What is a special concern for deep anode beds?

Focusing on the concern regarding deep anode beds, gas blockage due to tight soils is a significant issue. When anodes are installed at a greater depth, especially in soils that are compacted or low in permeability, gas generated during the electrochemical reactions can become trapped. This buildup of gas creates a barrier that can hinder the effective functioning of the cathodic protection system, limiting the current flow and reducing the overall efficiency of corrosion protection for the structure being protected.

This phenomenon becomes particularly critical when dealing with deep installations because the potential for gas accumulation increases as the enclosed volume of soil above the anodes may restrict the escape of gases. Proper design and monitoring are essential to ensure that there is adequate venting or means to mitigate this risk, as high levels of gas can lead to reduced effectiveness of the cathodic protection system and could necessitate maintenance or remedial actions.