Galvanic Cathodic Protection Sizing Calculator

Offshore & Marine Corrosion Engineering: Size sacrificial anode mass ($M$), quantity, circuit resistance ($R_a$), and current output per DNV-RP-F103.

Surface Area $A$ (m²):

Current Density $i_{des}$ (mA/m²):

Coating Breakdown Factor $f_c$:

Design Life $t_{life}$ (years):

Anode Material:

Electrolyte Resistivity $\rho$ (Ω·m):

Single Anode Net Mass (kg):

Anode Length $L$ (m):

Total Required Mass ($M_{tot}$)

-- kg

Count by Mass: -- anodes

Total Current Demand ($I_{tot}$)

-- A

Design Amp-Hours: -- kA·h

Recommended Anode Count

-- anodes

Governed by: Mass capacity

Single Anode Output ($I_a$)

-- A

Circuit Ra: -- Ω (Driving ΔE: -- V)

DNV-RP-F103 / NACE Sizing Rules:

• Anode mass requirement: $M = \frac{I_{tot} \cdot 8760 \cdot t_{life}}{\varepsilon \cdot u}$ where $u = 0.85$ is the utilization factor.

• Anodes must satisfy BOTH total electrochemical mass consumption AND end-of-life current output ($I_a = \Delta E / R_a$).

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