Page 82 - 2018_IFC

DEFINITIONS

TIMBER AND LUMBER PRODUCTION FACILITIES. provided that connects the cylinder valves enabling gas to be
Facilities where raw wood products are processed into fin- discharged from one or more tubes or cylinders through a
ished wood products. piping and control system.
TIRES, BULK STORAGE OF. Storage of tires where the TWENTY-FOUR HOUR BASIS. See “24-hour basis”
3
area available for storage exceeds 20,000 cubic feet (566 m ). before the “A” entries.
TOOL. A device, storage container, workstation or process UMBRELLA STRUCTURE. A structure, enclosure or
machine used in a fabrication area. shelter with or without sidewalls or drops, constructed of fab-
TORCH-APPLIED ROOF SYSTEM. Bituminous roofing ric or pliable material supported by a central pole or poles
systems using membranes that are adhered by heating with a (see “Tent”).
torch and melting asphalt back coating instead of mopping UNAUTHORIZED DISCHARGE. A release or emission
hot asphalt for adhesion. of materials in a manner which does not conform to the provi-
[A] TOWNHOUSE. A single-family dwelling unit con- sions of this code or applicable public health and safety regu-
structed in a group of three or more attached units in which lations.
each unit extends from the foundation to roof and with open UNSTABLE (REACTIVE) MATERIAL. A material, other
space on not less than two sides. than an explosive, which in the pure state or as commercially
TOXIC. A chemical falling within any of the following cate- produced, will vigorously polymerize, decompose, condense
gories: or become self-reactive and undergo other violent chemical
changes, including explosion, when exposed to heat, friction
1. A chemical that has a median lethal dose (LD ) of or shock, or in the absence of an inhibitor, or in the presence
50
more than 50 milligrams per kilogram, but not more of contaminants, or in contact with incompatible materials.
than 500 milligrams per kilogram of body weight when Unstable (reactive) materials are subdivided as follows:
administered orally to albino rats weighing between
200 and 300 grams each. Class 4. Materials that in themselves are readily capable
of detonation or explosive decomposition or explosive
2. A chemical that has a median lethal dose (LD ) of
50 reaction at normal temperatures and pressures. This class
more than 200 milligrams per kilogram but not more includes materials that are sensitive to mechanical or
than 1,000 milligrams per kilogram of body weight localized thermal shock at normal temperatures and pres-
when administered by continuous contact for 24 hours sures.
(or less if death occurs within 24 hours) with the bare
skin of albino rabbits weighing between 2 and 3 kilo- Class 3. Materials that in themselves are capable of deto-
grams each. nation or of explosive decomposition or explosive reaction
but which require a strong initiating source or which must
3. A chemical that has a median lethal concentration
(LC ) in air of more than 200 parts per million but not be heated under confinement before initiation. This class
50 includes materials that are sensitive to thermal or mechan-
more than 2,000 parts per million by volume of gas or
vapor, or more than 2 milligrams per liter but not more ical shock at elevated temperatures and pressures.
than 20 milligrams per liter of mist, fume or dust, when Class 2. Materials that in themselves are normally unsta-
administered by continuous inhalation for 1 hour (or ble and readily undergo violent chemical change but do
less if death occurs within 1 hour) to albino rats weigh- not detonate. This class includes materials that can
ing between 200 and 300 grams each. undergo chemical change with rapid release of energy at
TRAFFIC CALMING DEVICES. Traffic calming devices normal temperatures and pressures, and that can undergo
are design elements of fire apparatus access roads such as violent chemical change at elevated temperatures and
street alignment, installation of barriers, and other physical pressures.
measures intended to reduce traffic and cut-through volumes, Class 1. Materials that in themselves are normally stable
and slow vehicle speeds. but which can become unstable at elevated temperatures
[BG] TRANSIENT. Occupancy of a dwelling unit or sleep- and pressure.
ing unit for not more than 30 days. UNWANTED FIRE. A fire not used for cooking, heating or
[BG] TRANSIENT AIRCRAFT. Aircraft based at another recreational purposes or one not incidental to the normal
location and that is at the transient location for not more than operations of the property.
90 days. USE (MATERIAL). Placing a material into action, includ-
TRANSVERSE FLUE SPACE. See “Flue space—Trans- ing solids, liquids and gases.
verse.” VAPOR PRESSURE. The pressure exerted by a volatile
TRASH. See “Rubbish.” fluid as determined in accordance with ASTM D323.
TROUBLE SIGNAL. A signal initiated by the fire alarm [M] VENTILATION. The natural or mechanical process of
system or device indicative of a fault in a monitored circuit or supplying conditioned or unconditioned air to, or removing
component. such air from, any space.
TUBE TRAILER. A semitrailer on which a number of tubu- VESSEL. A motorized watercraft, other than a seaplane on
lar gas cylinders have been mounted. A manifold is typically the water, used or capable of being used as a means of trans-

2018 INTERNATIONAL FIRE CODE ® 49
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