500 450 400 350 300 250 200 150 100 50 0 30 91 39 11 6 60 1 48 75 171 98 1 71 98 2 20 12 7 22 0 14 7 22 0 20 0 31 0 Ø D 21 8 2014 FLEXWELL district heating cable FHK Subject to technical changes Installation without trenches 5 540 The normal bore length is taken as the standard value and is attainable where ground and installation conditions present no particular difficulties the project specific maximum bore length must be determined on a case by case basis taking account of local conditions and permissible tensile tractive forces FZ permissible tensile tractive force for the HDD process A special pulling head must be used for this purpose The bore hole should be widened to the recommended minimum bore hole diameter before the FLEX W E L L district heating cable is drawn in P ulling head Bore le ng th m FLEXWELL district heating cable FHK type D max FZ Recommended min Recommended min Normal bore hole radius bore hole diameter bore length mm KN m mm m 30 91 100 12 25 150 121 39 116 125 15 30 185 112 60 148 160 20 35 240 110 75 171 180 30 50 270 141 98 171 180 40 50 270 190 98 220 230 50 100 345 167 127 220 230 50 100 345 167 147 220 230 60 100 345 201 200 310 320 100 150 480 224

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