415.6.1.4 Explosive materials.

Group H-2 and H-3 occupancies containing materials with explosive characteristics shall be separated as required by the New York City Fire Code. Where separations are not specified, the distances required shall not be less than the distances required by Table 415.6.1.

Table 415.6.1
Minimum Separation Distances for Buildings Containing Explosives f 

Quantity of Explosives a, d		Minimum Distance (feet)
		Lot lines b and inhabited buildings c		Separation of magazines e
Pounds over	Pounds not over	Barricaded	Unbarricaded
0	5	70	140	12
5	10	90	180	16
10	20	110	220	20
20	30	125	250	22
30	40	140	280	24
40	50	150	300	28
50	75	170	340	30
75	100	190	380	32
100	125	200	400	36
125	150	215	430	38
150	200	235	470	42
200	250	255	510	46
250	300	270	540	48
300	400	295	590	54
400	500	320	640	58
500	600	340	680	62
600	700	355	710	64
700	800	375	750	66
800	900	390	780	70
900	1,000	400	800	72

 

For SI: 1 pound = 0.454 kg, 1 foot = 304.8 mm.

a.   The number of pounds of explosives listed is the number of pounds of trinitrotoluene (TNT) or the equivalent pounds of other explosive.

b.   The distance listed is the distance to lot line, including lot lines at public ways.

c.   For the purpose of this table, an inhabited building is any building on the same tax lot that is regularly occupied by people. Where two or more buildings containing explosives or magazines are located on the tax lot, each building or magazine shall comply with the minimum distances specified from inhabited buildings and, in addition, they shall be separated from each other by not less than the distance shown for "Separation of magazines", except that the quantity of explosive materials contained in detonator buildings or magazines shall govern in regard to the spacing of said detonator buildings or magazines from buildings or magazines containing other explosive materials. If any two or more buildings or magazines are separated from each other by less than the specified "Separation of magazines" distances, then such two or more buildings or magazines, as a group, shall be considered as one building or magazine, and the total quantity of explosive materials stored in such group shall be treated as if the explosive were in a single building or magazine located on the site of any building or magazine of the group, and shall comply with the minimum distance specified from other magazines or inhabited buildings.

d.   Storage of explosives in a quantity exceeding 1,000 pounds in one magazine is prohibited.

e.   Magazine is a building or structure, other than an operating building, approved for storage of explosive materials. Portable or mobile magazines not exceeding 120 square feet (11 m 2 ) in area need not comply with the requirements of this code, however, all magazines shall comply with the New York City Fire Code.

f.   This table shall not apply to the temporary storage incidental to transportation.

415.6.2 Detached buildings for Group H-1, H-2 or H-3 occupancy.

The storage or use of hazardous materials in excess of those amounts listed in Table 415.6.2 shall be in accordance with the applicable provisions of Sections 415.7 and 415.8

Table 415.6.2
Detached Building Required

A Detached Building Is Required When the Quantity of Material Exceeds That Listed Herein
Material	Class	Solids and Liquids (tons) a, b	Gases (cubic feet) a, b
Explosives	Division 1.1 Division 1.2 Division 1.3 Division 1.4 Division 1.4c  Division 1.5 Division 1.6	Maximum Allowable Quantity Maximum Allowable Quantity Maximum Allowable Quantity Maximum Allowable Quantity 1 Maximum Allowable Quantity Maximum Allowable Quantity	Not Applicable
Oxidizers	Class 4	Maximum Allowable Quantity	Maximum Allowable Quantity
Unstable (reactives) detonable	Class 3 or 4	Maximum Allowable Quantity	Maximum Allowable Quantity
Oxidizer, liquids and solids	Class 3 Class 2	1,200 2,000	Not Applicable Not Applicable
Organic peroxides	Detonable Class I Class II Class III	Maximum Allowable Quantity Maximum Allowable Quantity 25 50	Not Applicable Not Applicable Not Applicable Not Applicable
Unstable (reactives) nondetonable	Class 3 Class 2	1 25	2,000 10,000
Water reactives	Class 3 Class 2	1 25	Not Applicable Not Applicable
Pyrphoric gases	Not Applicable	Not Applicable	2,000

 

For SI: 1 ton = 906 kg, 1 cubic foot = 0.02832 m 3 , 1 pound = 0.454 kg.

a.   For materials that are detonable, the distance to other buildings or lot lines shall be as specified in Table 415.6.1 based on trinitrotoluene (TNT) equivalence of the material. For materials classified as explosives, see the New York City Fire Code. Unclassified detonable organic peroxides, detonable pyrophoric materials, detonable unstable (reactive) materials and detonable water-reactive materials shall be considered as explosives for the purposes of storage.

b.   "Maximum Allowable Quantity" means the maximum allowable quantity per control area set forth in Table 307.1(1).

c.   Limited to Division 1.4 materials and articles, including articles packaged for shipment, that are not regulated as an explosive under Bureau of Alcohol, Tobacco, Firearms and Explosives (BATF) regulations or unpackaged articles used in process operations that do not propagate a detonation or deflagration between articles, provided the net explosive weight of individual articles does not exceed 1 pound.

415.6.2.1 Wall and opening protection.

Where a detached building is required by Table 415.6.2, there are no requirements for wall and opening protection based on fire separation distance.

415.7 Special provisions for Group H-1 occupancies.

Group H-1 occupancies shall be in detached buildings used for no other purpose, shall not exceed one story in height and be without basements, crawl spaces or other under-floor spaces. Roofs shall be of lightweight construction with suitable thermal insulation to prevent sensitive material from reaching its decomposition temperature. Group H-1 occupancies containing materials that are in themselves both physical and health hazards in quantities exceeding the maximum allowable quantities per control area in Table 307.1(2) shall comply with requirements for both Group H-1 and H-4 occupancies.

415.7.1 Floors in storage rooms.

Floors in storage areas for organic peroxides, pyrophoric materials and unstable (reactive) materials shall be of liquid-tight, noncombustible construction.

415.8 Special provisions for Group H-2 and H-3 occupancies.

Group H-2 and H-3 occupancies containing quantities of hazardous materials in excess of those set forth in Table 415.6.2 shall be in detached buildings used for manufacturing, processing, dispensing, use or storage of hazardous materials. Materials listed for Group H-1 occupancies in Section 307.3 are permitted to be located within Group H-2 or H-3 detached buildings provided the amount of materials per control area do not exceed the maximum allowed quantity specified in Table 307.1(1).

415.8.1 Multiple hazards.

Group H-2 or H-3 occupancies containing materials that are in themselves both physical and health hazards in quantities exceeding the maximum allowable quantities per control area in Table 307.1(2) shall comply with requirements for Group H-2, H-3 or H-4 occupancies as applicable.