Ep antioxidant antifoam pour point depressant

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Unformatted text preview: ur point depressant Protections against abrasion and scuffing Gears (steel/bronze) Paraffinic Oiliness Antioxidant Reduce friction, temperature rise, wear, and oxidation Machine tool slideways Paraffinic or naphthenic Oiliness; tackiness Maintains smooth sliding at very low speeds. Keeps film on vertical surfaces Hermetically sealed refrigerators Naphthenic None Good thermal stability, miscibility with refrigerant, low flow point Diesel engines Detergent Dispersant Antioxidant Acid-neutralizer Antifoam Antiwear Corrosion inhibitor Vary with type of engine thus affecting additive combination Paraffinic or naphthenic Reference: Neale, M.J., Lubrication: A Tribology Handbook. Butterworth-Heinemann Ltd., Oxford, England. do not suggest or imply that lubricants listed as being equivalent are identical. The lists do indicate that the two lubricants are in the name class, have the name viscosity, and are intended for the same general use. The chart of interchangeable industrial lubricants lists the following categories: ! General purpose lubricants ! Antiwear hydraulic oil ! Spindle oil 13-7 EM 1110-2-1424 28 Feb 99 Table 13-3 Importance of Lubricant Properties in Relation to Bearing Type Type of Component Lubricant Property Plain Journal Bearing Rolling Bearing Closed Gears Open Gears, Ropes, Chains, etc. Clock and Instrument Pivots Hinges, Slides, Latches, etc. 1. Boundary lubricating properties 1 2 3 2 2 1 2. Cooling 2 2 3 - - - 3. Friction or torque 1 2 2 - 2 1 4. Ability to remain in bearing 1 2 - 1 3 1 5. Ability to seal out contaminants - 2 - 1 - 1 6. Temperature range 1 2 2 1 - 1 7. Protection against corrosion 1 2 - 2 - 1 8. Volatility 1 1 - 2 2 1 Note: The relative importance of each lubricant property in a particular class of component is indicated on a scale from 3 = highly important to - = quite unimportant. Reference: Neale, M.J., Lubrication: A Tribology Handbook. Butterworth-Heinemann Ltd., Oxford, England. ! Way oil ! Extreme pressure gear oil ! Worm gear oil ! Cling-type gear shield (open gears) ! General purpose extreme pressure lithium based grease ! Molybdenum disulfide extreme pressure grease. (5) Spindle and way oils are not widely used. One of the last three classes on the list is a special preparation for open gears and the other two are classes of grease. General purpose oils, antiwear hydraulic oils, and EP gear oils are best described by comparison with the nonspecialized industrial oils discussed earlier. Nonspecialized oils contain a category called general purpose oils. This term is also used in the PEM list but it differs from the previously described general purpose oil category in that the additives may not be the same. In some cases, brand names indicate that EP additives have been included. In other cases, AW is indicated but not R&O. This raises the possibility that R&O additives are not present. AW hydraulic oil is a general purpose oil, but its antiwear properties are sufficient to pass the Vickers vane test for hydraulic applications when this is required. (6) The EP gear oils should correspond to those described under nonspecialized industrial oils except that EP additives are included and viscosities may be as high as ISO 2200. The EP classification of gear oil should not be confused with the SAE gear oil classification which is for use in automotive gear systems. SAE gear oils are formulated differently and are not discussed in this manual. 13-8 EM 1110-2-1424 28 Feb 99 (7) While grease preparation varies greatly among producers, only two types are given in the PEM list: No. 2 lithium EP and molybdenum disulfide EP No. 2. These are the two most widely used industrial greases. The name molybdenu...
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This note was uploaded on 02/09/2012 for the course MECH 84 taught by Professor Mba during the Spring '11 term at LDSBC.

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