Standard

NS-EN 253:2009

Withdrawn

Note: This standard has a new edition: NS-EN 253:2019+A1:2023

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Abstract

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.

Document information

  • Standard from SN
  • Published:
  • Withdrawn:
  • Edition: 2009-01
  • Version: 1
  • Document type: NAT
  • ICS 23.040.07
  • ICS 23.040.10
  • National Committee SN/K 51

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