GREASE EXTRACTOR HOOD
APPLIANCE DETECTOR W ITH
LEVER CONTROL HEAD
VENT PLUG TEE
TUBING TO APC
N 2 CARTRIDGE
PRESSURE RELEASE CONTROL BOX
Figure 6-19. Aqueous potassium carbonate (APC) fire extinguishing system.
1. At the cylinder assembly, remove the release pin
Each APC system includes one or two
in the lever-control head completely, and operate the
cylinders filled with a solution of potassium
carbonate in water pressurized with what type
lever. This discharges the cylinder directly.
of compressed gas?
2. At the pressure release control box, open the box
and remove the release pin completely. This disconnects
the release cable and allows the extension spring to
activate the system as described under automatic
3. At the remote manual-control box, remove the
The APC system has a total of how many
release pin completely. This disconnects the anchored
manual modes of operation?
end of the release cable, releases the tension, and allows
the extension spring to activate the system as described
under automatic operation.
Aqueous potassium carbonate (APC)
fire-extinguishing systems are installed in
In this chapter, you have been introduced to the
naval ships to provide protection for deep fat
design and function of the major installed shipboard
fire-fighting systems. The systems include the
and doughnut fryers and their exhaust
firemain systems, magazine sprinkler systems,
aqueous film-forming foam (AFFF) systems, carbon
dioxide (CO2) systems, Halon systems, and the
aqueous potassium carbonate (APC) system.