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

5.1.3 Color code, paint, and stenciling. The cylinders shall be inspected for proper color coding and stenciling in accordance with MIL-STD-101 as specified in the PID. Cylinders with improper color, peeling paint, or improper or illegible stenciling shall be scheduled for external maintenance.

5.1.4 Cylinder valve protection cap. Each cylinder designed for a protection cap shall be inspected for the presence of a valve protection cap that will run free on its threads and be free of cracks or dents. Cylinders lacking caps or with damaged caps shall have them replaced or scheduled for necessary maintenance. Cylinders with a capacity of less than 625 cubic inches do not require a valve protection cap in government service except for medical gas applications.

5.1.5 Cylinder valves. Each cylinder shall be inspected for a functional valve threaded into its neck threads. Broken valves or obviously nonfunctional valves shall be scheduled for replacement at maintenance.

5.1.6 Change in service. When specified in the contract, cylinders at receiving inspection that have an acceptable DOT specification and service pressure in accordance with the requirements of the PID, but in a different noncorrosive gas service, shall be scheduled for change of service procedures.

5.1.7 Damaged cylinders. Cylinders shall be inspected for bent or worn footrings in low pressure applications and for loose flanges in DOT 3A or DOT 3AA applications. These types

of defects shall be scheduled for maintenance in general metal working shops where the pressure bearing portion of the cylinder is not subject to the heat of welding activity. Repair work requiring independent welds of less than three inches or rebuild work requiring welds greater than three inches in length on the pressurized portion of the cylinder shall be scheduled for maintenance in shops with proper Associate Administrator for Hazardous Materials Safety authorization. Cylinders showing evidence of being subjected to fire shall be condemned and returned to the government agency for disposal. When proper repair, rebuild, or remanufacture

is not available, a cylinder requiring such maintenance shall be rejected and returned to the government agency.

5.1.8 Foreign cylinders. Foreign made cylinders are acceptable only if the cylinders are manufactured to DOT specifications and all recorded data required by the specification is available upon request. A DOT assigned manufacturer's code shall be steel stamped into the shoulder of the cylinder.

5.1.9 Substandard cylinders. Cylinders that are listed by government agencies or in industrial publications declaring them in nonconformance to 49 CFR shall be rejected, marked "condemned", and returned to the government agency for disposition.

5.1.10 Recording of services at receiving inspection. Receiving inspection should include the number of cylinders received on a DD Form 250 indicating acceptance or rejection.