The purpose of this standard is to establish the minimum requirements to be considered in the design and construction of internal distribution lines in natural gas receiving facilities for industrial uses in order to obtain an appropriate form of exploitation and adequate safety levels. The concept of the internal distribution line includes the pipes with their accessories and auxiliary elements included between the outlet valve of the Regulation and Measurement Station (ERM), including this one, and the inlet valve to the regulation groups. or, failing that, to the first valve before the point of consumption, including it in either case.