Riser-Relief Valve Dynamic Interactions (Extension to a Previous Model)

[+] Author and Article Information
K. K. Botros

NOVA Research & Technology Corporation, 2928 16th Street N.E., Calgary, Alberta T2E 7K7, Canada

G. H. Dunn, J. A. Hrycyk

NOVA Gas Transmission Ltd., Calgary, Alberta, Canada

J. Pressure Vessel Technol 120(2), 207-212 (May 01, 1998) (6 pages) doi:10.1115/1.2842242 History: Received June 01, 1997; Revised November 21, 1997; Online February 11, 2008


Further investigation of the dynamic stability behavior of a typical pilot-operated relief valve is reported. The present study is an extension to Botros et al. (1997) model, which includes mapping of the oscillating frequencies and amplitudes with riser dimensionless length L/D ; inclusion of the effects of a wedge-O-ring seal in the model; detailed analyses of the field tests revealing unknown values for model parameters. These model refinements resulted in a better agreement between simulation results and field measurements. Analysis of piston oscillation frequencies and amplitudes indicates that the piston oscillation frequency mirrors the riser’s one-quarter-wave resonance frequency for lower values of L/D . At L/D = 20 and higher, two modes of oscillations started to emerge with two distinct frequencies. Maximum oscillation amplitudes occurred at L/D corresponding to one-quarter wave. Wedge-O-ring seal mechanism helps in suppressing piston oscillations; but it must be used in conjunction with a proper lubricant, otherwise the piston may jam partway during the upward stroke.

Copyright © 1998 by The American Society of Mechanical Engineers
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