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SWG-2016-01075 - Transcontinental Gas Pipeline Company, LLC - Gulf of Mexico - Offshore

USACE Galveston District
Published May 2, 2023
Expiration date: 6/2/2023
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Public Notice          Project Plans

The applicant proposes to decommission-in-place the entire 10.7-mile length of pipeline known as segment 20125.  The applicant has stated that the proposed project would not result in either temporary or permanent impacts to the sea floor.  The applicant states that full removal of this pipeline segment would cause significant disturbance and ecological damage to the seafloor and would introduce an unnecessary safety risk to personnel involved in the removal operations.

In accordance with the Bureau of Safety and Environmental Enforcement 30 CFR 250.1750, pipeline decommissioning requirements, the applicant proposes to perform the following:  1) Disconnect from the previous service platform and subsea tie-in connection; 2) Flush the line by pigging and fill with seawater to equalize line pressure; 3) Plug each end of the pipeline; and 4) Cover each end with a protective concrete mat and confirm the depth of cover.

The proposed timeline for the decommissioning operations are expected to last approximately 7 days with equipment and personnel in the water for approximately 2 days at each end to disconnect from the two platforms.

A permit modification was previously approved by the Corps to decommission-in-place this segment on 20 July 2017 with a permit expiration on 31 December 2022, however the work was not initiated.