Irving Oil Sets Major Two Month Turnaround for Canada’s Largest Refinery

Irving Oil Ltd. is preparing a substantial autumn maintenance campaign at its 320,000 barrel per day Saint John refinery in New Brunswick, the largest refining complex in Canada.

The planned turnaround will remove the facility from service for about two months while crews perform scheduled mechanical work.

The refinery is expected to begin coming offline on Sept. 8. Irving Oil has scheduled the core mechanical portion of the maintenance event from Sept. 11 through Nov. 8, according to information published by the company.

Operations are expected to begin resuming on Nov. 18.

That schedule gives Irving Oil time after completion of the main maintenance program to conduct inspections, testing, commissioning, and the controlled restart of affected processing equipment.

Large refinery restarts require careful sequencing across interconnected units, utilities, storage systems, and product handling infrastructure.

The process can take several days as operators stabilize equipment, confirm operating conditions, and restore production rates without compromising safety or reliability.

Irving Oil has not disclosed which processing units or pieces of equipment will receive work during the approaching turnaround.

The absence of detailed project information leaves the precise scope, contractor requirements, and expected effects on individual fuel production streams unclear.

Routine turnarounds remain essential for major refineries because continuous operation places significant demands on pressure vessels, piping, furnaces, reactors, compressors, and rotating equipment.

Planned outages allow operators to inspect internal components, replace worn materials, complete repairs, and address reliability concerns that cannot be managed while units remain active.

The Saint John complex is a critical component of the eastern Canadian fuel supply system.

With capacity of 320,000 barrels per day, any extended outage at the refinery can attract close attention from regional product markets, distributors, terminal operators, and customers monitoring gasoline, diesel, heating fuel, and other refined product availability.

Irving Oil completed another major maintenance campaign at the refinery in 2025.

That program, called Operation Eastern Screech Owl, represented an investment of nearly $40 million and kept crews focused on the site during a planned 30 day turnaround.

Work associated with the 2025 event was expected to include infrastructure replacements, equipment improvements, and extensive inspections of refinery piping and important operating units.

Such projects are designed to strengthen mechanical integrity while reducing the risk of failures that could lead to unplanned shutdowns.

The 2025 turnaround also took place alongside a separate $100 million investment in the refinery’s fluid catalytic cracking unit.

Irving Oil began that upgrade program in June 2025, adding another significant layer of construction and technical activity at the Saint John site.

Fluid catalytic cracking is one of the refinery’s most commercially important conversion processes.

The unit transforms heavier hydrocarbon streams into higher value products, including gasoline components, making its performance central to refinery margins, product flexibility, and efficient crude processing.

Irving Oil said the fluid catalytic cracking unit modernization would proceed through multiple phases during the second half of 2025.

The planned work involved substantial upgrades intended to maximize operating performance while improving the efficiency and reliability of the unit.

The privately held company has not provided a detailed public update on the current status of that modernization effort.

It also has not indicated whether any remaining work related to the project will be incorporated into the forthcoming two month turnaround.

The scheduled autumn shutdown reflects the scale of maintenance required at a refinery of Saint John’s size and complexity.

Coordinating mechanical work across a major processing site requires extensive planning, specialized labor, material procurement, regulatory compliance, and strict control of safety procedures.

For Irving Oil, the central objective will be to complete the program within the announced window and return the refinery to stable service beginning Nov. 18. Market participants will be watching both the shutdown and restart closely, particularly because the company has not yet revealed the units included in the maintenance scope.

Further disclosures could clarify whether the event is limited to routine inspections and repairs or includes larger equipment replacements and modernization work.

Until then, the operating calendar provides the clearest signal of the refinery’s expected absence from the regional fuel market during the fall.