Even if the volume of the system is not fixed......structural failure may still result. Explosions can occur even if the initial flammable volume is completely unconfined. ...... the degree of confinement is not entirely determined by geometric boundary constrains ...As combustion wave velocities approach the speed of sound ... expanding gas motions become too slow to provide for pressure relief, and the system becomes confined by its own dynamic state ...引自第6页
The KSt values reach their maxima at concentrations that correspond to the burning of near stoichiometric concentrations of volatiles ..... it is expected that a limiting rich concentration will be reached but only at extraordinarily high concentrations of several thousand grams per cubic metre (of which) the dispersion ... becomes improbable.引自第16页
A dust may be ascribed a dust hazard class of St number depending on its Kst value ... Kst values or St numbers can then be applied to an appropriate nomograph to determine the vent size for a specific vessel handling a given dust.引自第70页