Understanding Corrosion in Water Pipelines: A Guide for Pipeline Designers


Pearson Survey

Last updated: October 3, 2017

What Does Pearson Survey Mean?

The Pearson survey is a widely accepted method to precisely trace electrical contact points as well as insulating coated pipeline joints. It may be performed on pipelines with coating in any location.

This technique works by following the direction of audio frequency or impressed current in coated pipelines and identifying the exit points. This survey is regarded as a practical way to interpret and gauge findings in a quick and accurate manner.


Corrosionpedia Explains Pearson Survey

The Pearson survey is a survey method that was developed by J.M. Pearson. It is capable of providing professionals, such as engineers and other skilled personnel, the ability to perform the following:

  • Locate the position of structures, cables and metallic pipelines
  • Determine the depth of structures
  • Detect faults in corrosion protection coating
  • Determine the location and extent of electric contact between pipelines

One advantage in utilizing the Pearson survey is that it is highly effective in tracing discontinuities or damage in buried pipelines’ coating, as well as loose electrical contacts and their exact site on the pipe, allowing the prevention of major failures. However, users should ensure that the pipelines are backfilled and the surrounding soil is compact and contains some moisture.

Through this survey, corrosion on buried structures can be prevented early on by ensuring that the cathodic protection in use is established and still effective. It must be noted that the reliability of gas and oil pipelines can be guaranteed through the deployment of surveys as well as the utilization of refined software and hardware.


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