The effectiveness of cathodic protection (CP) in water mains can ultimately be expressed in terms of economic benefits obtained as a result of reduction in breakage frequency and deferral of pipe replacement. Modelling this effectiveness can be challenging because breakage frequency in water mains can be affected by several factors, both static (pipe size, material, soil type, etc.) and dynamic (climate, CP practices, etc.). An approach is presented that was developed by Canadian research institutes in collaboration with Canadian water utilities. Breakage patterns, before and after implementation of CP, were statistically analysed. Contributing factors such as pipe and soil characteristics, climatic changes and the type of CP (retrofit or hotspot) are explicitly considered. A time-dependened multi-covariate break prediction approach was used to model the effects of CP on the breakage rates of water mains. Once the parameters of these breakage patterns are extracted, a through economic analysis was performed.
Modelling the effectiveness of cathodic protection in water mains
Modellierung der Effektivität des kathodischen Schutzes in Wasserleitungen
2003
8 Seiten, 6 Bilder, 3 Quellen
Conference paper
English
Effectiveness of cathodic protection
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