ADVANTAGES OF THE ANALOGUE DCVG.

Accurate location of coating fault (to within 10 cm circle).

Accurate location of a pipeline that has Coating Faults (within 10 cm).

Possible to determine Coating Fault Severity from electrical measurements at DCVG epicentre to remote earth. Severity is related to size but can be dominated by other factors such as pH effects.

Intimate examination of pipeline right of way possible during DCVG survey as complete route walked.

Possible to determine if steel exposed at a Coating Fault receives enough CP current for protection.

Possible to determine if current leaving a Coating Fault (a corrosion process) as occurs in DC Traction Interference.

Possible to determine which Coating Faults are picking up DC Traction Currents.

Possible to determine where a Coating Fault getting it�s CP Current from.

Sensitivity of a Coating Fault to a Rectifier being inoperative can be determined.

Possible to adjust Rectifier settings and confirm Coating Fault receiving enough CP Current for protection.

Possible to determine the effective range (throw) of a CP Rectifier (or other CP power source).

Technique can be used in any combination of electrolytes such as soil, river water, sea water, and ice/snow.

Technique can be used with all types of coating (Tape, Coal Tar, FBE etc.) including Thermally Insulated coatings.

Orientation of Coating Fault around pipe can be identified for larger pipe diameters.

It is possible to determine before excavation the approximate shape of the coating damage.