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)? Illustration EL-0090
• Impressed current cathodic protection (ICCP) depends on the electrical resistance of seawater between anodes and hull. • Seawater resistivity changes mainly with temperature and salinity, which affect the current needed for proper protection. • Vessel speed influences flow and erosion, but consider whether it significantly changes the electrical circuit between anodes, reference electrodes, and hull.
• For each factor (temperature, salinity, speed), ask: does this change the conductivity of the electrolyte (seawater) enough to alter hull potential? • Think about what the reference electrode voltmeter is actually measuring in the diagram and which environmental changes would shift that reading. • Which of the listed changes are more gradual environmental conditions versus more operational/short‑term conditions?
• Identify which factors most strongly affect seawater conductivity / resistivity around the hull. • Consider whether a change in ship speed alone would change the hull-to-electrolyte potential the reference electrode sees. • Verify that the chosen option consistently treats the same factors as either requiring or not requiring a hull-potential recheck (no internal contradictions).
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