Riser-relief valve dynamic interactions (extension to a previous model)
- NOVA Research and Technology Corp., Calgary, Alberta (Canada)
- NOVA Gas Transmission Ltd., Calgary, Alberta (Canada)
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.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 619453
- Journal Information:
- Journal of Pressure Vessel Technology, Vol. 120, Issue 2; Other Information: DN: Paper presented at the pressure vessels and piping conference, July 27--31, 1997, Orlando, FL (US); PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
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