This International Standard specifies the characteristics and requirements for components such as pipes, fittings and valves made from one of the following materials intended to be used for thermoplastics piping systems in the field of industrial applications above and below ground: — unplasticized polyamide (PA-U) NOTE 1 Requirements for industrial valves are given in this International Standard and/or in other standards. Valves are to be used with components conforming to this International Standard provided that they conform additionally to the relevant requirements of this International Standard. This International Standard is applicable to either PA-U pipes, fittings, valves, and their joints and to joints with components of other plastics and non-plastic materials, depending on their suitability, intended to be used for the conveyance of liquid and gaseous fluids as well as solid matter in fluids for industrial applications such as the following: — oil and gas industry (general purpose hydrocarbon-based fluids) — industrial sewerage engineering (e.g. sewer contaminated with hydrocarbons); — transport of CO2 (carbon capture and utilisation or storage (CCUS)) NOTE 2 Where relevant, national regulations are applicable. Other application areas are permitted if the requirements of this International Standard and/or applicable national requirements are fulfilled. National regulations in respect of fire behaviour and explosion risk are applicable. The components have to withstand the mechanical, thermal, and chemical demands to be expected and have to be resistant to the fluids to be conveyed. Characteristics and requirements which are applicable for PA-U are covered by the relevant clauses of this International Standard. Those characteristics and requirements which are dependent on the material are given in the relevant normative annex A. Components conforming to any of the product standards listed in the bibliography or with national standards, as applicable, may be used with components conforming to this International Standard, provided that they conform to the requirements for joint dimensions and to the relevant requirements of this International Standard.