linear motion mud cleaner including desander cone, desilter cone and bottom shale shaker. desander cone is the second phase cleaning, desilter cone is the third phase cleaning, the desander cone and desilter cone are made of 100% PU for longer working life, the composite material frame shaker screens can last longer and the effective screen area is larger, the separation performance is better, the storage period can last longer.
3) Centrifugal pump, which can be used as mixing pump, desander/ desilter feeding pump, transfer pump, charging pump, trip pump, it is installed inside the frame for convenient transportation and lifting from land to offshore rig platform. The lifting pad can be certified by DNV as per client’s requirement. The pump casing and impeller material is ductile hard alloy for better abrasion resistance.
If you required drilling mud cleaning system for onshore or offshore project, pls contact with GN solids engineer.