With all the different types of metals used
aboard ship, some way must be used to identify
these metals in the storeroom. The Navy uses two
systems to identify metals: the continuous
identification marking system and the color mark-
ing system. These systems have been designed
so even after a portion of the metal has been
removed, the identifying marks are still visible.
In the continuous identification marking
system, the identifying information is actually
painted on the metal with a heavy ink. This
marking appears at specified intervals over the
length of the metal. The marking contains the
producer’s trademark and the commercial
designation of the metal. The marking also
indicates the physical condition of the metal, such
as cold drawn, cold rolled, and seamless.
In the color marking system, a series of color
symbols with a related color code is used to
identify metals. The term color symbol refers to
a color marking actually painted on the metal. The
symbol is composed of one, two, or three colors
and is painted on the metal in a conspicuous place.
These color symbols correspond to the elements
of which the metal is composed.
For further information on the metals used
aboard ship, their properties and identification
systems, refer to the TRAMAN, Hull Mainte-
nance Technician 3 & 2, NAVEDTRA 10571-1,
chapter 4.
SUMMARY
In this chapter we have discussed some
of the basic laws and principles of physics
as they apply to the engineering ratings. We
covered matter, magnetism, electricity, Ohm’s
law, Newton’s laws, and mass and its different
properties. Mechanical energy, thermal energy,
and topics of energy transformations were
described. We also provided you information
on temperature, pressure definitions, principles
of hydraulics, principles of pneumatics, and
metals.
This chapter was provided to give you only
the basis on which to expand your knowledge of
electrical and mechanical fundamentals. It is
important that you have a sound understanding
of these laws and principles. The complex
electrical and mechanical systems and the
internal pressure-temperature relationships in an
engineering plant make it imperative that you
understand the material presented. If you have
problems understanding this material, you should
reread the pertinent portions until you have
absorbed the basic concepts. You will use this
information throughout your naval career.
Study this information so you will have a
good foundation of understanding within the
engineering department of your ship.
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