WAC 296-52-69115. Table H-22—Separation distances of ammonium nitrate and blasting agents from explosives or blasting agents

Table H-22 table of separation distances of ammonium nitrate and blasting agents from explosives or blasting agents 1 Donor weight Minimum separation distance of receptor when barricaded 2 (ft.) Minimum thickness of artificial barricades 5 (in.) Pounds over Pounds not over Ammonium nitrate 3 Blasting agent 4 100 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 Donor weight Minimum separation distance of receptor when barricaded 2 (ft.) Minimum thickness of artificial barricades 5 (in.) Pounds over Pounds not over Ammonium nitrate 3 Blasting agent 4 100 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 Note 1: These distances apply to the separation of storage. Table H-20 must 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 must be multiplied by six. 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." When ammonium nitrate is stored in a bullet resistant magazine it is recommended explosives or where the storage is protected by a bullet resistant wall, distances, and barricade thickness in excess of those prescribed in Table H-20 are not required. Note 3: The distances in the table apply to ammonium nitrate that passes the insensitivity test prescribed in the definition of ammonium nitrate fertilizer promulgated by the Fertilizer Institute, and ammonium nitrate failing to pass a test must be stored at separation distances determined by competent persons. (Definition and Test Procedures for Ammonium Nitrate Fertilizer, the Fertilizer Institute, formerly the National Plant Food Institute, November 1964.) Note 4: These distances apply to nitro-carbo-nitrates and blasting agents, which pass the insensitivity test prescribed in the U.S. DOT regulations. Note 5: Acceptable barricades include either natural or artificial barricades as defined in WAC 296-52-60130 , Definitions. 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 because its blast effect is lower. Note 7: Guide to use of table of recommended separation distances of ammonium nitrate and blasting agents from explosives or blasting agents. (a) Sketch the location of all potential donors and acceptor materials together with the maximum amount of material to be allowed in the area. (Potential donors are high explosives, blasting agents, and combination of masses of detonating materials. Potential acceptors are high explosives, blasting agents, and ammonium nitrate.) (b) Consider each donor mass in combination with each acceptor mass. If the masses are closer than table allowance, distances measured between nearest edges, the combination of masses becomes a new potential donor of weight equal to the total mass. When individual masses are considered as donors, distances to potential acceptors must be measured between edges. When combined masses within propagating distance of each other are considered as a donor, the appropriate distance to the edge of potential acceptors must be computed as a weighted distance from the combined masses: (i) Calculation of weighted distance from combined masses: Let M 2 , M 3 ... Mn be donor masses to be combined. M 1 is a potential acceptor mass. D 12 is distance from M 1 to M 2 (edge to edge). D 13 is distance from M 1 to M 3 (edge to edge), etc. To find weighted distance D 1(2,3... n) from combined masses to M 1 , add the products of the individual masses and distances and divide the total by the sum of the masses: D 1(2,3…n) = M 2 x D 12 + M 3 xD 13 + M n x D in M 2 + M 3 + M n D 1(2,3…n) = M 2 x D 12 + M 3 xD 13 + M n x D in M 2 + M 3 + M n Propagation is possible if either an individual donor mass is less than the tabulated distance from an acceptor or a combined mass is less than the weighted distance from an acceptor. (c) When determining the distances separating highways, railroads, and inhabited buildings from potential explosions (as prescribed in Table H-20), the sum of all masses which may propagate (i.e., lie at distances less than prescribed in the table) from either individual or combined donor masses are included. However, the ammonium nitrate must be included, only 50 percent of its weight must be used because of its reduced blast effects. In applying Table H-21, distances from highways, railroads, and inhabited buildings, distances are measured from the nearest edge of potentially explodable material. (d) When all or part of a potential acceptor comprises explosives Class A as defined in U.S. DOT regulations, storage in bullet resistant magazines is required. Safe distances to stores in bullet resistant magazines may be obtained from the intermagazine distances described in Table H-21. (e) Barricades cannot have line of sight openings between potential donors and acceptors, which permit blast or missiles to move directly between masses. (f) Good housekeeping practices must be maintained around any bin containing ammonium nitrate or blasting agent. This includes keeping weeds and other combustible materials cleared within twenty-five feet of the bin. Accumulation of spilled product on the ground must be prevented.