PHMSA issued a new Advisory Bulletin (ADB 26-06) to remind owners and operators of gas distribution systems of the distribution integrity management program (DIMP) requirements under 49 CFR part 192, subpart P. The guidance is intended to improve implementation of DIMP risk evaluations by addressing factors such as high-risk infrastructure, interactive threats, and leak management effectiveness. In addition, the guidance urges pipeline operators to adopt the most appropriate risk models for use within their integrity management programs, with full consideration of probabilistic risk models.
The Advisory Bulletin highlights recent updates to The Guide for Gas Transmission, Distribution, and Gathering Piping Systems (ANSI/GPTC Z380.1, 2022 edition) addressing interactive threats, system degradation over time, and leak investigation procedures. For a copy of the Advisory Bulletin or to inquire how RCP can support the review of your company’s DIMP risk assessment methodology, contact Jessica Foley.