Rule 903. (1) "Dry chemical extinguishing system" means a system of pipes or
hoses, nozzles, an actuating device, an expellant gas and a container holding a dry
chemical. When activated, the expellant gas carries the dry chemical in suspension
to stop the combustion chain reaction.
(2) "Dry chemical" means an agent, capable of extinguishing a fire, composed of
very small particles, such as sodium bicarbonate, potassium bicarbonate, or
monoammonium phosphate, with added particulate material supplemented by special
treatment to prevent caking and providing flowability.
(3) "Dry pipe system" means an automatic sprinkler system employing
compressed air or other nonflammable gases in the system instead of water. When a
sprinkler opens, relieving the air pressure, water pressure opens a dry pipe valve filling
the system with water. This system is normally used where piping is exposed to freezing
(4) "Fire pump" or "booster pump" means a water pump used to supply water
from a suction supply at a specific pressure and volume to a sprinkler or standpipe
(5) "Fixed fire equipment" means a fire extinguishing system which is
permanently mounted and portions of those systems which may be portable, such as a
hose and nozzle attached to a fixed supply of extinguishing agent.
(6) "Flammable liquid" means any liquid having a flashpoint below 100 degrees
(7) "Flammable material" means that material which ignites easily, burns intensely,
or has a rapid rate of flame spread.
(8) "Foam-water spray system" means a special system, pipe-connected to a source
of foam concentrate and to a water supply, equipped with appropriate devices for
extinguishing agent discharge and distribution over the area or equipment to be
History: 1979 AC; 1984 AACS.
R 408.10905 Definitions; H to P.
Rule 905. (1) "Halogenated extinguishing system" means a fixed system of pipes or
hoses, nozzles, an actuating device and a container containing a halogenated agent under
pressure. The agent inhibits the chemical reaction of fuel and oxygen, thus stopping the
combustion chain reaction.
(2) "High expansion foam system" means a system of flooding an area with an
aggregation of bubbles mechanically generated by the passage of air or gas through a net
or screen which is wetted by a solution of foaming agents and generated as a foam in
a ratio of 100 to 1000 to 1.
(3) "Local fire alarm system" means a system of boxes or devices which will
manually or automatically activate a visual or audible alarm, or both, to alert an
(4) "Predischarge or discharge alarm" means an audible or visual device
interconnected with an extinguishing system and a detecting actuating device.
History: 1979 AC.