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GN solids control decanter centrifuge Installation
Centrifuge installation
1). Choose suitable lifting device and sling.
2). Cranes and slings can not bear excessive load, regular check shall be given to the slings so as to ascertain whether they are in good state.
3). The hall be checked before lifting to ensure that the strength of the sustained centers meet the requirement of hoisting.
4). Make sure the installation platform is firm enough to bear adequate weight.
5). Remove all the traportation protection device (bowl fixing belt, fasten belt and fixing bolts).
6). Connect inlet and outlet pipelines (use flexible joint for connecting point), overflow pipe, and solids discharge slot.
7). Connected with power supply (Switch controller between control panel and power supply is necessary to ensure safety of wiring).
Electrical installation
Warning:
A. Read carefully of centrifuge user manual and Control cabinet user manual before operating.
B. Strictly forbidden to open the control cabinet with power on. Only open the door after power cut off.
C. Any installation and inspection of electrics must be operated by professionals
The main motor, back motor and temp. sensors of VFD centrifuge has connected well to the aviation plug panel, users are supposed to connect cables with reference to VFD control cabinet user manual.
Operation
Preparation before operation
Ⅰ. Check below items to make sure all in good condition. Any abnormal conditions should be solved properly and in time.
1). Check and make sure all parts of the centrifuge assembled well.
2). Check and make sure the bowl fasten belts are removed.
3). Rotate the centrifuge bowl manually and check if there is any blocking or other abnormal condition.
4). Check and make sure the oil level of hydraulic coupler and gearbox is accordence with request.
5). Check and make sure the B-belt is suitably tensioned.
6). Check and make sure the belt covers and collection box top cover are closed well, bearing base, feeding pipe and control cabinet are screwed down well.
7). Check the 3-phase power supply is connected well.
8). Check the reset function of all switches, operating device, control bottom, and make sure they are flexible and in right position.
9). Check and make sure the control cabenit are mounted well.
10). When restart the centrifuge after long stop, measure motors with 500V megger insulation resistance, the centrifuge can be run only if the resistance ≥ 0.5 MΩ.
11). check and make sure the ground connection is reliable. Measure the grounding resistance if necessary.

Start the centrifuge temporarily to check the rotating direction. Change the phase conductors of the motor if the rotating direction is not correct.
1). Start and run centrifuge back motor in short time to observe whether the gearbox rotates in a correct direction, and make sure there is no adnormal condition occured.. Seen from the small end of the bowl, the gearbox shall rotate in counterclockwise.
2). Start and run centrifuge main motor to observe whether it’s pulley rotates in the correct direction, and make sure there is no adnormal condition occured. Seen from the small end of the bowl, the pulley shall rotate in counterclockwise.
3). Start in inching feed pump to observe whether it rotates in a correct direction. Observed from the end of the motor, the pump shaft shall rotate in clockwise.
Notice: ① Cut off the power immediately if the motor does not run after power to avoid it burn down
② When start the centrifuge, check whether the motor work continuously without abnormal noise. If the two motor could not work synchronously, operator should immediately shut
down the centrifuge for trouble shooting and then start the centrifuge again.
③ Motor is not allowed to start over five consecutively times in the cooling condition; When restart the motor after stop, it is not allowed to start over three consecutively times in the hot condition.
Ⅲ. No-load running
Start the centrifuge according to the operating steps, but do not start the feed pump to make it run without load. Check whether there is abnormal noise, vibration or heating. Make sure that the temperature rise of the bearing base is not over 35℃ after 2-hour running. If the condition permitted, measure the bowl speed and vibrating force of the bearing base and make sure that the bowl speed was not less than 97% of the rated figure and vibrating force was not over 7.1mm/s.
Ⅳ. Load running
Turn on centrifugal according to the operation steps, after it reaches the set speed, turn on the feed pump. Check and see if there is any abnormal situations e.g. abnormal vibration, noise, or heating, etc…
Choose the suitable pump feeding capacity according to the mud density & viscosity, and the performance requested to reach. DO NOT increase feed capacity sharply; it may cause block or the centrifuge and hold on the screw propeller badly.

