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ČSN EN 15001-2 (38 6420) This document specifies detailed functional requirements for the commissioning, operation and maintenance of - industrial gas installation pipework and assemblies with an operating pressure greater than 0,5 bar; and - non-industrial gas installation pipework (residential and commercial) with an operating pressure greater than 5 bar in buildings, starting from the outlet of the network operator's point of delivery up to the inlet connection to the gas appliance; normally the inlet isolation valve. This document also covers the pipework to the inlet connection of a gas appliance that is not included within the scope of the appliance standard. Apart from the exceptions stated below, this document applies to gas installation pipework operating at ambient temperatures between -20 °C and 40 °C and operating pressures up to and including 60 bar. For operating conditions outside these limitations, reference is additionally be made to EN 13480 for metallic pipework. For industrial gas installation pipework up to and including 0,5 bar and for non-industrial (residential and commercial) gas installation pipework up to and including 5 bar EN 1775 applies. For gas installation pipework that do not fall within the scope of EN 1775 or other European Standards, this European Standard applies. In this document, the term "gas" refers to combustible gases, which are gaseous at 15 °C and 1 013 mbar absolute atmospheric pressure. These gases are commonly referred to as manufactured gas, natural gas or Liquefied Petroleum Gas (LPG). They are also referred to as first, second or third family gases as classified in EN 437:2021, Table 1 The given values are considered as normal conditions for all volumes given in this document. This document is applicable to gas installation pipework for the carriage of: - processed, non-toxic and non-corrosive natural gas according to EN 437:2021 and EN 16726 "Gas infrastructure - Quality of gas - Group H"; - biomethane, complying with EN 16723-1; - vaporized LNG. NOTE - The specification of vaporized LNG is equal to that of natural gas as classified in EN 437:2021. This document does not cover pipework for hydrogen rich gases that fall outside the definitions within EN 437:2021. LPG storage vessels (including all ancillaries fitted directly to storage vessels) are excluded. Also excluded are LPG installations and sections of LPG installations operating at vapour pressure or in the liquid state. In this document, all pressures are gauge pressures unless otherwise stated. This document specifies common basic principles for gas supply systems. Users of this document should be aware that more detailed national standards and/or code of practice may exist in the CEN member countries. This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles. For gas installation pipework within the scope of this document, national legislation and regulations are meant to be taken into account. Functional requirements for design, selection of materials, construction, inspection and testing of industrial gas installation- pipework with an operating pressure greater than 0,5 bar and of gas installation pipework greater than 5 bar in buildings and areas intended for non-industrial installation pipework are described in EN 15001-1:2023.