1. Receiving registration of gas cylinders 2. Inspection record original stamp 3. Remaining gas treatment 4. Unloading valve 5. Internal high pressure cleaning 6. Derusting inside and outside the cylinder 7. Visual inspection 8. Audio inspection 9. Bottle mouth thread and neck ring Inspection 10. Internal inspection 11. Weight measurement 12. Volume measurement 13. Water pressure test 14. Wall thickness measurement 15. Drying treatment 16. Bottling valve 17. Air tightness test 18. Gas cylinder surface painting 19. Spray writing, Stamp
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