Trans Mountain has proactive programs to identify all hazards that could affect pipeline safety and then to monitor and assess for the presence of these hazards with a goal of preventing pipeline failures. A summary of the measures used to prevent and monitor common pipeline hazards is provided below.

All pipelines have a corrosion resistant external coating and are further protected with impressed current cathodic protection systems in the event of a coating defect. The cathodic protection system is remotely monitored and the data collected is analyzed to ensure the pipeline is effectively protected.

Internal inspection tools, or smart pigs, form the foundation of anomaly detection investigation and pipeline repair programs. Some of tools use technologies similar to the ones used in medical imaging devices and they are used to detect a variety of pipeline defects. Magnetic Flux Leakage (MFL) tools (shown in illustration above) detect metal loss from corrosion. Caliper or ultrasonic tools detect corrosion related metal loss as well as mechanical damage such as dents and gouges. Shear wave ultrasonic and Electro-Magnetic Acoustic Transmission (EMAT) tools are used for crack detection. 

Video courtesy of Rosen Inspection.

If a defect is detected, the affected location is dug up, assessed, repaired, or in rare instances replaced, then re-coated and backfilled.


The Pipeline Protection Program is focused on preventing mechanical damage to the pipeline as a result of third-party activity. The pipeline is buried for mechanical protection, but can potentially be damaged by unauthorized excavation or activities. For this reason, Trans Mountain supports the One-Call system and uses it as a key element of its damage prevention program. Other elements of the damage prevention program include enforcing safe ground disturbance practices for those working near the pipeline, marking the pipeline right-of-way and routinely patrolling it from the air and on the ground to monitor for unauthorized activities or other threats.


Additionally, Trans Mountain employs a Geohazard Management Program to monitor and protect against damage to the pipeline from unstable slopes, stream crossings and seismic events. This program employs a custom database that has been in place since 2003. It is used to document inspections and preventive maintenance work at more than 600 sites along the right-of-way and to schedule future inspection frequency based on risk.

Ongoing ground maintenance includes clearing vegetation along the right-of-way to ensure inspection visibility from the air. Aerial inspections monitor areas where streams cross the pipeline for potential water erosion and exposure of the pipeline. Trans Mountain employees and contractors can then be dispatched to investigate and correct any concerns, if required. Efforts may include armouring a streambed against erosion with natural materials including large boulders and rock substrate, commonly referred to as rip-rap.