Monday, December 3, 2007 - 2:00 PM

Establishing a CP Data Baseline for Preventive Maintenance for the Las Vegas Valley Water District

Gregory P. Fehr, ATMG; Maurice Delisle, Las Vegas Valley Water Dist

Beginning in 2004, the Las Vegas Valley Water District began a project to identify the corrosion condition of the entire metallic piping system. From this baseline, future preventive maintenance and service life forecasting would result.  This process included the updating of the existing corrosion monitoring database that contained limited historical initial native and cathodic protection (CP) pipe to soil potentials, capturing current test data from all 2400 existing test stations, establishing algorithms for determining pipes at risk, forecasting maintenance and useful life, and preparing maintenance schedules for both test stations and the piping infrastructure.
 As with many similar efforts, many unexpected problems surfaced during the initial attempts to capture the latest test data.   Additional problems dealt with having a range of pipe materials, foreign pipe issues, database inconsistencies, data collection errors, and third party damage.
 This paper addresses the many lessons learned from managing a project of this size, serving approximately 1.2 million customers, in addition to presenting a format for successfully collecting data, creating a useful database, and applying the information to predict and increase pipeline service life.  The process described here is applicable to any piping infrastructure system including military facilities.