MIL-DTL-11733E
3.4 Closure. Cylinders shall be equipped with a steel flange in accordance with
MIL-C-17376/2. Each flange shall be drilled and threaded 3/4 national gas taper (NGT) and
fitted with a valve in accordance with MIL-DTL-2/8 and as specified in table I. Each cylinder
shall be expressed in pounds and quarter-pounds, expressed in four-ounce increments to the
nearest quarter-pound. The figures expressing pounds shall be separated from the figures
expressing ounces by a dash (-).
3.5 Tare weight. The tare weight of the cylinder shall be the weight of the cylinder, flange,
and valve, but excluding the valve protection cap. The tare weight shall be expressed in pounds
and quarter-pounds, expressed in four-ounce increments to the nearest quarter-pound. The figures
expressing pounds shall be separated from the figures expressing ounces by a dash (-).
3.6 Test date. The cylinders shall be delivered within one year of the test date stamped
on the cylinder.
3.7 Cylinder identification. Unless otherwise specified herein, marking shall be in
characters not less than 5/16 inch high.
3.7.1 Standard markings. Standard markings shall be plainly and permanently marked
by stamping on the shoulder of each cylinder starting near the neck as follows:
a. "DOT 4AA480".
b. Serial number (see 6.6), as registered with the Office of Hazardous Materials Safety,
in characters not less than 3/8 inch high for cylinders more than 6 inches in outside diameter.
c. "US GOVT", government symbol, as registered with the Office of Hazardous
Materials Safety.
d. Date of test, stamped diametrically opposite the above marking.
e. The inspector's official mark.
f. Manufacturer or retester mark, near the date of test (preferably right above it).
g. The tare weight shall be stamped in a position other than in sequence with the serial
number or test date and shall be preceded by the letters "TW".
3.7.2 Additional markings. In addition to the above markings, the cylinders shall bear
the following markings:
a. The name of the gas, stenciled on the cylinder in accordance with MIL-STD-101.
b. When specified (see 6.2), two decalcomanias conforming to drawing 810-1385867
shall be affixed diametrically opposite one another on the sides of the cylinder, 90 degrees from
the stenciled name of the gas.
3.8 Treatment and painting.
3.8.1 Cleaning. Each cylinder and cap shall be cleaned in accordance with TT-C-490.
Cleaning may be accomplished by one of the following methods:
a. Chemical methods such as solvent cleaning, alkaline cleaning, acid cleaning,
pickling, descaling with hydride, or paint stripping.
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