Cathodic Protection

Mass consumption rate from anode current and electrochemical capacity.

Anode current from driving voltage and circuit resistance.

Consumed-life estimate from mass, capacity, utilization, and current.

Resistivity of one depth interval from two successive Wenner measurements.

Layer resistances and resistivities from successive Wenner measurements.

How much conductor that resistance represents — leftover on a spool, or length of a linear-anode header.

Conductor resistance from resistivity, length, and cross-sectional area.

Bare and coated area from total area and coating breakdown fraction.

Convert between conductivity and resistivity.

Idealized uniform-corrosion penetration rate from Faraday’s law and current density.

Uniform penetration rate from coupon mass loss, density, area, and exposure time.

Signed and absolute shift between native and polarized pipe-to-soil potentials.

Current density from current and exposed or active area.

Signed difference between ON and instant-off potentials.

Convert between voltage, current, and power for a DC, PoE, or unity-PF load.

Solve for voltage, current, resistance, or power from any two of the four.

Annular metal cross-sectional area from outside and inside diameters.

External cylindrical surface area of a pipe (no end caps).

Display a pipe-to-soil reading with an optional labeled reference correction.

Change between a previous and current pipe-to-soil reading.

Current ratio and loss between an upstream and downstream measurement.

Required current from exposed surface area and current density.

Resistance per unit length of the pipe metal from electrical resistivity and metal cross-section. Not soil resistivity or coating conductance.

Total metal resistance of a pipeline from linear resistance and length.

Effective operating circuit resistance from DC voltage and current. For a shunt millivolt rating, use Shunt Value.

Convert between rectifier DC voltage, current, and power.

DC output power as a fraction of AC input power.

Convert a measured potential between Cu/CuSO4, Ag/AgCl, SCE, and zinc so you know the target on each electrode.

Current from measured shunt voltage and known shunt resistance.

Shunt resistance from measured voltage and current.

Shunt measurement from millivolt drop and current. Same Ohm’s-law math as Rectifier Circuit Resistance, labeled for shunt work.

Voltage drop across a shunt from current and resistance. Display in mV or V.

Anode-to-electrolyte resistance of a single vertical cylindrical anode.

Calculate voltage drop or IR drop from current and resistance.

Apparent soil resistivity from a Wenner four-pin measurement.