Holy Toledo! Follow-Up—Asset Management of a WWII Era 78″ Raw Water Steel Pipeline

The main water supply for the City of Toledo, OH (City) is a 9-mi long, 78-in. diameter steel pipeline that was manufactured and installed during WWII. This pipeline has been in continuous service since that time, except for shutdowns for condition assessment/asset management purposes. The City has a second raw water pipeline, 60-in. PCCP erected in the 1970s, but the focus of this paper is on the original 78-in. raw water main steel pipe. This paper will focus on the asset management recommendations developed based on the condition assessment. The objective of this asset management effort (rehabilitation/replacement evaluation) was to develop a matrix to score the various pipeline rehabilitation or replacement selected options against a defined set of scoring categories with assigned weight factors. A total of 12 different pipeline rehabilitation and replacement options were originally considered. All were reviewed to ensure the required 120 million gallons per day (MGD) would be maintained at the City's request. However, the second step eliminated six options for various reasons (that will be explained), leaving six options to be fully evaluated, including costing. The summary includes the decision the City made regarding this important raw water pipeline, based on the six fully evaluated options presented.