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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
Available for download
Product Number: 51321-16976-SG
Author: Stanley C. Agbakansi; Scott Lehman; Farzaneh Nosouhian; Christopher L. Alexander
Publication Date: 2021
$0.00
$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

Product Number: 51300-07127-SG
ISBN: 07127 2007 CP
Author: Daniel W. Crabtree, Mark R. Breslin, Chris J. Sordelet, Johnnie A. Terrazas, and John Van Deusen
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This paper presents several case histories where ductile iron pipeline sections have been investigated to ascertain the corrosioncontrol benefits of polyethylene encasement. Investigative procedures, included cell-to-cell potential surveys, side-drain technique measurements, in-situ and laboratory soil tests, pipe-to-soil potential measurements and excavation inspections.
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51313-02485-Ductile Iron Corrosion Science and Theories

Product Number: 51313-02485-SG
ISBN: 02485 2013 CP
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Picture for 04046 Corrosion Protection of Ductile Iron Pipe
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04046 Corrosion Protection of Ductile Iron Pipe

Product Number: 51300-04046-SG
ISBN: 04046 2004 CP
Author: David H. Kroon, Dale Donald Lindemuth, Sheri L. Sampson and Terry Vincenzo, Corrpro Companies Inc.
Publication Date: 2004
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A two-year study of corrosion and protection of ductile iron pipe. Field and laboratory evaluations of short and long term polarization rates. Corrosion rate reduction and cathodic current criterion. Benefits of the traditional, standard asphaltic shop coating. A database of 1379 inspections of buried iron water lines. Result: A risk based protection design strategy for buried ductile iron pipelines.
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