German and Austrian projects beat pipe-bursting and lining problems

摘要

A 1.1 KM-LONG collector in Erndtebruck, Germany, and a connecting collector to a treatment plant 2.5 km away have already shown immense damage from high water infiltration, despite only being built in 1973. The infiltration flow had risen so much that a newly installed third pump could barely cope with the water volumes at peak times. Seeking a solution to this problem, both the economics of the method to be used as well as the direct investment costs were considered. A further condition was a guarantee of cost-effective long-term use of the pipeline. In this situation, the investment is depreciated over the 'effective' life and, therefore, reflects directly into the annual operation costs. This brought a quick decision to use the pipe-bursting method.