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

5.1.1.4 Government ownership. The cylinder shall be inspected for markings denoting government ownership. Markings identifying government ownership are as follows:

U.S. Government, U.S. Property, WD, AF DA, USA, USN, N, US, or the name of a DoD or other government agency impressed into the shoulder of the cylinder or embossed on the neck ring. A military or federal specification number impressed into the shoulder of the cylinder will also establish government ownership. Cylinders not identified as U.S. Government property shall be returned to their point of origin for proper disposition.

5.1.1.5 Nonshatterability (NONSHAT). When nonshatterability is specified, each cylinder shall be inspected for identification markings or fabrication assuring the nonshatterable properties of the steel used to make the vessel (see 3.22). Nonshatterable properties shall be assured when

the following markings are established:

a. Permanent marking: NONSHAT, SHATTERPROOF, or NONSHATTERABLE. b. Cylinders with the following permanent specification markings: SPS 843 (INT),

(SPS 1022 INT), 51-C-26 (INT), 51-C-41 (INT), 51-C-26, or 51-C-27. In addition, cylinders dated after June 1944 and stamped 51-C-31 or 51-C-31 (INT).

c. Any cylinder fabricated to DOT specification 3AA from ASA 4130X steel fabricated in accordance with 3.22 shall be considered nonshatterable.

NOTE: Cylinders that are found to be nonshatterable by these guidelines, but not permanently marked as in (a) above, shall be scheduled for marking "NONSHAT" by stamping or etching with a template. Letters shall be not less than 3/8 inch high and deep enough to be legible through the finish coat of paint.

5.1.1.6 Tare weight. Each cylinder used in liquefied gas service shall be weighed before each charging. Cylinders without permanently marked tare weights shall be scheduled for weighing and marking at maintenance.

5.1.1.7 Water capacity. Water capacity is an optional marking on government-owned cylinders (see 3.32).

5.1.1.8 Periodic test status. Cylinders in government service shall be inspected for valid or expired periodic test dates. Cylinders in noncorrosive liquefied gas service may qualify for external visual examination in lieu of hydrostatic testing or UE. Cylinders with expired test dates shall be scheduled for testing or examination as applicable. Test dates followed with a star indicate that a specific cylinder is in a specific service on a ten-year rather than on a five-year retest program. Test dates followed with a "+" sign have been approved for special filling limits

10 percent above the marked service pressure.

5.1.2 Dimensions. Government-owned cylinders shall be inspected for cylinder dimensions or capacity in accordance with the PID. Cylinders rejected for excessive variation with the PID shall be reported to the government agency from which they originated.