Pressure vessel burst (PVB) explosions are credible explosion hazards at a number of chemical processing and petroleum refining facilities. PVBs can present both blast and fragment hazards. Blast prediction methods specific to spherical PVBs were first developed in the 1970s and revised blast curves were subsequently published. The directional effects from non-spherical PVBs were recently investigated by the authors, resulting in correlations for blast overpressure and impulse for a range of vessel geometries and burst conditions. The existing blast charts coupled with these correlations provide a well-defined blast prediction method for PVBs. When a PVB blast wave propagates through an enclosure opening (e.g., window or door), the result is an infiltrated blast wave which will propagate downstream into the enclosure. This paper addresses the infiltration of a PVB blast wave through an opening on a wall. The properties of an infiltrated blast wave depend primarily on the incident blast wave peak pressure, positive phase duration and the opening size. The purpose of the work described in this paper is to introduce an equivalent explosion source, characterized by these three parameters, so that the infiltrated PVB blast loads can be evaluated based on the equivalent source and existing blast curves.

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