Conference Paper

SMALL SCALE EXPERIMENTS ON BOILING LIQUID EXPANDING VAPOR EXPLOSIONS: SUPERCRITICAL BLEVE

DOI: 10.1115/PVP2012-78283 Conference: PVP 2012

ABSTRACT The most dangerous accident that can occur in LPG stor-age is the boiling liquid expanding vapor explosion (BLEVE). To better understand the rupture of the reservoir and the blast wave characteristics, small scale BLEVE experiments are performed with cylinders of 95 ml, filled at 86% with propane, laid hori-zontally and heated from below. A weakening of the reservoirs on the upper part allows better reproducibility of the rupture. High speed visualization, blast overpressure and surface reser-voir temperature are measured. Internal pressure measurement shows that the rupture pressure and temperature are well above the critical point. The fluid is then supercritical and there is no distinction anymore between liquid and gas prior rupture. This kind of reservoir rupture is significant of a new type of BLEVE, a supercritical BLEVE. The experiments also show that the fluid behavior during rupture differs with the size of the weakened part and therefore with the rupture pressure. Finally, the measured peak overpressures are compared with literature models. C p Specific heat [kJ/kgK] c Reservoir groove length [m] L Distance from source [m] L r Width of reservoir opening [m] E Expansion energy [kJ] m Total fluid mass [kg] n Fit parameters in Sadek equation [2] P Pressure [bar] r Cloud or Blast wave radius from reservoir [m] s Entropy [kJ/kg] T Temperature [K] t time [s] U Expanding velocity [m/s] u Internal energy [kJ/kg] v Specific volume [m 3 /kg] V Volume [m 3 ] GREEK SYMBOLS α Fit parameters in Sadek equation [2] β Constant in Genova model [3] γ Specific heat ratio of vapor [-] ∆t Time interval between 2 images [ms]

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