ABSTRACT

The German design code DWA-A 143-2:2015 differentiates between four Host Pipe States. In some foreign standards (e.g. ASTM F 1216 and SRM) two states are defined: Sewer partially deteriorated (structurally safe) or fully deteriorated (deteriorated pipe). More important is a different theoretical basis, the application of imperfections and the need of regarding liner stresses.

Experiments are helpful to understand stability and break failure modes and to create appropriate imperfections. An overview on numerous liner buckling results is presented and compared with the theoretical critical water pressures in a large scale of liner slenderness r L/t L.