Accidental releases of two-phase multicomponent critical flow from horizontal pipes

Authors

  • Paola Verlicchi,

    1. CNR-GNDRCIE, DICMA, Viale Risorgimento 2, 40136 Bologna, Italy
    2. Università di Bologna, Department of Chemical and Mining Engineering and Environmental Technologies, Viale Risorgimento 2, I-40136, Bologna, Italy
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  • Paolo Leonelli,

    1. Università di Bologna, Department of Chemical and Mining Engineering and Environmental Technologies, Viale Risorgimento 2, I-40136, Bologna, Italy
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  • Gigliola Spadoni

    1. Università di Bologna, Department of Chemical and Mining Engineering and Environmental Technologies, Viale Risorgimento 2, I-40136, Bologna, Italy
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Abstract

An accident involving a two-phase release can result in serious consequences for people as well as the environment. Consequently, tools are needed to give accurate predictions of the discharge rate, physical state, composition of released material, and chocked pressure in order to improve process safety efficiency.

This paper discusses possible approaches to the examination of two-phase critical releases and presents a slip equilibrium model which provides critical flow rate, critical pressure, and phase fraction of the two phases emerging from an accidentally broken pipe containing a liquefied gas mixture under pressure.

Comparisons between experimental critical flow rates and model predictions are favorable in both monocomponent and multicomponent mixtures.

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