These distances allow for the possibility of high velocity metal fragments from mixers, hoppers, truck bodies, sheet metal structures, metal container, and the like which may enclose the “donor”. Table H-21 shall be used in determining separation distances from inhabited buildings, passenger railways, and public highways.Ģ When the ammonium nitrate and/or blasting agent is not barricaded, the distances shown in the table shall be multiplied by six. Minimum thickness of artificial barricades 5 (in.)ġ These distances apply to the separation of stores only. Minimum separation distance of receptor when barricaded 2 (ft.) It is not intended to apply to bombs, projectiles, or other heavily encased explosives. It is not applicable to transportation of explosives, or any handling or temporary storage necessary or incident thereto. If any two or more magazines are separated from each other by less than the specified “Separation of Magazines” distances, then such two or more magazines, as a group, must be considered as one magazine, and the total quantity of explosives stored in such group must be treated as if stored in a single magazine located on the site of any magazine of the group, and must comply with the minimum of distances specified from other magazines, inhabited buildings, railways, and highways.ĥ This table applies only to the permanent storage of commercial explosives. Department of Transportation as follows (see 49 CFR chapter I):ĭistances in feet when storage is barricaded: Separation of magazinesġ “Natural barricade” means natural features of the ground, such as hills, or timber of sufficient density that the surrounding exposures which require protection cannot be seen from the magazine when the trees are bare of leaves.Ģ “Artificial barricade” means an artificial mound or revetted wall of earth of a minimum thickness of three feet.ģ “Barricaded” means that a building containing explosives is effectually screened from a magazine, building, railway, or highway, either by a natural barricade, or by an artificial barricade of such height that a straight line from the top of any sidewall of the building containing explosives to the eave line of any magazine, or building, or to a point 12 feet above the center of a railway or highway, will pass through such intervening natural or artificial barricade.Ĥ When two or more storage magazines are located on the same property, each magazine must comply with the minimum distances specified from inhabited buildings, railways, and highways, and in addition, they should be separated from each other by not less than the distances shown for “Separation of Magazines,” except that the quantity of explosives contained in cap magazines shall govern in regard to the spacing of said cap magazines from magazines containing other explosives. Commercial explosives are those explosives which are intended to be used in commercial or industrial operations.Ĭlassification of explosives is described by the U.S. Department of Transportation, and includes, but is not limited to dynamite, black powder, pellet powders, initiating explosives, blasting caps, electric blasting caps, safety fuse, fuse lighters, fuse igniters, squibs, cordeau detonant fuse, instantaneous fuse, igniter cord, igniters, small arms ammunition, small arms ammunition primers, smokeless propellant, cartridges for propellant-actuated power devices, and cartridges for industrial guns. The term “explosives” shall include all material which is classified as Class A, Class B, and Class C explosives by the U.S. Department of Transportation see 49 CFR chapter I. Explosive - any chemical compound, mixture, or device, the primary or common purpose of which is to function by explosion, i.e., with substantially instantaneous release of gas and heat, unless such compound, mixture, or device is otherwise specifically classified by the U.S.
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