MIL-STD-1411 Inspection And Maintenance Of Compressed Gas CylindersThis standard defines the requirements and procedures for the inspection, maintenance, and charging of government-owned cylinders by gas suppliers. This standard is intended to assure that the cylinders are serviced to meet safety standards and to assure that the quality of the gas supplied is not degraded by a government container. This standard is also applicable to cylinders that require reconditioning, repair, and rebuilding to assure a level of renewal that meets the needs of the government and industry in gas handling. This standard is also to be a guide when cylinders are sorted, graded, and classified for storage, salvage, or disposal in depot facilities.

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MIL-STD-1411B

e. Occasionally a cylinder will be unidentifiable and filled with gas. Caution must be used as the gas may be flammable or toxic to personnel. These cylinders shall be rejected or condemned and returned to the government for disposal.

4.1.2 Serviceability inspection. Each cylinder accepted at receiving inspection shall be inspected for serviceability in reference to the PID, the applicable DOT regulations, the assigned gas service, and as specified herein (see table II). Accepted cylinders shall be forwarded for charging. Cylinders not meeting inspection levels shall be scheduled for proper maintenance in accordance with 5.3. Records of scheduled maintenance shall be made on DD Form 250 or similar tabulation. For detailed serviceability requirements, see 5.2.

4.1.2.1 Rejection and condemnation. Cylinders that are unacceptable at serviceability inspection shall be tagged for proper maintenance. These cylinders shall meet serviceability standards before being forwarded for recharging. Cylinders that cannot be upgraded by maintenance shall be rejected, tagged, and returned to the government. Any cylinder found to require condemnation by standards presented in 4.1.1.1 shall be metal stamped "condemned" with justification and shall be returned to the government for disposal.

4.1.3 Maintenance. Cylinders that have been scheduled for maintenance procedures

shall be serviced in accordance with 49 CFR and as specified herein. Heat treatment, repair, and rebuilding of cylinders shall only be performed by facilities approved by the Office of Hazardous Materials Safety, as applicable. After maintenance, each cylinder shall pass the applicable detailed serviceability requirements of section 5 before returning to compressed gas service. For detailed maintenance requirements, see 5.3.

4.1.3.1 Rejected and condemned cylinders. Any cylinder that cannot be reconditioned to meet the serviceability standards of 5.2 shall be rejected at maintenance, tagged for repair or rebuild, or metal stamped "condemned", and returned to the government for proper disposition.

4.1.4 Cylinder charging. Each cylinder shall be evacuated before charging except for acetylene, LPGs, and other fuel gas mixtures. For these services, the weight of residual gas is retained and becomes a part of the functional base weight for determining the weight of gas required for charging. Charging shall follow immediately after evacuating or purging without opening the manifold to atmospheric air to control possible contamination of the specified gas commodity. Cylinder charging shall be handled in accordance with 5.4.

4.1.4.1 Rejection and condemnation. Any cylinder that leaks at the inlet threads or through a damaged valve body shall have its gas pressure exhausted and be returned to maintenance for necessary repair. Any valve leak that can be sealed by normal tightening of the stem seal or packing gland shall be acceptable for charging. Any cylinder, except for chlorine service (see 5.3.4), with oversized neck threads causing leakage with a standard valve shall be rejected and condemned. Cylinders that display any instability of structure such as bulging or leakage in any way shall be exhausted, rejected, metal stamped "condemned", and returned to the government for disposal.