Allseas Wins Subsea Pipelay Contract for BC's PRGT-Ksi Lisims LNG Link
Western LNG has awarded offshore contractor Allseas the installation contract for the critical subsea section of the Prince Rupert Gas Transmission (PRGT) pipeline, Pipeline Technology Journal reports.
Project Scope
The award covers the final segment of a 700-kilometer (435-mile) pipeline system designed to move Canadian natural gas from interior production fields to the planned Ksi Lisims floating LNG export facility on Pearse Island, near the Alaska border. Allseas’ scope includes laying roughly 50 kilometers (31 miles) of concrete-weight-coated pipe ranging from 36 to 48 inches in diameter, connecting the onshore transmission network to the offshore terminal.
Offshore installation is scheduled to begin in 2029. Allseas will deploy its pipelay vessels Solitaire and Sandpiper to work across varied seafloor conditions, with operations extending from shoreline entry points to depths of nearly 450 meters (1,475 feet). The scope includes multiple shore pull-ins, above-water tie-ins, pre- and post-lay span rectification, trenching, and seafloor stabilization work to protect the line against strong coastal currents. Western LNG says it selected Allseas based on the company’s track record handling complex subsea installations in harsh offshore environments, using proprietary in-house design and construction technology.
What It Means for Subcontractors
- Onshore civil, welding, and pipefitting crews working the PRGT corridor should track how the subsea tie-in schedule (offshore work starting 2029) affects sequencing of the remaining 650 kilometers of onshore pipeline construction.
- Marine and coastal contractors in northwest British Columbia, including those supporting shore pull-in work, trenching, and seafloor stabilization, should watch for Allseas subcontracting packages as the 2029 mobilization date approaches.
- Companies with experience in concrete-weight-coating and large-diameter pipe (36-48 inch) handling may find opportunities as Allseas builds out its supply chain for the 50-kilometer subsea segment.
- Remote-site logistics providers, including marine transport and camp support operators, should note the project’s isolated location near the Alaska border and plan for the staging and access challenges that come with work in depths approaching 450 meters.
- This award signals that Ksi Lisims LNG’s broader subcontract packages, onshore pipeline segments, terminal construction, and support infrastructure, are advancing toward execution, giving Canadian trades a multi-year window to position for downstream bid opportunities.
