All measurement systems contain error, including measurements of corrosion pit sizes made by ILI tools. Such measurements can be evaluated statistically using expected or field-quantified ILI tool error in order to determine the probability that a flaw of any indicated size could exceed a size of concern or requiring repair. We refer to such an evaluation as ‘Probability of Exceedance” or POE.
Uses for a POE analysis include:
- Determining how many digs must be performed to reduce probability of failure below a threshold;
- Establishing flaw-size response criteria based on probability of failure.
- Projecting how probability of failure increases over time at a given corrosion rate;
- Determining how many repair digs must be performed to maintain risk at or below a threshold;
- Evaluating whether a pipeline segment should be repaired on an anomaly-by-anomaly basis, be rehabbed, or be replaced.
With over 20 years of experience, Kiefner has the expertise to support your In-line Inspection qualification needs.
