RR-C-901E
3.8 Intended gas service. The intended gas service shall be selected from table I. Cylinder compatibility with the intended gas or liquid contents shall comply with the requirements of
49 CFR 173, subpart G.
3.9 Physical characteristics. The cylinder service (operating) pressure and its physical characteristics shall be selected from tables II or III. The dimensional tolerances shall be
±0.25 inch for the diameter and ±1.00 inch for the height.
3.10 Components. Each industrial gas cylinder with capacity of 625 cubic inches or greater and all medical cylinders with a capacity of 300 cubic inches or greater shall be fitted with a neck flange in accordance with MIL-DTL-17376/3 with a mating valve protection cap in accordance with MIL-DTL-17376/1. Fire extinguisher and industrial gas cylinders with a capacity less than
625 cubic inches, and "D" and "E" size medical cylinders (size codes BP and BQ) shall be supplied without caps and flanges.
3.10.1 Neck flange. The cylinder neck flange shall be pressed on or peened tight around the neck and onto the shoulder of the cylinder. It shall be visibly free of defects (cracks, pits, scale, etc.) or foreign materials (sand, flux, etc.). The flange threads shall be clean cut and free of any damage.
3.10.2 Valve protection cap. The cylinder neck flange shall mate with a valve protection cap of the size and thread designated in MIL-DTL-17376/1. The cap shall turn smoothly and freely on its threads to full thread engagement. The cap shall be free of any cracks or dents and shall be painted the same color and with the same quality as the shoulder of the cylinder.
3.10.3 Pressure relief device. The cylinder and valve assembly shall be furnished with a
pressure relief device that is rated for the service pressure of the cylinder, and as stipulated in the designated valve specification. All pressure relief devices shall be selected and tested in accordance with CGA S-1.1 as required by 49 CFR 173.34.
3.10.4 Closure (valve or plug). The cylinder shall be furnished with a designated valve in accordance with A-A-59860 (see table IV) when specified. The valve shall meet the requirements of A-A-59860 as referenced by the part or identifying number (PIN). Unless otherwise specified (see 6.2), the inlet thread size of the valve shall be as specified in tables II or III herein. When a valve is not designated, the cylinder shall be closed with a brass plug (with hex wrenching flats) and Teflon tape to afford proper sealing and easy removal.
3.10.4.1 Medical service cylinders. All cylinders fabricated for medical services shall be supplied with a medical valve as specified. Each medical cylinder shall be equipped with a flange and a valve protection cap unless otherwise specified.
3.11 Workmanship. Cylinders, valves, plugs, flanges, and caps shall be cleaned and free from grit, fins, pits, and loose scale. Edges shall be rounded and chamfered. Cylinders shall be cleaned and free of dents, scratches, and any other surface defects detrimental to the intended use.
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