Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

Cathodic Protection Coupon Use for Buried Piping in Plant (i.e. Complex) Facilities

Picture for Cathodic Protection Coupon Use for Buried Piping in Plant (i.e. Complex) Facilities
Available for download

Measurement and interpretation of cathodic protection data in plant facilities present challenges where mixed metals are electrically continuous with the protected structure. This paper address some of the confusion and important aspects when using coupons for buried piping in mixed-metal circuits.

Product Number: 51317--8824-SG
ISBN: 8824 2017 CP
Author: Douglas Gilroy
Publication Date: 2017
Industry: Cathodic Protection
$0.00
$20.00
$20.00

The measurement and interpretation of cathodic protection (CP) data in plant (i.e. complex) facilities present inherent challenges where mixed metals are electrically continuous with the protected structure. Often there is no attempt to electrically isolate the on-plot buried steel piping networks from the facility for safety and practical considerations. Coupons can be used to assist in the evaluation of CP levels on buried steel piping in mixed-metal circuits. However the present industry practice of disconnecting the coupon from the mixed-metal circuit to measure the potential and polarization as described in NACE SP0104-2014 and BS EN 14505:2005 raises concern if the instant-disconnect condition is a true representation of the CP conditions. Another common practice of not interrupting the CP current while measuring coupon-to-soil potentials is also a concern where closely coupled impressed current anode systems are installed adjacent to the buried piping systems. Alternate criteria are often necessary in situations where the polarized -850 mV CSE potential criterion is impractical because of the impact of the buried copper grounding system and other bare metallic structures. Coupons can be used to take advantage of the alternate criteria listed in NACE SP0169-2013 and BS EN 14505:2005. Although coupons provide valuable information in mixed-metal circuits the data obtained can increase confusion and raise additional questions on the protection status. This paper attempts to address some of the confusion and highlights important aspects when using coupons for buried piping in mixed-metal circuits. Keywords: coupons mixed-metal circuits cathodic protection piping criteria

The measurement and interpretation of cathodic protection (CP) data in plant (i.e. complex) facilities present inherent challenges where mixed metals are electrically continuous with the protected structure. Often there is no attempt to electrically isolate the on-plot buried steel piping networks from the facility for safety and practical considerations. Coupons can be used to assist in the evaluation of CP levels on buried steel piping in mixed-metal circuits. However the present industry practice of disconnecting the coupon from the mixed-metal circuit to measure the potential and polarization as described in NACE SP0104-2014 and BS EN 14505:2005 raises concern if the instant-disconnect condition is a true representation of the CP conditions. Another common practice of not interrupting the CP current while measuring coupon-to-soil potentials is also a concern where closely coupled impressed current anode systems are installed adjacent to the buried piping systems. Alternate criteria are often necessary in situations where the polarized -850 mV CSE potential criterion is impractical because of the impact of the buried copper grounding system and other bare metallic structures. Coupons can be used to take advantage of the alternate criteria listed in NACE SP0169-2013 and BS EN 14505:2005. Although coupons provide valuable information in mixed-metal circuits the data obtained can increase confusion and raise additional questions on the protection status. This paper attempts to address some of the confusion and highlights important aspects when using coupons for buried piping in mixed-metal circuits. Keywords: coupons mixed-metal circuits cathodic protection piping criteria

Product tags
Also Purchased
Picture for Cathodic Protection and MIC - Effects of local electrochemistry
Available for download

Cathodic Protection and MIC - Effects of local electrochemistry

Product Number: 51317--9452-SG
ISBN: 9452 2017 CP
Author: Stefan Jansen
Publication Date: 2017
$20.00

The goal of this research was to improve the understanding of the mechanisms of cathodic protection (CP) by determining the interactions between corrosion and local chemical parameters, such as pH, under varying CP conditions, both in the absence and presence of MIC.
Picture for Can an Intermittent Cathodic Protection System Prevent Corrosion of Buried Pipeline?
Available for download

Can an Intermittent Cathodic Protection System Prevent Corrosion of Buried Pipeline?

Product Number: 51317--9353-SG
ISBN: 9353 2017 CP
Author: Marco Ormellese
Publication Date: 2017
$20.00

In this paper, a preliminary study of the effect of intermittent CP has been carried out in order to investigate the effect of a temporary current interruption on the potential monitoring and on the residual corrosion of the metal.

 
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