NBN EN 14408-1:2004

This document specifies the requirements and test methods for plastics piping systems used for renovation of underground gas supply networks. It is applicable to pipes and fittings as manufactured as well as to the installed lining system; it does not cover sprayed coatings, the existing pipeline or any annular filler.
Functional recommendations on this subject are covered by EN 12007 parts 1 and 4.
This part of EN 14408 deals with the general requirements common to all relevant renovation techniques as defined in 3.2.