Maintenance of retarder of vertical centrifuge

Vertical Centrifuge uses centrifugal force to dry drilled solids in oil or synthetic base fluids. A stainless steel screen bowl traps “wet” solids and accelerates them up 900 RPM. Liquid is forced through the screen bowl openings, while “dry” solids are extracted by the angled flights attached to the cone, which rotate slightly slower than the bowl. Tungsten carbide protects the flights from abrasive solids and ensures long operational life. This aids in maintaining a constant gap between the scroll and screen bowl, which is crucial for proper operation. KOSUN Vertical Centrifuge has been done with strict balance testing for all major rotary components to minimize vibration & noisy.

Maintenance of retarder of vertical centrifuge:
1. For the first time, replace the oil after one-cycle operation. And replace it every 3-6 months later on. If the temperature goes too high or too humid, remember to shorten the period and to add oil.
2. Retarder is not lubricated when leaving the factory, so users should add enough lubricating oil until it reaches the designated height by oil standard.
3. When impact load is too much or startup too frequent, users should accesorize positioning pin or hydraulic coupling between base and footing, or demand a positioning slot or positioning plane upon the base.
4. Users should make it clear when placing the order if retarder output shaft should be installed upwards and negotiate over designing lubricating system.
5. Horizontal and lateral retarder should be installed about 15° inclined.
6. Vertical and luffing retarders adopt pump reciprocating lubrication. When input power is
7. It is regulated that retarder should use N220 industrial gear oil(horizontal one uses N150 gear oil), lubricating oil should comply with.
8. After installation, the input shaft of retarder should be rotated flexibly by hand and output shaft rotated by 360°, the resistance felt everywhere should be the same, and lubricating oil should be added to the designated height by oil standard. Then, connect the power to allow it run without load for 1-2 hours and increase load bit by bit if everything is alright.


Established in 1992, Xi’an KOSUN Machinery Manufacturing Co., Ltd. is a modernized producing enterprise integrating R & D, production and sales. It always pursues the tenet of “Human Oriented, Technology First, Customers Foremost”, stands still in China market with responsible and sustainably innovative spirits, provides one-stop, all-round specialized separation equipment and designing, manufacturing and system integration of drilling fluids solids control equipment as well as the best products and services to the customers.

Decanter centrifuge for different sludge treatment

Decanter centrifuge separates by the work principle of centrifugal sedimentation. The drilling fields usually apply spiral settling centrifuge which works on the basis of different component densities. It mainly removes 2~10μm solid phase from the mud as the last stage in solids control system. It has shared applications in both weighted and unweighted drilling fluids.

KOSUN oilfield drilling mud decanter centrifuge can meet with different requirements of mud treatment under various drilling conditions,that can do sedimentation and separation for particles more than 2 um. After treatment,the mud can achieve ideal viscosity and proportion, results in better recycling,high efficiency,saving and environment protection.

The series of drilling mud centrifuge by our company has been developed many years with the continuous improvement and optimization design,which possesses the characteristics of good result of separation and settlement,as well as large quantity, reliable work, longer life, lower energy consumption, easy maintenance, smooth operation, lower noises, etc.

To ensure that the effective treatment result and long service life ,the important parts adopts high quality stainless steel,forging material,strengthen heat treatment and strict control processing.And on each part that easily wear take spraying wear-resisting layer and mosaic of hard alloy etc.The overflow of the main drum mouth using adjustable poling board,it can be adjusted anytime according to different sludge treatment.

To meet the requirements of the development of modern drilling engineering, KOSUN developed and equipped with the explosion-proof variable frequency control system which could adjust separation factor and drum rotational speed.By this new technology,make the drilling centrifuge  adapt property changing of mud during the operation process,which makes the treatment more effective and perfect.

A VFD (Variable Frequency Drive ) module monitors and control both the main and back electric drives.The operator can manage bowl and scroll speeds via a touchscreen that also displays input from the various sensors,including temperature,current,rotational speed and vibration.


Besides, shale shaker for solids control are devices that remove drill cuttings from the drilling fluid while circulating and drilling. There are many different designs and research into the best design is constantly ongoing since solids control is vital in keeping down costs associated with the drilling fluid. The basic design consists of large, flat sheets of wire mesh screens or sieves of various mesh sizes that shakes or vibrates the drill cuttings, commonly drilling shale shaker, across and off of the screens as the drilling fluid flows through them and back into the drilling fluids processing system, often called a mud system.