manually (fig. 11-7) or by remote control (manually or
automatically). There are three types of remote
Manual, by operating gears
Hydraulic, by means of control cocks and water
from the fire system or control cocks and oil
pressure supplied by hand pumps
Automatic, by means of a rate of rise or
combined rate of rise and fixed temperature
thermopneumatic control system
The rate of rise is indicated in a magazine when the
temperature increases rapidly (such as from a fire). The
rapid temperature increase activates the sprinkler-alarm
device (FH circuit), which, in turn, automatically
activates the sprinkler system control valve.
There are three alarms that are commonly
associated with all magazine sprinkler systemsa
sprinkling (FH circuit) alarm, a flooding (FD circuit)
alarm, and a high-temperature (F circuit) alarm.
High-temperature alarm systems (F circuit) are
installed in all of the following magazines or
Ammunition and propellant stowage areas
Ammunition handling spaces
Cargo ammunition holds to provide a means of
determining high temperatures
Dont confuse the F circuit with the FH circuit. The
F circuit detects a slow rise in temperature while the FH
circuit detects a rapid rise in temperature.
Install a minimum of two thermostats in each space.
Install a minimum of one thermostat for each 250 square
feet of deck area, or fraction of a deck area. If high
temperatures occur in any of the spaces containing
Figure 11-7.Typical manual control sprinkler system.