The Fall 2021 newsletter presents the white paper, Analysis of PRV Stability In Relief Systems Part II – Screening. In part I of this paper we established a detailed dynamics methodology for the modeling of PRV stability. We demonstrated that (a) the irrecoverable inlet pressure loss due to friction has essentially no impact on PRV stability (also see [3]), (b) PRV instability is caused by the coupling of PRV disk motion with the pressure wave caused by excessive acoustic pressure drop (1/4 wave) during PRV opening/closing, (c) the instability does not amplify, and (d) liquid systems are the most likely to cause damage to piping and piping components. In this paper we provide a simplified model for the assessment of PRV stability where the inlet line geometry is simple and/or where the inlet line acoustic length can be established. This simplified model has also been proposed in the 3rd ballot of API-520 part II. Download this newsletter for access to more tools and resources on the subject of PRV stability. Watch the highlights of the webinar, Bridging the 3% Inlet Pressure Loss Rule Gap. Read an update from the U.S. Chemical Safety and Hazard Investigation Board on the November 2019 incident which occurred at the TPC Group PNO facility in Port Neches, TX. Stay informed on the latest training offerings from ioMosaic.
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