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51318-11064-Application of Indirect Condition Assessment Techniques for Buried Water Pipelines: A Case Study

Picture for Application of Indirect Condition Assessment Techniques for Buried Water Pipelines: A Case Study
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Indirect assessment techniques (special over-the-line potential and soil corrosivity surveys) were applied on an electrically discontinuous effluent sewer land outfall. Critical areas were excavated and direct assessment performed.  Mitigation methods were recommended.

Product Number: 51318-11064-SG
Author: Mersedeh Akhoondan / Brien Clark / Graham Bell
Publication Date: 2018
Industries: Water/Wastewater , Corrosion Monitoring and Control
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$20.00
$20.00

Failure of water/wastewater mains incurs heavy repair and replacement costs, in addition to customer’s inconvenience. Taking preventive measures such as condition assessment for early determination of corrosion in aging infrastructures is crucial for agencies from both a safety and an economic standpoint. Direct assessment techniques provide valuable insight on the existing condition of any buried structures. In an ideal case, agencies would have enough time, budget, and resources to reveal, excavate, and conduct direct assessment of their entire aging assets (e.g., miles of pipelines). In practice, such extensive assessments seldom occur and are not necessary. Indirect techniques (special over-the-line potential and soil corrosivity surveys) for external condition assessment of water/wastewater lines can be conducted to determine the high risk corrosion areas for further direct evaluation. This paper presents a case study where such indirect assessment techniques were successfully applied on an electrically discontinuous effluent sewer land outfall. Additionally critical areas were identified for excavation and direct assessment was performed. The results of direct assessment were in agreement with the over-the-line survey findings. The 40-year old sewer pipeline was located in environmentally sensitive areas (no tolerance for breaks) and may have become affected by nearby construction loads due to a road widening project. After the existing condition of the pipeline was determined mitigation methods for in-situ protection of the pipeline was recommended.

Key Words: corrosion, cathodic protection, close interval potential survey (CIS), water and wastewater pipelines, indirect and direct condition assessment, life extension, leaks, joints, electrically discontinuous pipe.

 

Failure of water/wastewater mains incurs heavy repair and replacement costs, in addition to customer’s inconvenience. Taking preventive measures such as condition assessment for early determination of corrosion in aging infrastructures is crucial for agencies from both a safety and an economic standpoint. Direct assessment techniques provide valuable insight on the existing condition of any buried structures. In an ideal case, agencies would have enough time, budget, and resources to reveal, excavate, and conduct direct assessment of their entire aging assets (e.g., miles of pipelines). In practice, such extensive assessments seldom occur and are not necessary. Indirect techniques (special over-the-line potential and soil corrosivity surveys) for external condition assessment of water/wastewater lines can be conducted to determine the high risk corrosion areas for further direct evaluation. This paper presents a case study where such indirect assessment techniques were successfully applied on an electrically discontinuous effluent sewer land outfall. Additionally critical areas were identified for excavation and direct assessment was performed. The results of direct assessment were in agreement with the over-the-line survey findings. The 40-year old sewer pipeline was located in environmentally sensitive areas (no tolerance for breaks) and may have become affected by nearby construction loads due to a road widening project. After the existing condition of the pipeline was determined mitigation methods for in-situ protection of the pipeline was recommended.

Key Words: corrosion, cathodic protection, close interval potential survey (CIS), water and wastewater pipelines, indirect and direct condition assessment, life extension, leaks, joints, electrically discontinuous pipe.

 

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51318-11244- MIC Considerations for Cathodically Protected Encased Ductile Iron Pipelines: A Case Study

Product Number: 51318-11244-SG
Author: Jeffry B. Giddings / Mersedeh Akhoondan / Graham Bell
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A case study where MIC was recognized as primary cause of failure for an encased ductile iron water pipeline. The cathodically protected pipe was located within the proximity a creek crossing and had suffered from multiple failures.

 

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Product Number: 51318-11059-SG
Author: Mel Esmacher / Kumar Kembaiyan / Tony Navarrete / Andrew Rentsch
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A polyethylene unit experienced a gas leak within a high pressure tube and shell heat exchanger. Failure analysis revealed that the tube wall loss was beneath residual deposits. Preventative measures and improvements in inspection & cleaning procedures are discussed.

 

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

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 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.

 
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