The Oil Mist principle was developed by a bearing manufacturer in Europe during the s. The problem that nurtured this development was the inability to satisfactorily lubricate high-speed spindle bearings on grinders and similar equipment. The speed of these bearing was too high for grease lubrication, and liquid oil generated too much heat through fluid friction, necessitating an expensive recirculating system. Continuous thin-film lubrication with Oil Mist provided a solution. The purging and slight cooling effects of the carrier air gave additional benefits.
Pet peeing. Advances in Oil Mist Application Technology
The Oil mist lube stream is then passed through a settling tray allowing the bubbles to come to the surface. The below-listed components for Oil mist lubrication are the minimum requirement. Thank you! Oil mist is an aerosol mixture of very small oil droplets one to five microns suspended in air with the appearance of smoke. Download Brochure. To South riding storm sliding surfaces, journal bearings and the like, the resulting wet spray then runs down adjacent surfaces in arrangements such as those shown in Figure 5. In this article, we will see the Oil mist lube mist lubrication and oil mist Oil mist lube Working Principle. It will create low pressure and cause the oil to be siphoned from the reservoir. Past problems with wax and additive separation from mist oils are now avoided by using naphthenic base stocks, and by not using oil additives that might be deposited upon encountering water Oil mist lube. Performance is sensitive to temperature. Leave a Reply Cancel reply Your email address will not be published.
In this article, we will see the oil mist lubrication and oil mist lubrication Working Principle.
- With improvements in oil formulations, oil mist lubrication systems are becoming increasingly popular in a variety of applications where only limited oil feed supply is required.
- A few years ago, a well-known lubricant and services provider conducted a survey of eight large U.
- A PurLube system draws lubrication oil in for treatment through a kidney loop off of the main lube oil console.
- In this article, we will see the oil mist lubrication and oil mist lubrication Working Principle.
Oil mist lubrication oils are applied to rolling element antifriction bearings as an oil mist. Neither oil rings nor constant level lubricators are used in pumps and drivers connected to plant-wide oil mist systems. Oil mist is an atomized amount of oil carried or suspended in a volume of pressurized dry air. The oil mist, actually a ratio of one volume of oil suspended or carried in , volumes of clean, dry air, moves in a piping system header.
The point of origin is usually a mixing valve the oil mist generator , connected to this header. Branch lines often feed oil mist to hundreds of rolling elements in the many pumps and drivers connected to a plant-wide system. At standstill, or while on standby, pump and driver bearings are preserved by the surrounding oil mist, which exists in the bearing housing space at a pressure just barely higher than ambient. These pump and driver bearings are lubricated from the time when atomized oil globules join or wet out to become larger oil droplets.
As of April , over , process centrifugal pumps are operating with oil mist as the sole bearing lubricant. The estimated number of electric motors on pure oil mist exceeds 50,; several of these at a Texas Gulf Coast petrochemical facility have been in flawless service since Oil mist technology is mature and has been in highly successful plant-wide use since the early s. However, both oil mist and oil spray applications can take credit for lower frictional losses and both should be taken into account while performing cost justification analyses.
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Some time will be change due to the Oil Mist Lubrication manufacture and purchaser requirements. Automotive engine oils should not be used because their mistability varies widely. Basic Oil Mist Generators Pressure of this inlet air is regulated to properly deliver the oil. Figure 2. Examples include bearings of electric motors, pumps and compressors in many oil refineries and petrochemical plants 1 ; gears, cams, chains and sliding surfaces of machines in steel and paper mills; construction equipment and an increasing range of other industrial applications.
Oil mist lube. How it operates:
Oil Mist and PurLube | CIRCOR
The Oil Mist principle was developed by a bearing manufacturer in Europe during the s. The problem that nurtured this development was the inability to satisfactorily lubricate high-speed spindle bearings on grinders and similar equipment.
The speed of these bearing was too high for grease lubrication, and liquid oil generated too much heat through fluid friction, necessitating an expensive recirculating system.
Continuous thin-film lubrication with Oil Mist provided a solution. The purging and slight cooling effects of the carrier air gave additional benefits. The Oil Mist generator resulted later from this development and used a small amount of air to produce a dense concentration of small oil particles.
In , air heaters were developed because it was discovered that, by heating the air used to generate Oil Mist, oils of just about any viscosity could be atomized.
