Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

09545 Interference of an Impressed CP System with an Adjacent Sacrificial CP System and its Mitigation

Picture for 09545 Interference of an Impressed CP System with an Adjacent Sacrificial CP System and its Mitigati
Available for download
Product Number: 51300-09545-SG
ISBN: 09545 2009 CP
Author: Fawzi S. AL-Madani, Ezeddin R. Busba, David Scantlebury and Hussain S. Boshalla
Publication Date: 2009
$0.00
$20.00
$20.00
An existing impressed CP system of steel tanks was found to be interfering with newly installed zinc anodes of an adjacent Pre-stressed Concrete Cylinder Pipeline. The interference prevented the zinc anodes from providing protection current. The two protected structures are electrically bonded. Field measurements showed that some zinc anodes were providing current. Other anodes acted as if receiving current from the pipes. The latter was thought to be a cause of accelerated pipe corrosion (reversed circuit). The tank bottom plates were also found to have lost protection. In this paper, analysis of field data revealed that all of the zinc anodes in the vicinity of the tanks were picking up stray current. A mitigation measure was proposed to remove the existing resistive bond between the two structures and install a few zinc anodes at the discharge area. An experimental approach was undertaken to determine the effectiveness of this method by simulating the problem on a lab scale. Experimental measurements showed that installing zinc anodes at the discharge area successfully prevented the current discharge from the pipe. It might therefore be possible to operate the two CP systems separately.

Keywords: Cathodic protection, Stray current, Impressed CP system, Interference, Sacrificial anode, Prestressed concrete cylinder pipes
An existing impressed CP system of steel tanks was found to be interfering with newly installed zinc anodes of an adjacent Pre-stressed Concrete Cylinder Pipeline. The interference prevented the zinc anodes from providing protection current. The two protected structures are electrically bonded. Field measurements showed that some zinc anodes were providing current. Other anodes acted as if receiving current from the pipes. The latter was thought to be a cause of accelerated pipe corrosion (reversed circuit). The tank bottom plates were also found to have lost protection. In this paper, analysis of field data revealed that all of the zinc anodes in the vicinity of the tanks were picking up stray current. A mitigation measure was proposed to remove the existing resistive bond between the two structures and install a few zinc anodes at the discharge area. An experimental approach was undertaken to determine the effectiveness of this method by simulating the problem on a lab scale. Experimental measurements showed that installing zinc anodes at the discharge area successfully prevented the current discharge from the pipe. It might therefore be possible to operate the two CP systems separately.

Keywords: Cathodic protection, Stray current, Impressed CP system, Interference, Sacrificial anode, Prestressed concrete cylinder pipes
Product tags
Also Purchased
Picture for Interference between sacrificial CP systems
Available for download

51316-7797-Interference between sacrificial CP systems

Product Number: 51316-7797-SG
ISBN: 7797 2016 CP
Author: Tim Froome
Publication Date: 2016
$20.00
Picture for CP Interference - Interference Testing and Mitigation of Interference Issues
Available for download

51318-10656-CP Interference - Interference Testing and Mitigation of Interference Issues

Product Number: 51318-10656-SG
Author: Jeffrey L. Didas
Publication Date: 2018
$20.00

CP Interference and CP Influence and how the two differ. Both will be demonstrated by case histories and some solutions will be presented.
Picture for Combined Cathodic and Anodic Interference in Pipeline - An Analysis
Available for download

Combined Cathodic and Anodic Interference in Pipeline - An Analysis

Product Number: 51317--9004-SG
ISBN: 9004 2017 CP
Author: Rituraj Mishra
Publication Date: 2017
$20.00

In this paper exhaustive field study trials to monitor the pipe to soil potential over an extended time period and subsequent analysis of data has been discussed with reference to the critical Combined Cathodic and Anodic Interference phenomena observed on pipelines.
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