BS EN 17414-1:2020 pdf free.District cooling pipes一Factory made flexible pipe system,Classification, general requirements and test methods.
BS EN 17414-1 This document specifies requirements and test methods for factory made thermally insulated flexible pipe-in-pipe assemblies for directly buried district cooling distribution systems, comprising a service pipe and a casing of polyethylene. The pipe assembly can also include the following additional elements:measuring wires, spacers and diffusion barriers.
This document is intended to be used in conjunction with EN 17414-2 or EN 17414-3.This document applies only to insulated pipe assemblies, for continuous operation with water at
various temperatures (1 to 30) °C and a maximum operation pressure of 25 bar dependent on material specified.The design is based on an expected service life with continuous operation of a minimum 50 years. For pipe systems with plastic service pipes, the respective temperature profiles are defined in EN 17414-2 and EN 17414-3.NOTE For the transport of other liquids, for example potable water, additional requirements could be applicable.6.5.3 Stress crack resistance of the material The time for the stress crack resistance of PE-HD materials used for the casing shall be at least 100 hours when tested at 4 MPa and 80 °C in accordance to ISO 16770.NOTE The test can be carried out on specimens prepared by compression moulding, injection moulding or extrusion from the same raw material as being used for the production of the casing.PE-LD and PE-LLD materials used for the casing shall not exceed a failure rate F20 when tested for 1 000 hours in accordance with EN 6081 1-406:2012, procedure B.6.5.4 Use of rework material If rework material is used, only clean, rework material generated from the manufacturer’s own production that does not include any PU insulation material, shall be used.6.6 Surveillance systems If measuring elements for surveillance systems are being installed in flexible pipe systems, all elements installed and the total installation in pipe systems shall comply with the requirements of EN 14419.BS EN 17414-1 pdf download.