Today Oil Mist is still used to lubricate high speed spindles in grinders. Included in the increasing range of Oil Mist applications are systems applied to all types of other machine tools, web and sheet processing equipment, belt and chain conveyors rolling mills, vibrators, crushers, centrifuges, kilns, pulverizers, ball mills, dryers and liquid processing pumps. Oil Mist is a centralized system in which the energy of compressed gas, usually air taken from the plant supply, is used to atomize oil.
Oil is then conveyed by the air in a low pressure distribution system to multiple points of lubricant application. The compressed air is passed through a venturi. Oil, siphoned from a reservoir by the air flow, is atomized into a fine spray. Baffles downstream from the venturi nozzle causing the larger oil particles to coalesce and return to the reservoir. The remaining air-oil-mixture is Oil Mist. Air-borne oil particles are then "wetted out" by impinging upon bearing surfaces rotating at sufficient speed to cause adherence and the formation of larger drop sizes.
Because there are no moving parts in the basis Oil Mist generator system, and because the system pressure is very low manifold pressures from 5 to 40 inches of water , it is a reliable lubrication method. Also, the system can be interlocked with machine operation or an alarm system to ensure proper functioning. This system is ideal in that a metered amount of oil approaching optimum can be provided to the bearing for proper lubricity. Lubricant friction itself is virtually eliminated.
Keep in mind that grease is used only as a "carrier" for those oils within it which provide lubricity. The oil mist provides a flushing action with fresh, clean lubricant and acts in a slight manner as a bearing coolant. The carrier air used to distribute the oil provides additional benefits in that it maintains bearing housings under slight positive pressure and the "outward" air flow prevents the entrance of contaminants.
Where mist systems run continuously - and when motors are inoperative - problems with condensation reaching bearing surfaces are eliminated. Maintenance "human factor" problems are reduced: Over-greasing, lack of replenishment of the proper grease and the right amount at the right time.
It has been determined that our horizontal ball bearing motors are compatible with oil mist systems, keeping in mind the following necessary features and modifications:. At the present time we will supply modified TEFC motors which are compatible with Oil Mist systems, but will not provide system components or assume total system responsibility. As a motor supplier, our position is that the bearing must "see" a proper flow, mixture and quality of mist.
There should be no pre-condensation of the mist waxing of the lubricant clogged nozzles etc. Note, however, that a conservative standard of 0.
Note that the system should be designed such that bearing cavity pressure will be approximately 5 inches of water minimum.
This will prevent contaminants from entering this cavity. Also note that bearing rolling elements must have a velocity of linear feet per minute minimum when mist fitting is used in order for oil particles to "wet out" as they impinge upon ball surfaces. Since we have no control over lubrication other than the initial amount of grease and since this grease is eventually purged by the mist, we should provide a conditional statement to our Warranty similar to the following:.
Mixture of mist should be approximately 0. The mist generate must be run continuously when the motor is inoperative. Also, the system should have adequate alarms to flag a malfunction and effect shutdown of the motor.
Currently vertical motors are not approved for oil mist lubrication. In the interim, however, refer any inquires of significant volume to our headquarters office in St. A Nidec Brand. Oil Mist Lubrication. Mist Generator Systems Oil Mist is a centralized system in which the energy of compressed gas, usually air taken from the plant supply, is used to atomize oil.
Our Position: Product Modifications It has been determined that our horizontal ball bearing motors are compatible with oil mist systems, keeping in mind the following necessary features and modifications: "Regreasable" motor construction. Open bearings with bearing caps. Grease inlet in upper bracket quadrant standard.
This maintains a "dry sump" system and minimized accumulation of churning of oil. Drain should not be located directly in air flow from fan copper or galvanized steel tube extensions should be supplied where this is the case. Vents should be about twice the area of inlets. EXAR leads must be used. Silicon rubber should be avoided due to potential swelling. Very small particles of mist will enter the motor regardless of bearing caps, seals, etc. Motors should be supplied with grease intact, for protection during shipping and storage.
Before connecting to a mist generation system, vents grease drain hole must be opened. Then the grease inlet channel should be cleared with clean, dry, low pressure compressed air so that mist will flow into the bearing cavity. All Right Reserved. Patent and Trademark Office.