The Process
Oregon Pipeline works closely with property owners to minimize the impact of its pipeline route and to answer questions. When possible, the pipeline will follow existing easements.
Constructing natural gas pipelines requires a great deal of planning and preparation. In addition to actually building the pipeline, several permitting and regulatory processes must be completed. In many cases, prior to beginning the permitting and land access processes, pipeline companies prepare a feasibility analysis to ensure that an acceptable route for the pipeline exists that provides the least impact to the environment and public infrastructure already in place.
Installing a pipeline takes place in many stages:
- The mapped path of the pipeline is carefully cleared of any impediments. Then, sections of pipe 40 to 80 feet long are laid out along the path. The pipe used by Oregon Pipeline will be constructed of plastic-coated, welded steel with a wall thickness of 0.5 to 0.75 inches.
- Trenches, typically five to six feet deep, are dug alongside the laid out pipe. Current regulations require the pipe to be placed at least 30 inches below the surface. At certain places, however, including road crossings and bodies of water, the pipe is buried even deeper.
- The pipe is then assembled and contoured. This includes welding the sections of pipe together into one continuous pipeline, and bending it slightly, if needed, to fit the contour of the pipeline’s path. A coating is applied to the ends of the pipes, and the entire coating of the pipe is inspected to ensure that it is free from defects.
- The pipes are then lowered into the trenches. Once the pipe is in the ground, the trench is filled carefully to ensure that the pipe and its coating are not damaged.
- The pipeline is tested to ensure it is strong and solid enough to handle the pressured natural gas that will eventually be pumped through it. Called a hydrostatic test, Oregon Pipeline will run water through the pipeline at pressures well above what will be needed for natural gas transportation. The entire length of the pipe will be tested before approval is received and any natural gas is sent to customers.
- Once the pipeline is installed, Oregon Pipeline will implement its plan to restore the pipeline’s pathway. This often includes replacing topsoil, fences, irrigation canals, and anything else that may have been removed or upset during the construction process.
For additional information on natural gas pipelines and the transmission of natural gas, visit www.naturalgas.org.
(Source: www.naturalgas.org and Oregon Pipeline)