Answer
A sand layer free of stones is mandatory. The granulation level of the sand should be 0- 2/3 mm. Sharp or sharp-edged items in the trench must be removed in any case. Careful embedding of the pipe into the trench (at a distance of at least 10 cm above and underneath the pipe coating + the distance to the trench walls) has a decisive influence on the durability of the pipe coating. When calculating the minimal covering layer, future building operations (over the entire life time) and possible subsequent damages must be taken into consideration. The filling material must be compressed in layers (if the coverage >500 mm, mechanically). Before filling up the trench, the warning indication must be mounted.
When covering ranges between h=0.5 metres up to a maximum of 6 metres, Uponor Ecoflex jacket pipes can bear soil and traffic loads of SLW 60. The required static verification is listed under regulation ATV-DVWK-A127 currently governing soil-embedded pipes. The verification is required for special mounting conditions only.
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