Gas cylinders. Refillable welded steel cylinders containing materials for sub-atmospheric gas packaging (excluding acetylene). Design, construction, testing, use and periodic inspection1 Scope This document specifies minimum requirements for the material, design, construction, workmanship, examination and testing at manufacture of refillable welded steel cylinders for the sub atmospheric pressure storage of liquefied and compressed gases. It only applies to the cylinders themselves, irrespective of the materials contained therein (e. g. adsorbents, media, materials and or gases) and other related applications. The cylinders have a

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