The initiation of in-plane squirm in expansion joint bellows
- UOP, Des Plaines, IL (United States)
A universal-type expansion joint in an operating fluid catalytic cracking (FCC) unit failed because of squirm during a short-term overpressure event. The expansion joint bellows element was supplied in the annealed condition for metallurgical reasons. Although the EJMA Standards have since revised the design requirements for squirm, limited guidance was available at the time, particularly for annealed bellows. To evaluate the expansion joint failure, an equation to predict the initiation of in-plane squirm had to be developed. The approach used was to develop a simplified equation for the formation of a plastic hinge in the bellows element, including the biaxial stress state. This paper presents that analysis and a comparison of the developed equation with test data on bellows.
- OSTI ID:
- 124713
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1332-0
- Country of Publication:
- United States
- Language:
- English
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