Subpart K (continued) - Table of distances

55.218 Table of distances for storage of explosive materials.
55.219 Table of distances for storage of low explosives.
55.220 Table of separation distances of ammonium nitrate and blasting agents from explosives or blasting agents.
55.221 Requirements for special fireworks, pyrotechnic compositions, and explosive materials used in assembling fireworks.
55.222 Table of distances between fireworks process buildings and between fireworks process and fireworks nonprocess buildings.
55.223 Table of distances between fireworks process buildings and other specified areas.
55.224 Table of distances for the storage of special fireworks (except bulk salutes).

Quantity of Explosives		Distances (in Feet)
Pounds		Inhabited Buildings		Public Highways Class A to D		Passenger railways - public highways with traffic volume of more than 3,000 vehicles per day		Separation of magazines
over	not over	Barricaded	Unbarricaded	Barricaded	Unbarricaded	Barricaded	Unbarricaded	Barricaded	Unbarricaded
2	5	70	140	30	60	51	102	6	12
5	10	90	180	35	70	64	128	8	16
10	20	110	220	45	90	81	162	10	20
20	30	125	250	50	100	93	186	11	22
30	40	140	280	55	110	103	206	12	24
40	50	150	300	60	120	110	220	14	28
50	75	170	340	70	140	127	254	15	30
75	100	190	380	75	150	139	278	16	32
100	125	200	400	80	160	150	300	18	36
125	150	215	430	85	170	159	318	19	38
150	200	235	470	95	190	175	350	21	42
200	250	255	510	105	210	189	378	23	46
250	300	270	540	110	220	201	402	24	48
300	400	295	590	120	240	221	442	27	54
400	500	320	640	130	260	238	476	29	58
500	600	340	680	135	270	253	506	31	62
600	700	355	710	145	290	266	532	32	64
700	800	375	750	150	300	278	556	33	66
800	900	390	780	155	310	289	578	35	70
900	1,000	400	800	160	320	300	600	36	72
1,000	1,200	425	850	165	330	318	636	39	78
1,200	1,400	450	900	170	340	336	672	41	82
1,400	1,600	470	940	175	350	351	702	43	86
1,600	1,800	490	980	180	360	366	732	44	88
1,800	2,000	505	1,000	185	370	380	760	48	90
2,000	2,500	550	1,090	190	380	408	816	49	98
2,500	3,000	580	1,160	195	390	432	864	52	104
3,000	4,000	635	1,270	210	420	474	948	58	116
4,000	5,000	685	1,370	225	450	513	1,026	61	122
5,000	6,000	730	1,460	235	470	546	1,092	65	130
6,000	7,000	770	1,540	245	490	573	1,146	68	136
7,000	8,000	800	1,600	250	500	600	1,200	72	144
8,000	9,000	835	1,670	255	510	624	1,248	75	150
9,000	10,00	865	1,730	260	520	645	1,290	78	156
10,000	12,000	875	1,750	270	540	687	1,374	82	164
12,000	14,000	885	1,770	275	550	723	1,446	87	174
14,000	16,000	900	1,800	280	560	756	1,512	90	180
16,000	18,000	940	1,880	285	570	786	1,572	94	188
18,000	20,000	975	1,950	290	580	813	1,626	98	196
20,000	25,000	1,055	2,000	315	630	876	1,752	105	210

TABLE: AMERICAN TABLE OF DISTANCES FOR STORAGE OF EXPLOSIVES (DECEMBER 1910), AS REVISED AND APPROVED BY THE INSTITUTE OF MAKERS OF EXPLOSIVES-NOVEMBER 5,1971.

Notes to the Table of Distances for Storage of Explosives, above

(1) Terms found in the table of distances for storage of explosive materials are defined in § 55.11.

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

(3) All types of blasting caps in strengths through No. 8 cap should be rated at 1-1/2 lbs. of explosives per 1,000 caps. For strengths higher than No. 8 cap, consult the manufacturer.

