Blast Protection Damper
AssigneeWozair Limited
InventorMudalige Anoj Menushka Mario Perera
Life of this patent
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Abstract
A blast wave damper comprises a section of duct, with a multiplicity of rigid elements each extending across the duct. All the elements are parallel to each other, and they are arranged in an array consisting of a multiplicity of lines, each such line extending across the duct. The elements in one line are staggered relative to the elements in an adjacent line, and the gaps between successive elements within a line are no wider than the widths of the elements. There may be ten columns of tubular elements in a regular array. This may be combined with a louver mechanism arranged to shut if the pressure drop exceeds a threshold.
Claims18
A blast protection damper consisting only of a section of duct, with a multiplicity of substantially rigid elements of steel, titanium, or titanium alloy, each extending across the duct and being fixed at each end, the elements being of cylindrical shape and so providing only cylindrical surfaces to scatter blast-waves, the elements not comprising sound absorbing or attenuating material, and not being tubular, and so not being arranged for through-flow of any fluid, the elements all extending parallel to each other and being arranged in an array consisting of a multiplicity of lines of said elements, each such line extending across the duct, the elements in each such line being staggered relative to the elements in each adjacent line, and each gap between successive elements within each such line being no wider than the width of each element, such that, in the event of a blast wave in the duct, the damper restricts the overpressure downstream of the damper.
A blast protection damper comprising a damper consisting only of a section of duct arranged to carry an air flow for cooling or ventilation, with a multiplicity of substantially rigid elements of steel, titanium or titanium alloy, each extending across the duct and being fixed at each end, the elements being of cylindrical shape and so providing only cylindrical surfaces to scatter blast-waves, the elements not comprising sound absorbing or attenuating material, and not being arranged for through-flow of any fluid, the elements all extending parallel to each other and being arranged in an array consisting of a multiplicity of lines of said elements, each such line extending across the duct, the elements in each such line being staggered relative to the elements in each adjacent line, and each gap between successive elements within each such line being no wider than the width of each element, such that, in the event of a blast wave in the duct, the damper restricts the overpressure downstream of the damper and also comprising a louver which is arranged to shut if the pressure in the duct exceeds a threshold.
A method for providing a flow of air for cooling or ventilation along an air flow duct, where there is a risk that ignition of a flammable mixture may cause propagation of a blast wave along the air flow duct, which method comprises:
- (A) installing in the air flow duct a blast protection damper consisting of a section of the air flow duct, with a multiplicity of substantially rigid elements of steel, titanium or titanium alloy, each extending across the duct section and being fixed at each end, the elements being of cylindrical shape and so providing only cylindrical surfaces to scatter blast-waves, the elements not comprising sound absorbing or attenuating material, and not being arranged for through-flow of any fluid, the elements all extending parallel to each other and being arranged in an array consisting of a multiplicity of lines of said elements, each such line extending across the duct section, the elements in each such line being staggered relative to the elements in each adjacent line, and each gap between successive elements within each such line being no wider than the width of each element;
- and
- (B) causing air for cooling or for ventilation to flow along the air flow duct;
- and
- whereby, in the event of a blast wave in the air flow duct, the damper restricts the overpressure downstream of the damper.
Dependencies are inferred from the claim text.