BS EN 17414-1 pdf free download

BS EN 17414-1-2020 pdf free download.District Cooling Pipes. Factory Made Flexible Pipe System Classification, General Requirements And Test Methods (British Standard).
6.2 Bending properties
6.2.1 Flexibility
The flexibility of the pipe assembly is verified by testing at the minimum bending radius. The manufacturer of the pipe assembly shall declare the minimum installation bending radii for all dimensions produced, related to the central axis of the pipe assembly.
The minimum declared installation bending radius of the pipe assembly according to this document shall not exceed thirty times the outer diameter of the casing.
When bending to the minimum radius, the service pipe and the casing of the pipe assembly shall not break.
6.2.2 Ovality
The ovality of the casing shall not exceed 30 % when tested according to 7.2.2.
6.2.3 Cracks
Cracks in the insulation layer shall not exceed a width of 5 mm when tested according 7.2.3.
NOTE 1 With a crack size below 5 mm, the number of cracks is not relevant for the integrity of the pipe system, because the temperature on the casing will not be influenced.
NOTE 2 The lower the SDR of the service pipe the higher the stress in the insulation.
6.2.4 Centre line deviation of service pipe
The deviation of the service pipe to the centre line shall not exceed 20 % when tested in accordance with 7.2.4.
6.3 Resistance to external load
6.3.1 Ring stiffness
The ring stiffness shall be tested according to EN Iso 9969 where the diameter of the test piece is the inner diameter of the casing determined at the cross section of the pipe assembly. The ring stiffness of the pipe assembly shall be at least 4 kN/mZ and the ring stiffness divided by the creep ratio according to EN ISO 9967 shall be at least 0,8.
6.3.2 Impact resistance
The impact resistance shall be tested according to EN ISO 3127. The casing of pipe assemblies and joint casings shall show no cracks when exposed to an impact of 4 J.
NOTE The deformation of buried pipes with and without traffic load can be calculated according to EN 1295-1.BS EN 17414-1 pdf download.