415.11.1 Fabrication areas.

Fabrication areas shall comply with Sections 415.11.1.1 through 415.11.1.8.

415.11.1.1 Hazardous materials.

Hazardous materials and hazardous production materials (HPM) shall comply with Sections 415.11.1.1.1 through 415.11.1.1.2.

415.11.1.1.1 Aggregate quantities.

The aggregate quantities of hazardous materials stored and used in a single fabrication area shall not exceed the quantities set forth in Table 415.11.1.1.1.

   Exception: The quantity limitations for any hazard category in Table 415.11.1.1.1 shall not apply where the fabrication area contains quantities of hazardous materials not exceeding the maximum allowable quantities per control area established by Tables 307.1(1) and 307.1(2).

Table 415.11.1.1.1
Quantity Limits for Hazardous Materials in a Single Fabrication Area in Group H-5 a

Hazard Category	Solids (pounds per square foot)	Liquids (gallons per square foot)	Gas (cubic feet @ NTP/square foot)
Physical-Hazard Materials
Combustible dust	Note b	Not Applicable	Not Applicable
Combustible fiber   Loose          Baled	Note b Notes b, c	Not Applicable	Not Applicable
Combustible liquid   II          IIIA          IIIB Combination Class   I, II and IIIA	Not Applicable	0.01 0.02 Not Limited 0.04	Not Applicable
Cryogenic gas      Flammable          Oxidizing	Not Applicable	Not Applicable	Note d 1.25
Explosives	Note b	Note b	Note b
Flammable gas   Gaseous       Liquefied	Not Applicable	Not Applicable	Note d Note d
Flammable liquid   IA          IB          IC Combination Class   IA, IB and IC Combination Class   I, II and IIIA	Not Applicable	0.0025 0.025 0.025 0.025 0.04	Not Applicable
Flammable solid	0.001	Not Applicable	Not Applicable
Organic peroxide    Unclassified detonable    Class I    Class II    Class III    Class IV    Class V	Note b Note b 0.025 0.1 Not Limited Not limited	Not Applicable	Not Applicable
Oxidizing gas      Gaseous          Liquefied Combination of gaseous and liquefied	Not Applicable	Not Applicable	1.25 1.25 1.25
Oxidizer      Class 4          Class 3          Class 2          Class 1 Combination      Class 1, 2, 3	Note b 0.003 0.003 0.003 0.003	Note b 0.03 0.03 0.03 0.03	Not Applicable
Pyrophoric material	0.01	0.00125	Notes d and e
Unstable reactive   Class 4          Class 3          Class 2          Class 1	Note b 0.025 0.1 Not Limited	Note b 0.0025 0.01 Not Limited	Note b Note b Note b Not Limited
Water reactive      Class 3          Class 2          Class 1	Note b 0.25 Not Limited	0.00125 0.025 Not Limited	Not Applicable
Health-Hazard Materials
Corrosives	Not Limited	Not Limited	Not Limited
Highly toxic	Not Limited	Not Limited	Note d
Toxics	Not Limited	Not Limited	Note d

 

For SI: 1 pound per square foot = 4.882 kg/m2, 1 gallon per square foot = 40.7 L/m2, 1 cubic foot @ NTP/square foot = 0.305 m 3 @ NTP/m2, 1 cubic foot = 0.02832 m 3

a.   Hazardous materials within piping shall not be included in the calculated quantities.

b.   Quantity of hazardous materials in a single fabrication shall not exceed the maximum allowable quantities per control area in Tables 307.1(1) and 307.1(2).

c.   Densely packed baled cotton that complies with the packing requirements of ISO 8115 shall not be included in this material class.

d.   The aggregate quantity of flammable, pyrophoric, toxic and highly toxic gases shall not exceed 9,000 cubic feet at NTP.

e.   The aggregate quantity of pyrophoric gases in the building shall not exceed the amounts set forth in Table 415.6.2.

415.11.1.1.2 Hazardous production materials.

The maximum quantities of hazardous production materials (HPM) stored in a single fabrication area shall not exceed the maximum allowable quantities per control area established by Tables 307.1(1) and 307.1(2).

415.11.1.2 Separation.

Fabrication areas, whose sizes are limited by the quantity of hazardous materials allowed by Table 415.11.1.1.1, shall be separated from each other, from corridors and from other parts of the building by not less than 1-hour fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both.

   Exceptions:

      1.   Doors within such fire barrier walls, including doors to corridors, shall be only self-closing fire door assemblies having a fire protection rating of not less than 3/4 hour.

      2.   Windows between fabrication areas and exit access corridors are permitted to be fixed glazing listed and labeled for a fire protection rating of not less than 3/4 hour in accordance with Section 716.

415.11.1.3 Location of occupied levels.

Occupied levels of fabrication areas shall be located at or above the first story above grade plane.

415.11.1.4 Floors.

Except for surfacing, floors within fabrication areas shall be of noncombustible construction.

Openings through floors of fabrication areas are permitted to be unprotected where the interconnected levels are used solely for mechanical equipment directly related to such fabrication areas (see also Section 415.11.1.5).

Floors forming a part of an occupancy separation shall be liquid tight.