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

5.4.4 Leakage test. Each cylinder that is charged with compressed gas in accordance with the contract or work order shall be inspected and tested for leakage. Testing shall be carried out by immersion in water or by use of a soap solution or an equivalent leak detection agent, except for ABO cyclinders (see 5.4.4.1). Cylinders with valves leaking at the seats or stems shall be tightened to establish leak free seals. Never loosen the bonnet nut or the packing nut of a charged cylinder valve. Cylinders with leaking valves or leaking valve inlet threads shall be relieved of internal pressure, inspected and scheduled for applicable maintenance. Cylinders with leaking inlet neck threads that are oversized (except for chlorine cylinders) shall be marked "condemned" and returned to the government agency for disposal.

5.4.4.1 Leak testing for ABO cylinders. Leak testing of charged ABO cylinders shall use a tube or outlet connected pig-tail with the extremity under a liquid to test for valve seat leakage without valve outlet contamination. ABO cylinder valve leak testing shall use leak detection compounds in accordance with MIL-PRF-25567.

5.4.5 Special tag for filled cylinders procured by the military medical services. A paper tag shall be attached to each filled cylinder. Marking shall include the name of the specified gas, serial number of the cylinder, and necessary precautionary markings. The statement, "CAUTION: Federal law prohibits dispensing without prescription", shall appear on the tag if it does not appear on the cylinder. Tags shall be furnished with metal eyelet and stringing wire. Wire shall be tinned, annealed, or galvanized. Tag colors shall be as follows:

Background - Same color as cylinders

Print - Black or

Background - White

Print - Same color as cylinders

In addition, the bottom of the tag shall be designed with a three-part legend, marked on both sides of the tag as follows:

"EMPTY" "IN USE" "FULL"

A perforation shall be placed between the words "FULL" and "IN USE" and between the words "IN USE" and "EMPTY" in order that these legends may be removed by tearing when they are no longer applicable.

The government will furnish DD Form 1191, Warning Tag for Medical Oxygen Equipment, for placement on oxygen cylinders.