Sacrificial Anode - Service Life
Service life of a sacrificial anode (Al-In or Zn) from mass, capacity, and protection current demand - bare-anode lifetime before replacement.
Anode life
49.47years
Formula, assumptions, and limits
Al-In typical 2600 Ah/kg; Zn 780 Ah/kg; Mg (fresh water only) 1230 Ah/kg. Hull anodes sized for 3–5 y (docking interval). Internal tank anodes 2–3 y.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Anode mass | kg | anode certificate | |
| Anode capacity | Ah/kg | DNV-RP-B401 | |
| Utilisation factor | - | DNV-RP-B401 |