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20.12 LUBRICANT STORAGE
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The storage of lubricants, like that of any other class of goods, depends first on making rational decisions about the number of varieties and the quantities which it is necessary to store. The special factors which then need to be considered in storing lubricants are as follows: 1. Lubricants are an integral part of the precision components in which they are used. They must therefore be treated as precision components and protected carefully against contamination by dirt, water, or other materials. Never store them in the open. 2. Because most lubricants are liquids, they have no characteristic shapes, and it is very easy to use the wrong lubricant in a machine. This is always undesirable and sometimes catastrophic. So it is important to label lubricant containers carefully and to control their issue and use. 3. Some lubricants deteriorate in storage, and it is important to use supplies in proper rotation and ensure that storage lives are not exceeded. 4. Many lubricants are flammable, and special precautions are necessary to reduce fire risk. 5. Lubricants are slippery, and spillages can cause accidents. Floor gratings and drainage channels should be supplied, and absorbent powders or granules kept available to absorb spilled oil. 6. Oil drums are very convenient and satisfactory containers for storing lubricants, but water can collect in the recessed top and enter even through sealed apertures to contaminate the contents. Drums should always be stored horizontally and never upright.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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REFERENCES
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20.1 A. R. Lansdown, Lubrication: A Practical Guide to Lubricant Selection, Pergamon, New York, 1982. 20.2 M. J. Neale (ed.), The Tribology Handbook, 2d ed., Butterworth, London, 1996. 20.3 D. Godfrey, Boundary Lubrication, in P. M. Ku (ed.), Interdisciplinary Approach to Friction and Wear, NASA SP-181, 1968.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Source: STANDARD HANDBOOK OF MACHINE DESIGN
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R. Bruce Hopkins, Ph.D., P.E.
The Hopkins Engineering Co., P.C. Cedar Falls, Iowa
21.1 ELASTOMERIC SEAL RINGS / 21.1 21.2 SEALS FOR ROTARY MOTION / 21.4 21.3 SEALS FOR RECIPROCATING MOTION / 21.9 REFERENCES / 21.15
21.1 ELASTOMERIC SEAL RINGS
Seal rings of the O-ring type are used as both static and dynamic seals. Static seals serve the same purpose as gaskets; that is, they provide a seal between two members that are not intended to undergo relative motion. Dynamic seals, however, are used where rotating or reciprocating motion is intended to occur. O-rings are molded to the size of the elastomeric material with a circular cross section, as shown in Fig. 21.1a. The size is designated by the cross-sectional diameter w and the nominal inside diameter (ID). The standard sizes specified in SAE J120a are summarized in Table 21.1. The first size number in a group is associated with the minimum inside diameter, and the last size number is associated with the maximum inside diameter. Some manufacturers provide additional sizes that extend the range of inside diameters for a particular cross-section size. The nominal inside diameters were selected to provide dynamic seals in cylinder bores dimensioned in inches and common fractions of inches. Either SAE J120a or manufacturers recommendations should be consulted to obtain the recommended compression of the cross section. The compression is different for static and dynamic applications. The rectangular-section ring in Fig. 21.1b is manufactured by cutting lengths from a tube of molded material. The standard sizes listed in SAE J120a are summarized in Table 21.2. The first size number in a group is associated with the minimum inside diameter, and the last size number is associated with the maximum inside diameter. Rectangular-section rings are suitable for static applications with pressures up to 1500 psi [10.3 newtons per square millimeter (N/mm2)]. The standard shape of groove for sealing rings is shown in Fig. 21.2. The actual groove dimensions depend on the type and size of the seal ring cross section and the nature of the application. Recommended groove dimensions are provided in SAE J120a and in the manufacturers literature. Because elastomeric materials are almost incompressible, it is necessary to provide sufficient volume for the seal ring in the groove. The recommended groove dimensions do so. For static seals, a finish on surfaces contacted by the seal ring that is rougher than 32 in (0.8 m) may lead to leakage. Because rough finishes accelerate seal wear in dynamic seals, a surface finish of 5 to 16 in (0.13 to 0.4 m) is preferred. Friction is
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