Performance of low pressure explosion vents

Abstract

The internal pressure developed during deflagrations in low‐pressure structures depends on the dynamic performance of the explosion vents used for protection. Large scale tests were performed to evaluate the effectiveness of different types of commercially available vents.

Study of Gas Combustion in a Vented Cylindrical Vessel

“…The most advanced venting design methods so far applied in safety engineering are those based on so-called heat balance models (Canu et al, 1991;Eckhoff, 1991;Nagy and Verakis, 1983;Swift and Epstein, 1987). In these methods, pressure variation and venting flow are inferred from calculation of heat, mass, and momentum balances between burned and unburned regions (Canu et al, 1991;Cooper et al, 1986;McCann et al, 1985).…”

Uncertainty of the Estimates of Explosion Hazard on the Example of Textile Manufactures

“…The data cited in [28] and [30 through 45] are mostly for aliphatic gases. It is believed that liquid mists can be treated in the same manner as aliphatic gases, provided the fundamental burning velocity of the vapor is less than 1.3 times that of propane.…”

Venting Of Deflagrations In Buildings And Equipment : Universal Correlation

“…discharge parameter for subsonic and sonic regime is equal respectively pa I+y Y-1 and condition for sonic discharge x 2 -Pi( 2 ) Dimensionless density for unburnt and burnt gases are equal respectively ou = 7c1'~' and It is easy to see that for the same values of El, yu, yb, ratios pa /Pi and p, /pi, and assumptions abcut discharge model (A) the theoretical dimensionless pressure-time history and hence dimensionless maximum explosion overpressure will depend only from the turbulent venting parameter W t . Whereas the value of Wr depends on the only unknown a priori ratio x /p, the dimensionless time .s depends on the unknown turbulence factor x only.…”

“…Practically all explosions start and develop as deflagrations and only a little part of them transit to detonation mode. Deflagration venting is a more convenient, cost-effective technique in comparison with others: inerting, suppression and containment [2].…”