This European Standard describes the general functional recommendations for pipelines up to the point of delivery, and also for buried sections of pipework after the point of delivery, for maximum operating pressures up to and including 16 bar for gaseous fuels in accordance with Table 1 of EN 437:1993. It applies to their design, construction, commissioning, decommissioning, operation, maintenance, renovation, extension and other associated works. This European Standard does not apply to the materials, design, construction, testing and commissioning of gas supply systems in use prior to the publication of this standard. However, this European Standard does apply to the operation, maintenance, renovation and extension of all gas supply systems. Specific functional recommendations for polyethylene pipelines are given in prEN 12007-2, for steel pipelines in EN 12007-3 and for the renovation of pipelines in prEN 12007-4. Functional recommendations for pipework for buildings are given in EN 1775. Functional requirements for pressure testing, commissioning and decommissioning are given in prEN 12327. Functional requirements for measuring systems are given in EN 1776. Functional requirements for pressure regulating stations are given in EN 12186. Functional requirements for pressure regulating installations are given in EN 12279. Functional requirements for gas transmission are given in EN 1594. This European Standard specifies common basic principles for gas supply systems. Users of this European Standard should be aware that more detailed national standards and/or codes of practice can exist in the CEN member countries. This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above mentioned basic principles.