2.1
Caking is a chemical reaction
between dry chemical powder and moisture that causes individual particles
of the medium to bind together to form an aggregate mass.
2.2
Dry chemical powder is an extinguishing
medium consisting of very fine particles of sodium or potassium bicarbonate
treated or supplemented with additional materials to prevent packing
and caking (moisture absorption) and to ensure consistent flow characteristics.
2.3
Dry chemical powder unit is a
complete system including dry chemical storage container(s), pressurizing
gas storage container(s), controls, piping and hand hose lines.
2.4
Gas point is a defined point
in the discharge of a dry chemical powder unit when the discharge
of dry chemical powder ends, and is marked by a change in the nozzle
stream to the discharge of primarily pressurizing gas.
2.5
Hand hose line is a hand-held
dry chemical powder nozzle covering cargo areas not covered by a monitor.
2.6
Monitor is a fixed dry chemical
powder nozzle protecting cargo loading and discharge manifold areas.
2.7
Packing is a phenomenon that
occurs when dry chemical powder stored in a container is subjected
to vibration causing the smaller particles to move to the bottom of
the container and the larger particles to travel to the top.
2.8
Pressurizing medium is the gas
used to expel the dry chemical from the system, usually dry nitrogen.