GN solids control Basic requirement of disassembly and assembly.
(1). Disassembly
A． Not allowed to hammer directly onto centrifuge parts, not allowed to separate the connecting surface between parts with tools like screw drivers.
B． Must use the dismounting holes or pulling tools on centrifuge parts when disassembly.
C． Not allowed to heat roller bearing with welding torch.
D． When dismount the parts with dismounting holes on flanges, use forcing screw with level 8.8 or above.
E． Mark the matching parts with compact points before disassembly.
(2). Assembly
A． Assembly work should be done in clean workshop with no metal particles or powers in air.
B． Carefully clean all parts and air flush off all iron scraps and dusts from lubricate holes, blind holes, counter bores.
C． Inspect fitting surface and joint surface of parts, and polish wounds and scratches on the parts with fine oil stones and smooth cut files.

A．Disassembly feed tube:
1）Disassembly feed tube
2）Disassembly Bolt & Nut On feed tube
3）Push out feed pipe
B． Disassembly narrow V belt
1）Disassembly motor cover
2）Loose nut for fixing motor
3）Rotating adjust screw , shorten distance
4）Pull out narrow V belt
C．Disassembly gear box
1）Lift gear box , disassemble back-drive motor, remove coupling between motor and gear box
2）Disassembly nuts between gear box and connection part
3）Remove gear box, pull out spline shaft
D．Remove centrifuge main body
1）Open top cover of collect box
2）Disassembly locating pins and nuts on bearing base both end
3）Lift centrifuge bowl assy and remove it

In July in the north of China is a hot season, but the GN solids control workers who still hold on the production line, hot only to grasp the equipment ready, sent to the client as soon as possible, better realize his value. After The customer inspect site work my company oil sludge sand processing system, can more firmly believe that champions league in oil field strength in the field of environmental protection, at the same time also give high affirmation.
Oily sludge treatment system, mainly dealing with oily waste drilling platforms, including oil/water, oil, sludge, etc. GN  solid control according to the characteristic of oily waste in r&d and manufacture of unique, mainly includes the following several main structure.
Feeding unit: 1) oily sludge use oily waste on the screw conveyor in big funnel, again through the screw device to mixed evenly inside the tank are mixed. Screw of the funnel, transmission capacity and mixed tank can be customized production according to customer requirements.
2) flocculation unit: the unit of chemicals can be dispensed by the automatic control system according to the clients due to the proportion of matching, and then through a screw pump, the potion into mixed cans, mixed with oil waste.
3) the solid-liquid separation unit: this unit is made up of a high G of drilling fluid shale shaker and special mud centrifuge. Mixed with good oil bearing waste by screw pump pump to the shaker screen above the first, the big screen out particles, and in waste pulp centrifuge for further separation.So that you can maximize the crude oil in the wastes of isolated and stored into the tank.
Welcome there is oil sludge, joint station tank bottom sludge, sludge treatment of offshore drilling platform abandoned business customers to the company.

1. The screw conveyer is overload or out of power.
2. The screw propeller overload will cause back drive motor current overload, it will cause the the power supplier cut off. Oe if there are other reasons caused cut off of the power suppler, the screw propeller will be blocked. Operater should solve the problem per trouble shooting.
3. Overload of the bowl
4. The bowl overload will cause hydraulic coupler fusible plug be melt. The transmission oil inside the hydraucli coupler will flow Main motor will be disconnect with hydylic coulper and the bowl cannot be drived. In this condition, the main power supply will not be cut off automatically. Centrifuge operaters should stop feeding pump firstly, and then stop the power supplier. After that, change fusible plug and transmission oil. After that, open the flush pump to clean out the bowl inside, otherwise, it may cause blocking of the screw propeller.
5. Attentions for stop-off
6. Before stop off the centrifgue, be sure to clean the bowl inside thoroughly. Otherwise, when you start the centrifuge next time, the screw propelelr may be held on and could not rotate.
7. ATTENTION: Most of the common centrifuge broken down is caused by incomplete flushing.
8. When stop centrifuge in winter, or stop centrifuge for a long time, be sure to open collecting box top cover, remove the drain bolt at centrifuge big end cover, and drain out all water and fluids inside the bowl and hoses, to prevent freezing.
9. Operator DO NOT allow to leave the site until the centrifuge bowl completely stop rotating.
10. VFD Control Panel Notes
11. Layout of VFD control cabinet
12. The VFD control cabinet is separated with centrifuge, and should be mounted nearby the centrifuge and convenient for operation. In order to make it easy for operation and observation, it is better the VFD cabinet located within 5m far away from the centrifuge. Max. the distance should not over 10m. And cover the VFD cabinet with shade to provent rain or sunshine.

