PR-430-173869-R01 Guideline for Integrity Assessment of Difficult to Inspect Pipelines

Abstract

Pipeline operators apply inspection methods and technologies for the purposes of assessing, or providing confidence in, the operational integrity of pipeline systems. In-line inspection (ILI), hydrostatic testing, and Direct Assessment (DA) methods are well-established and heavily relied upon by the industry; however, as additional technologies and methods continue to be developed and advanced, a structured process is needed for guidance in application of other methods. This document was developed for use by pipeline operators and service companies as a technology independent framework in the planning and execution of pipeline integrity assessments. This guidance presents requirements for any inspection process including qualification, validation, and development of a performance specification. It should be noted that these elements are required in application of any inspection method; in this regard, any established inspection method could be applied using the principles in this guideline. This guideline was thus created with many similar components as established standards and procedures for inspections such as API 1163 In-Line Inspection Systems Qualification and NACE SP-0502-2010 Pipeline External Corrosion Direct Assessment Methodology. This work was accomplished through collaboration with PRCI pipeline operating members to learn the steps each use to justify equivalent understanding of line pipe for other technologies. The criteria used to justify the established pipeline integrity technologies in their development (e.g. ILI, DA, RSTRENG) were also reviewed. This project reports the instances in the public record of pipeline operator notifications to PHMSA for application of other technologies and the criteria, both current and past, used to justify equivalent understanding. There is a related webinar.