Cathodic Protection of Water Mains in Ottawa : Analysis and Planning

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ConferenceCorrosion Control for Enhanced Reliability and Safety: 15 September 2003, Ottawa, Ontario
Pages114; # of pages: 14
Subjectwater main renewal program, cathodic protection; Water mains
AbstractThe inventory within the water distribution system of the City of Ottawa consists of 1750 km of cast and ductile iron pipes, installed between 1874 and 2002. Ottawa started a program of cathodic protection (CP) of its water mains in 1990. The program includes both hot-spot and retrofit CP strategies. Reduction in breakage rate has been observed following the initiation of the CP program but a full economic analysis of its effectiveness was never carried out due to lack of modeling and analytical tools. The Institute for Research in Construction (IRC) of the National Research Council Canada (NRC) has recently developed a software application, WARP, (Water main Renewal Planner) that facilitates economic analysis specifically for water distribution systems. The application of WARP to data from the City of Ottawa is described in the form of a case study. WARP was developed with the support of 12 Canadian water utilities (including the City of Ottawa) and one anode manufacturer. WARP models deterioration and breakage rates and takes into consideration time-dependent factors such as: temperature, soil moisture and, cathodic protection (CP) strategies, including both hot-spot and methodical retrofit CP. It quantifies the influence of each of these factors on pipe-breakage rates to (a) identify the ?true? deterioration rates of buried water mains, and (b) project the economic impact of various operational strategies on future breakage rates.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number46653
NPARC number20378522
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Record identifier9a99518d-4075-4df0-ac19-537ed96b91f2
Record created2012-07-24
Record modified2016-05-09
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