District heating pipes. Bonded twin pipe systems for directly buried hot water networks, Factory made twin pipe assembly of steel service pipes, polyurethane thermal insulation and one casing of polyethylene— 18 стр.
District heating pipes. Preinsulated bonded twin pipe systems for directly buried hot water networks. Twin pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene— 22 стр.
