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|KA-III, phase C, M-1 propellant tests : deflagration in partial confinement
|Great Britain. Ministry of Defence. Safety Services Organisation.
Norwegian Defence Construction Service.
United States. Department of Defense. Explosives Safety Board.
Joachim, Charles E.
|Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
|Technical report (U.S. Army Engineer Waterways Experiment Station) ; SL-91-11.
Abstract: When a propellant material is stored under confined conditions, US and NATO explosives safety regulations require that the safety hazard quantity-distance (Q-D's) used for Hazard Class 1.1 (mass detonating) explosives be applied, rather than the less restrictive Q-D's normally used for propellants and other Class 1.3 materials. This is based on the assumption that high gas pressures produced by an accidental burning of propellant in a confined volume will cause the burning (deflagration) to transition to a detonation. To test this assumption, a series of experiments were conducted in which increasing amounts of propellants were ignited and burned inside a heavy concrete structure with an internal chamber volume of 5 m³. Pressure and temperatures were measured inside the chamber, in a connecting exhaust vent, and in the free field beyond the exhaust vent pipe. Although there was no evidence that a detonation occurred, the high gas pressures produced by burning of the largest propellent charge (250 kg) were sufficient to fail the structure.
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