How do I determine the spacing Galvashield anodes around a patch?

Anode spacing is based upon the surface area of the steel to be protected. The greater surface area of steel the closer the anodes should be spaced. A data sheet with examples of steel density calculations may be downloaded on the appropriate web page. Once steel density is calculated one would utilize the chart on the data sheet to determine the spacing for typical conditions. For more aggressive conditions or longer service life the spacing should be modified as appropriate.