Replacing district heating lines without digging trenches involves removing old line sections at two holes, pulling out line or inner pipe between holes, pulling in new line or pipe between holes

摘要

The method involves making a first opening hole in the heating line run, removing a first part of the old line, making a second hole, removing a second part of the old line, pulling out the old line or the inner heat transport pipe between the opening holes and pulling in a new line or inner pipe then insulating it or pulling in a new pipe with prefabricated insulation.