Calculate remaining pipe wall thickness from original thickness and measured loss, determine average corrosion rate, and estimate future wall thickness.
How do I calculate remaining pipe wall thickness? Subtract measured wall loss from original thickness, or use the current measured thickness directly.
How is pipe corrosion rate calculated? Divide the wall thickness lost between two measurements by the time elapsed between those measurements.
Can I enter current measured thickness? Yes. This is the default mode and is usually the most direct way to use inspection data.
Can I enter wall loss instead? Yes. Switch the measurement method to original thickness plus measured wall loss.
Can this estimate future pipe thickness? Yes. Enter a future period and the calculator projects remaining wall using the calculated average corrosion rate.
What if the projected thickness becomes negative? The constant-rate mathematical projection has exceeded the available wall thickness. In practical terms, the pipe would reach zero thickness before the end of that projection and requires engineering evaluation.
Does this account for pitting? No. It calculates average wall loss. Localized pits can be significantly deeper than the average corrosion rate indicates.
Can this determine whether my pipe is safe? No. It is a calculation aid for inspection data. Minimum allowable thickness and fitness-for-service decisions require the applicable engineering criteria.