This paper investigates the behavior of horizontal cylindrical vessels, subjected to thermal loading by high-temperature fluid, where the saddles are fixed to the supporting structure. In order to determine an optimum saddle design, three widely used saddle configurations, with differing saddle heights and top saddle plate extensions, are explored. Thereafter, one of the saddle designs is selected to illustrate a decoupling procedure, for the radial and axial expansions, whereby design charts are obtained to derive the maximum stress values for a range of vessel geometries. The finite element approach, using linear elastic, small displacement analysis, is used throughout.

BS 5276, 1983, “Pressure Vessel Details (Dimensions), Part 2. Specification for Saddle Supports for Horizontal Cylindrical Pressure Vessels.”
Cheung, J. S. T., Tooth, A. S., Nadarajah, C., Ong, L. S., and Ng, H. W., 1995, “Horizontal Pressure Vessels on Fixed Saddle Supports Under Thermal Expansion Loading—A Study of Three Different Saddle Designs,” Proceedings, International Conference on Mechanics of Solids and Material Engineering, Vol. C, Singapore, June 5–7, pp. 1004–1009.
Megyesy, E. F., 1995, Pressure Vessel Handbook, 10th Edition, Tulsa, Inc., OK.
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