Cable size

13. User prepare suitable length cables per the final VFD control cabinet location. Centrifuge is connected to VFD control cabinet with thess cables: main drive motor, back drive motor, feeding pump motor, sensro device, and power supply. Cable sizes are as following:
14. 90kw main drive motor cable 3×70mm2+1×35 mm2
15. 37kw back drive motor cable 3×25mm2+1×16 mm2
16. 22kw feeding pump cable 3×10mm2+1×6 mm2
17. Sensor device cable 3×1.5mm2
18. Power supply input cable 3×70mm2+1×35 mm2 2pcs

After 30 days of intensive production, GN solid control for coalbed methane customized mud purification system smoothly completed, site quality inspection personnel is to run the test of each device, this is our final systemic test before delivery.In a few days the whole system will be sent to the customer site.
The completion of coalbed methane (CBM) mud solid control system is mainly composed of a high drilling fluid shale shaker, a mud cleaner and a centrifuge, mud slurry device and a jet of many sets of slurry blender and centrifuge pump, system assembly will soon after the completion of the CBM drilling for customers of the production tasks, the tight because customer construction project and first time use, to ensure the smooth construction of the customer, GN solid control will actively organize professional and technical personnel to the scene to do a good job of system installation and debugging and training.

Due to the customer request to our system is very high, so the crown to solid control strictly according to customer’s special requirements for production and installation.Use shougang steel, choose Siemens, schneider electric components, selection of international brand vibrating motor, it is repeatedly mentioned customers requirements.Customer on-site inspection in the process of production of production progress, customers mainly to see our production process and production process requirements, read our front-line workers conscientiously working condition and equipment of the production process can make them more confident to choose crown solids control is the most correct choice.
GN solid control is a leading domestic solid control system suppliers, in coal-bed gas field has more than ten years experience of equipment service, services across the United States, snow, Germany Bauer, Mr Ryan, and many other international drilling company and coal bed methane developers.We have rich experience in coal bed methane drilling solid control system, better able to provide customers with turn-key project, for customers to create higher profit margins.

1, mud mixing system
In 3 # aggravating tank side by side on the right side of the base to install two sand pump, slurry on the base to install 1 set of jet funnel, keeping a with a sand pump, two jet work alone; Sand slurry pump and jet funnel are interchangeable mutual through various import and export of the butterfly valve control. As shown in figure 6 (sand pump suction manifold slurry), sand pump via suction manifold can extract respectively 2 # mud tank of 3 # and 4 #, 3 # mud tank each tank, 4 # mud tank mud tank, by adding the corresponding slurry jet funnel material, pulp out the manifold again into the corresponding mud can respectively as shown in figure 7 (pulp out sand pump manifold); This cycle, testing can be for 2 # mud tank 3 # and 4 #, 3 # mud tank each tank, 4 # mud tank  configuration, added to meet the requirements of drilling technology; In 4 # shear mix slurry devices are installed on the mud tank, can through the valve control shear system and jet slurry system work at the same time, also can switch roles; Shear system by dosing pipeline supply to the medicine jar, through medicine pot can be added to the 2 # mud tank.
Jet funnel at the bottom of the tee handle butterfly valve parts installed a convenient and practical, the jet mixing slurry unit startup and shutdown, want to close the valve, need mixed weighted mud, etc. The whole system run smoothly after open the valve; After the aggravating or mixed, close the valve, then close the jet mixing slurry compound system.
2, mud transfer process
System installation of a complete set of mud gun and mud gun involved in 1 #, 2 #, 3 # and 4 # mud tank, tank and tank are connected with the intermediate pressure hose, sealing is reliable, easy installation and removal. Twelve (as shown in figure 1 # mud gun and water pipes), as shown in figure 13 (2 # mud gun and water pipes), as shown in figure 14 (3 # and 4 # mud gun and water pipeline), the whole mud barrel remit is composed of mud pump set pulp out of the manifold with mud, belongs to the medium voltage line (in 2 # were reserved in mud tank 2 inches of mud pump imports);Jet sand slurry pump can also be used to provide power source.
Have a gate on each of the mud gun, all can work alone; Is the main purpose of mud gun mixing and transporting mud., in the front of the 1 # mud tank is equipped with a supply tank, the tank is installed on a mud gun, the mud gun’s main function is to supply provides the mud tank, in order to drill in drilling process, lack of wellhead mud, mud is pumped by the supply pump pumping hold well, so as to complete the well supplies the function of mud.

