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

CONTENTS

PARAGRAPH                                                                                                                      PAGE

5.2.2                External inspection .......................................................................................20

5.2.2.1             Paint inspection.............................................................................................20

5.2.2.2             Valve protection cap inspection....................................................................21

5.2.3                Valves and PRDs ..........................................................................................21

5.2.3.1             PRDs .............................................................................................................21

5.2.3.1.1          PRD CG-1 (rupture disk)..............................................................................21

5.2.3.1.2          PRD CG-2 and CG-3 (fusible plug)..............................................................21

5.2.3.1.3          PRD CG-4 and CG-5 (combination rupture disk-fusible plug)....................21

5.2.3.1.4          PRD CG-7 (spring loaded, reseating PRD) ..................................................22

5.2.4                Inspection of flanges.....................................................................................22

5.2.5                Inspection of footrings ..................................................................................22

5.2.6                Periodic test date inspection .........................................................................22

5.2.6.1             Hydrostatic testing or UE .............................................................................23

5.2.6.2             External visual inspection.............................................................................24

5.2.7                General internal cylinder evaluation.............................................................24

5.2.7.1             Hammer test..................................................................................................24

5.2.7.2             Odor test........................................................................................................24

5.2.7.2.1          Odor test procedure.......................................................................................25

5.2.7.2.2          Classification of odor....................................................................................25

5.2.7.2.3          Odor detection personnel ..............................................................................25

5.2.8                Sulfur hexafluoride cylinder internal inspection ..........................................25

5.2.9                Chlorine cylinder internal inspection............................................................26

5.2.10              Rejection and condemnation.........................................................................26

5.2.11              Recording of required services at serviceability inspection .........................26

5.3                   Cylinder maintenance ...................................................................................26

5.3.1                Periodic testing .............................................................................................27

5.3.1.1             Hydrostatic test and UE ................................................................................27

5.3.1.1.1          Special filling limit test.................................................................................27

5.3.1.1.2          Ten-year periodic test  ..................................................................................28

5.3.1.2             External visual inspection.............................................................................28

5.3.2                General cylinder maintenance ......................................................................29

5.3.2.1             Neck threads cleaning...................................................................................29

5.3.2.2             Droplight testing ...........................................................................................29

5.3.2.2.1          Light source ..................................................................................................29

5.3.2.2.2          Test procedure...............................................................................................29

5.3.2.2.3          Inspection of blind area.................................................................................29

5.3.2.2.4          Interpretation of visual inspection ................................................................30

5.3.2.3             Cylinder structural maintenance ...................................................................30

5.3.2.3.1          Government cylinders DOT 3A and DOT 3AA...........................................30

5.3.2.3.2          Government cylinders DOT 4 and DOT 8....................................................30

5.3.2.3.3          Heat treatment of cylinders...........................................................................30

5.3.2.4             Internal cylinder surface cleaning.................................................................31

5.3.2.4.1          Aqueous solution detergent washing ............................................................31

vi