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Fasteners — An Important Part of the Gasketed Connection
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English
Abstract
A variable usually overlooked in a gasketed connection is the bolting system. Proper design and selection of the bolting system can provide an extension of gasket life by orders of magnitude. One of the most important factors is the bolting system's overall spring constant. Spring constant affects not only torque loss, but the gaskets dynamic loading. A high spring constant system will have a higher per cent torque loss than a low spring constant system. Lowering the spring constant reduces the so-called pounding of flanges causing the gasket to crush and fail. It allows the gasket to absorb the bolts cyclic loading by transferring it to a larger gasket area. Spring constant is lowered by reducing bolt diameter, increasing bolt length and, if possible, reducing the number of bolts.
When flanges are made of dissimilar metals, bolting plays a most important part in obtaining and maintaining a satisfactory seal. The fasteners as well as the gasket must be able to compensate for difference in expansion of the different flange materials. The old, never forgotten rule -- if leakage at a flange is observed, use larger bolts and higher torque -- must be repealed.
Authors
Citation
Easton, J. and D'Olier, G., "Fasteners — An Important Part of the Gasketed Connection," SAE Technical Paper 680501, 1968, https://doi.org/10.4271/680501.Also In
References
- Mancy G. A. “Predicting Bolt Tension.” Fasteners 3 5
- Fasteners Data Book, Industrial Fasteners Institute, Cleveland 15 Ohio
- Faires V. M. “Design Of Machine Elements.” New York The Macmillan Co.
- Almen J. O. “Tightening Is a Vital Factor in Bolt Endurance.” Machine Design 16 2 158
- Dolan T. J. McClow “The Influence of Bolt Tension and Economical Tensile Loads on the Behavior of a Bolted Joint.” Proc. SESA VIII 1 29
- Dolan T. J. “Load Relations in Bolted Joints.” Mechanical Engineering 64 607
- Radzimovsky E. I. “Bolt Design for Repeated Loading Machine Design.” 24 11 135
- Roberts I. “Gaskets and Bolted Joints.” ASME Journal, App. Mech 72 169
- Brookhard G. C. Jr Siddiqi I. H. Vasarhelzi D. D. “The Effect of Galvanizing and of Other Surface Treatments on High Tensile Bolts and Bolted Joints.” University of Washington. Available from Clearinghouse for Federal Scientific and Technical Information, PB 174238, September 1966
- Blake J. C. Kurtz H. J. “The Uncertainties of Measuring Fastener Preload.” Machine Design 37 23 Sept. 30 1965 128 133
- Eshbach O. W. “Handbook of Engineering Fundamentals.” New York John Wiley and Sons, Inc. 1952 4 51
- Heywood R. B. “Designing Against Fatigue of Metals.” New York Reinhold Publishing Corp. 1962
- Cazaud R. Fenner A. J. “Fatigue of Metals.” New York Philosophical Library 1953
- Appleberry W. T. “How Fastener Tension varieswith External Joint Loads.” Assembly and Fastener Engineering 4 4, 5, and 6 April 1961 May 1961 June 1961 26 30 29 33 32 36
- Maney G. A. “Predicting Bolt Tension.” Fasteners 3 5 1947
- Little R. E. “Bolted Joints: How Much Give?” Machine Design 39 26 Nov. 9 1967 173 175
- Stewart W. C. “Properties of Preloaded Steel Bolts.” Product Engineering 24 11 November 1953 191 195
- McClure J. G. “The Prestressed Bolt.” Machine Design 32 19 Sept. 15 1960 173 174