1.1This European Standard specifies the requirements for materials, design, manufacture, testing inspection, safety systems and documentation (including instructions for first operation), for commonly-used types of gas-loaded accumulators and gas bottles for fluid power applications (see 1.2). 1.2This European Standard applies to the following types of components, defined as the pressure-containing envelope of gas-loaded accumulators: - bladder type;- diaphragm type; - piston type; - transfer type; - gas bottlesused to provide additional gas capacity.They consist of one or several parts joined together by a variety of mechanical means and by welding.1.3This European Standard applies to gas-loaded accumulators which operate with the following conditions: - subject to an internal gauge pressure greater than 0,5 bar; - working temperature of not lower than –50 °C and not higher than +200 °C; - containing Group 2 liquids and gases as defined in the Pressure Equipment Directive 97/23/EC. It does not apply to: - accumulators for use with dangerous fluids (see NOTE 1). NOTE 1 Fluid power applications utilize non-dangerous fluids as categorized in ISO 6743-4 in addition to an inert gas (e.g. nitrogen) which is used as the pre-charging medium. NOTE 2 There are no design limits to the volume of the accumulator.