For such a piping the maximum DN used for that item of pressure equipment shall be the basis for the classification. The manufacturer shall show the extent of piping for that item in the technical documentation.
Note:
The term a “piping” as used above means an item of pressure equipment, and not an “assembly” as defined in Article 2 (6).
A completed assembly may consist of several items of piping which may have different categories under the PED. The requirements for the global conformity assessment of assemblies are contained in Article 14.