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Topsoil is removed and the ground (or grade) prepared along the right-of-way. Topsoil is stored so it can be replaced following construction.
Construction crews dig the trench for the pipe, storing the soil to fill the trench after the pipe is laid.
Pipeline crews line up sections of the pipe along the edge of the trench. A machine bends the pipe so that it follows the pipeline route and the contour of the land.
Welders join the pipe segments together. Pipeline joints are coated with an anti-corrosion material and then inspected. Extreme care is used to properly weld the pieces together. Each seam is examined through a nondestructive inspection process.
Following a careful inspection, specially designed cranes are used to lower the sections of welded pipe into the trench. A separate crew completes the final welds (tie-ins) connecting continuous lengths of pipeline that have been lowered into the trench.
The stored subsoil is returned to the trench to bury the pipeline.
The pipeline is filled with water and pressurized up to a level that exceeds the operating pressure of the line to ensure that the pipeline is ready to transition safely to operation.
Once testing is complete, final techniques are employed to stabilize the right-of-way, return the ground surface to its original contours for drainage patterns, replace topsoil, and allow for the re-establishment of appropriate vegetation. The goal is to bring the land as close to the original state as possible.
TransCanada is proposing to construct, own and operate the Eastern Mainline Project, which will include approximately 279 kilometres of new natural gas pipeline facilities that will be integrated into the Canadian Mainline system upon completion. The project will also include the addition of nine compression units at five existing sites. The addition of this new natural gas transmission infrastructure will provide businesses, homes, schools and hospitals in Ontario and Quebec with access to a safe and diverse source of natural gas.