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This International Standard specifes minimum requirements for the material, design, construction, workmanship, examination and testing at manufacture of refllable welded steel cylinders for the sub-atmospheric pressure storage of liquefed 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 test pressure not greater than 42 bar and a water capacity from 0,5 l up to and including 12 l exposed to ambient temperatures for the purpose of facilitating the sub-atmospheric pressure storage of liquefed and compressed gases. Inspection at the time of fll is specifed in Annex A and periodic inspection and testing is specifed in Annex B.High-pressure and low-pressure liquefed gases as specifed in Annex C can be suitably flled into these cylinders. The flling pressure will be less than one bar gauge at 21 °C.