MIL-DTL-11732F
c. "US GOVT", Government symbol, 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.
d. The inspector's official mark.
e. Date of test, stamped diametrically opposite the above marking.
f. Manufacturer's or re-tester's 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 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 decals conforming to drawing 810-1385867 shall be
affixed diametrically opposite to 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:
a. Chemical methods such as solvent cleaning, alkaline cleaning, acid cleaning, pickling,
descaling with hydride, or paint stripping; or,
b. Electrochemical cleaning methods such as electrolyte alkaline, electro-polishing, or
electrolytic pickling; or,
c. Mechanical means such as blasting, chipping, wire brushing, or grinding.
3.8.1.1 Blasting. Where blasting is appropriate, blast in accordance with SSPC-SP 6,
unless SSPC-SP 5 or SSPC-SP 10 is specified (see 6.2). Blasting shall not be used on surfaces
that could be damaged by blasting or on components containing such surfaces unless protective
masking has been applied.
3.8.2 Treatment. Cylinders shall be treated as soon as possible after cleaning, as
specified in 3.8.1, with a zinc phosphate chemical conversion coating in accordance with
TT-C-490, type I.
3.8.3 Painting. Coatings shall be applied in an ambient temperature of not less than
50 °F and not more than 90 °F. Paint shall be applied by any method that will deposit the
specified film coat thickness and comply with any applicable transfer efficiency regulations.
Paint and surface shall be approximately the same temperature except when hot spray is used.
3.8.3.1 Bottom coating. Calcium sulfonate coating, such as Watson Armor Shield or an
equivalent, shall be applied to each dry, clean cylinder bottom and footring, when applicable, as
soon as practicable after cleaning and treatment (see 3.8.1 and 3.8.2). Dry film thickness of the
bottom coating shall be 3.0 to 7.0 one-thousandth of an inch (mil).
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