GN can provide drilling cuttings dryer integrated solid control lever, including drilling cuttings dryer live body, electric control and cuttings dryer base stents, etc. Equipment designed and manufactured on the basis of “advanced, reliable, safe, convenient, economic” principle, the reliability and advanced nature, convenience and safety of domestic and foreign products at the same level reached advanced level. Equipment can adapt the characteristics of offshore operation, to meet the processing capacity of offshore drilling waste treatment while drilling, and cutting oil content less than 5% after processing, cutting emissions standards meet national levels. Equipment adopts frequency conversion motor, motor and adapt to 460 v60hz and 380 v50hz power supply range, and the motor and power distribution unit in accordance with national explosive-proof grade and offshore platform use requirements. Equipment dust, moisture, corrosion and good vibration resistance; Overall size is advantageous for the offshore installation location allocation, easy to transport hoisting and disassemble, easy replacement of spare parts and maintenance, use under conditions of normal operation.
GN solid control promise: quality guarantee period of 12 months, starting from the date of final acceptance of the agreement signed. During this period, due to supplier quality problems caused by the supplier to replace or repair free of charge, and the repair cost, labor, transportation, etc. The supplier shall be responsible for The consumption of solid control system equipment, such as: screen, scraper, belt, filter and so on are not within the 12 months warranty (if it is a manufacturer of quality problem, manufacturer is responsible for free replacement or repair);The quality guarantee period, if the supplier caused the quality problem of the design, manufacturing defects, the supplier must be responsible for free repair or replacement; Warranty period after-sales service service free of charge by supplier.
GN is the 1st API certified solids control company in China, also certified by: Europe DNV CE, HSE, ISO9001, Russia TP&TC .
2) GN Solids America is the first & biggest China owned USA based Solids Control Company. http://www.gnsolidsamerica.com/.
3) GN Solids Control facility Area: 40000㎡ (430,000 SF),exported to over 60 countries. http://www.gnsolidscontrol.com/china-factory/.

Engineering example

1 engineering general situation of a project is located in the northwest of pingdingshan, channel for the silty soil layers, the upper clay for 2-3 m, lower level of silt. Underground water level is low, the pipeline horizontally across the river total length of 560 meters, pipe composite pipe of 355 mm diameter.

