Impressed Current Cathodic Protection (ICCP) Calculator
Determine pipeline total protective current demand (Amps), Dwight anode groundbed resistance (Ohms), and rectifier DC voltage per NACE SP0169 standards.
Pipeline & Coating Parameters
3LPE end of life ≈ 2% to 4% bare
Cathodic Sizing & Rectifier Results
Total Current Demand (I_total):
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Rectifier Output Voltage (V_dc):
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Groundbed Resistance (R_ground):
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Total Pipeline Surface Area:
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Standard Rectifier Size:
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Anode Discharge Current:
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NACE SP0169 Cathodic Protection Engineering
Cathodic protection prevents electrochemical oxidation of buried steel pipelines by polarizing the steel pipe to a minimum negative potential of $-850 ext{ mV}$ (instant-off) or $-1,000 ext{ mV}$ (with IR drop) relative to a copper/copper sulfate reference electrode ($CSE$).
H.B. Dwight Paralleled Groundbed Resistance Equation
R_v = (ρ / 2πL) · [ ln(8L / d) - 1 ] R_bed = (R_v / N) + (ρ / 2πSN) · ln(0.656 · N)