Missile magazines contain special features to
combat the effects of accidentally ignited rocket
motors. Restraining latches (e.g., cell latches) keep
each missile from moving in the magazine. Blowout
hatches, relief ports, and plenum exhaust vents pass
rocket motor gases to the atmosphere. This prevents
internal magazine pressures from building to
Missile magazines are normally equipped with
special combustion detection devices and contain
automatic sprinkler systems, with remote and local
activation capabilities. Missile magazines also have a
water injection or booster suppression system. A
carbon dioxide system may be installed in some
magazines, especially in unmanned spaces. Missile
magazines are insulated, have temperature control
systems, and must be closed and locked when
Ready-service magazines are located near the
missile launcher they serve. They provide permanent
stowage for part of the ships ammunition allowance,
especially gun-type ammunition. Generally,
ready-service magazines have many of the same
characteristics as primary magazines. They are
insulated, ventilated, and have manually activated
Missile magazines, although in a class by
themselves, are sometimes considered as
ready-service magazines. Ready-service magazines
must be closed and locked when unattended.
A locker can be a small compartment or space.
More often though, a locker is a metal box-like
structure. In either case, a locker provides stowage for
special types of ammunition such as detonators and
Lockers are frequently located on a ships weather
deck. They will be close to the weapon or area they are
intended to serve. A label installed on the outside of
each locker clearly identifies the type of explosives
contained within the locker.
The contents of a locker must be arranged in a neat
and orderly manner. When the lockers lid or door is
closed, it cannot contact (or jam) any part of the
ammunition. Securing and safety latches, hinges, and
other hardware must be well-maintained and in good
working condition. Sometimes, lockers are equipped
with a sprinkler or flooding system. If such a system is
installed, clear and legible operating instructions must
be prominently displayed. Lockers must be kept closed
and locked when unattended.
Magazines are fitted with appropriate
environmental control and safety features to protect
their ammunition from excessive temperatures and
Most magazines are equipped with mechanical
cooling or ventilation systems. However, there are a
few magazines that do not have either of these features.
If a magazine without controls shows a heat gain in
excess of 100 F, portable ventilation systems are used
to prevent overheating or condensation of moisture.
Supply and Exhaust Ventilation
Ventilation ducts and exhaust ventilation outlets to
and from magazines provide forced-air ventilation. Air
is forced through the ducts by electric fans installed
within the ducting. Standard covers maintain
water-tightness keep flames caused by hits on the ship
during combat from entering the magazines. These
covers must always be closed during combat (general
quarters) conditions unless there are imperative
reasons for doing otherwise.
Certain types of ammunition may produce fumes
that, if inhaled, may have a slightly intoxicating effect.
However, this should not appreciably reduce
individuals work efficiency. Generally, there is
sufficient air volume in large sealed magazines and
handling rooms to provide a safe working atmosphere.
Frequently, in hot climates, magazines can be
maintained at a lower average temperature by closing
off the supply of air during the heat of the day and
running the blowers only at night when cool air can be
forced in. During the day the magazine will heat slowly
by conduction rather than rapidly by the introduction
of heated air.
Magazine Vent Check Valves
It may be necessary to operate the sprinkler system
in magazines while the ventilation valves are secured.
During these times; the magazine must be vented by an
air escape to ensure that the pressure within the
magazine will not build up beyond the allowed
pressure limits of the watertight boundaries. Magazine