8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes Filling in the pipe trenches 6 502 Surrounding material sand Compactable washed sand max particle size 8 mm 0 8 mm Finest particle component 0 25 mm not more than 8 if possible Friable or smallest possible loam component As an alternative so called cyclone sand sludge sand particle size 0 1 mm is permitted the waste from washed sand Crushed glass is not permitted as a substitute for sand with PREMANT district heating pipe it is allowed for FLEXWELL Embedding the pipe in sand as per Trench Profile sheet Coverage over crown of pipe at least 10 cm Compaction very important The sand must be compactly bedded in or compacted by hand with suitable implements such as a spade or pick axe handle in layers between below and next to the pipes No cavities must be created Important Do not damage the sealing strips and pipes Residual infill of the pipe trench The rest of the trench must be filled in with layers of compactable material such as excavated material and or fine gravel which must be well compacted Local regulations govern the use of excavated material and the minimum thickness of the fine gravel layer To compact the material use a vibrator providing max 100 kPa pressure unit of area Earliest compaction from 30 cm coverage of pipe crown Remember install pipe warning tape and any protective pipes not over the pipes approx 30 cm above pipe crown Top layer use humus or HMT according to regulations If coverage is insufficient 60 cm and in zones with heavy traffic loads pressure distribution plates must be installed over the sand layer to relieve pressure on the pipes In general all construction and safety regulations must be followed

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