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Ductile Iron Wastewater Force Main Failure Analysis And Service Life Estimation

Picture for Ductile Iron Wastewater Force Main Failure Analysis And Service Life Estimation
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Product Number: 51321-16976-SG
Author: Stanley C. Agbakansi; Scott Lehman; Farzaneh Nosouhian; Christopher L. Alexander
Publication Date: 2021
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$20.00
$20.00

Unexpected failures of mortar-lined ductile iron force mains have occurred at unspecified high points due
to internal corrosion aggravated by microbiological activity. To avoid unexpected failures in the future, a
mechanistic understanding of the microbiologically influenced corrosion and degradation and their rates
leading to failure is required. In this work, a detailed failure analysis was performed to uncover the
mechanisms and typical rates of internal corrosion at unknown high points in mortar-lined ductile iron
pipes (MLDIP). A literature review was conducted to identify existing mechanistic models that could be
used in this application to estimate the time to failure considering the composition of wastewater, flow
rate, and the size of the air-pocket to be used as a benchmark for future improvement. Laboratory
experiments were performed to provide an estimate of the deterioration rates of mortar and corrosion
rates of the ductile iron upon exposure to sulfuric acid. The combined results of the failure analysis,
literature review, and experimental work were then used to develop degradation curves to estimate the
time to failure of MLDIP. This work provides the Hillsborough County Public Utilities Department a muchneeded
tool that could guide future design and repair or replacement works at wastewater conveyance
and treatment facilities that can also be leveraged by other organizations.

Unexpected failures of mortar-lined ductile iron force mains have occurred at unspecified high points due
to internal corrosion aggravated by microbiological activity. To avoid unexpected failures in the future, a
mechanistic understanding of the microbiologically influenced corrosion and degradation and their rates
leading to failure is required. In this work, a detailed failure analysis was performed to uncover the
mechanisms and typical rates of internal corrosion at unknown high points in mortar-lined ductile iron
pipes (MLDIP). A literature review was conducted to identify existing mechanistic models that could be
used in this application to estimate the time to failure considering the composition of wastewater, flow
rate, and the size of the air-pocket to be used as a benchmark for future improvement. Laboratory
experiments were performed to provide an estimate of the deterioration rates of mortar and corrosion
rates of the ductile iron upon exposure to sulfuric acid. The combined results of the failure analysis,
literature review, and experimental work were then used to develop degradation curves to estimate the
time to failure of MLDIP. This work provides the Hillsborough County Public Utilities Department a muchneeded
tool that could guide future design and repair or replacement works at wastewater conveyance
and treatment facilities that can also be leveraged by other organizations.

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07127 Investigating Ductile Iron Pipelines

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