O-A-445C
3.2 Containers and valves. Unless otherwise specified herein, the ammonia shall be contained in government-furnished containers, capacity as specified (see 6.2 and 6.4), in accordance with
49 CFR 178 and equipped with valves with outlet connection No. 240 in accordance with
FED-STD-H28. When specified (see 6.2), new containers shall be furnished by the supplier, and shall be in accordance with MIL-DTL-11733, capacity as specified, and shall be equipped with valves in accordance with MIL-DTL-2. When specified (see 6.2), the ammonia shall be
furnished in supplier-owned Department of Transportation approved containers, capacity as specified.
3.3 Container maintenance. Government and supplier-furnished containers that require maintenance shall be processed by the supplier for serviceability to meet the requirements of this specification, 49 CFR 173, and CGA G-2 (see 6.7).
3.3.1 Residual pressure. Before refilling, each container shall be checked for residual pressure. A container with an open valve or with insufficient pressure to cause an audible hiss, when the valve is slightly opened, shall be devalved, cleaned, dried, and revalved to assure that the internal condition of the cylinder will preserve the properties of the ammonia. Containers with residual pressure shall be bled to zero pressure in the horizontal position with the diptube turned up and the base slightly elevated. Any cylinder that displays condensation or freezing of water vapor at the valve or within the valve outlet shall be devalved, cleaned, dried, and revalved before filling. When the cylinder bled to zero pressure is free of water, the valve shall be closed and the cylinder is acceptable for refilling with anhydrous ammonia.
3.3.2 Cylinder drying. Containers subjected to hydrostatic testing, aqueous cleaning, or to water from any source in usage, shall be dried until effluent gas has a dew point lower than 40 °F (4 °C). Drying may be accomplished by use of heated inert gas, evacuation of ambient air from the
bottom of the container submerged in a water bath at 180 °F (82 °C), or by forcing heated or dry air to the bottom of the cylinder. The cylinder shall be valved or plugged to retain the dry condition for refilling with ammonia.
3.3.3 Treatment and painting. Government-furnished containers for ammonia requiring repainting shall be stripped, treated, and painted as required in accordance with CGA TB-17. Each cylinder shall be color coded and marked in accordance with MIL-STD-101.
3.3.4 Valves. Unless otherwise specified (see 6.2), replacement valves for defective valves in government-furnished containers shall be supplier furnished and shall be in accordance with MIL-DTL-2.
3.3.5 Container filling. Containers with residual pressure approved for refill, shall be charged with anhydrous ammonia to their nominal weight. Cylinders that have been devalved, cleaned, dried, and revalved, shall be filled to nominal capacity and shall be immediately bled free of approximately 5 cubic feet of gases, purging the cylinder of the trapped atmospheric air. For anhydrous ammonia cylinder filling density, see 6.6.
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