2 construction design 1) guidance trajectory design basic parameters meet the specification requirements of the minimum curvature radius, R = 1500 dn = 750 m, because this project through the strata are mainly fine sand, gravel, clay, the difference of formation pore forming, poor stability, in order to reduce the bending stress of the pipeline, increase cross section through the radius of curvature of the pipeline to R = 2000 dn, R = 960 m.2) drilling Angle and radius of curvature in most through the construction of the grave Angle usually choose between 8 to 12 degrees, most of the construction should first drill a diagonal line, then drill a larger radius curve. The radius of curvature of curve is determined by the finished product pipeline bending properties, along with the increases IN diameter, steel tube radius of curvature of the thumb rule is 100 ft/IN (usually take 1000-1200 times the diameter of the pipe).Skew lines will guide hole curve according to guide to the design depth of the book, and then is a depth on this long straight and level, and then reach upward bending points to unearthed.The unearthed Angle should be controlled between 5 to 12 degrees, so that the finished products pipeline back to drag.3) through parameter design through parameter design are shown in table 1.4) drilling construction assembly table assembly of the engineering construction are shown in table 2.3.3 slurry preparation according to the geological data, determine the slurry preparation plan, the implementation of mud drilling, drilling in good preparation before 30 square mud with high quality.Mud plays a key role in directional crossing, we will adopt different according to different formation of mud, if the complex geological conditions, the requirements for the mud is higher, in order to deal with different situations, we will take the following measures: 1) according to the pre-determined ratio of slurry with good level of bentonite and mud additives, and meets the requirements of the mud.2) use of mud additives are: polymer HFEC, DFD – 140 fluid loss agent, lubricant, according to the different through geological conditions, determined to join different additives.3) in order to guarantee that the performance of the slurry, bentonite has enough hydration time, in the case of dosage can’t change, will be taken to increase the number of the mud tank.4) of waste mud treatment: dig a waste pulp in welding field collection pool, collecting waste mud, after precipitation treatment; In the drill ground also dig a mud recycling pool, mud after precipitation recycling pool, again through the mud recovery system recovery; Recycling is not the mud to the designated place.

4 pipeline towing guide hole back after grading pre expansion, hole cleaning, aperture to pipeline back to drag the required conditions, will test qualified through the pipeline on the skid frame and check after being dragged back. Is dragged back through the last step, also is the most crucial step, in the back to the way of construction is adopted in tow: Φ reamer 650 + 40 t drag swivel back + Dn500 crossline (Dn500 is 3 x + 1 x phi phi 250 MPP line 75 MPP line).When back to drag for continuous operation, to avoid sticking due to shutdown. Drag on the careful inspection of the rotating joint connection, connection head, reamer, determine the connection is firm may drag back, back to drag on both sides to strengthen the contact, coordination will be pipeline installation to the desired location.

5 1) pipeline protection pipeline back pulling the front line of prefabricated completed acceptance, acceptance of content: the quality of pipeline is unqualified, whether carried out in accordance with the design requirements for all line decoration, is in line with the pipe ovality, pull head do whether qualified, confirm qualified rear can back to party a notice.2) pipeline before must back to inspect, pipeline found peel off, replace pipe deformation and other issues must inform party a, in order to drag in unnecessary trouble and bring unnecessary economic loss to party a delay time into society to bring economic benefits.3) the last bore hole to improve the lubrication performance of mud, the last time back to drag to keep expanding the mud property, avoid significant adjustments to mud caused by the collapse of hole wall, add resistance to pulling.4) both ends of pipeline to drag must be checked before closed situation, pipeline back in place after the remained sealed on both ends of the line, make sure the line clean.5) pipeline back to drag process must have the specialist is responsible for the patrol inspection, leakproof personnel on-site promptly leakproof.

6, quality assurance measures are 1) the measures to prevent it is “S” type while drilling directional device adopts the DCI MARKIV positioning equipment, strictly control the whole Angle in the process of directional drilling rate, shorten the measured interval length as far as possible, especially in formation change or gravel, hard and soft parameter measurement spacing shall not be more than 2 meters. Adjust bearing in a timely manner, and have margin, banned repeatedly greatly adjust Angle, to prevent the “S” type.2) ensure that measures within the scope of directional drilling out the error in the design of a rig measurement is in place, using total station accurately release the centerline of the drill in place;The second point to parameters, accurate measurement calibration requirements carefully and as much as possible acquisition parameters comparison, to determine the best parameters, three different position at the center line of acquisition, and each location at least four times, and make records.3) to ensure smooth the reaming measures has been the guide hole, must meet the requirements of pipeline radius of curvature, especially not in “S” type curve;Second, according to different formation timely adjust mud, the cross section of formation is relatively complex, timely adjust the mud proportioning according to different stratum, appropriate control mud viscosity, increased fluid loss agent, lubricant and prevent collapse agent added amount, to stabilize the hole wall, reduce shrinkage, stable mud property, prevent significant adjustments to the mud, and cause the collapse of hole wall.4) measures to ensure the success of the back drag at the scene we prepare two electric hoist, to ensure the smoothly back to drag.4, the conclusion due to the complexity of the project for big diameter formation crossing, cross the strata are mainly fine sand, gravel, clay, the difference of formation pore forming, poor stability, the guide hole drilling, the thrust is bigger, request to anchor must be strong, mud performance to achieve high viscosity, good flow, appropriately increase the pump pressure, improve hydraulic horsepower.

