Copy (3) of IBC Code Commentary unload dockIBC Code Commentary
“Section 307.1 also clarifies that hazardous materials
outside of the building envelope should be classified
as outdoor storage. As such, hazardous material
quantities
on roofs or canopies are not included in
evaluating the occupancy classification of a building or
structure.”
COMBUSTIBLE LIQUID. A liquid having a closed cup
flash point at or above
100°F (38°C). Combustible liquids shall
be subdivided as follows:
Class II. Liquids having a closed cup flash point at or above
100°F (38°C) and below 140°F (60°C).
Class IIIA. Liquids
having a closed cup flash point at or
above 140°F (60°C) and below 200°F (93°C).
Class IIIB. Liquids having a closed cup flash point at or
above 200°F (93°C).
[F] 307.4 High-hazard
Group H-2. Buildings and structures
containing materials that pose a deflagration hazard or a hazard
from accelerated burning shall be classified as Group H-2. Such
materials shall include,
but not be limited to, the following:
Class I, II or IIIA flammable or combustible liquids which
are used or stored in normally open containers or
systems, or in closed containers or
systems pressurized at
more than 15 psi (103.4 kPa) gage.
Combustible dusts
Cryogenic fluids, flammable
Flammable gases
Organic peroxides, Class I
Oxidizers, Class 3, that are used or
stored in normally open
containers or systems, or in closed containers or systems
pressurized at more than 15 psi (103 kPa) gage
Pyrophoric liquids, solids and gases, nondetonable
Unstable
(reactive) materials, Class 3, nondetonable
Water-reactive materials, Class 3
[F] 307.5 High-hazard Group H-3. Buildings and structures
containing materials that readily support combustion
or that
pose a physical hazard shall be classified as Group H-3. Such
materials shall include, but not be limited to, the following:
Class I, II or IIIA flammable or combustible liquids
that
are used or stored in normally closed containers or
systems pressurized at 15 pounds per square inch gauge
(103.4 kPa) or less
Combustible fibers, other than densely packed baled
cotton
Consumer fireworks, 1.4G (Class C, Common)
Cryogenic fluids, oxidizing
Flammable solids
Organic peroxides, Class II and III
Oxidizers, Class 2
Oxidizers, Class 3, that are used
or stored in normally
closed containers or systems pressurized at 15 pounds per
square inch gauge (103 kPa) or less
Oxidizing gases
Unstable (reactive) materials, Class 2
Water-reactive materials, Class 2
TABLE 508.4
REQUIRED SEPARATION OF OCCUPANCIES (HOURS)
OCCUPANCY
F1 and S1 to H-2: 2 hour (w/sprinkler)
F1 and
S1 to H-3: 1 hour (w/sprinkler)
IMC 510.2 Hazardous exhaust system; where req’d; what concentration of vapor? <25%?