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Retrofit and Management of Water Pipelines with Cathodic Protection: Case Studies

Corrosion of metallic pipelines is a significant source of failures to drinking water utilities. Cathodic Protection has been used for buried metallic pipelines for decades but not widely used in the water industry. Preliminary findings of the on-going Water Research Foundation project.

 

Product Number: 51317--9089-SG
ISBN: 9089 2017 CP
Author: Mersedeh Akhoondan
Publication Date: 2017
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Corrosion of metallic pipelines is a significant source of failures and financial burden to drinking water utilities. Cathodic Protection (CP) has been a recognized technology for buried metallic pipelines for decades but has not been widely used in the water industry. Some water utilities have been exploring a variety of techniques to fight external corrosion and to preserve the value of their buried assets however a standardized and defensible approach does not exist. As part of an on-going Water Research Foundation Project (WRF # 4618) technical and economic considerations for CP installation and retrofit of buried water pipelines have been investigated to generate a best CP practice guide-tailored for water utilities application. The proposed guideline assist water utilities to better understand the implication of CP on the performance of distribution networks and optimize the implementation and scheduling of future CP programs. Typically the effectiveness of a CP program is measured by reduction in breakage rates. Where water utilities do not have specific data on “before and after” CP breakage rates collected data and case studies from other water utilities with similar pipe inventories and operational conditions may be used to make wise CP decisions. This paper summarizes multiple case studies and “lesson learned” obtained from available literature sources or as part of WRF4618 utility surveys and workshops.

Key Words: cathodic protection, hot spot, retrofit, water pipelines, corrosion, service life extension, capital improvement, economy

Corrosion of metallic pipelines is a significant source of failures and financial burden to drinking water utilities. Cathodic Protection (CP) has been a recognized technology for buried metallic pipelines for decades but has not been widely used in the water industry. Some water utilities have been exploring a variety of techniques to fight external corrosion and to preserve the value of their buried assets however a standardized and defensible approach does not exist. As part of an on-going Water Research Foundation Project (WRF # 4618) technical and economic considerations for CP installation and retrofit of buried water pipelines have been investigated to generate a best CP practice guide-tailored for water utilities application. The proposed guideline assist water utilities to better understand the implication of CP on the performance of distribution networks and optimize the implementation and scheduling of future CP programs. Typically the effectiveness of a CP program is measured by reduction in breakage rates. Where water utilities do not have specific data on “before and after” CP breakage rates collected data and case studies from other water utilities with similar pipe inventories and operational conditions may be used to make wise CP decisions. This paper summarizes multiple case studies and “lesson learned” obtained from available literature sources or as part of WRF4618 utility surveys and workshops.

Key Words: cathodic protection, hot spot, retrofit, water pipelines, corrosion, service life extension, capital improvement, economy

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