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

CONTENTS

PARAGRAPH                                                                                                                      PAGE

5.3.2.4.1.1       Procedure ......................................................................................................31

5.3.2.4.1.2       Alternate procedure.......................................................................................32

5.3.2.4.2          Organic solvent washing...............................................................................32

5.3.2.4.3          Vapor degreasing of cylinders ......................................................................33

5.3.2.4.3.1       Procedure for vapor degreasing ....................................................................33

5.3.2.4.4          Mechanical cylinder cleaning .......................................................................33

5.3.2.4.4.1       Shot blast.......................................................................................................33

5.3.2.4.4.2       Rolling iron abrasives ...................................................................................34

5.3.2.4.4.3       Mandrel and chain ........................................................................................34

5.3.2.4.5          Heat treatment cleaning ................................................................................34

5.3.2.4.5.1       Procedure ......................................................................................................34

5.3.2.5             Internal cylinder drying ................................................................................35

5.3.2.5.1          Ambient air drying........................................................................................35

5.3.2.5.2          Hot nitrogen gas drying ................................................................................35

5.3.2.5.3          Vacuum and heat drying ...............................................................................35

5.3.2.6             Valves and PRDs ..........................................................................................35

5.3.2.6.1          Valve maintenance........................................................................................35

5.3.2.6.1.1       Handwheels, packing glands, bonnet nuts, and valve seats..........................35

5.3.2.6.1.2       Valve inlet and outlet connections................................................................36

5.3.2.6.1.3       Valve outlet caps and plugs ..........................................................................36

5.3.2.6.2          PRDs .............................................................................................................36

5.3.2.6.3          Valve installation ..........................................................................................36

5.3.2.6.4          Valve replacement and disposal ...................................................................37

5.3.2.6.5          Cylinder plugs in lieu of valve......................................................................37

5.3.3                General maintenance of acetylene cylinders ................................................37

5.3.3.1             Acetone adjustment.......................................................................................37

5.3.4                Chlorine cylinder maintenance .....................................................................38

5.3.5                Special handling............................................................................................38

5.3.6                External cylinder surface maintenance .........................................................39

5.3.6.1             Cylinder valve protection caps .....................................................................39

5.3.6.2             Paint, decal, and rust removal.......................................................................39

5.3.6.2.1          Release of compressed gas in 150 °F stripping solution ..............................39

5.3.6.2.2          Caustic stripping ...........................................................................................40

5.3.6.2.3          Water rinsing of caustic solutions.................................................................40

5.3.6.3             Metal surface pretreatment ...........................................................................40

5.3.6.4             Prime coating ................................................................................................40

5.3.6.5             Finish coating................................................................................................41

5.3.6.6             Touch-up painting.........................................................................................41

5.4                   Cylinder charging .........................................................................................41

5.4.1                Charging cylinders with permanent gas (oxygen, nitrogen, hydrogen,

argon, helium, air, and carbon monoxide) ....................................................41

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