(4) For quantity and distance purposes, detonating cord of 50 or 60 grains per foot should be calculated as equivalent to 9 lbs. of high explosives per 1,000 feet. Heavier or lighter core loads should be rated proportionately.

Pounds		From inhabited building distance (feet)	From public railroad and highway distance (feet)	From above ground magazine (feet)
Over	Not Over
0	1,000	75	75	50
1,000	5,000	115	115	75
5,000	10,000	150	150	100
10,000	20,000	190	190	125
20,000	30,000	215	215	145
30,000	40,000	235	235	155
40,000	50,000	250	250	165
50,000	60,000	260	260	175
60,000	70,000	270	270	185
70,000	80,000	280	280	190
80,000	90,000	295	295	195
90,000	10,0000	300	300	200
100,000	200,000	375	375	250
200,000	300,000	450	450	300

TABLE: DEPARTMENT OF DEFENSE AMMUNITION AND EXPLOSIVES STANDARDS, TABLE 5-4.1 EXTRACT; 4145.27 M, MARCH 1969.

Donor Weight (Pounds)		Minimum separation distance of acceptor from donor when barricaded (feet)		Minimum thickness of artificial barricades (inches)
Over	Not Over	Ammonium Nitrate	Blasting Agent
0	100	3	11	12
100	300	4	14	12
300	600	5	18	12
600	1000	6	22	12
1000	1600	7	25	12
1600	2000	8	29	12
2000	3000	9	32	15
3000	4000	10	36	15
4000	6000	11	40	15
6000	8000	12	43	20
8000	10000	13	47	20
10000	12000	14	50	20
12000	16000	15	54	25
16000	20000	16	58	25
20000	25000	18	65	25
25000	30000	19	68	30
30000	35000	20	72	30
35000	40000	21	76	30
40000	45000	22	79	35
45000	50000	23	83	35
50000	55000	24	86	35
55000	60000	25	90	35
60000	70000	26	94	40
70000	80000	28	101	40
80000	90000	30	108	40
90000	100000	32	115	40
100000	120000	34	122	50
120000	140000	37	133	50
140000	160000	40	144	50
160000	180000	44	158	50
180000	200000	48	173	50
200000	220000	52	187	60
220000	250000	56	202	60
250000	275000	60	216	60
275000	300000	64	230	60

TABLE: NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) OFFICIAL STANDARD NO. 492, 1968.

Notes to the Table of Separation Distances of Ammonium Nitrate and Blasting Agents From Explosives or Blasting Agents

(1) This table specifies 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 distance of explosives or blasting agents, one-half the mass of the ammonium nitrate is to be included in the mass of the donor.

(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." Where explosives storage is in bullet-resistant magazines or where the storage is protected by a bullet-resistant wall, distances and barricade thicknesses in excess of those prescribed in the table in § 55.218 are not required.

(3) These distances apply to ammonium nitrate that passes the insensitivity test prescribed in the definition of ammonium nitrate fertilizer issued by the Fertilizer Institute.' Ammonium nitrate failing to pass the test must be stored at separation distances in accordance with the table in § 55.218.

(4) These distances apply to blasting agents which pass the insensitivity test prescribed in regulations of the U.S. Department of Transportation (49 CFR Part 173).

Definition and Test Procedures for Ammonium Nitrate Fertilizer: Fertilizer Institute, 101 5 18th St., NW, Washington, DC 20036.

(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 surrounding exposures which require protection cannot be seen from the "donor" when the trees are bare of leaves, are also acceptable.

(6) For determining the distances to be maintained from inhabited buildings, passenger railways, and public highways, use the table in § 55.218.

(a) Special fireworks, pyrotechnic compositions and explosive materials used to assemble fireworks shall be stored at all times as required by this subpart unless they are in the process of manufacture, assembly, packaging, or are being transported.

