Connecticut Administrative Code › Title 29 - Public Safety and State Police › 349 - Storage, Transportation and Use of Explosives and Blasting Agents › Chapter IX - STORAGE OF AMMONIUM NITRATE › Section 29-349-340 - Sprinklers, hydrants may be waived

Current through July 10, 2024
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.