GREASE EXTRACTOR HOOD
REMOTE
MANUAL
APPLIANCE DETECTOR W ITH
CONTROL
FUSIBLE LINK
BOX
PULL
PIN
LOCAL ALARM
PANELS
DEEP FAT
FR YERS
NOZZLES
INSTRUCTION
PLATES
PRESSURE RELIEF
INSET
CONTROL BOX
(SEE INSET)
RELEASE CABLE
RELEASE PIN
N2 CARTRIDGE
PRESSURE SWITCH
LEVER CONTROL HEAD
(SOME SHIPS)
PRESSURE SWITCH
VENT PLUG TEE
APC CYLINDER
TUBING TO APC
N 2 CARTRIDGE
CYLINDER
DCf0619
PRESSURE RELEASE CONTROL BOX
Figure 6-19. Aqueous potassium carbonate (APC) fire extinguishing system.
1. At the cylinder assembly, remove the release pin
Q19.
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
1.
Oxygen
and remove the release pin completely. This disconnects
the release cable and allows the extension spring to
2.
Bromine
activate the system as described under automatic
3.
Helium
operation.
4.
3. At the remote manual-control box, remove the
Q20.
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
1.
One
the extension spring to activate the system as described
under automatic operation.
2.
Two
3.
Three
REVIEW QUESTIONS
4.
Four
SUMMARY
Q18.
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,
systems.
aqueous film-forming foam (AFFF) systems, carbon
1.
True
dioxide (CO2) systems, Halon systems, and the
2.
False
aqueous potassium carbonate (APC) system.
6-18