Discharge of non-reactive fluids from vessels

M. Castier, A. Basha, R. Kanes, Luc Vechot

Research output: Contribution to journalArticle

1 Citation (Scopus)


This paper presents simulations of discharges from pressure vessels that consistently account for non-ideal fluid behavior in all the required thermodynamic properties and individually considers all the chemical components present. The underlying assumption is that phase equilibrium occurs instantaneously inside the vessel and, thus, the dynamics of the fluid in the vessel comprises a sequence of equilibrium states. The formulation leads to a system of differential-algebraic equations in which the component mass balances and the energy balance are ordinary differential equations. The algebraic equations account for the phase equilibrium conditions inside the vessel and at the discharge point, and for sound speed calculations. The simulator allows detailed predictions of the condition inside the vessel and at the discharge point as a function of time, including the flow rate and composition of the discharge. The paper presents conceptual applications of the simulator to predict the effect of leaks from vessels containing mixtures of light gases and/or hydrocarbons and comparisons to experimental data.

Original languageEnglish
Pages (from-to)1149-1159
Number of pages11
JournalBrazilian Journal of Chemical Engineering
Issue number4
Publication statusPublished - 1 Oct 2017



  • Equation of state
  • Relief
  • Tank
  • Valve
  • Venting

ASJC Scopus subject areas

  • Chemical Engineering(all)

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