Keywords: Flexible pipes; Pipes; Pipe fittings; Corrugated; Electric wires; Electric cables; Protected electrical equipment; Electrical safety; Explosive atmospheres; Designations; Copper alloys ; Austenitic steels; Stainless steels; Steels ; Welding; Dimensions; Bending; Radius; Condition of goods; Inspection; Hydraulic tests; Test pressure; Marking; Instructions for use; Type approval; Approval testing; Bend testing; Testing conditions; Fatigue testing