CP potential measurement - steel is protected when its potential vs Ag/AgCl reference electrode is between −800 mV and −1100 mV.
Formula
$$ -1100 \text{ mV} \leq V_\text{steel vs Ag/AgCl} \leq -800 \text{ mV} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V$ | Potential vs Ag/AgCl reference | mV | reference-electrode probe |
Sources
- DNV-RP-B401.
- NACE SP0176 - CP offshore steel.