Menu
Search
Filters
Close
Menu

09132 DCVG – Analysis of Practical Limits and Suggestions for Improvements

Picture for 09132 DCVG – Analysis of Practical Limits and Suggestions for Improvements
Available for download
Product Number: 51300-09132-SG
ISBN: 09132 2009 CP
Author: Peter-John Stehouwer, Leslie Bortels, Kees Dijkstra
Publication Date: 2009
$0.00
$20.00
$20.00
Failures in oil or gas pipelines can have severe environmental and economic consequences. Therefore, large investments have been made in studies on corrosion prevention for buried and submerged pipes. Important research is being conducted to determine and predict corrosion mechanisms in the electrolyte and to develop effective protection techniques for buried and submerged metallic structures.

Protective coatings offer a first barrier against corrosion. However, damage of the coating duringinstallation and coating degradation can result in severe corrosion and necessitate the installationof properly designed cathodic protection (CP) systems. When designing a cathodic protectionsystem, the aim is to obtain a pipe-to-soil potential (P\S) along the entire length of the pipelinenetwork that is more negative than a certain minimum protection level [1]. This is achieved bydriving sufficient protective current in the electrolyte (soil, seawater, …) that mainly flowstowards coating defects exposing bare steel. The resulting voltage gradients in the electrolyte canbe measured at the surface and are the common basis for several coatingsurvey techniques.
Failures in oil or gas pipelines can have severe environmental and economic consequences. Therefore, large investments have been made in studies on corrosion prevention for buried and submerged pipes. Important research is being conducted to determine and predict corrosion mechanisms in the electrolyte and to develop effective protection techniques for buried and submerged metallic structures.

Protective coatings offer a first barrier against corrosion. However, damage of the coating duringinstallation and coating degradation can result in severe corrosion and necessitate the installationof properly designed cathodic protection (CP) systems. When designing a cathodic protectionsystem, the aim is to obtain a pipe-to-soil potential (P\S) along the entire length of the pipelinenetwork that is more negative than a certain minimum protection level [1]. This is achieved bydriving sufficient protective current in the electrolyte (soil, seawater, …) that mainly flowstowards coating defects exposing bare steel. The resulting voltage gradients in the electrolyte canbe measured at the surface and are the common basis for several coatingsurvey techniques.
Product tags
Also Purchased
Picture for ACVG or DCVG - Does it Matter?
Available for download

ACVG or DCVG - Does it Matter?

Product Number: 51317--9374-SG
ISBN: 9374 2017 CP
Author: Jim Walton
Publication Date: 2017
$20.00

This paper will point out when and why to use either Direct Current Voltage Gradient (DCVG) or Alternating Current Voltage Gradient (ACVG) surveys, including what the criteria of percent IR and Decibel microvolt (dBµV) really mean when conducting these survey techniques.

 
Picture for 07181 Combined CIPS and DCVG Surveys for Improved Data Correlation
Available for download

07181 Combined CIPS and DCVG Surveys for Improved Data Correlation

Product Number: 51300-07181-SG
ISBN: 07181 2007 CP
Author: J. Peter Nicholson
Publication Date: 2007
$20.00
Picture for Improvement to Cathodic Protection Performance using DCVG Prioritization
Available for download

51316-7091-Improvement to Cathodic Protection Performance using DCVG Prioritization

Product Number: 51316-7091-SG
ISBN: 7091 2016 CP
Author: Chukwuma Onuoha
Publication Date: 2016
$20.00

This paper will show improvements in interpretation of direct current voltage gradient % IR and how accurate selection of pipeline coating rehabilitation location based on this concept would lead to improvements in cathodic protection performance. Case studies from previous external corrosion direct assessment digs will be presented.
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