Rehabilitation and Maintenance of Drains and Sewers / Prof. Dr.-Ing. D. Stein, Dipl.-Ing. R. Stein (2004)

Stationary Investigations

In these investigations, the position of the cleaning nozzle lying on the pipe invert remains unaltered. It is positioned in such a manner that any damage that occurs in the pipes and pipe joints can be observed. The investigations are carried out at various pressure levels, whereby the pressure begins at 75 or 100 bar and is raised by steps of 25 bar up to the maximum pressure of the cleaning system. Each level of pressure is maintained for 1 minute after which an optical evaluation is carried out.

Rehabilitation and Maintenance of Drains and Sewers / Prof. Dr.-Ing. D. Stein, Dipl.-Ing. R. Stein (2004)