Line 10: Making a safe pipeline safer

The Line 10 Westover Segment Replacement Project will proactively address pipeline maintenance requirements, enhance reliability and safety of the system and restore the pipeline to its original operating capacity.

The project focuses on replacing 35 km of existing 12-inch-diameter steel pipe, installed in 1962, with new 20-inch line. By replacing this segment of Line 10 rather than applying several preventative maintenance digs, we will minimize overall disturbance to landowners along the right-of-way and the environment, address ongoing maintenance requirements and make a safe pipeline even safer.

The replacement pipe will run parallel to the existing line, within the same right-of-way, for the majority of its length. Through consultation with landowners and local authorities, we are exploring re-routing the line in three areas (about 11.5 km in total, along new rights-of-way).

In addition to enhancing safety and proactively addressing future maintenance needs, replacing this segment with 20-inch pipe will restore the capacity of Line 10 to more closely approximate what it has carried in the past, up to 74,200 barrels per day (bpd) of oil. (Actual daily capacity varies, depending on a number of operating factors, including product mix, seasonal weather and pump conditions).

Since November 2013, Line 10 has operated under a pressure restriction that limits its daily capacity to a maximum of 63,500 bpd. Pressure restrictions ensure the continued safe operation of a pipeline and can be imposed by a regulator or voluntarily undertaken by an operating company. In this case, Enbridge put the restriction in place voluntarily, following detailed engineering and technical analysis.

Our regulatory application includes a detailed plan to decommission the segment of Line 10 that’s to be replaced, leaving the pipe in the ground. A decommissioned line is one that is taken out of service safely and permanently, but left in place while other pipelines in the same right-of-way continue to operate.

The application can be viewed on the NEB website at: (Volume 1) (Volume 2)

Leaving this segment of pipe in place is the safest and least disruptive option at our disposal – it means no additional disturbance from excavation and removal activities and less risk of future soil and slope instability, settlement and compaction issues that could compromise the safety of active pipelines sharing the right-of-way. Independent engineering research demonstrates that decommissioned pipelines have a very long life as load-bearing structures for supporting soil and surface loads.

Once disconnected from our active Line 10 pipeline system, the replaced segment will continue to be monitored by Enbridge along with the other pipelines in the right-of-way. Landowners are not responsible for any decommissioned Enbridge line – we are. Forever.