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Subchapter 7. General Industry Safety Orders
Group 18. Explosives and Pyrotechnics
Article 114. Storage of Explosives

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§5252. Quantity and Distances Table for the Storage of Explosives.



(a) The quantity of explosive materials that may be kept or stored in any magazine shall conform to Table EX-1, Table of Distances, which sets forth the minimum distance that a magazine may be located from the nearest inhabited building or other magazine.

(b) The quantity and distance table is not applicable to any magazine if the nearest inhabited building is effectually screened from the magazine by a natural barrier, which:

(1) Is 40 feet or more in height at any point, above a straight line drawn from the top of any sidewall of the magazine to any part of the inhabited building; and

(2) Has a natural thickness of not less than 200 feet at the point where it is intersected by the straight line.

(c) All types of blasting caps in strength through No. 8 shall be rated at 1 1/2 pounds of explosives per 1,000 caps. For strengths higher than No. 8 cap, consult the manufacturer.

(d) For quantity and distance purposes detonating cord up to 60 grains per foot shall be calculated as equivalent to 9 pounds of high explosives per 1,000 feet. Heavier detonating cord shall be rated proportion- ately.

(e) 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 shall be separated from each other by not less than the distances shown for “Separation of Magazines,” except that the quantity of explosive materials contained in cap magazines shall govern in regard to the spacing of said cap magazines from magazines containing other explosive materials. 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 explosive materials stored in such group must be treated as if stored in a single magazine located on the side of any magazine of the group, and must comply with the minimum of distances specified from other magazines and inhabited buildings.

 

