Avoiding Faults: AC Current Mitigation on a Large Diameter Steel Pipeline—Case Study
Publication: Pipelines 2024
ABSTRACT
In 2015, the Willamette Water Supply Program (WWSP) in Beaverton, Oregon, was completing alignment selection for its new 1.67 m (66-in.) diameter, welded-steel water transmission pipeline. A “pinch point” in the alignment required the pipeline to pass within a reduced public right-of-way, “squeezed” between two electrical substations, and perpendicular to underground control, substation ground fault conduits, communication cables, and overhead transmission lines connecting the two substations. The existing electrical infrastructure and public utilities presented unique design and constructability challenges that included underground and overhead vertical clearances, potential impact of ground faults, and maintaining existing controls. Several methods of addressing the ground fault concerns were evaluated, including encasement, large diameter isolation flanges or joints, increased pipeline depth to attain a minimum separation distance, and modifications to the electrical facilities themselves. This paper presents the reasons for selecting this challenging pipeline alignment, the initial and intermediate mitigations considered, and the selected solutions.
Get full access to this chapter
View all available purchase options and get full access to this chapter.
REFERENCES
APHA Standard Method 2320-B. “Standard Methods for the Examination of Water and Wastewater, Alkalinity, Titration Method.” Jointly published by APHA, American Water Works Association (AWWA), Water Environment Federation (WEF).
ASTM. ASTM D4327. Standard Test Method for Anions in Water by Chemically Suppressed Ion Chromatography, ASTM International, West Conshohocken, PA.
ASTM. ASTM D6919. Standard Test Method for Determination of Dissolved Alkali and Alkaline Earth Cations and Ammonium in Water and Wastewater by Ion Chromatography, ASTM International, West Conshohocken, PA.
ASTM. ASTM D6639. Standard Guide for Using the Frequency Domain Electromagnetic Method for Subsurface Investigations, ASTM International, West Conshohocken, PA.
ASTM. ASTM G51. Standard Test Method for Measuring pH of Soil for Use in Corrosion Testing, ASTM International, West Conshohocken, PA.
ASTM. ASTM G57. Standard Test Method for Field Measurement of Soil Resistivity Using the Wenner Four-Electrode Method, ASTM International, West Conshohocken, PA.
ASTM. ASTM G187. Standard Test Method for Measurement of Soil Resistivity Using the Two-Electrode Soil Box Method, ASTM International, West Conshohocken, PA.
NACE CP Interference Course Manual, January 2012. AMPP (formerly NACE, International), Houston, TX.
NACE SP0177 “Mitigation of Alternating Current and Lightning Effects on Metallic Structures and Corrosion Control Systems,” AMPP (formerly NACE, International), Houston, TX.
Information & Authors
Information
Published In
History
Published online: Aug 30, 2024
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.