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Corrosion Rate & Remaining Life Calculator

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Corrosion Rate & Remaining Life Calculator

Corrosion Rate & Remaining Life Calculator

?

Baseline Data

Intermediate Measurements

Current & Limits

Active Corrosion Rate ?
0.000 mm/yr
LT: 0.00 | ST: N/A
Estimated Remaining Life
0.0 Years
Based on active rate
Total Metal Loss
0.00 mm
Est. Retirement Date
--
Enter inspection data to calculate rates.

Inspection Planning Margins

  • Half-Life (50%) --
  • Warning (75%) --
  • Critical (90%) --

Dates indicate when the respective percentage of remaining life will be consumed. Use these to plan Next Inspection Dates.

Thickness Projection

Date Est. Thickness Status

Corrosion Management Notes

API 570 / 510 Methodology
  • Long-Term (LTCR): Rate measured from baseline thickness to current. Good for smoothing out minor measurement errors.
  • Short-Term (STCR): Rate measured from previous inspection to current. Good for catching sudden operational changes causing aggressive corrosion.
  • Industry standard often uses the higher of LTCR or STCR for safer projection.
Common Corrosion Types
  • Uniform: Even metal loss. This calculator best predicts uniform corrosion.
  • Localized / Pitting: Aggressive, concentrated loss. Harder to predict linearly.
  • CUI (Under Insulation): Often hidden, requires specialized inspection intervals regardless of calculated general rates.
Inspection Best Practices
  • Always measure from the exact same Condition Monitoring Locations (CMLs).
  • Calibrate UT equipment before every use.
  • A remaining life of < 10 years usually dictates a half-life inspection interval (50% margin).