Applied abstract algebra by Joyner D., Kreminski R., Turisco J.

By Joyner D., Kreminski R., Turisco J.

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While eliminating sulfur, nitrogen, oxygen impurities and most aromatic hydrocarbons, Group II base stocks can be produced from less expensive crude oils to provide improved oxidation life in high-temperature service, fewer environmental questions, lower pour points, and higher viscosity index. Following their more severe hydrocracking, Group III base stocks involve nearly complete conversion to branched-chain paraffins with a very high viscosity index (VHVI) above 120. 2 indicates the increased service life available in representative applications of Group II and III base oils (Khonsari and Booser, 2004a).

Stiffer Grade 3 greases are used in many prepacked ball bearings where a Grade 2 might be broken down by its close contact with the churning action of the rotating balls and their separator. Blocks of hard brick greases are inserted directly in the sleeve-bearing box of paper mills. Additives in greases usually include oxidation and rust inhibitors. Antiwear and extreme pressure additives, such as those of sulfur and phosphorus types, are included for heavy loads Lubricants and Lubrication 51 at low speeds where elastohydrodynamic action is insufficient to provide a full separating film between mating surfaces (see Chapter 15 for other details relating to grease life and performance factors).

VISCOSITY–PRESSURE RELATIONS The relations of viscosity to both temperature and pressure outlined here are generally satisfactory for analysis of the usual hydrodynamic oil films and behavior in conventional hydraulic and lubricating oil systems. 5 Increase in viscosity with increasing pressure for typical mineral oils: (—) paraffinic, (- - -) naphthenic, ↑ solid. (ASME, 1952) (Boosear, 1995. Copyright © 1995 John Wiley & Sons, Inc. ) up to 1400–3500 MPa (200 00–500 000 psi) in elastohydrodynamic films in rolling element bearings and gear contacts.

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