INDICATORS FOR MICROBIOLOGICALLY INDUCED CORROSION OF COPPER PIPES INA COLD-WATER PLUMBING SYSTEM

Corrosion damage in the copper cold-water plumbing system of a large b uilding was investigated. An unusual combination of corrosion patterns was found on the inner copper pipe surfaces that were in contact with water. Damage was in the form of shallow cavities, a surface cover or pinprick-like pits. The corrosion system was influenced by thermal tr eatment and also by cefoxitin dosing. The latter fact in particular is a clear indication of microbiological involvement in this corrosive a ction. Different parameters, to be measured in standing water (24-h st agnation), are considered typical for this type of corrosion: the dete ction of Sphingomonas spec, and other species in whose cell wall regio ns copper can accumulate, a copper content of more than 2 mg/l, oxygen consumption of more than 4 mg/l and an increase in pH. With the help of these indicators, it is possible to recognize microbiologically ind uced corrosion in copper plumbing systems before pipe perforation occu r.