Sprinklers, hydrants may be waived

The requirements for automatic sprinklers, water supplies and fire hydrants set forth in this Code may be waived by the State Fire Marshal when storage facilities are located in remote areas. Table of Recommended Separation Distances of Ammonium Nitrate and Blasting Agents from Explosives or Blasting Agents (Notes 1, 6)** 1 Minimum Separation Distance of Receptor When Barricaded Minimum Thickness of Artificial Barricades Donor Weight (Note 2) (Feet) (Note 5) (Inches) Pounds over Pounds not over Ammonium Nitrate Blasting Agent 100 3 11 12 100 300 4 14 12 300 600 5 18 12 600 1,000 6 22 12 1,000 1,600 7 25 12 1,600 2,000 8 29 12 2,000 3,000 9 32 15 3,000 4,000 10 36 15 4,000 6,000 11 40 15 6,000 8,000 12 43 20 8,000 10,000 13 47 20 10,000 12,000 14 50 20 12,000 16,000 15 54 25 16,000 20,000 16 58 25 20,000 25,000 18 65 25 25,000 30,000 19 68 30 30,000 35,000 20 72 30 35,000 40,000 21 76 30 40,000 45,000 22 79 35 45,000 50,000 23 83 35 50,000 55,000 24 86 35 55,000 60,000 25 90 35 60,000 70,000 26 94 40 70,000 80,000 28 101 40 80,000 90,000 30 108 40 90,000 100,000 32 115 40 100,000 120,000 34 122 50 120,000 140,000 37 133 50 140,000 160,000 40 144 50 160,000 180,000 44 158 50 180,000 200,000 48 173 50 200,000 220,000 52 187 60 220,000 250,000 56 202 60 250,000 275,000 60 216 60 275,000 300,000 64 230 60 1 ** This Table appears in Recommended Separation Distances of Ammonium Nitrate and Blasting Agents from Explosives or Blasting Agents, adopted as an NFPA Tentative Standard (No. 492-T) in 1967. For a discussion of the derivation of the Table and examples of how it is applied to actual storage situations, see No. 492-T. NFPA 495 46 NOTE A46 New reference replaced reference to tentative recommendations in Information Circular 7988. New is as follows: "Safety Recommendation for Sensitized Ammonium Nitrate Blasting Agents," Bureau of Mines, U.S. Department of Interior, Information Circular 8179, 1963. NOTES TO TABLE OF RECOMMENDED SEPARATION AMMONIUM NITRATE AND BLASTING AGENTS FROM EXPLOSIVES OR BLASTING AGENTS Note 1 — Recommended separation distances to prevent explosion of ammonium nitrate and ammonium nitrate based blasting agents by propagation from nearby stores of high explosive or blasting agents referred to in the Table as the "donor." Ammonium nitrate, by itself, is not considered to be a donor when applying this Table. If stores of ammonium nitrate are located within the sympathetic detonation distance of explosives or blasting agents, one-half the mass of the ammonium nitrate should be included in the mass of the donor. These distances allow for the possibility of high velocity metal fragments from mixers, hoppers, truck bodies, sheet metal structures, metal containers, and the like, which may enclose the "donor." These distances apply to the separation of stores only. The American Table of Distances shall be used in determining separation distances from inhabited buildings, passenger railways, and public highways. Note 2 — When the ammonium nitrate and/or blasting agent is not barricaded, the distances shown in the Table shall be multiplied by six. Where storage is in bullet-resistant magazines recommended for explosives, or where the storage is protected by a bullet resistant wall, distances and barricade thickness in excess of those prescribed in the American Table of Distances are not required. Note 3 — The distances in the Table apply to ammonium nitrate that passes the insensitivity test prescribed in the National Plant Food Institute;** and ammonium nitrate failing to pass said test shall be stored at separation distances determined by competent persons and approved by the State Fire Marshal’s Office. Note 4 — These distances apply to nitro-carbo-nitrates and blasting agents which pass the insensitivity test prescribed in the DOT regulations. ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– * For construction of bullet-resistant magazines, see Chapter 3, NFPA 1967–68. ** Definition and Test Procedures of Ammonium Nitrate Fertilizer, National Plant Food Institute, November 1964. Note 5 — Earth or sand dikes or enclosures filled with the prescribed minimum thickness of earth or sand are acceptable artificial barricades. Natural barricades, such as hills or timber of sufficient density that the surroundings exposures which require protection cannot be seen from the "donor" when the trees are bare of leaves, are also acceptable. Note 6 — When the ammonium nitrate must be counted in determining the distances to be maintained from inhabited buildings, passenger railways and public highways, it may be counted at one-half its actual weight.