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3304.1.1 Calculation of Quantity of Explosives
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The quantity of explosives stored at any location and the distance from such storage to protected exposures shall be in accordance with the quantity-distance tables in FC3304.5. The net explosive weight of the explosives shall be determined in accordance with FC 3304.1.1.1 through 3304.1.1.6.
For Division 1.1, 1.2 or 1.5 explosives, the total net explosive weight of all such explosives, or the TNT equivalent, shall be used for purposes of quantity-distance requirements in accordance with FC Table 3304.5.2(2).
- For Division 1.3 propellants, the total weight of the propellants alone shall be the net explosive weight for purposes of quantity-distance requirements in accordance with FC Table 3304.5.2(3).
- The sum of the net weights of metal powders and pyrotechnic materials shall be the net explosive weight for purposes of quantity-distance requirements in accordance with FC Table 3304.5.2(3).
- When Division 1.1 and 1.2 explosives are located in the same site, determine the distance for the total quantity considered first as if the total quantity were in Division 1.1 and then as if the total quantity were in Division 1.2. The required distance is the greater of the two. When the Division 1.1 requirements are controlling and the TNT equivalent of the Division 1.2 explosive is known, the TNT equivalent weight of the Division 1.2 explosives shall be added to the total explosive weight of Division 1.1 explosives to determine the net explosive weight for the Division 1.1 distance determination, for purposes of quantity-distance requirements in accordance with FC Table 3304.5.2(2).
- When Division 1.1 and 1.3 explosives are located in the same site, determine the distances for the total quantity considered first as if the total quantity were in Division 1.1 and then as if the total quantity were in Division 1.3. The required distance is the greater of the two. When the Division 1.1 requirements are controlling and the TNT equivalent of the Division 1.3 explosives is known, the TNT equivalent weight of the Division 1.3 explosives shall be added to the total explosive weight of Division 1.1 explosives to determine the net explosive weight for the Division 1.1 distance determination, for purposes of quantity-distance requirements in accordance with FC Table 3304.5.2(2) or 3304.5.2(3), as appropriate.
- When Division 1.1, 1.2 and 1.3 explosives are located in the same site, determine the distances for the total quantity considered first as if the total quantity were in Division 1.1, next as if the total quantity were in Division 1.2 and finally as if the total quantity were in Division 1.3. The required distance is the greatest of the three. When the Division 1.1 requirements are controlling and the TNT equivalent of the Division 1.2 and Division 1.3 explosives are known, the TNT equivalent weight of the Division 1.2 and Division 1.3 explosives shall be added to the total explosive weight of Division 1.1 explosives to determine the net explosive weight for the Division 1.1 distance determination, for purposes of quantity-distance requirements in accordance with FC Table 3304.5.2(2).
- For any composite pyrotechnic material and Division 1.1 or Division 1.3 explosives, the sum of the net weights of the pyrotechnic material and the explosives shall be used for the distance determination, for purposes of quantity-distance requirements in accordance with FC Tables 3304.5.2(2) and 3304.5.2(3).
For Division 1.4 explosives, the total weight of the explosive alone is the net weight for the distance determination, for purposes of quantity-distance requirements in accordance with FC Table 3304.5.2(4).
Detonating cord of 50 grains per foot shall be calculated as equivalent to 8 pounds (4 kg) of high explosives per 1,000 feet (304 800 mm), for purposes of quantity-distance requirements. Heavier or lighter core loads shall be rated proportionally.
All types of detonators in strengths through No. 8 cap shall be rated at 11/2 pounds (0.68 kg) of explosives per 1,000 caps, for purposes of quantity-distance requirements. Detonators in strengths higher than No. 8 cap shall be rated as prescribed by the manufacturer.
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