scope:

This European Standard specifies the requirements for materials, design, manufacture, testing, inspection, safety systems and documentation for commonly used types of gas-loaded accumulators for fluid power applications up to being placed on the market. It includes interconnected pressure vessels or 'gas bottles' used to provide additional gas capacity and communicating with the gas chamber of the accumulator by means of a pipe connection. This European Standard applies to the following components, defined as the pressure containing envelope of gas-loaded accumulators. They consist of one or several parts joined together by a variety of mechanical means including welding: a) Bladder type: pressure retaining shell, either spun-forged from seamless tube, hammer-forged from hollow bar or of welded construction b) Diaphragm type: pressure retaining shell assembly with integral ports. The construction may either be screwed or welded c) Piston type: cylinder body and end cap assemblies d) Gas bottles: body and depending upon construction, port assemblies. This European Standard applies to gas-loaded accumulators which operate with the following conditions: a) subject to an internal gauge pressure greater than 0.5 bar; b) the working temperature is not lower than -50 °C and not higher than +200 °C; c) containing Group 2 liquids and gases