MIL-DTL-11732F
3.3 Cylinder processing.
3.3.1 Internal surfaces. The internal surfaces of drawn cylinders, prior to necking, shall
be free of mill scale, burrs, oxidation products and all foreign matter. When required, only iron-
based abrasives shall be used to remove unstable surfaces or oxidation products from the
cylinder wall. Metal discoloration, rust bloom, and fixed scale shall not be considered criteria
for cylinder rejection.
3.3.2 Cylinder cleaning. After necking, drilling, threading, and deburring, the cylinders
shall be cleared of loose particles by vacuum or by inverting the cylinder and applying a
compressed air sweep (see 6.3). The cylinder shall be flushed with hot fluids when necessary to
remove grease, oil, and fat from processing. Chemicals that will react with chlorine shall not be
used.
3.3.3 Cylinder drying. Internal cylinder moisture, from processing or hydrostatic testing,
shall be removed by inverting and steaming the surfaces until hot to the touch, followed by
drying with filtered air having a dew point less than 30 °F until the dew point of effluent gas is
less than 40 °F when tested in accordance with ASTM D2029 or by equivalent method. In lieu
of filtered air, drying by suction of ambient air through the cylinder is allowed. The residual air
in the dry cylinder shall be replaced by introducing dry nitrogen gas conforming to A-A-59503,
type I, grade B, through a bayonet extending to the bottom end of the cylinder. Closure shall be
carried out immediately to limit atmospheric interchange.
3.4 Closure. Cylinders shall be equipped with a flange and a cap conforming to
MIL-DTL-17376. A plug or closed valve conforming to A-A-59860, as specified, shall be
installed in the neck of the cylinder (see 6.2).
3.5 Tare weight. The tare weight of the cylinder shall be the weight of the cylinder,
flange, and valve, but exclude the valve protection cap. The tare weight shall be expressed in
pounds and ounces expressed in 4-ounce increments to the nearest quarter-pound. The figures
expressing pounds shall be separated from the figures expressing ounces by a dash (-). Example:
A tare weight marking of "119-4" indicates a weight of 119 pounds, 4 ounces.
3.6 Test date. The cylinders shall be delivered within 1 year of the test date stamped on
the cylinder.
3.7 Cylinder identification. Marking shall be in characters not less than 0.25 inch in
height.
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-3A480" or "DOT-3AA480" in characters not less than 0.375 inch in height for
cylinders greater than 6 inches in outside diameter.
b. Serial number (see 6.5), as registered with the Bureau of Explosives, in characters not
less than 0.5 inch in height for cylinders greater than 6 inches in outside diameter.
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