Referring to the impressed current cathodic protection system shown in the illustration, if required to control the current to the anodes manually by using the hand adjustment potentiometer, what statement best represents the changes that should prompt one to recheck the reference electrode voltage (hull potential)? EL-0090

Correct Answer: Option A — Changes in vessel speed, sea water temperature, and sea water salinity should all prompt rechecking.

Seawater temperature, salinity, and vessel speed directly alter electrical resistivity and polarization kinetics at the hull-water interface. These operational variables change current demand, necessitating periodic manual rechecks and adjustments of the reference electrode hull potential.