PHMSA Clarifies 24-Month Clock for Pipeline MAOP Restoration After Class Location Changes

The Department of Transportation's Pipeline and Hazardous Materials Safety Administration published a correcting amendment May 29 that adjusts the implementation timeline for one provision of its January 14 2026 final rule on pipeline class location changes.

The rule governs how operators of natural gas transmission pipelines respond when population density increases around an existing line and reclassifies the segment to a higher class location. It permits operators to confirm or restore the maximum allowable operating pressure using an integrity management alternative instead of the previous requirement to either reduce pressure or replace pipe.

The correction addresses only the MAOP restoration pathway.

Per the Federal Register notice, the 24-month deadline for completing the initial programmatic requirements of the integrity management alternative now runs from the later of the effective date of the final rule or the date the operator decides to initiate an MAOP restoration.

This aligns the restoration timeline with the parallel deadline for MAOP confirmations, which begins on the later of the final rule's effective date or the date of the class location change. The correction is effective May 29 2026.

The change affects operators of gas transmission pipelines subject to 49 CFR Part 192 who experience a class location change on segments eligible for the integrity management alternative. The original final rule carried regulation ID number 2137-AF29 and was issued after notice-and-comment rulemaking.

Downstream, pipeline operators must now track two distinct start dates for the same 24-month compliance window depending on whether they choose confirmation or restoration. Those selecting restoration gain additional time if they delay the decision to restore pressure.

The clarification eliminates ambiguity that could have triggered compliance disputes or enforcement actions once the original January 2026 rule took effect. No new comment period applies; the correction stands as a final agency action. Congressional review periods under the Congressional Review Act begin from the May 29 publication date.

This is the first technical correction to the January 14 2026 class location rule. The underlying final rule replaced a decades-old prescriptive approach that required either pressure reduction or pipe replacement with a performance-based integrity management option.