Menu
Search
Filters
Close
Menu

51315-5470-Monitoring AC Interference and Corrosion on High-pressure Pipeline

Picture for Monitoring AC Interference and Corrosion on High-pressure Pipeline
Available for download
Product Number: 51315-5470-SG
ISBN: 5470 2015 CP
Author: Ian Thompson
Publication Date: 2015
$0.00
$20.00
$20.00
Pipelines networks are increasingly paralleling overhead AC power lines as more pipelines are laid in energy corridors or are built to carry gas into gas powered generating stations. As a consequence there is an increasing requirement to quantify the damage AC corrosion may be causing to these pipelines. Althoughpipeline operatorsroutinely monitor AC current densities at test posts along pipelines interfered with by AC it has not been possible to correlate these current densities with metal loss and hence the AC corrosion rate. Although repeat in-line inspection (ILI) will give an indication of the AC corrosion rate the costs associated with running ILI vehicles at a high enough frequency becomes expensive not least due to the requirement to reduce gas flows during this operation. An alternative approach is to use corrosion monitoring devices based on electrical resistance (ER) probes.The field trials described in thispaperare intended to investigate the response ofone suppliersER probe to the effects of AC voltages and currents induced onto a pipeline known to be experiencing high levels of electrical interference. The paper will discuss the electrical parameters being monitored and the importance of these parameters in terms of the AC corrosion rate. The relationship between AC voltage AC current density and spread resistance on the corrosion rate will be discussed as well as the importance of ground conditions in particular the degree of wetness. The ability of the ER probe to monitor within a short duration metal loss due to AC interference will be demonstrated as well as changes in corrosion rate as the AC current density varies within a 24 hour period due to the varying load on the High Voltage power lines. Typical AC corrosion rates will be discussed with and without the influence of cathodic protection.
Pipelines networks are increasingly paralleling overhead AC power lines as more pipelines are laid in energy corridors or are built to carry gas into gas powered generating stations. As a consequence there is an increasing requirement to quantify the damage AC corrosion may be causing to these pipelines. Althoughpipeline operatorsroutinely monitor AC current densities at test posts along pipelines interfered with by AC it has not been possible to correlate these current densities with metal loss and hence the AC corrosion rate. Although repeat in-line inspection (ILI) will give an indication of the AC corrosion rate the costs associated with running ILI vehicles at a high enough frequency becomes expensive not least due to the requirement to reduce gas flows during this operation. An alternative approach is to use corrosion monitoring devices based on electrical resistance (ER) probes.The field trials described in thispaperare intended to investigate the response ofone suppliersER probe to the effects of AC voltages and currents induced onto a pipeline known to be experiencing high levels of electrical interference. The paper will discuss the electrical parameters being monitored and the importance of these parameters in terms of the AC corrosion rate. The relationship between AC voltage AC current density and spread resistance on the corrosion rate will be discussed as well as the importance of ground conditions in particular the degree of wetness. The ability of the ER probe to monitor within a short duration metal loss due to AC interference will be demonstrated as well as changes in corrosion rate as the AC current density varies within a 24 hour period due to the varying load on the High Voltage power lines. Typical AC corrosion rates will be discussed with and without the influence of cathodic protection.
Also Purchased
Picture for Challenges in Mitigating AC Interference in Remote Areas
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.
Picture for AC Interference and Mitigation: Heartland Case Study
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.
Picture for Study on AC Interference Mitigation Design Methods for Buried Pipelines
Available for download

51313-02444-Study on AC Interference Mitigation Design Methods for Buried Pipelines

Product Number: 51313-02444-SG
ISBN: 02444 2013 CP
Author: Yanxia Du
Publication Date: 2013
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support