Extra Hazard Classification |
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| Extra hazard occupancies (Group 1) include
occupancies |
having uses and conditions similar to the following:
Aircraft hangars (except as governed by NFPA 409,
Standard
on Aircraft Hangars)
Combustible hydraulic fluid use areas
Die casting
Metal extruding
Plywood and particle board manufacturing
Printing [using inks having flash points below
100°F (38°C)]
Rubber reclaiming, compounding, drying, milling,
vulcanizing
Saw mills
Textile picking, opening, blending, garnetting,
or carding,
combining of cotton, synthetics, wool shoddy,
or burlap
Upholstering with plastic foams |
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| Extra hazard occupancies (Group 2) include
occupancies |
having uses and conditions similar to the following:
Asphalt saturating
Flammable liquids spraying
Flow coating
Manufactured home or modular building assemblies
(where
finished enclosure is present and has combustible
interiors)
Open oil quenching
Plastics processing
Solvent cleaning
Varnish and paint dipping
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Extra Hazard Pipe Schedule
Steel
1 in. 1 sprinkler
11/4 in. 2 sprinklers
11/2 in. 5 sprinklers
2 in. 8 sprinklers
21/2 in. 15 sprinklers
3 in. 27 sprinklers
31/2 in. 40 sprinklers
4 in. 55 sprinklers
5 in. 90 sprinklers
6 in. 150 sprinklers
For SI units, 1 in. = 25.4 mm.
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