John Peter Nicholson, Eurocorr 2010
With today’s electronic instrumentation, it is possible to combine close interval potential surveys (CIPS) with direct current voltage gradient surveys (DCVG) of buried and underwater pipelines for improved accuracy in assessing the level of cathodic protection combined with locating coating defects without spatial errors.
Elizabeth Nicholson, B. Eng, Poland 2010
Stray currents can impact the ability to protect a pipeline or other buried metallic structure from corrosion. They can be generated from a variety of manmade and natural sources. Common sources of stray currents are cathodic protection on other lines, DC transit systems and telluric activity.
Peter Nicholson,NACE Corrosion 2008 Conference & Expo , Paper No. 08123
Traditionally, close interval potential surveys (CIPS) and direct current voltage gradient surveys (DCVG) have been undertaken separately and the corrosion engineer has been saddled with the task of trying to correlate the results of these surveys, to assess the level of cathodic protection on the pipeline and the effect of coating holidays on the effectiveness of the cathodic protection system.
J. Peter Nicholson , World Pipelines Nov 2007
Corrosion is a leading cause of pipeline failures; it is reported that nearly 30% of all pipeline failures in a 30 year period 1971 and 2001 in Europe where due to external corrosion of underground or underwater pipelines. Leaks due to corrosion of pipelines result in huge economic losses and damage to the environment and can result in loss of life.
Peter Nicholson, Pipeline Rehabilitation & Maintenance, September 2006
All underground/underwater metallic pipelines are subject to corrosion where there are inadequate levels of cathodic protection. Cathodic protection is the only method of reducing or halting external corrosion on underground/underwater pipelines.
J. Peter Nicholson, World Pipelines, March 2003
Cathodic protection is an electrical method of reducing the corrosion rate of buried or submerged metallic structures, such as a pipeline. Since cathodic protection requires the flow of electrical current through the soil and onto the pipeline, chemical changes occur at the pipeline soil interface.