while a sixth class has been reserved for fire protection
equipment. A standard color has been chosen to represent
each of these classes and is shown in table 4-2.
Since you work with fuel gas and oxygen, you must
become familiar with the colors of the cylinders in which
these gases are contained. The fuel-gas cylinder is yellow,
and the oxygen cylinder is green.
In addition to color coding, the exact identification of
the material contained in a compressed-gas cylinder must
be indicated by a written title that appears in two
locations-diametrically opposite and parallel to the
longitudinal axis of the cylinder. Cylinders, having a
background color of yellow, orange, or buff have the title
painted black Cylinders, having a background color of red,
brown, black, blue, gray, or green, have the title painted
COLOR WARNINGS. The appearance on the
body, top, or as a band(s) on compressed-gas cylinders of
the six colors specified should provide a warning of danger
from the hazard involved.
CYLINDER COLOR BANDS. Cylinder color
bands appear upon the cylinder body and serve as color
warnings when they are yellow, brown, blue, green, or
gray. The bands also provide color combinations to
separate and distinguish cylinders for convenience in
handling, storage, and shipping. Color bands for
segregation purposes will not be specified for new
materials not presently covered by MIL-STD-101B.
DECALS. Two decals may be applied on the
shoulder of each cylinder. They should be diametrically
opposite and at right angles to the titles. They should
indicate the name of the gas, precautions for handling, and
use. A background color corresponding to the primary
warning color of the contents should be used.
SHATTERPROOF CYLINDERS. A shatter-
proof cylinder should be stenciled with the phrase NON-
SHAT longitudinally 90 degrees from the titles. Letters
must be black or white and approximately 1 inch in size.
SERVICE OWNERSHIP. On cylinders owned
by or procured for the Department of Defense, the
bottom and the lower portion of the cylinder body
opposite the valve end may be used for service
The six colors identified in table 4-2 are used on the
body and top of, or as a band on, a compressed-gas cylinder
to serve as a warning of the hazard involved in handling
the type of material contained in the cylinder.
Figure 4-32 shows titles and color codes for
compressed-gas cylinders most often found in a construction
Figure 4-33.Identifying color patterns for gas cylinders.
battalion or in a public works department where Seabee
personnel are working. Figure 4-33 shows how cylinders are
identified by the overall painted color code and