8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes Expansion pad 6 365 Description In order to absorb expansion movements of the underground pipe system in bends branches and reduction pieces expansion pads must be applied to the outer PE casing in these areas Expansion pads are manufactured from cross linked closed cell polyethylene are permanently elastic do not decay and are resistant to chemicals The expansion zone is designed on the basis of pipe statics calculations Delivery The delivery scope for an expansion zone of 1 m comprises 2 pieces of expansion pad strip length 1000 mm which are glued onto the outer casing at the 3 o clock and 9 o clock positions Laminate is then wrapped around the entire zone in order to prevent sand or soil particles from penetrating between the expansion pad and the PE casing Material Polyethylene particle foam Nominal width Size I 120 mm Size II 240 mm Size III 360 mm Nominal thickness 40 mm Diameter of outer casing mm 90 up to 160 180 up to 280 315 up to 355 400 500 up to 560 630 up to 670 710 800 900 1000 Nominal size Name Size 1 Size 2 Size 3 Size 4 Size 5 Size 6 Size 7 Size 8 Size 9 Size 10 existing I II III II II II III III III III II II III III II III III III III III II II Weight kg piece 0 154 0 307 0 461 0 614 0 768 0 922 1 075 1 229 1 382 1 536 kg m 0 307 0 614 0 922 1 229 1 536 1 843 2 150 2 458 2 765 3 072 Volume m piece 0 0048 0 0096 0 0144 0 0192 0 0240 0 0288 0 0336 0 0384 0 0432 0 0480 m m 0 0096 0 0192 0 0288 0 0384 0 0480 0 0576 0 0672 0 0768 0 0864 0 0960 Properties Apparent bulk density Tensile strength Compressive stress 50 deformation at 23 C Vibration fatigue test 80 000 load changes Change in thickness Change in hardness number Absorption of water volume fraction after 1d after 7d Thermal conductivity at 10 C Value 32 160 100 2 4 2 4 2 0 3 0 0 040 Unit Kg m kPa kPa W mK 10 00 10 00 10 00 120 240 360 EP strip 1 m PUR insulation Medium pipe Laminate

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