otherwise tamper with the straps without proper
Never replace or pull a fuse. Only authorized
personnel are allowed to do such work.
Motors and generators often have openings in
their casings. Avoid dropping tools or other
objects into the openings. Some machinery and
electrical circuits generate magnetic fields, so be
alert; dont let magnetic tools you are holding be
drawn to such equipment.
Electrical and electronic equipment and power
cables are identified by nameplates, tags, or other
markings. Never paint over such identification
Dont hang items on, or secure lines to, any
power cable, antennas, wave guide, or other
electrical or electronic equipment.
Dont use personal electrical equipment aboard
ship without the approval of the engineer officer.
Compressed gases includes air, oxygen, acetylene,
carbon dioxide, and other gaseous or gas-forming
compounds held under pressure in steel bottles,
cylinders, or tanks. In general, three types of hazards are
connected with compressed gases as follows:
1. Cylinders containing compressed gas are
usually round and long. They are made of heavy steel.
Unless secured to a structure, they can roll, tip over, or
bang around. If not secured properly, they can roll
around and cause damage by bumping into a person or
2. T h e
c y l i n d e r s
c o n t a i n
g a s
u n d e r
pressureoften under very high pressure. A cracked
cylinder can fly apart. Air or gas from a valve or hose
connected to a cylinder can blow dirt into your eyes; or
the hose can whip around and strike you, causing an
injury. If you drop or mishandle an oxygen cylinder so
that its valve breaks off, you may see the heavy steel
bottle take off like a rocketcausing injury and
3. The cylinders may contain gases that are
poisonous, flammable, or explosive, and often all three.
Acetylene cylinders are common aboard ship. If you
ignite acetylene, it will blaze with intense heat; if its
mixed with air and a spark gets to it, it will explode. In
fact, an acetylene cylinder can explode if it is overheated
and then given a sudden blow. If oxygen comes into
contact with oil or grease, you can be sure you will have
a fire. CO
used in fire extinguishers is particularly
dangerous; you will suffocate in a room filled with it.
is extremely cold when it is discharged. It
may cause painful blisters if it comes in contact with
You must handle, work with, and work around
compressed gas cylinders with care and caution. The
cylinders are heavy and can easily be tipped.
In general, weather-deck stowage will be provided
for flammable and explosive gases. However, in specific
cases, the approval of below-deck stowage depends on
the particular type, mission, and arrangement of the
ship. In such cases, these approved locations are shown
on the ships plans.
Compressed gases aboard all ships, except cargo
ships, should be stowed in compartments designed for
stowage of gas cylinders. In such cases, the following
precautions must be observed:
Take the necessary steps to prevent the
m a x i m u m t e m p e r a t u r e o f t h e s t ow a g e
compartment from exceeding 130F.
When provisions are made for mechanical
ventilation, operate this ventilation according to
the damage control classification assigned.
The classification for closure of this system is
ZEBRA (Z), CIRCLE WILLIAM [(W)], and
In compartments designated for stowing
flammable or explosive gases, the installation of
portable electric wiring and equipment isnt