Plastics piping systems for water supply, and for drainage and sewerage under pressure - Polyethylene (PE) - Part 1: General; German version EN 12201-1:2011— 20 стр.
District heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification, general requirements and test methods; German version EN 15632-1:2009+A1:2014— 33 стр.