This European Standard specifies minimum requirements concerning material, design, construction and workmanship, manufacturing processes and testing of refillable transportable welded stainless steel gas cylinders of water capacities from 0,5 l up to and including 150 l for compressed, liquefied and dissolved gases. This standard is only applicable to cylinders manufactured from stainless steels having a maximum tensile strength of less than 1 100 MPa. For acetylene service, additional requirements for the cylinder and the basic requirements for the porous mass are given in EN 1800. This standard is primarily for industrial gases other than LPG but may also be applied for LPG.