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Group H occupancies containing quantities of hazardous materials in excess of those set forth in Table 5003.8.2 shall be in detached buildings.
TABLE 5003.8.2
DETACHED BUILDING REQUIRED
A DETACHED BUILDING IS REQUIRED WHERE 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 Maximum Allowable Quantity Not Applicable
Division 1.2
Maximum Allowable Quantity
Division 1.3
Maximum Allowable Quantity
Division 1.4
Maximum Allowable Quantity
Division 1.4c
1
Division 1.5
Maximum Allowable Quantity
Division 1.6
Maximum Allowable Quantity
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 1,200 Not Applicable
Class 2
2,000
Organic peroxides Detonable Maximum Allowable Quantity Not Applicable
Class I
Maximum Allowable Quantity
Class II
25
Class III
50
Unstable (reactives) nondetonable Class 3 1 2,000
Class 2
25
10,000
Water reactives Class 3 1 Not Applicable
Class 2
25
Pyrophoric gasesd Not Applicable Not Applicable 2,000
For SI: 1 pound = 0.454 kg, 1 cubic foot = 0.02832 m3, 1 ton = 2000 lb. = 907.2 kg.
  1. For materials that are detonable, the distance to other buildings or lot lines shall be in accordance with Section 415.6 of the International Building Code or Chapter 56 based on the trinitrotoluene (TNT) equivalence of the material, whichever is greater.
  2. "Maximum Allowable Quantity" means the maximum allowable quantity per control area set forth in Table 5003.1.1(1).
  3. 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 regulations, or unpackaged articles used in process operations that do not propagate a detonation or deflagration between articles, providing the net explosive weight of individual articles does not exceed 1 pound.
  4. Detached buildings are not required for gases in gas rooms that support H-5 fabrication facilities where the gas room is separated from other areas by a fire barrier with a fire-resistance rating of not less than 2 hours and the gas is located in a gas cabinet that is internally sprinklered, equipped with continuous leak detection, automatic shutdown, and is not manifolded upstream of pressure controls. The gas supply is limited to cylinders that do not exceed 125 pounds water capacity in accordance with DOTn 49 CFR 173.192 for Hazard Zone A toxic gases.

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