Menu
Search
Filters
Close
Menu

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

51317--9722-The Use of Ultrasound for Monitoring the Impact of Induced AC Corrosion on Underground Structures

Picture for The Use of Ultrasound for Monitoring the Impact of Induced AC Corrosion on Underground Structures
Available for download

An alternative method for directly measuring effectiveness of AC-induced corrosion control and mitigation efforts. This method takes the form of traditional coupons imbedded with ultrasound testing (UT) transducers designed to directly measure and track coupon metal loss and related corrosion-induced anomalies.

Product Number: 51317--9722-SG
ISBN: 9722 2017 CP
Author: Rob Leary
Publication Date: 2017
Industry: Energy Generation
$0.00
$20.00
$20.00

The Use of Ultrasound for Monitoring the Impact of Induced AC Corrosion on Underground StructuresIt is generally accepted that Alternating Current (AC) corrosion on cathodically-protected underground structures is the result of the combined action of induced AC voltage local cathodic protection conditions chemical and physical conditions of the soil. Indeed NACE standards and guidelines exist related to AC voltages and current density thresholds that are established to protect both personnel and underground structures such as pipelines. As a result the industry is developing an understanding of how to best mitigate and monitor such risks. One of the most widely accepted monitoring methods is tracking the current density rather than just AC voltages through the use of coupon test stations installed adjacent to the structures requiring protection. Coupons are typically installed to measure and monitor induced AC potentials and current densities that are compared to levels known to produce corrosive effects. Such data are combined with other pipeline design/installation parameters and high voltage AC performance parameters in order to yield information for mitigating and preventing AC corrosion. The industry has depended on the use of these analytical and indirect methods and tools for measuring the effectiveness of mitigation efforts. However there is a need for better methods to measure mitigation efforts and determine when corrosive conditions exist. This paper presents an alternative method for directly measuring the effectiveness of induced AC corrosion control and mitigation efforts. This method takes the form of traditional coupons imbedded with ultrasound testing (UT) transducers designed to directly measure and track coupon metal loss and related corrosion-induced anomalies. Rather than managing some of the challenges of electrical resistance or electrical-chemical measurement techniques ultrasound is used to directly measure coupon thickness on any required schedule – manually or remotely. The UT-based coupons are integrated into traditional cathodic protection test stations the results of which are combined with traditional AC and DC current density measurements for more accurate and repeatable tracking of the mechanical integrity of underground structures as well as cathodic protection system performance. Early testing results and the performance of field installations are presented.

Key words: Alternating current, cathodic protection, corrosion, ultrasound, coupons

The Use of Ultrasound for Monitoring the Impact of Induced AC Corrosion on Underground StructuresIt is generally accepted that Alternating Current (AC) corrosion on cathodically-protected underground structures is the result of the combined action of induced AC voltage local cathodic protection conditions chemical and physical conditions of the soil. Indeed NACE standards and guidelines exist related to AC voltages and current density thresholds that are established to protect both personnel and underground structures such as pipelines. As a result the industry is developing an understanding of how to best mitigate and monitor such risks. One of the most widely accepted monitoring methods is tracking the current density rather than just AC voltages through the use of coupon test stations installed adjacent to the structures requiring protection. Coupons are typically installed to measure and monitor induced AC potentials and current densities that are compared to levels known to produce corrosive effects. Such data are combined with other pipeline design/installation parameters and high voltage AC performance parameters in order to yield information for mitigating and preventing AC corrosion. The industry has depended on the use of these analytical and indirect methods and tools for measuring the effectiveness of mitigation efforts. However there is a need for better methods to measure mitigation efforts and determine when corrosive conditions exist. This paper presents an alternative method for directly measuring the effectiveness of induced AC corrosion control and mitigation efforts. This method takes the form of traditional coupons imbedded with ultrasound testing (UT) transducers designed to directly measure and track coupon metal loss and related corrosion-induced anomalies. Rather than managing some of the challenges of electrical resistance or electrical-chemical measurement techniques ultrasound is used to directly measure coupon thickness on any required schedule – manually or remotely. The UT-based coupons are integrated into traditional cathodic protection test stations the results of which are combined with traditional AC and DC current density measurements for more accurate and repeatable tracking of the mechanical integrity of underground structures as well as cathodic protection system performance. Early testing results and the performance of field installations are presented.

Key words: Alternating current, cathodic protection, corrosion, ultrasound, coupons

Product tags
Also Purchased
Picture for Review of Recent Developments in Induced AC Current Corrosion Mitigation Design Materials Installation
Available for download

51317--9711-Review of Recent Developments in Induced AC Current Corrosion Mitigation Design Materials Installation and Monitoring Technologies

Product Number: 51317--9711-SG
ISBN: 9711 2017 CP
Author: Todd Sirola
Publication Date: 2017
$20.00

The issue of induced AC current corrosion and its mitigation for buried pipelines continues. A review of the design methods and mitigation technologies used in the past, and those recently developed and continue to evolve, to meet the AC mitigation challenges faced by buried pipeline operators.

 
Picture for Corrosion Looping for Down Stream Petroleum Plants: An Enigma for RBI Engineers A Perspective From
Available for download

Corrosion Looping for Down Stream Petroleum Plants: An Enigma for RBI Engineers A Perspective From the Review of Mechanical Integrity Systems

Product Number: 51317--9178-SG
ISBN: 9178 2017 CP
Author: Muazu Mohammed
Publication Date: 2017
$20.00

A review of the issues in the implementations of Risk Based Inspection (RBI) system for refineries and petrochemicals - to simplify and harmonize corrosion loops (as captured on Process Flow Diagrams (PFDs)) and corrosion circuits as captured in piping and instrumentation diagrams (P&IDs).
Picture for Risk Analysis for Assessing AC Corrosion in Trasnmission Pipelines
Available for download

51317--9786-Risk Analysis for Assessing AC Corrosion in Trasnmission Pipelines

Product Number: 51317--9786-SG
ISBN: 9786 2017 CP
Author: Alfonso Garcia Rojas
Publication Date: 2017
$20.00

Expansion has increased the risk of AC in pipelines. In this work, calculations of induced AC voltage and current are performed for scenarios involving: HVAC transmission powerline configuration, lateral distance to the transmission pipeline, and parallelism between the transmission lines, soil, and pipeline and coating properties. 

 
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