The determination of the dynamic load factor (DLF) of pressure vessels in deflagration events is essential to bridging the gap between transient dynamic pressure load and static pressure load. The static pressure load is being used by industrial codes as the basic type of load for pressure vessel design. Employing the methodology previously developed by the authors, this paper presents an analytical solution for estimating the DLF of a simply-supported thin cylindrical pressure vessel in a deflagration event. The DLF is successfully simplified as a function of four key parameters: deflagration type (non-venting or venting), pressure rise time in the deflagration event, the frequency of the fundamental extensional mode of the shell circumference, and length to diameter ratio. The master curves of DLF versus length to diameter ratio are presented for both non-venting and venting deflagration events.

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