8 1 2015 INT CASAFLEX district heating pipe CFL Subject to technical changes 4 105 System description 1 Carrier pipe Materials Corrugated carrier pipe made of nickel chromium steel X5 CrNi 18 10 1 4301 AISI 304 or X2 CrNiMo 17 12 2 1 4404 AISI 316L Requirements Steel quality to EN 10088 2 Thermal insulation Material CFC free cyclopentane blown polyisocyanurate rigid foam PIR with l50 value 0 025 W mK PIR insulation Reference temperature C CASAFLEX value Test standard Density 60 kg m3 DIN 53420 Thermal conductivity 50 0 025 W mK DIN 52612 Percentage of closed cells 90 EN 253 Water absorption after 24 hours 10 EN 253 5 Protective casing Material Low density polyethylene PE LD seamlessly extruded Purpose Protection against mechanical action and humidity PE LD protective casing Reference temperature C Value Test standard Density 931 kg m3 ISO 1183 Thermal conductivity 0 43 W mK DIN 52612 Crystallite melting range 122 C ISO 11357 3 3 Expanded metal mesh Material Steel Purpose Mechanical reinforcement of the flexible pipe system 4 Barrier film Material Multiple layer composite film Purpose To impede diffusion of the cyclopentane cellular gas 6 Monitoring wires Materials 1 x NiCr red insulated perforated Ø 1 1 mm 0 5 mm2 1 x Cu green insulated Ø 1 3 mm 0 8 mm2 1 x Cu white with nonwoven Ø 1 55 mm 1 13 mm2 Systems Conductor pairs NiCr red Cu green WIREM Brandes system Cu green Cu white Nordic system Purpose Identification and location of moisture by means of resistance or pulse measurements

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