New Visions for CIPS and DCVG

New instrumentation technology in the pipeline survey industry has helped produce and deliver results for the pipeline surveyor, analyst, and operator.   Elizabeth Nicholson, Cathodic Technology, Ltd.   As pipeline survey data increase with the use of close...

Notes From A Napkin in Shanghai- World Pipeline May 2017

Elizabeth Nicholson, Matthew Bechberger and Patrick Yaremko of Cathodic Technology Ltd. Canada, review the process of developing a new cathodic protection survey instrument from concept to market. Read Article   After a successful NACE conference in 2011, in a...

NACE 2017 New Orleans

Cath-Tech are proud to exhibit at the NACE 2017 Annual Corrosion Conference & Expo in New Orleans, LA., the world’s largest corrosion conference and exposition.  Each year NACE welcome more than 6,000 corrosion engineers,...

A Fuzzy Logic Model Designed for Quantitative Risk Analysis based on ECDA Data

Elizabeth Nicholson, Corrosion 2015, Paper 5675

Describes a fuzzy logic model intended for quantitative risk analysis to the integrity of buried pipelines. The proposed approach correlates data from combined CIPS+DCVG coating surveys to the soil resistivity, in order to define an indicator that expresses the corrosion susceptibility at a given coating defect location. Inputs used in the mathematical model include: DCVG defect severity, CIPS pipe-to-soil “OFF” potentials and local soil electrical resistivity

Pipeline Integrity: Combining Coating Integrity and Cathodic Protection Surveys

Elizabeth Nicholson, Corcon 2014 Corrosion Conference & Expo, Mumbai

Many types of surveys are done to allow the operator to assess the condition of a pipeline.  Two surveys are essential to any pipeline integrity management program, coating integrity and cathodic polarization.  Coating integrity is investigated by generating a pulse on the pipeline, then walking the pipe to locate any voltage gradients in the soil. 

Two Halves of a Whole: Coatings and Cathodic Protection


Coatings prevent corrosion by creating a barrier between the structure and the electrolyte.  Cathodic protection works by changing the potential of the structure to interfere with the corrosion process.  Both work together to protect the structure.  Surveys can be done to evaluate the condition of the coating and of the cathodic protection. 

Stray Current Detection and Correction

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.

Is Your Pipeline Corroding?

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.

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