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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53

MIL-STD-1411B

5.2.9 Chlorine cylinder internal inspection. Each chlorine cylinder shall be bled to zero pressure (0 psig) in accordance with environmental requirements and shall have its valve removed (see 5.3.2.1). It shall then be internally inspected. Before charging, the cylinder shall be subjected to internal inspection by droplight test to assure that corrosion has not damaged the integrity of the cylinder wall, bottom, or its neck inlet threads (see 5.3.2.2). Before charging, the chlorine cylinder shall be subjected to a hammer test. Cylinders with corroded sidewalls, cylinders with eroded female neck threads, and cylinders with a dull response or unusual sound

at hammer testing shall be rejected and scheduled for applicable maintenance. Cylinders rejected for general internal corrosion shall pass hydrostatic testing or UE when permitted, after corrosion products have been removed and before returning to regular gas service.

5.2.10 Rejection and condemnation. At serviceability inspection each cylinder received will have been examined for charging, maintenance, and repair, or for storage in accordance with the PID. Cylinders shall be accepted for service with a specified gas commodity application when the integrity of the cylinder is assured to be in accordance with the applicable DOT specification and the cylinder is assured to maintain the purity level of the gas of specified use. Cylinders not acceptable by this standard shall be processed for applicable maintenance to

restore acceptability in accordance with the PID. Cylinders that cannot be restored by approved maintenance procedures shall be condemned and returned to the government agency. Unrepairable valves are government property and shall be returned to the government agency.

5.2.11 Recording of required services at serviceability inspection. Serviceability inspection requires the listing of the number of cylinders inspected on the DD Form 250 indicating acceptance, rejection, and required maintenance. The DD Form 250 shall identify all involved activities affected in transporting cylinders requiring maintenance.

5.3 Cylinder maintenance. Cylinders received and found to be deficient at inspection or at charging shall be scheduled for necessary maintenance before returning to compressed gas service. A record of maintenance shall be kept current on the DD Form 250. After scheduled maintenance has been performed, the cylinder shall pass inspection in accordance with 5.1 and

5.2 of this standard. Cylinders should be grouped as follows:

a. Periodic testing.

(1) Cylinders requiring hydrostatic testing or UE.

(2) Cylinders requiring external visual examination. b. General cylinder maintenance.

c. General acetylene cylinder maintenance. d. Chlorine cylinders.

e. Cylinders requiring special handling.