NBN EN 15001-1:2009

This standard specifies detailed functional requirements for the design, selection of materials, construction, inspection and testing 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 standard also covers the inlet connection to the gas appliance comprising of the pipework that does not fall within the scope of the appliance standard.
NOTE The use of the term installation and pipework is interchangeable.
This standard applies to gas installations 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 should additionally be made to EN 13480 for metallic pipework.
For industrial gas installations up to and including 0,5 bar and for non industrial (residential and commercial) gas installations up to and including 5 bar in buildings, EN 1775 applies.
For gas installations that do not fall within the scope of EN 1775 or other European Standards, this standard applies.
In this standard, the term “gas“ refers to combustible gases, which are gaseous at 15 °C and 1 013 mbar absolute atmospheric pressure (normal conditions). 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 (see Table 1 of EN 437:2003). The given values are considered as normal conditions for all volumes given in this standard.