Wagner, Siedlarak, Kropp, Fischer
Additional Information - Posters # 1995 Edinburgh
A potable water installation using both DHP-copper and polypropylene as described in various German standards has been in operation now for seven years in an official building in Germany. These materials are used in both the cold and hot water section of the building. Plastic pipes have been installed as an alternative material t o copper tubes since the latter failed in a severe manner shortly after commissioning because of microbiologically influenced corrosion leading t o a nonacceptable uptake of copper into the potable water in an obsolete, localized an non-regular fashion. Two test rigs have been installed into the affected potable water installation five years ago to follow the performance of different installation materials with special regard to corrosion and biological parameters. Furthermore, episcopic differential interference contrast with UV fluorescence microscopy has been used to view the surface topography of microorganisms, biofilms and opaque substrata surfaces. The long-time performance of the different installation materials in both potable water supply and test rigs was evaluated.