2.1 Manual sprinkler systems
2.1.1 Manual sprinkler system is sprinkler system
where the admission of water is controlled by manually actuated switches
or break glass stations. Water should fill the system and appropriate
valves and pumps should automatically operate upon actuation. These
systems may have nozzles with fusible elements.
2.1.2 Each protected zone served by a manual sprinkler
system should have two switches or break glass stations widely separated
with one switch for each protected zone located in the operating compartment
or other continuously manned control station. Switches and break glass
stations should be suitably protected from unauthorised use, and activation
should be alarmed in the operating compartment or the continuously
manned control station.
2.2 Automatic sprinkler systems
2.2.1 Wet pipe systems is sprinkler system employing
automatic sprinklers attached to a piping system containing water
and connected to a water supply so that water discharges immediately
from sprinklers opened by heat from a fire.
2.2.2 Dry pipe systems is sprinkler system employing
automatic sprinklers attached to a piping system containing air or
nitrogen under pressure, to release of which (as from the opening
of a sprinkler) permits the water pressure to open a valve known as
a dry pipe valve. The water then flows into the piping system and
out of the opened sprinklers.
2.3 Combination systems is a system employing
both manual and automatic actuation and having nozzles fitted with
fusible elements. Systems piping may be empty or filled with compressed
air. Each protected area is fitted with manually actuated break glass
stations. Water should fill the system and appropriate valves and
pumps should automatically operate upon actuation of a manual stations
or supplemental detection system. Additionally, a manually actuated
switch should be located in the operating compartment. Water should
fill the system, and appropriate valves and pumps should automatically
operate upon actuation of the switch.
2.4 Equivalent systems are sprinkler systems complying
with the Guidelines for approval of sprinkler systems equivalent to
that referred to in SOLAS regulation II-2/12 (resolution
A.755(18)). Such equivalent systems may be of the types referred to
in 2.1, 2.2 or 2.3. Administrations may modify certain of the following
hydraulic and pneumatic requirements for these systems consistent
with conditions for approved use.