(b) No more than 500 pounds (227 kg) of pyrotechnic compositions or explosive materials are permitted at one time in any fireworks mixing building, any building or area in which the pyrotechnic compositions or explosive materials are pressed or otherwise prepared for finishing or assembly, or any finishing or assembly building. All pyrotechnic compositions or explosive materials not in immediate use will be stored in covered, non-ferrous containers.

(c) The maximum quantity of flash powder permitted in any fireworks process building is 10 pounds (4.5 kg).

(d) All dry explosive powders and mixtures, partially assembled special fireworks, and finished special fireworks shall be removed from fireworks process buildings at the conclusion of a day's operations and placed in approved magazines.

[Added by TD. ATF-293, 55 FR 3717, Feb. 5, 1990]

Net Weight of Fireworks (1) Pounds	Special Fireworks (2) Feet	Common Fireworks (3) Feet
0-100	57	37
101-200	69	37
201-300	77	37
301-400	85	37
401-500	91	37
Above 500	Not Permitted (4) & (5)	Not Permitted (4) & (5)

NOTES to § 55.222, above.

(1) Net weight is the weight of all pyrotechnic compositions, and explosive materials and fuses only.

(2) The distances in this column apply only with natural or artificial barricades. If such barricades are not used, the distances must be doubled.

(3) While common fireworks in a finished state are not subject to regulation, explosive materials used to manufacture or assemble such fireworks are subject to regulation. Thus, fireworks process buildings and between fireworks process and buildings where common fireworks are being processed must meet these requirements.

(4) A maximum of 500 pounds of in-process pyrotechnic compositions, either loose or in partially-assembled fireworks, is permitted in any fireworks process building. Finished special fireworks may not be stored in a fireworks process building.

(5) A maximum of 10 pounds of flash powder, either in loose form or in assembled units, is permitted in any fireworks process building. Quantities in excess of 10 pounds must be kept in an approved magazine.

[Added by TD. ATF-293, 55 FR 3717, Feb. 5, 19901

Distance from Passenger Railways, Public Highways, Fireworks Plant Buildings Used to Store Common Fireworks, Magazines and Fireworks Shipping Buildings, and Inhabited Buildings (3) & (4).

Net Weight of Fireworks (1) Pounds	Special Fireworks (2) Feet	Common Fireworks (3) Feet
0-100	200	25
101-200	200	50
201-300	200	50
301-400	200	50
401-500	200	50
Above 500	Not Permitted	Not Permitted

NOTES to § 55.223, above.

(1) Net weight is the weight of all pyrotechnic compositions, and explosive materials and fuse only.

(2)While common fireworks in a finished state are not subject to regulation, explosive materials used to manufacture or assemble such fireworks are subject to regulation. Thus, fireworks process buildings and between fireworks process and buildings where common fireworks are being processed must meet these requirements.

(3) While common fireworks in a finished state are not subject to regulation, explosive materials used to manufacture or assemble such fireworks are subject to regulation. Thus, fireworks process buildings where common fireworks are being processed must meet these requirements. [F-293, 55 FR 3717, Feb. 5, 1990]

(4) The distances in this table apply with or without artificial or natural barricades or screen barricades. However, the use of barricades is highly recommended.

Net Weight of Fireworks (Pounds)	Distance Between Magazine and Inhabited Building, Passenger Railway or Public Highway (Feet) (3) & (4)	Distance Between Magazines (Feet) (2)
0- 1000	150	100
1001 - 5000	230	150
5001-10000	300	200
Above 10000	Use table in § 55.218

NOTES to § 55.224, above.

(1) Net weight is the weight of all pyrotechnic compositions, and explosive materials and fuses only.

(2) For the purposes of applying this table, the term "magazine" also includes fireworks shipping buildings for special fireworks.

(3) For fireworks storage magazines in use prior to March 7, 1990, the distances in this table may be halved if properly barricaded between the magazine and potential receptor sites.

(4) This table does not apply to the storage of bulk salutes. Use the table at § 55.218.

[Added by TD. ATF-293, 55 FR 3717, Feb. 5, 1990]