MIL-STD-1411B
deoxidizing primer is used, the finish paint shall be compatible with the hard prime base and react with inseparable adhesive properties when curing is completed.
5.3.6.5 Finish coating. The finish coat of exterior paint shall be sprayed over a cured prime paint to a thickness that will ensure smooth and even flow that will be free of pits and achieve a sealed glossy surface. Excessive thickness will be regarded as an inferior quality. A heavy buildup of cured paint residue promotes chipping and scratching.
5.3.6.6 Touch-up painting. Touch-up painting may be applied to cylinders displaying localized chipping, such as chipping from an anchoring chain, or when specified in the contract or the delivery order. Excessive chipping will require stripping and refinishing the cylinder completely (see 5.2.2.1).
5.4 Cylinder charging. Except for acetylene, butane, propane, anhydrous ammonia, and carbon dioxide, each cylinder shall be evacuated to an absolute pressure of 3 inches of mercury or greater and maintained for a minimum of 2 minutes before charging begins. The cylinder shall be charged with the applicable gas equivalent to the marked service pressure or with
liquefied gas to its authorized weight in accordance with the cylinder design. Any gas bled from cylinders must be disposed of in accordance with current environmental requirements.
5.4.1 Charging cylinders with permanent gas (oxygen, nitrogen, hydrogen, argon, helium, air, and carbon monoxide). These cylinders arrive at the charging station with residual pressure from previous use or are filled with air and dried to a dewpoint of approximately 40 °F. Each cylinder shall be evacuated to a minimum absolute pressure of 3 inches of mercury and maintained for 2 minutes before filling begins. High purity gases (oxygen, helium, argon, and nitrogen) and other gases with purity levels above 99.95 percent shall be prepared for charging by double evacuation. ABO cylinders shall undergo three evacuation cycles, of 25 inches of mercury adjusted for altitude, in preparation for charging. Dried cylinders and cylinders with residual gas shall be evacuated to a minimum absolute pressure of 3 inches of mercury, pressurized with the gas of intended use to not less than 10 psig, and again evacuated to a minimum absolute pressure of 3 inches of mercury for 2 minutes before actual charging begins. Each cycle of evacuation will reduce any residual gas remaining in a cylinder to approximately
10 percent of its previous level. Each cylinder shall be charged with the applicable gas in accordance with the PID to a pressure level equivalent to the marked service pressure at 70 °F. Equivalent pressure/temperature tables will be found in the applicable commodity specification.
5.4.2 Charging cylinders with liquefied gases. Liquefied gases include LPG, fuel gas mixtures, fluorocarbon refrigerants, ammonia, chlorine, and sulfur hexafluoride. The cylinders for these gases are DOT 3-series seamless specification or DOT 4-series welded specification, as applicable for the particular gas and its maxium vapor pressure at 130 °F. Each service will provide specific control of the quality of the commodity contained. The cylinders for each service must be handled to preserve the properties of the commodity specification as applicable. The authorized weight and the nominal capacity presented in the PID for a cylinder in a specific liquefied gas service shall be equivalent values but shall never exceed the filling density in accordance with 49 CFR 173.304.
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