Line 5 operations and maintenance



Preserving and maintaining an exceptionally well-built pipeline.

Our industry-leading operations and maintenance programs use both human resources and cutting-edge technology. They provide multiple layers of protection, as well as comprehensive leak-detection capabilities – and they’ve helped maintain the safety and reliability of Line 5 for more than six decades.

Line 5 operates at less than 25 per cent of its maximum pressure capacity, which minimizes stress on the heavy-walled, carbon-steel pipe that forms Line 5 – and also enhances safety.

Every batch of oil that enters our system must meet stringent quality standards, and is treated to kill any corrosion-inducing microorganisms.

Multi-layered protections have maintained Line 5 safety for more than six decades

Since 2002, we’ve used a screw anchor support system to secure the twin pipelines running along the bottom of the Straits. These 10-foot-long steel screws are augered into the lake bed on either side of the parallel lines, and hold a steel saddle that permanently supports the lines. The Line 5 Straits crossing now has 128 support anchors, including four that were installed in October and November 2016.

After six decades of operation, recent inspection reports show that Line 5, from an engineering and maintenance perspective, is like new and in excellent condition.


Line 5 Operational Reliability Report

The safety and operational reliability of our pipelines is the very foundation for our business and is recognized as critical to assuring the Company’s ongoing success.

What a well-built, well-maintained, 63-year-old pipeline looks like
Original segment of Line 5 a testament to extraordinary engineering, decades of vigilant maintenance