TABLE EX-1-AMERICAN TABLE OF DISTANCES FOR STORAGE OF EXPLOSIVES
As revised and approved by the Institute of Makers of
Explosives, November 5, 1971
QUANTITY OF EXPLOSIVES Inhabited Buildings Public Highways
Class A to D
Passenger Railways-
Public Highways with Traffic Volume of more than 3000 Vehiles/Day
Separations of
Magazines
Pounds
Over
Pounds
Not Over
Barricaded Unbarricared Barricaded Unbarricared Barricaded Unbarricared Barricaded Unbarricared
2
5
10
20
30
5
10
20
30
40
70
90
110
125
140
140
180
220
250
280
30
35
45
50
55
60
70
90
100
110
51
64
81
93
103
102
128
162
186
206
6
8
10
11
12
12
16
20
22
24
40
50
75
100
125
50
75
100
125
150
150
170
190
200
215
300
340
380
400
430
60
70
75
80
85
120
140
150
160
170
110
127
139
150
159
220
254
278
300
318
14
15
16
18
19
28
20
32
36
38
150
200
250
300
400
200
250
300
400
500
235
255
270
295
320
470
510
540
590
640
95
105
110
120
130
190
210
230
240
260
175
189
201
221
238
350
378
402
442
476
21
232
24
27
29
42
45
48
54
58
500
600
700
800
900
600
400
800
900
1000
340
355
375
390
400
680
710
730
780
800
135
145
150
155
160
270
290
300
310
320
253
266
278
289
300
506
532
556
578
600
31
32
33
35
36
62
64
66
70
72
100
1200
1400
1600
1800
1200
1400
1600
1800
2000
425
450
470
490
505
850
900
940
980
1010
165
170
175
180
85
330
340
350
360
370
318
336
351
366
378
636
672
702
732
756
39
41
43
44
45
78
82
86
88
90
2000
2500
3000
4000
5000
2500
3000
4000
5000
6000
545
580
638
685
730
1090
1160
1270
1370
1480
190
195
210
225
235
380
390
420
450
470
408
432
474
513
546
816
864
948
1025
1092
19
52
58
61
65
98
104
116
122
130
6000
7000
8000
9000
10000
7000
8000
9000
10000
12000
770
800
835
865
875
1540
1600
1670
1730
1750
245
250
255
260
270
490
500
510
530
540
573
600
624
645
687
1145
1200
1248
1290
1374
68
72
75
78
82
136
144
150
156
164
12000
14000
16000
18000
20000
14000
16000
18000
20000
25000
885
900
940
975
1055
1770
1800
1880
1950
2000
275
280
285
290
315
550
560
570
580
630
723
756
786
813
876
1445
1512
1572
1625
1752
87
90
94
98
105
174
180
186
196
210
25000
30000
35000
40000
45000
30000
35000
40000
45000
50000
1130
1205
1275
1340
1400
2000
2000
2000
2000
2000
340
360
380
400
420
680
720
760
800
840
933
981
1025
1058
1104
1886
1982
2000
2000
2000
112
119
124
129
135
224
238
248
258
270
50000
55000
60000
65000
70000
55000
60000
65000
70000
75000
1460
1515
1565
1610
1655
2000
2000
2000
2000
2000
440
455
470
485
500
880
910
940
970
1000
1140
1173
1206
1236
1263
2000
2000
2000
2000
2000
140
145
150
155
160
280
290
300
310
320
75000
80000
85000
90000
95000
80000
85000
90000
95000
100000
1695
1730
1760
1790
1815
2000
2000
2000
2000
2000
510
520
530
540
545
1020
1040
1060
1080
1090
1293
1317
1344
1368
1392
2000
2000
2000
2000
2000
165
170
175
180
185
330
340
350
360
370
100000
110000
120000
130000
140000
110000
120000
130000
140000
150000
1835
1855
1875
1890
1900
2000
2000
2000
2000
2000
550
555
560
565
570
1100
1110
1120
1130
1140
1437
1479
1521
1557
1593
2000
2000
2000
2000
2000
195
205
215
225
235
390
410
430
450
470
150000
160000
170000
180000
190000
160000
170000
180000
190000
200000
1935
1965
1990
2010
2030
2000
2000
2000
2010
2030
580
590
600
605
610
1160
1180
1200
1210
1220
1629
1662
1695
1725
1755
2000
2000
2000
2000
2000
245
255
265
275
285
490
510
530
550
570
200000
210000
230000
250000
275000
210000
230000
250000
275000
300000
2055
2100
2155
2215
2275
2055
2100
2155
2215
2275
620
635
650
670
690
1240
1270
1300
1340
1380
1782
1836
1890
1950
2000
2000
2000
2000
2000
2000
295
315
335
360
385
590
630
670
720
770

NOTES:


(1) Separation distances to prevent explosion of ammonium nitrate and ammonium nitrate-based blasting agents by propagation from nearby stores of high explosives 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. Ammonium nitrate, ammonium nitrate-fuel oil or combinations thereof are acceptors. If stores of ammonium nitrate are located within the sympathetic detonation distances of explosives or blasting agents, one-half the mass of the ammonium nitrate should be included in the mass of the donor.


(2) 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 said test shall be stored at separation distances determined by competent persons.


TABLE EX-3

Types of Storage Facilities


View Graphic

*As a result of tests with electric blasting caps, it has been determined that these blasting caps are not subject to sympathetic detonation. Therefore, a Type 4 storage facility meets the necessary requirements for storage of blasting caps that do not mass detonate.

NOTE

Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 12006, Health and Safety Code.

HISTORY

1. Repealer and new section filed 10-17-75; effective thirtieth day thereafter (Register 75, No. 42).

2. Amendments filed 7-16-76; effective thirtieth day thereafter (Register 76, No. 29).

3. Amendment filed 9-18-80; effective thirtieth day thereafter (Register 80, No. 38).

4. Amendment of section heading, section and Note, including transfer of section 1938, App B, Plate B-14, table 1 to replace former Table EX-1; transfer of section 5253 Table EX-2 to new section 5252 Table EX-2; and transfer of section 1938, App B, Plate B-14a to new Table EX-3, filed 7-11-2003; operative 8-10-2003 (Register 2003, No. 28).

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