Cathodic Protection Grid Survey


Your facility is the heart of your business and keeping it free from shutdowns and high maintenance costs will increase the safety of your people, profitability and help secure your company’s future.

Because plant piping networks are a complex maze of interconnects, using typical pipeline cathodic protection survey techniques will not provide actionable data. Corrpro utilizes a unique grid survey method to evaluate the effectiveness of a plant facility cathodic protection system, which also helps locate unintentional shorts, grounds and process piping interconnects so you can plan remediation activities before they progress to larger problems.

Grid Survey

The process uses computer-based data collection to gather pipe-to-soil potentials referenced to a specific point in the facility. Measurements are taken in a grid pattern and integrated into a geographic information system (GIS) for display in the format of a heat map.

A plant facility uses a network of buried piping and other buried structures, and surface soil potentials represent an averaging effect of all influences near the measurement point. It would be extremely challenging to draw conclusions from this data while viewing it in numeric format. However, displaying it as a heat map makes spotting anomalies easy.

Your facility is subdivided into an appropriate set of panels to allow the work to be completed in stages. Each test panel’s location and orientation within the plant are documented. While panel sizes can be different for different facilities, spacing between data collection points is always the same. This enables reassembly of multiple panels into a large map for the entire facility.

The survey can be completed with the cathodic protection system on, off or interrupted, depending on which information is most important. Thresholds are set and assigned specific colors to enable fast detection.

Everything is then graphically displayed in an easy to understand heat map for analysis.

  • Identify areas that do not demonstrate adequate cathodic protection.
  • Locate unintentional shorts, grounds and interconnects.
  • Select and prioritize plant locations for excavation and direct examination.



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Asset Integrity Management

Aegion provides Asset Integrity Management services for the world's pipeline systems.