Foreword<br>Introduction<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Written scheme of inspection<br>5 Procedures for periodic inspection<br>&nbsp;&nbsp;5.1 General<br>&nbsp;&nbsp;5.2 External visual inspection<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.2.1 Preparation <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.2.2 Inspection procedure <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.2.3 Visible defects<br>&nbsp;&nbsp;5.3 Internal visual inspection<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.3.1 General<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.3.2 Preparation of cylinders<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.3.3 Procedure <br>&nbsp;&nbsp;5.4 Additional inspection/test procedures<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.4.1 General: preparation of cylinders <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.4.2 Hydraulic proof pressure test<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.4.3 Pneumatic proof test and leak test <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.4.4 Pneumatic leak test <br>6 Inspection of cylinder threads<br>&nbsp;&nbsp;6.1 Threads<br>&nbsp;&nbsp;6.2 Internal threads<br>&nbsp;&nbsp;6.3 External threads<br>&nbsp;&nbsp;6.4 Damaged threads<br>7 Final operations<br>&nbsp;&nbsp;7.1 Drying<br>&nbsp;&nbsp;7.2 Valving<br>&nbsp;&nbsp;7.3 Tare weight<br>&nbsp;&nbsp;7.4 Marking<br>&nbsp;&nbsp;7.5 Purging<br>8 Records<br>9 Rendering cylinders unserviceable<br>Annex A (normative) Requirements for 10-year periodic<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;inspection interval<br>Annex B (informative) Examples of acceptance/rejection criteria<br>Bibliography