Oil mist system

Oil mist systems exist to provide eontinuous minute quantities of oil fog to the rolling assembly. These systems normally employ an additional pump, atomizer, and filter. These systems are gaining popularity in hot applieations, or with heaty thrust and radial loading. The oil fog is sprayed into the bearing ehamber with either a wet sump or a dry sump. The wet sump method provides the bearings with a bath (the liquiei oil level) and a fog spray. See Figure 11-1. 

Bearings specified to be normally lubricated from a pure oil mist system shall be prelubricated prior to performance testing using a suitable hydrocarbon oil. 

Gear lube systems such as high-pressure greases, oil baths, and/or oil mist systems. 

For plants equipped with a lube oil mist system, the bearing housing has no liquid level, so water contamination of the lube oil cannot happen. 

The four stage exhaust box Includes the oil box separator, the demister pad, the oil mist eliminator, and the synthetic oil baffle. Additional features include ein automotive type spin-on oil filter, a built-in inlet anti-suckback valve that prevents oil from being drawn into the system when the pump is stopped, eind a built-in gas ballast, available on the RA version, which permits pumping with high water vapor loads. 

Although not widely used for gears, oil-mist lubrication is nevertheless worth mentioning here. It is a total loss technique in which the oil is supplied in the form of fine droplets carried by compressed air. Two virtues are that the lubricant can be carried long distances through pipes without severe frictional losses, and that no oil pumps are needed since the motive power is provided by factory compressed-air lines. However, unless such systems are totally enclosed, the exhaust can create a build-up of oil-mist in the atmosphere. In order to maintain good standards of industrial hygiene, it is recommended that... 

It should also be mentioned that low oil viscosity at low temperatures is desirable in the new small 4 cylinder and V-6 cylinder fuel economy automobiles ( 5, 6). This is to permit sufficient speed of engine cranking for cold weather starting at winter temperatures. Low oil volatility must be maintained to prevent oil misting and blowby from poisoning the catalyst system and oxygen sensors in the anti-pollution devices (7). 

All exhaust from a mechanical pump should be vented to a fume hood regardless of the room s ventilation quality or the type of pumped gases. Each time you bring new samples into vacuum conditions, your system is pumping at atmospheric pressured Because pump oils have low vapor pressures, and pump oils themselves are considered nontoxic, there is little concern for breathing pump oil mist. However, there may be dangers from trapped vapors within the pump oils. Regardless, there is little reason to breathe the pump oil mist if it can be avoided. Check with the manufacturer or distributor of your pump for an oil mist filter for your pump. If you use a condensate trap, be sure you position your exhaust line so that material does not drain back into the pump (see Fig. 7.14). 

Gastric emptying by either lavage or vomiting is contraindicated since there is a danger of pulmonary aspiration and subsequent pneumonitis. If a person is overexposed to oil mist, the victim should be moved to fresh air as quickly as possible and monitored to make sure that chemical pneumonitis is not present. If acute effects of central nervous system depression are present, the appropriate treatment may be indicated. 

Optimum selection of lubricant delivery devices based on equipment performance needs drip, circulating, oil mist, splash oiled, constant-level oilers, single-point lubricator, grease fittings, centralized lube system, spray systems, etc. 

All the pyrolysis vapors produce an oil mist following rapid quenching, but their polar character allows the easy utilisation of electrostatic precipitation in the recovery system of a pyrolysis process. 

The output of air compressor systems shall be tested for air purity every 6 months by means of samples taken at the connection to the distribution system, except that non-oil lubricated compressors need not be tested for oil mist. 

Filters — The use of an air purifying filter, is recommended for man cooling systems. It will serve two men in full suit systems (total flow of 50 scftn). The filter contains several filter materials, including activated charcoal, and will remove mists (including oil mist), water vapor and particles (down to 0.5 n in size) from the compressed air supply. Most important, it cleanses the air of any objectionable odor. The compressed air system should be tested for CO content. 

Figure 6.17. Typical data generated by the Amherst Process Instruments Inc. Aerosizer for aerosol systems, and powders aerosolized prior to characterization smdies. a) Calibration using aerosols of standard latex spheres of known size, b) Characterization of a mixture standard of polystyrene latex spheres, c) Characterization of a sample of 5 micron silica microspheres mixed with a small number of 10 micron microspheres. D) Glass spheres used in reflective paint (ballotini). E) Two oil mists diatacterized by direct injection into the Aerosizer .

I m older now, and much wiser. As discussed in the following section, use of an oil mist lubrication system eliminates all of the problems with erroneous oiler glass level indications and with moisture in the lube oil. 

However, I now understand that the oil mist lubrication system is superior to the wet sump system. In the oil mist method of bearing lubrication, a small stream of air containing atomized lube oil is... 

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