Peak Stress and Fatigue Assessment at the Saddle Support of a Cylindrical Vessel

[+] Author and Article Information
L. S. Ong

Nanyang Technological University, School of Mechanical and Production Engineering, Nanyang Avenue, Singapore 2263 Republic of Singapore

J. Pressure Vessel Technol 117(4), 305-311 (Nov 01, 1995) (7 pages) doi:10.1115/1.2842128 History: Received October 16, 1993; Revised January 24, 1995; Online February 11, 2008


The maximum stress in a saddle-supported cylindrical storage vessel is often the circumferential stress developed at the tips (or horns) of the saddle support. Although the peak stress at the support is not immediately detrimental to the integrity of a vessel, it would have a long-term effect on the fatigue life of the vessel. This article provides a parametric equation to determine the peak circumferential stress at the support. To assist calculations, a worksheet procedure has been proposed. The parametric equation is accompanied by four graphs, each graph provides values for a geometric variation of the problem. An example has been shown on the application of the parametric equation. A fatigue assessment is also made on the example vessel and comparison is made between ASME and British design codes. The parametric curves can be also used as a set of design curves for specifying support dimensions.

Copyright © 1995 by The American Society of Mechanical Engineers
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