speed•pipe® bundle ground gabo Systemtechnik SRV-G und SRV-G tc Laying instructions 7 The high-quality material PE-HD of the speed•pipe® and the jacket pipe allows the laying at temperatures of 10 °C below zero. However, the optimum conditions are obtained at temperatures between 5 to 20 °C. At temperatures below the freezing point we recommend to store the coils with the SRV-G before laying in heated halls for 12 to 24 hours. Coefficient of linear expansion for PE-HD: 16 x 10−5 x 1 K This means that each increase or decrease of the temperature of the duct by 1 Kelvin (1 K = 1 °C) the PE-HD duct shall extend or shorten by 0.16 mm per meter length. For avoiding tensions in the duct system particularly in midsummer the duct string must be placed in the trench some time before it is filled, to reach an adaption between duct and soil. Note Depth 1 Kelvin 10 Kelvin 20 Kelvin 30 Kelvin 1 meter 0.00016 m 0.0016 m 0.0032 m 0.0048 m 10 meters 0.0016 m 0.016 m 0.032 m 0.048 m 100 meters 0.016 m 0.16 m 0.32 m 0.48 m 1000 meters 0.16 m 1.6 m 3.2 m 4.8 m To counteract against these laws of physics gabocom recommends the utilisation of the appropriate sealing and fixing elements. Recommendation During pulling of bundles the recommended tensile forces have to be respected and may not be exceeded. Optimum tensile forces are reached at a temperature range from 5 to 20 °C. For the pulling in process into the duct always use a pulling grip. In doing so the speed•pipe® ground and the jacket pipe must be gradated in a way that a uniform force distribution is reached on the entire speed•pipe® bundle. 2. Laying temperatures. 3. Tensile forces.
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