Corrosion & Remaining Life (API 574) - Online Calculator

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⛽ Corrosion Rate / Remaining Life

API 510/570 basis: coupon weight loss · thickness measurement → corrosion rate → remaining life and next inspection interval

Calculation Method

Method

Coupon Weight Loss Parameters

Initial Weight W0 (g)

Final Weight W1 (g)

Area A (cm²)

Time t (h)

Density ρ (g/cm³)

Thickness Measurement Parameters

Original Wall Thickness (mm)

Current Wall Thickness (mm)

Interval ΔT (years)

Minimum Required Thickness (mm)

Notes

· Coupon weight loss CR = ΔW·87600/(A·t·ρ) mm/yr; thickness method CR=(t_orig−t_cur)/ΔT.

· Remaining Life RL=(t_min−t_cur)/CR; recommended next inspection = RL/2 (API 510/570 uses min(RL/2, 10 years)).

· Official judgment follows the Mechanical Integrity (MI) program.

Estimate in-service pipe corrosion rate and remaining life from original and measured wall thickness, with minimum required wall thickness.