Standard NBN EN 15698-1:2019
District heating pipes - Bonded twin pipe systems for directly buried hot water networks - Part 1: Factory made twin pipe assembly of steel service pipes, polyurethane thermal insulation and one casing of polyethylene
23.040.07 Pipelines and its parts for district heat 23.040.10 Iron and steel pipes
This document specifies requirements and test methods for straight lengths of factory made thermally insulated bonded twin pipe assemblies for directly buried hot water networks in accordance with EN 13941 1, comprising two steel service pipes, rigid polyurethane foam thermal insulation and one casing of polyethylene. The pipe assembly can also include the following additional elements: measuring wires, spacers and diffusion barriers.