AMPP Store - Products tagged with 'ac corrosion'

Available for download

AC Interference and Mitigation: Heartland Case Study

Product Number: 51317--9461-SG

ISBN: 9461 2017 CP

Author: Matthew Lechelt

Publication Date: 2017

$20.00

Challenges associated with coordinating the modelling, design, and installation of an alternating current interference and mitigation systems. The project consisted of a 65 kilometer long double circuit 500 kilovolt (kV) overhead transmission in a heavily congested right-of-way corridor with more than 80 pipelines.

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Case Study - Sharing An AC Mitigation System

Product Number: 51322-17786-SG

Author: Hycem Bahgat, Daniel Hebb, Sorin Segall, Ernesto Gudino, Karl Shen, Shan Jiang

Publication Date: 2022

$20.00

AC interference analysis between high voltage AC (HVAC) powerlines and buried pipelines is a matter of current interest due to the growing number of right-of-ways shared between powerline and pipeline infrastructure. This is only expected to increase as the worldwide energy demand grows considerably over the next 30 years,¹ and stricter environmental regulations and policies are applied. Therefore, AC interference will continue to be an issue of concern for powerline and pipeline operators to protect the public, environment, and maintain asset integrity.

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Challenges in implementing SP21424-2018 AC Corrosion Criteria

Product Number: 51321-16245-SG

Author: S.M Segall, P. Eng/E. Gudino, P. Eng/C. Khattar, P. Eng./H. Bahgat, P. Eng./J.P Boudreault, P.Eng./S. Chen P. Eng, PhD

Publication Date: 2021

$20.00

Available for download

Challenges in Mitigating AC Interference in Remote Areas

Product Number: 51317--9090-SG

ISBN: 9090 2017 CP

Author: Malvin Luk

Publication Date: 2017

$20.00

An AC interference study was conducted in 2015 after the installation of a 240 kV powerline. Risk of AC corrosion was indicated. Describe are both the challenges and the solutions, including the design of a temporary mitigation system allowing energization of the powerline at reduced power.

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Comparing AC Study Techniques In Addressing AC Corrosion Risk

Product Number: 51322-17735-SG

Author: Perry Ross

Publication Date: 2022

$20.00

AC interference studies have become increasingly popular in an industry where shared right of ways have increased and there has been a better understanding of how AC interacts between pipelines and powerlines that are collocated with each other. While modeling software for AC interference studies have been developed since the 1990s, advancement in AC interference processes have occurred as more has been learned over the years. When performing an AC interference study there are three steps that need to be completed: field data collection, modeling, and mitigation design. Within this paper, we can compare a project from ten years ago to a project from today to understand the developments that have been made over the course of time to improve the way we develop our mitigation designs.

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Discussion On AC Corrosion Mechanism And Risk Assessment For Cathodically Protected Pipelines

Product Number: 51321-16978-SG

Author: Yanxia Du; Yi Liang; Sili Xie; Lei Zhang

Publication Date: 2021

$20.00

Available for download

Effect of Chemical Environment and pH on AC Corrosion of Cathodically Protected Structures

Product Number: 51317--9352-SG

ISBN: 9352 2017 CP

Author: Andreas Junker-Holst

Publication Date: 2017

$20.00

AC corrosion of structures under cathodic protection (CP) is a major concern for pipelines. This work investigates the effect of soil constituents - earth alkali elements Ca and Mg - believed to have a large influence on the precipitation of hydroxides and carbonates in front of a coating damage.

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Evaluating AC Corrosion in Shared Corridors with Multiple Circuits

Product Number: 51324-20764-SG

Author: David Lewis; Majid Siahrang

Publication Date: 2024

$40.00

Growth in electrical generation sources and greater electrical power demands in North America, drive need for new electric transmission lines with multiple circuits. Many understand a transmission line loading can vary seasonally and increase over time. Typical approaches to address the variation in analyzing AC corrosion is simply using the maximum transmission line loading. In corridors with multiple circuits, the maximum transmission line loading may significantly underestimate the maximum induced voltage on inductively coupled pipelines. Multiple circuits significantly add to the complexity of AC corrosion as variable loading and even power flow direction affect the vectoral summation of magnetic fields. This paper highlights the challenges that engineers will overcome in addressing shared corridors with multiple circuits. This includes the need to understand the phase configuration, power system rotation, power flow, and the importance that engineering tools consider varying induction on shield wires.

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Evaluation of Transmission Line Sag for Magnetically Induced Voltage on Pipelines in Shared Corridors

Product Number: 51323-19508-SG

Author: David Lewis PE

Publication Date: 2023

$20.00

AC interference studies are complex and require complex analysis methods to accurately evaluate these
projects. Sag is a variable that affects each of these projects to varying degrees, but many tools are
challenged to consider the catenary curve of the phase conductors. Sharing common engineering
methodologies for approximating the sag and comparing these to more accurate catenary curves guide
engineers where simplification of the sag may result in significant analysis errors, and scenarios where
simplification may be acceptable.

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Impact of Power System Design and Operating Conditions for AC Interference on Pipelines

Product Number: 51324-20926-SG

Author: Majid Siahrang; Kurt Bell; David Lewis

Publication Date: 2024

$40.00

Power system design and operating conditions have strong impacts on the AC interference levels on pipelines in joint-use corridors. Engineers analyzing the AC interference must understand when certain design and operating parameters are significant factors to the accuracy of the analysis. This paper discusses the impact of several transmission line design parameters including transmission structure design, phasing configuration, shielding design and parameters, line loadings, load unbalance, fault contribution, and more factors that affect recipient pipelines’ voltage in joint-use corridors. As each corridor has unique characteristics, understanding the significance of each power system variable promotes coordination between industries.

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Improving the Quality of ECDA Indirect Inspection Data

Product Number: 51317--9038-SG

ISBN: 9038 2017 CP

Author: Sorin Segall

Publication Date: 2017

$20.00

The quality of indirect inspection data is critical in an External Corrosion Direct Assessment (ECDA). The need exists to increase the accuracy of the field data collection, to improve the data processing and to effectively present the results. This paper describes several challenges.

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Innovative Mitigation Strategies to Address Ac Corrosion At Higher Frequencies

Product Number: 51323-19280-SG

Author: Wolfgang Fieltsch, J. Scott Farquharson

Publication Date: 2023

$20.00

A corrosion investigation performed in 2018 on an NPS 6, approximately 4 km long, polyethylene coated pipeline determined that the accelerated corrosion anomalies detected during in-line inspections (ILI) were due to AC corrosion. The AC and DC current densities on the AC coupons adjacent to these anomalies were above the limits recommended in NACE SP21424. It was also determined that the line was cathodically over-protected, and that most of the AC voltage measured on the line was due to 120 Hz AC ripple from a foreign rectifier.

Products tagged with 'ac corrosion'

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