Monthly Archives: September 2014
Why choose DC Desilters
Desilter is the third class solids control equipment to treat the drilling fluids. According to the size of the cone diameter, they are divided into Desander and Desilter. Desilters are designed to remove silt-sized (12-74 microns) solids from drilling fluids. DC desilters are simple to operate and easy to maintain.
The main parts of desilter is the hydrocyclone. The desilter is generally designed by with 10, 12, 16 or 20 cones, 4′ or 5″ in diameter. Each hydrocyclone is attached to a 6″ or 8″ manifold with a 2″ inlet and 2″ outlet. It has quick connect fittings on both inlet and outlet and the manifold ends.
The hydrocyclone is designed with a cylindrical feed section, a conical section leading to the solids discharge opening and an inward extending overflow outlet. Hydrocyclones are very effective classification devices which, as a result of centrifugal forces in the spinning fluid, cause solids to be separated at the under flow. Hydrocyclones are simple and inexpensive devices relative to the amount of material they remove.
DC’s polyurethane hydrocyclone offers a high volume 4” cone, while providing contractors an economical replacement for less efficient older equipment. DC hydrocyclones are manufactured using a specially formulated EU polyurethane which has excellent resistance to heat and abrasion.
Features of DCLW600-1500 decanter centrifuge
DC’s high speed, high performance decanter centrifuges are ruggedly built for industrial service and are especially effective in environmentally sensitive areas. With their robust construction and corrosion-resistant materials, DC centrifuges provide long service lives and have low maintenance costs even in the toughest environments.
DC’s 600-1500 high speed, decanter centrifuges deliver high recovery rates and efficient solids separation to significantly reduce disposal costs or reclaim valuable material from process streams. The 600-1500 centrifuges are precision-balanced for smooth operation over long periods at high RPM speeds, generating extremely high G- forces.
Features of these centrifuges include rugged construction and corrosion-resistant materials; three-port feed tube; back drive speed adjustable from -18 to +85 RPMs; and tungsten carbide scroll points.
The 600-1500 decanter Centrifuges boast infinite speed adjustability of main bowl drive and backdrive (differential). Utilizing variable frequency drives on all motors allows low amperage start-ups and eliminates troublesome sheave changes. Stainless steel wetted parts, tungsten carbide hard facing on bowl and scroll, as well as superior gearbox construction make it durable and rugged.
Introduction of hydrocyclone capacity
Since most hydrocyclones are designed to operate at a constant 75 feet of head at the input manifold, and flow rate through any cone is constant at constant inlet pressure, flow rate through any cone is predicatable.
Hydrocyclones are rated from 40 to 80 gpm of liquid removal. The normal 4-inch cones will remove 4gpm of solids, or 5.7 barrels per hour of solids, per cone. Therefore, the standard 16 cone arrangement will accommodate removal of 510 cubic feet of solids per hour. For 17.5 inch hole, this equates to penetration rates averaging 297 feet per hour. Clearly, if design and operational characteristics are adequately maintained, more than ample solids separation can be effected.
The accelerated gravitational forces generated in hydrocyclone are increasely proportion to the radius of the cyclone cylinder. Thus, the larger the diameter, the hydrocyclone, the coarser its cut point and greater its throughput. The smaller its cut point and greater its throughput.
The smaller the cone, the smaller size particles the cone will separate. In other words, the median particle size removed decreases with cone diameter. Median particles size also increase with increasing fluid viscosity and density, but decreases as particles specific gravity increases. Oil-field hydrocyclones range between 4 and 12 inched, bases on the inner diameter of the intake cylinder. A small hydrocyclone diameter is used for ultra-fine-separation.
What does Vacuum Degassing mean?
Vacuum degassing is a technique of removing dissolved gas from a liquid solution by lowering the pressure inside a vessel containing the solution. Vacuum degassing is often utilized in:
Water treatment
Laboratory testing
Soil purification
Vacuum degassing is the only way to make certain grades of steel that are particularly useful in the automotive, aerospace and railroad industries.
This process is also utilized for analyzing a material under controlled conditions including:
Air pressure
Temperature
Humidity
Altitude
Electromagnetic radiation
Microwave radiation
Vacuum degassing to remove carbon not only reduces imperfections, but also makes metals more ductile, or easily shaped and formed through cold metalworking.
Mud agitators used in drilling mud system
Mud agitator is a special stirrer, under normal circumstances can not simply be an agitator chemicals, petroleum refining, food and other industries use to move over. Mud Agitator adopts the blender cycloid speed reducer, and it is applied to the drug liquids mixing tank.
Mud Agitator is used in mud systems to suspend solids and maintain homogeneous mixture throughout the system. A mechanical agitator is driven by an explosion-proof motor,coupled to a gear box that drives the impeller shaft. The impellers (turbines) transform mechanical power into fluid circulation or agitation. The objective is to obtain a uniform suspension of all solids.
The agitator main part is impeller. Impellers convert mechanical power into fluid movement, much like the impeller of a centrifugal pump. Considerable study has been devoted to proper impeller design and placement. Even impeller transmits power to the fluid in two ways:
1. Pumping ability
2. Shearing ability
Mud agitator has the advantage of compact structure so it occupies small area. More than 7.5 kW Mud Agitator uses the turbo and worm gear speed reducer, with the large torque transmission, the revolution is steady, it works reliablely and has great merit. Common model of mud agitator is JBQ5.5kW, JBQ7.5kW, JBQ11kW and JBQ15kW.