ČSN EN 253+A2   (383371) Vedení vodních tepelných sítí - Předizolované sdružené potrubní systémy pro bezkanálové vedení vodních tepelných sítí - Potrubní systém z ocelové teplonosné trubky, polyurethanové tepelné izolace a vnějšího opláštění z polyethylenu

Anotace textu normy ČSN EN 253+A2   (383371)

This European Standard specifies requirements and test methods for straight lengths of prefabricated thermally insulated pipe-in-pipe assemblies for directly buried hot water networks, comprising a steel service pipe from DN 15 to DN 1200, rigid polyurethane foam insulation and an 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 pipe assemblies, for continuous operation with hot water at various temperatures up to 120 °C and occasionally with a peak temperature up to 140 °C.

The estimation of expected thermal life with continuous operation at various temperatures is outlined in Annex B.