21 8 2014 FLEXWELL district heating cable FHK Subject to technical changes System description 1 Medium pipe Materials Corrugated medium pipe made of nickel chromium steel X5 CrNi 18 10 1 4301 AISI 304 or X6 CrNiMoTi 17 12 2 1 4571 AISI 316Ti or X2 CrNiMo 17 12 2 1 4404 AISI 316L Requirements Steel quality to EN 10088 2 Thermal insulation Materials CFC free flexible polyurethane foam PUR with l 50 value of 0 032 W mK resistant up to 150 C 5 110 PUR insulation Reference temperature FHK value Test standard Density 60 kg m 3 D I N 5 3420 Thermal conductivity 50 C 0 032 W mK DIN 52612 Percentage of closed cells 90 Water absorption after 24 hours 10 EN 253 3 CrNi steel casing Materials Corrugated steel casing in 1 4512 DI N E N 10088 2 4 Anti corrosion protection Materials Polyment layer bitumen caoutchouc paste 5 PE LD protective casing Materials Made of polyethylene 2YM2 PE to VDE 0209 Purpose Protection against mechanical actions and humidity PE LD protective casing Reference temperature Value Test standard Density 50 C 931 kg m 3 ISO 1183 Thermal conductivity 0 43 W mK DIN 52612 C r ystallite melting range 122 C ISO 11357 3 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 a Cu green b WIREM Brandes system Cu green b Cu white c Nordic system Purpose Identification and location of moisture by means of resistance and pulse measurements

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