16 12 2013 EIGERFLEX CPE Subject to technical changes 3 210 Heat loss Heat losses at different external temperatures or surface temperatures of the casing pipe The frost protection strip can no longer compensate for a heat loss of more than 14 W m and there is a danger of freezing For EIGERFLEX pipes no minimal soil temperature is required surface temperatures Tmed 2 C Heat loss figures for EIGERFLEX pipes installed above ground Type of installation Cover above pipe Ground temperature Soil conductivity Medium temperature Conductivity of PUR foam Conductivity of PE pipe Conductivity of PE casing Ground installation H 0 80 m TE Variable see table lE 1 0 W mK Tmed 2 C lPUR 0 023 W mK lHDPE 0 40 W mK lLLDPE 0 33 W mK Type of installation Wind speed Open installation BFT 10 whole gale 25 2 29 m s Heat losses q W m for one UNO pipe Dimension U value Surface temperature C W mK 5 10 15 20 25 25 76 0 1265 0 9 1 5 2 2 2 8 3 4 32 76 0 1611 1 1 1 9 2 7 3 5 4 3 40 91 0 1685 1 2 2 0 2 9 3 7 4 5 50 91 0 2273 1 6 2 7 3 9 5 0 6 1 63 126 0 1982 1 4 2 4 3 4 4 4 5 4 75 126 0 2592 1 8 3 1 4 4 5 7 7 0 90 162 0 2318 1 6 2 8 3 9 5 1 6 3 110 162 0 3392 2 4 4 1 5 8 7 5 9 2 Heat losses q W m ffor one UNO pipe Dimension U value Surface temperature C W mK 5 10 15 20 25 25 76 0 1326 1 0 1 6 2 3 3 0 3 7 32 76 0 1711 1 2 2 1 3 0 3 9 4 8 40 91 0 1798 1 3 2 2 3 2 4 1 5 0 50 91 0 2484 1 8 3 1 4 4 5 7 7 0 63 126 0 2137 1 5 2 6 3 7 4 8 5 9 75 126 0 2863 2 1 3 6 5 1 6 5 8 0 90 162 0 2528 1 8 3 1 4 4 5 7 7 0 110 162 0 3860 2 8 4 8 6 8 8 9 10 9 The minimal temperature for above ground installation is 30 C Heat loss figures for buried EIGERFLEX pipes

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