Horizontal directional drilling technology
Using horizontal directional drilling crossing technology in pipeline crossing construction, digging the ground, can through the highway, railway, river, or even can pass under the buildings, is a kind of can safely and effectively for the construction method of environmental protection. Especially in environmental protection, municipal pipeline network reconstruction project and large pipeline crossing river engineering more show its unique advantage.
The working process of the horizontal directional drilling crossing technology is guide through the computer control and detection, to drill a pilot hole, the same as the design curve then guide hole enlargement, pull the product pipeline back to expand the pilot hole, with the construction process of pipeline crossing.Horizontal directional drilling and trenchless technology has been widely used in foreign countries, and also gradually spread in the country.1 horizontal directional drilling crossing construction technology for pipeline crossing using horizontal directional drilling construction, generally divided into two steps: the first step is to accurately as possible in accordance with the design curve of drill a pilot hole;The second step is to guide hole reaming, and the product line (typically, MPP, PVC pipes, PE cable casing, pipe, pipe, etc.) along the guide hole back to expand the pilot hole, the pipeline crossing work done.1.1 guide hole guide hole drilling is the key of the directional drilling, guide device adopt wireless or wired positioning system to determine the control to the scheme, mud and driller must pay attention to each link, the careful analysis of various parameters, cooperate with each other accords with a requirement to drill a pilot hole, drill pilot hole to contrast analysis of geological data and instrument parameters into a hole at any time, and always be each drill pipe guide hole record (thrust size, guide hole size, torque, etc.) to the difficulty of the operator to pay close attention to the change of pump pressure, torque, thrust.1.2 preliminary reaming after the completion of the guide hole, the drilling to expand to the appropriate diameter for finished product pipeline installation, this process is called reaming, usually, on the other side drill reamer is connected to the pipe, and then by the drill rotating dragged back into the guide hole, the guide hole enlargement, to a large number of mud pump into the hole at the same time, to ensure the integrity of drilling and not collapsed, and will be cutting the cuttings back to the ground.Guide hole completion, to unload in time after bit unearthed, fitted with a reamer for reaming.According to the geological condition and pipe diameter grading reaming, finally aperture D = 1.2 1.3 Dn (Dn for pipeline diameter).Reaming, adjust appropriately according to the design requirements when the mud displacement control back to the drag speed, smooth bore hole reaming in accordance with the design parameters, the operator to pay close attention to the pump pressure, the change of the torque and drag back, it is strictly prohibited to suppress pump, suppress drill, forced back to enlarge.Analysis, after the completion of reaming hole formation, again with a reamer hole cleaning when necessary.1.3 back to drag pipes bore hole has been completed, the finished pipe into the borehole.Piping prefabrication should be completed in the side opposite the rig.Reamer drill pipe at the other end is connected at one end by rotary joints from finished product line.Rotary joint can avoid product pipeline with reamer rotating, so as to ensure its smooth into the hole.Dragged back completed by drilling, this process also requires a lot of mud to cooperate, to drag process should be continued until the reamer and finished product pipeline from one side drill ground.2 the characteristics of the horizontal directional drilling construction 1) directional drilling crossing construction has not blocking traffic, won’t destroy green land, vegetation, will not affect people’s normal life and work order, solve the traditional excavation construction interference impact on the residents’ life.