8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes Pipe routing Pipe routing for PREMANT district heating pipe is not subject to any special requirements In relation to the pipe it should mainly be selected on the basis of expansion capability In normal pipe routing changes of direction using L bends are the first choice for this purpose Then come Z bends and U bends which accommodate the expansion that occurs at precisely defined points The angular dimensions of the expansion bend should not exceed 90 otherwise substantially longer expansion limbs are needed whenever possible right angled pipe routing should be the aim If no expansion can be accommodated in buildings fixed points must be positioned in the building wall or approx 3 m in front of it Figure 1 Straight pipe routing between two build ings the expansion of the district heating pipes has to be accommodated in building A or B Figure 4 Straight pipe routing between two build ings with expansion accommodated by U bends within the pipeline Figure 2 Angled pipe routing expansion accom modated by natural change of direction in the L bend and building A Figure 5 Angled pipe routing between two build ings with expansion accommodated by Z bends within the pipeline Figure 3 Straight pipe routing between two build ings with expansion accommodated by Z bends within the pipeline Figure 6 Straight pipe routing with expansion ac commodated by U bends within the pipeline B B B B B BA A A A A A FP 3 m I Building 6 230

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