A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Assessing Pipe Condition and Risk in Portland, Oregon's Distribution System
The Portland, Oregon, Water Bureau (Portland) has initiated a multi-faceted effort to better understand the condition of water system and to identify areas of high risk that were not being addressed. These undertakings have resulted in a more comprehensive view of the distribution system and spending priorities. Efforts to understand pipe condition and risk include: 1. Close interval potential surveys (CIPS) over steel pump mains with subsequent inspection where the survey indicated high corrosion potential. 2. Weibull failure analysis to predict useful life for cast iron (CI) pipe. 3. Service tap pipe coupon blasting and inspection for graphitization. 4. Identifying critical pipes with multiple breaks from leak records and GIS; 5. Assessing risk (likelihood of failure and consequences of failure) associated with vulnerable pipelines. Portland has prioritized pipe replacements using leak history for 20 years. However, only a few pipes besides small steel and galvanized mains have experienced more than 2 breaks in 30 years of recordkeeping, so we don't have many data points for assessing condition. Out of the over 91,000 GIS pipe segments that make up Portland's piping network, about 4,700 segments are on the high vulnerability list and are being rated for relative risk. Likelihood of failure is based on what we know about their physical condition and site conditions that could make failure more likely, while consequences are assigned using a matrix of potential consequences and their relative severity that was developed by a cross functional team. This paper will discuss some of Portland's recent condition assessment undertakings in greater detail, what we have learned, and how that knowledge is affecting the spending priorities within the Bureau.
Assessing Pipe Condition and Risk in Portland, Oregon's Distribution System
The Portland, Oregon, Water Bureau (Portland) has initiated a multi-faceted effort to better understand the condition of water system and to identify areas of high risk that were not being addressed. These undertakings have resulted in a more comprehensive view of the distribution system and spending priorities. Efforts to understand pipe condition and risk include: 1. Close interval potential surveys (CIPS) over steel pump mains with subsequent inspection where the survey indicated high corrosion potential. 2. Weibull failure analysis to predict useful life for cast iron (CI) pipe. 3. Service tap pipe coupon blasting and inspection for graphitization. 4. Identifying critical pipes with multiple breaks from leak records and GIS; 5. Assessing risk (likelihood of failure and consequences of failure) associated with vulnerable pipelines. Portland has prioritized pipe replacements using leak history for 20 years. However, only a few pipes besides small steel and galvanized mains have experienced more than 2 breaks in 30 years of recordkeeping, so we don't have many data points for assessing condition. Out of the over 91,000 GIS pipe segments that make up Portland's piping network, about 4,700 segments are on the high vulnerability list and are being rated for relative risk. Likelihood of failure is based on what we know about their physical condition and site conditions that could make failure more likely, while consequences are assigned using a matrix of potential consequences and their relative severity that was developed by a cross functional team. This paper will discuss some of Portland's recent condition assessment undertakings in greater detail, what we have learned, and how that knowledge is affecting the spending priorities within the Bureau.
Assessing Pipe Condition and Risk in Portland, Oregon's Distribution System
Liberator, Teri (author)
International Pipelines Conference 2008 ; 2008 ; Atlanta, Georgia, United States
Pipelines 2008 ; 1-10
2008-07-17
Conference paper
Electronic Resource
English
Assessment , Infrastructure , Pipes , Oregon , Water distribution systems , Pipelines , Costs , Assets
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