This European Standard specifies the requirements for material@ design@ manufacturing@ testing and documentation for stationary piping intended for use in refrigerating systems@ heat pumps and secondary cooling and heating systems. These refrigerating systems and heat pump systems are referenced in this standard as refrigerating systems as defined in EN 378-1. This European Standard applies to piping@ including welded or brazed attachments up to and including the flanges@ screwed@ welded or brazed connectors@ or to the edge to be welded or brazed at the first circumferential joint connecting piping or other elements. This European Standard applies to the selection@ application and installation of safety accessories intended to protect the piping during the various phases of the refrigeration cycle. This European Standard applies to the following piping: ?? heat exchanger consisting of piping for the purpose of cooling or heating air where piping aspects are predominant; ?? piping incorporated into an assembly (e.g. self-contained system@ condensing unit); ?? field erected piping. This European Standard applies to piping with an internal pressure down to ?C 1 bar@ to account for the evacuation of the piping prior to charging with refrigerant. This European Standard applies to both the mechanical loading conditions and thermal conditions as defined in EN 13480-3 associated with refrigerating systems. It applies to piping subject to the maximum allowable temperatures for which nominal design stresses for materials are derived using prEN 14276-1 or as specified in this European Standard. In addition piping designed to this standard needs to have a maximum design temperature not exceeding 150 ??and a maximum design pressure not exceeding 160 bar. Outside of these limits@ EN 13480 should be used for the design construction and inspection of the piping. Under these circumstances@ the unique nature of a refrigerating plant@ as indicated in the introduction of prEN 14276-1@ needs also to be taken into account. This European Standard applies to piping where the main pressure bearing parts are manufactured from metallic ductile materials as defined in Clause 4 and in prEN 14276-1.