DCVG (Direct Current Voltage Gradient) is a non-invasive method for assessing the effectiveness of corrosion protection on buried steel structures, particularly pipelines. This technique relies on the principle that any defects in the protective coating surrounding a buried pipeline will allow current to flow from the surrounding soil to the metal surface, establishing voltage gradients in the soil. By measuring these voltage gradients using a DCVG meter, the location and severity of coating defects can be accurately identified.

DCVG surveys are essential for maintaining the integrity of critical infrastructure like pipelines, ensuring the safety and longevity of these vital assets. By proactively detecting and addressing coating defects, DCVG helps prevent corrosion-related failures that could lead to leaks, spills, and environmental hazards.