MIL-STD-1411B
5.4.2.1 Charging ammonia cylinders. At a charging station, ammonia cylinders will contain slightly more than one atmosphere of ammonia gas pressure or one atmosphere of dry ambient air when the cylinder is new or requires maintenance. Ammonia may be filled to a density not greater than 54 percent of the cylinder water capacity by weight at 60 °F. Cylinders with residual ammonia gas and cylinders filled with ambient air can be handled together. Check and record the marked tare weight. Attach the ammonia cylinder to the ammonia recharging line and allow the pressure head to flow liquefied ammonia into the cylinder to the authorized weight of the cylinder. Close the valve and disconnect the recharging line. If the cylinder is filled over the authorized weight, bleed the excess liquefied ammonia as gas to the net product weight. Record the quantity of ammonia filled. Charged anhydrous ammonia cylinders that contain one atmosphere of dry ambient air shall be adjusted by the escape of not less than 5 cubic feet of gas to assure the preferential release of most of the trapped air.
5.4.2.2 Charging chlorine cylinders. At a charging station, chlorine cylinders will contain approximately one atmosphere of dry air or nitrogen. Place the chlorine cylinder on a manifold capable of drawing a vacuum and introducing a pressure head of liquid chlorine without exposure to ambient air. The chlorine cylinder shall first be evacuated to 3 inches of mercury. After gate valves are switched to the liquefied chlorine head, the cylinder shall be slowly filled. A chlorine container is approved for a filling density of 125 percent times the container's water capacity by weight. Record the tare weight and fill the cylinder to its authorized weight. If the cylinder is filled over the authorized weight, adjust the chlorine for net product weight of the cylinder. Record the quantity of chlorine filled.
5.4.2.3 Charging fluorocarbon refrigerant cylinders. At a charging station, government fluorocarbon refrigerant cylinders will have been subjected to an internal inspection and necessary maintenance, followed by drying to a dewpoint not greater than 40 °F with ambient air. Each fluorocarbon refrigerant cylinder shall be charged to a filling density not greater than that specified in 49 CFR 173.304 multiplied by the water capacity of the cylinder for its authorized weight. The cylinder shall be weighed to determine its specific tare weight and recorded. Before charging, the cylinder shall be evacuated to 3 inches of mercury, and without access of ambient air the cylinder shall be charged to the authorized weight with a specific refrigerant. At a final weighing, the contents of the cylinder shall be adjusted for net product weight for the cylinder as applicable.
5.4.2.4 Charging cylinders with LPG. At a charging station, a LPG cylinder will be empty and will have the same weight as its tare weight, or it will contain liquefied gas and its base weight will be somewhat heavier than its marked tare weight. Record the base weight of each LPG cylinder to be recharged. LPG cylinders may be filled to a density not greater than 42 percent of the cylinder water capacity by weight at 60 °F. Connect the valve outlet to the LPG charging line and fill the cylinder. Cylinders filled with air will block filling at some point short of being full, as the pressure of the compressed air reaches the recharging head pressure. To prevent pressure block, the cylinder valve outlet connection must be cracked periodically during recharging to allow the trapped air to escape. Government LPG cylinders are made to contain the authorized weight as specified in the item description. A cylinder shall be charged to its authorized weight. The base weight recorded for the specific cylinder shall be subtracted from the gross weight and recorded as the net product weight of LPG required for recharging.
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