Metal hoses for use in pressure, in accordance with the PED Classification, do not constitute a special type of hoses, but discriminate depending on: the type of fluid conveyed (danger), the hose size (mass of fluid contained) and the operating pressure, the adoption or not of additional specific certifications and rules about the quality of the material used for the hose, the compilation (made by the producer) of the processing documents containing identity and qualification of the operators who have performed significant works at the hose (for example welding) and, as for the use, certificated periodic inspections of the article (for example: detecting corrosion) in accordance with the implementing regulations.
The PED governs the design, construction, equipping and safety installation of pressure instruments. The steel tubing for these applications is fully assimilated to a “system under pressure” as a boiler or a pressurized tank. The law application provides for different levels (Categories or Classes) of certification according to the conveyed fluid, the diameter, and the pressure. The legislation also determines the conditions that are not subjected to its application (unclassified tubing).