couplings. All threaded parts of fire hose fittings and
couplings have standard threads and are easy to
connect. Hoses and fittings 1 1/2 inches and below
have standard pipe threads. Those 2 1/2 inches and over
have standard Navy hose threads.
Two people working together can quickly prepare a
fire hose. You can do the job alone if you place the hose
on the deck and hold it down with your foot just behind
the fitting. The pressure of your foot will cause the
metal fitting on the end of the hose to point upward. In
this position you can screw in the nozzle or other fitting.
Fire hose is usually located on a bulkhead rack near
a fireplug. Nozzles, extensions called applicators, and
spanner wrenches are stowed on the bulkhead near the
hose. See figure 12-4. When two lines are located
separately on the bulkhead, one is connected to the
firemain and the other is left unconnected.
HIGH-CAPACITY AFFF SYSTEMS
An AFFF station consists of a 600-gallon AFFF
concentrate tank, a single-speed injection pump or a
two-speed AFFF pump, electrical controllers, valves,
and necessary piping.
Saltwater and AFFF flow is
controlled by hydraulically operated valves, which are
actuated by solenoid-operated pilot valves (SOPVs).
The SOPVs are activated by electrical switches at user
locations (Pri-Fly, NAVBRIDGE, hose stations, and
CON-FLAG stations).
The injection pump system supplies the flush deck
nozzles on the flight deck, and the deck edge nozzles on
CVNs and some CVs. The two-speed pump operates at
27 or 65 gpm, depending upon the demand.
The
low-rate output will supply handlines and small
sprinkler systems.
High-demand systems, such as
hangar bay sprinklers, are served by the high-speed
output. On selected CVs, the two-speed pump supplies
the deck edge nozzles.
Hangar Deck AFFF Sprinkler System
The AFFF sprinkler systems are installed in the
overhead of the hangar deck. The sprinkler system is
divided into groups that can be individually actuated.
Each group is supplied from two risers—one from a
port AFFF injection station and one from a starboard
AFFF injection station. Controls to start and stop flow
to individual sprinkler groups are located in the
conflagration (CONFLAG) stations and along each
side of the hangar deck near the related sprinkler group.
Flight Deck AFFF Extinguishing System
Flight decks have an AFFF fire-fighting system that
consists of flush-deck, flush-deck cannon-type, and
deck-edge nozzles installed in combination with the
12-5
FIRE PLUG (VALVE)
SPANNER WRENCHES
CLOSED POSITION
OPEN POSITION
(TO INDICATE LEAKAGE)
WYE-GATE
CONNECTED
TO FIRE PLUG
ALL HOSE SHALL BE A MINIMUM
OF 6” OFF THE DECK
ANf1204
Figure 12-4.—Typical fire hose station.
