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Direct Current Voltage Gradient (DCVG) Surveys

Direct Current Voltage Gradient (DCVG) Surveys

Direct current voltage gradient (DCVG) surveys apply a DC signal to a pipeline and measure the resulting voltage gradient in the soil to precisely locate coating "holidays," or defects. DCVG is the only method available that can help approximate the size of a pipeline coating defect.
DCVG Survey
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In a DCVG survey, a direct current (DC) signal is applied to the pipeline, and the voltage gradient in the soil above the pipeline is measured. Voltage gradients, measured between two calibrated reference electrodes spaced apart, arise as a result of current pickup or discharge at pipeline coating holiday locations.

DCVG is known to be more precise in detecting coating holidays than other methods, such as the Pipeline Current Mapper. It’s also the only method available that can help approximate the size of a pipeline coating holiday.

Qualified MATCOR technical personnel conduct DCVG surveys in the field on oil, gas, and water pipelines. Data is then analyzed by AMPP-NACE certified experts.

Direct Current Voltage Gradient (DCVG) Surveys Key Benefits

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Why MATCOR Services?

MATCOR combines engineering expertise, proprietary products, and specialized installation capabilities to deliver corrosion protection solutions from design through commissioning and beyond.

One Partner, The Right Solution

Engineering, materials, installation, and more from the most techically capable team in the industry.

Leading Installation Capacity

Specialized equipment and dedicated construction crews ready to mobilize.

Engineering-Driven Approach

We don’t simply execute specs—we solve complex corrosion problems. 

50+ YEAR Quality & Safety RECORD

ISO 9001:2015 certified and backed by BrandSafway’s global resources.

Your AC mitigation and CP systems are only as good as the teams that design, install, and manage them. From engineering review through commissioning and annual surveys, here’s how MATCOR gets it right in the field.

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