ISO 9809-4:2014 specifies the minimum requirements for the material, design, construction and workmanship, manufacturing processes, examinations, and tests at manufacture of refillable seamless stainless steel gas cylinders of water capacities from 0,5 l up to and including 150 l for compressed, liquefied, and dissolved gases. ISO 9809-4:2014 is applicable to cylinders with a maximum actual tensile strength, Rma, of less than 1 100 MPa.