Allseas delivers Southeast Gateway Pipeline ahead of schedule

We completed our offshore pipelay commitments for the ambitious Southeast Gateway pipeline project in southeast Mexico. Installation of the 700-kilometre, 36-inch natural gas pipeline for our client, TC Energy, is a major success for Allseas, showcasing collaboration, cutting-edge technology and exceptional project management.

Dynamic project seamlessly executed
Leveraging our state-of-the-art pipelay vessels and dedicated onshore and offshore teams, we delivered the pipeline in 11 months. That included the complex nearshore scope and pre-commissioning of the entire system.

Solitaire laid most of the pipeline, with Lorelay and Tog Mor providing first-class support. Pioneering Spirit installed the outstanding nearshore section at Coatzacoalcos, without a stinger. Instead, the hanging stinger transition frame served as a ‘mini’ stinger, a solution tailored to the shallow water depth.

Project Manager Johan Paauwe says “Thanks to the great collaboration between the Allseas and TC Energy teams, we successfully navigated this dynamic project. The trust placed in us by our client fuelled our drive to deliver this ambitious pipeline, and once again demonstrate Allseas’ leadership in delivering complex, large-scale infrastructure projects efficiently, on time, and on budget.”

“The Southeast Gateway Pipeline Project, with much credit due to the performance of the collective Allseas/TC Energy team, is a classic example of how large scale offshore pipelay ventures are delivered safely, environmentally compliant, and on plan”, said Mike Bagale, TC Energy’s Vice President of Mexico Projects.

Driving efficiency and innovation
Our collaboration with TC Energy wasn’t just about execution – it was about raising the bar. TC Energy worked with us to advance the validation of our cutting-edge Automated Ultrasonic Testing system Dolphin, giving us a platform to showcase this industry-leading inspection technology. We obliged, inspecting more than 57,000 welds!

Dolphin’s fast, reliable and efficient inspection cycles set a new long overdue standard for the high production pipeline construction girth weld inspection. Successful deployment on Southeast Gateway underscores our commitment to innovation, safety and efficiency through continuous improvement of our vessels and equipment.

Thanks to Dolphin and our relentless focus on operational excellence, we delivered the pipeline ahead of schedule, helping TC Energy stay on track to achieve its commercial in-service date by mid-2025.

Powering Mexico’s future
This pipeline, a strategic collaboration between TC Energy and Mexico’s state utility CFE, will deliver reliable and affordable energy to Mexico’s growing southeast region. It builds on our legacy of excellence in Mexico, following our successful installation of the Sur de Texas-Tuxpan pipeline in 2017.