EN 15698-1:2009 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
This European Standard for District Heating Twin Pipes; specifies requirements and test methods for straight lengths of prefabricated thermally insulated pipe-in-pipe assemblies for directly buried hot water networks; comprising two steel service pipes from DN 15 to DN 250; rigid polyurethane foam insulation and one cylindrical outer casing of polyethylene. The pipe assembly may also include the following additional elements: Measuring wires; spacers and diffusion barriers.This standard applies only to insulated twin pipe assemblies; for continuous operation with hot water at various temperatures up to 120 ℃ and occasionally with a peak temperature up to 140 ℃. The estimation of expected thermal life with continuous operation at various temperatures is outlined in Annex B of EN 253.
EN 15698-1:2009 history
2009EN 15698-1:2009 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