Cathodic Protection - Required Current
Required cathodic protection current for hull underwater area given current density and coating condition - screen ICCP / sacrificial anode sizing.
Protection current
84.5A
Formula, assumptions, and limits
Typical VLCC needs 250–400 A ICCP. Apply design margin of 25 % for tropic or fouling allowance. Anode mass from Q = I × t / capacity (Al-In ~2600 Ah/kg).
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Underwater area | m² | hydrostatics | |
| Current density | mA/m² | DNV-RP-B401 | |
| Temperature factor | - | seawater T |