Pipe is buried underground, on a layer of gravel cleared of sharp rocks.
Refrigerated Buried Pipe
Insulated pipe is buried underground. Chilled brine circulates through loops of six-inch diameter pipe to keep the ground frozen.
Pipe is elevated on vertical supports that allow for the ground's movement. The zigzag path allows the pipe to expand or contract as the temperature changes. This configuration also protects against earthquakes.
Bridges carry the Trans-Alaska pipeline over 13 river crossings. Bridge designs include: a welded trough that supports the pipe, suspension bridges, a box beam that encases the pipe, and a variant known as a tied arch bridge.