Typical cathodic-protection current-density requirement for uncoated vs coated steel in sea water per DNV-RP-B401.
Formula
$$ I = i_\text{uncoated} \cdot A_\text{uncoated} + i_\text{coated} \cdot f_b \cdot A_\text{coated} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $i$ | Current density per m² | mA/m² | DNV-RP-B401 |
| $f_b$ | Coating breakdown factor | - | coating age |
| $A$ | Submerged area | m² | hull form |
Sources
- DNV-RP-B401 - CP design.