District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Surveillance systems; German and English version EN 14419:2009— 51 стр.
District heating pipes - Preinsulated bonded twin pipe systems for directly buried hot water networks - Part 1: Twin pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene; German and English version EN 15698-1:2009— 37 стр.
