Welcome. This site is administered by the Pipeline and Hazardous Materials Safety Administration (PHMSA), and provides information regarding the Gas Transmission IM Rule (49 CFR Part 192, Subpart O). The "Gas IM Rule," as it is commonly referred to, became effective in February 2004, and represented a significant enhancement to PHMSA’s existing pipeline safety regulations.
Briefly put, the Gas IM Rule specifies how pipeline operators must identify, prioritize, assess, evaluate, repair and validate - through comprehensive analyses - the integrity of gas transmission pipelines that, in the event of a leak or failure, could affect High Consequence Areas (HCAs) within the United States. These HCAs include certain populated and occupied areas.
For an overview of the progress being made under the Gas IM Rule, please see our Performance Measures page. There you will also find a link to the tabulated semi-annual submissions provided by pipeline operators in accordance with this rule.
Other links on the left provide a great deal of additional information, including, among other things, an operator IM process flowchart and a fact sheet that summarizes key requirements of the Gas IM Rule; details of the rule itself; FAQs; and other information useful in more fully understanding the Gas IM Rule. This site is highly linked to assist users in locating information on a particular subject.
Continuing implementation of the Gas IM Rule sometimes results in rule revisions, new interpretations, or expanded clarifications. This site is updated as necessary to reflect these developments.
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