Guidelines for Interpretation of Close Interval Surveys for ECDA

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• Direct Assessment
• External Corrosion

Main Objective

The primary objective is to develop guidelines that 1) improve prioritization of CIS indications, and 2) create more uniform CIS data interpretation. There is a need to establish an understanding of the CIS profile data beyond the existing interpretation of the off-potential values (in/out of compliance).

Public Abstract

Close interval surveys (CIS) are the most common tool employed during external corrosion direct assessment processes (ECDA) implemented in accordance with the NACE RP0502-02 Standard Recommended Practice "Pipeline External Corrosion Direct Assessment Methodology". The technique is well established, relatively simple to perform, and provides a significant amount of information with respect to the corrosion condition of a pipeline. CIS is typically one of the two indirect assessment techniques, which a pipeline operator would select per ECDA directives. Interpretation of CIS data is presently subjective and without a consensus view of how to prioritize indications. There is a need to establish an understanding of the CIS profile data in a more accurate and consistent manner that goes beyond the existing interpretation of the off-potential values (in/out of compliance with CP protection criteria stipulated in NACE RP0169). The proposed research effort focuses on providing a set of guidelines for pipeline operators to interpret CIS results for the purposes of prioritizing anomalies with regard to corrosion risks to pipeline integrity. The guidelines will enable the end users to improve prioritization of CIS indications and create more uniform CIS data interpretation following the indirect assessment step of the ECDA process. The research effort is co-funded by Southern California Gas

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