8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes Rigid Foam Beams 6 357 Rigid foam beams serve as a support for preinsulated jacket pipes in the pipe trench PU rigid foam beams can remain in the sand filled pipe trench For large pipelines rigid foam beams are only limited useable They tend to break under the heavy load if they lay hollow The additional effort for a plane trench bottom is in most cases not justifiable German Pipe suggests for pipelines from DN 250 to use sandbags sand beds or square timbers While aligning the pipeline using square timbers it is necessary to remove the square timbers after finishing the welding works and before the sand back filling Otherwise the jacket pipe may be damaged due to the thermal expansion Nominal Size Size Length 1 100 x 100 mm 1000 mm Characteristics Value Unit Material Polystyrol Compressive strength 150 kPa Density 30 kg m3 Thermal conduction group 040

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