RR-C-901E
3.6 Cylinder identification. Unless otherwise specified herein, markings shall be in characters not less than 0.25 inch (6.350 millimeters (mm)) high. On cylinders 6 inches (152.4 mm) in outside diameter or larger, the markings shall be in characters 0.375 inch (9.525 mm) high.
3.6.1 Standard permanent markings. The standard permanent markings as required by the appropriate DOT specification shall be plainly and permanently marked by stamping into the shoulder or the neck of each cylinder.
3.6.2 Additional special permanent markings. The following permanent markings shall be stamped into the shoulder or neck of the cylinder as they are specified or as they apply to the cylinder being manufactured or its dedicated application:
3.6.2.1 Ownership markings. All cylinders being purchased by a U.S. Government agency shall be stamped with "US GOVT" to indicate government ownership. Cylinders four inches or greater in diameter shall be marked with 0.375-inch (9.525 mm) characters. Cylinders less than four inches in diameter shall be stamped with 0.25-inch (6.350 mm) characters. The symbols shall be stamped directly below or offset 90 degrees from the DOT permanent markings.
3.6.2.2 Tare weight. All cylinders being used in liquefied gas application shall have the tare weight applied to the cylinder (see 3.4).
3.6.2.3 Impact resistance. All cylinders tested and designated impact resistant shall have the designation of "-50 °C" applied to the cylinder.
3.6.2.4 Shatterproof. All cylinders meeting the shatterproof characteristics of this specification shall be stamped "NONSHAT".
3.6.3 Special markings. The following special markings shall be applied as specified in the acquisition order (see 6.2) when required:
3.6.3.1 Special cylinder applications. When specified, cylinders designated for aviators breathing oxygen (ABO), nitrogen, and compressed air used in aircraft servicing shall be stenciled with the equivalent service pressure in kilopascals.
3.6.3.2 Specific gas applications. All cylinders that have been designated for a specific gas application shall be color-coded and stenciled in accordance with MIL-STD-101.
3.6.3.3 Medical gas cylinders. All government medical cylinders, both government-owned and vender-owned, shall be color-coded and stenciled in accordance with MIL-STD-101. All materials provided in the cylinder package shall pass the applicable tests specified in
NASA-STD-6001.
3.6.3.3.1 Medical services tag. A military medical services tag shall be used on filled medical cylinders when they are purchased as part of a medical gas commodity contract. The tag shall be attached to each cylinder and the markings shall include the national stock number, the name of the specified gas, cylinder size, cylinder capacity in gallons, lot number, contract number, cylinder serial number, contractor's name or registered trademark, and necessary precautionary
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