PR-719-223803-R01 API 1163 Performance Validation Guidelines

The main purpose of this project is to provide technical guidance for the practical implementation of the measurement performance validation methodologies outlined in the API RP 1163 2021 Edi- tion (API 1163-2021), which include three levels of validation:

• Level 1: The vendor specification is used to define measurement performance with little or no field validation. This level typically applies to ILI systems that have been proven in the past on pipelines that have previous ILI baselines for comparison.

• Level 2: The vendor specification is tested against field-measured anomalies by calculating a binomial confidence interval on the ratio of anomalies within specification to the total number of inspected anomalies. The interval endpoints are used to define three outcomes.

• Level 3: The as-run performance of the ILI-tool is calculated from validation field meas- urements using statistical methods. The calculated performance can then be used in-place of the vendor specification in subsequent integrity and risk analyses.

This project developed guidelines for each validation level and produced a Microsoft Excel spread- sheet tool that calculates and plots the validation results in a way that is reflective of these guide- lines. The scope of these guidelines and spreadsheet tool includes the validation of ILI perfor- mance for detection (probability of detection, POD), anomaly type identification (probability of identification, POI, and probability of misidentification, POMI), and sizing accuracy. Anomalies considered within scope of these guidelines include metal loss and crack anomalies.