3. Protect electrodes from ice. If ice forma-
tion is a serious problem, turn off current and
remove and store the electrodes during the freez-
ing season. Tank protection will continue for
about 3 weeks after the unit is out of operation.
Reinstall the electrodes at the end of the freezing
No special testing of nonfreeze systems is
required, other than an annual check of the
specific gravity of the non freeze solution. If the
specific gravity indicates a need for replenishing
the nonfreeze agent, be sure to add the same agent
as was previously used.
High-Speed Suppression Systems
Full operational testing of high-speed suppres-
sion systems is conducted at intervals not to
exceed 3 years except when mission requirements
justify change. A detector or a manual release sta-
tion must be actuated. Check to be certain that
all nozzles are operating. Then, follow these steps
to reset the system:
1. Replace pre-prime caps and/or rupture
2. Refill piping with water.
3. If the system uses an explosive valve,
replace the firing squib and the squib holder.
The need for maintenance is shown by
periodic inspections. It should include replace-
ment of worn or broken components and clean-
ing and flushing of systems. A regular schedule
of maintenance requirements should be devised.
Logs recording accomplished tasks should be
maintained as a record of the systems history.
Be sure to include manufacturers manuals for the
system components and consult them when
making repairs and adjusting or troubleshooting
Gaseous extinguishing systems are generally
found in areas where equipment is installed that
would be highly vulnerable to destruction from
water or dry chemical extinguishing agents.
Computer rooms, electronic gear such as radio
receiving and transmitting equipment, and power
generating facilities are examples of areas where
gaseous extinguishing system installation would
be desirable. In the Navy today, the Utilitiesman
will come in contact with two commonly used
systems. These are the carbon dioxide and the
halogenated gas systems. Each of these systems
is discussed in this section.
Gaseous extinguishing systems can be divided
into three general categories: local application,
total flooding, and hose line systems. Local
application systerms discharge agent onto the
burning material and are commonly used for pro-
tection of paint dip tanks, restaurant range hoods,
and special motors. Total flooding systems
discharge agent into and fill enclosed space. They
are commonly found in flammable liquid storage
rooms, computer installations, and transformer
vaults containing oil-filled equipment. Hose line
systems discharge extinguishing agent through
manually operated nozzles connected to a fixed
supply by piping and/or hoses. At present,
carbon dioxide is the only gaseous agent approved
for manual hose line systems.
CARBON DIOXIDE SYSTEMS
Here are two general methods of applying
carbon dioxide to extinguish a fire. One method
creates an inert atmosphere in the enclosure or
room where the fire is located for a prolonged
period of time. This method is called total
flooding. The second method is to discharge
carbon dioxide to the surface of liquids or
noncombustible surfaces coated with liquid
flammables. This method is known as local
Carbon dioxide is electrically nonconductive.
It is used extensively for the protection of
Figure 8-30.Typical cylinder arrangement for high-pressure