Marine pipelines are essential for transporting oil and gas. Therefore, you need an expert heavy civil marine contractor to install marine pipelines. Placing a pipeline under the water raises some interesting concerns. For example, keeping your pipeline on the sea floor can be a challenge. Your heavy civil marine contractor uses advanced methods to place and install oil and gas marine pipelines.
Risks of Installing Marine Pipelines
Installing marine pipelines can be quite difficult. The risk of pipeline collapse is highest during the installation process. While your heavy civil marine contractor installs your pipeline below the water’s surface, external over-pressure is at its greatest. This increases the likelihood of pipeline collapse.
Methods your Heavy Civil Marine Contractor Uses to Install Pipelines
To bypass these issues, your marine construction contractor uses expert pipeline installation techniques. There are three general ways to install marine pipelines, each with many variations. Your marine pipeline installation contractor will customize the process to your project’s needs.
Tow-in lay is one method your heavy civil marine contractor may use to install your pipeline. This method involves suspending your pipeline and using tug boats to tow it into place. Then, your marine pipeline specialists either fill the pipe with water or remove the buoyancy modules. This sinks it into place on the sea floor.
By contrast, the “s-lay” technique involves easing your pipeline off a marine vessel. Then your specialists weld more pipeline on as they go. This creates an s-shaped curve, which is where the method gets its name. Your heavy marine construction company must maintain proper tension by moving the vessel forward at the correct speed. Otherwise, your pipe may collapse during the s-lay method.
The j-lay method also requires pushing your pipeline into the water from a ship. Unlike the s-lay method, your marine construction specialists use a tower to hoist the pipeline almost vertically. This helps reduce physical stress on the pipe. J-lay works best for deep-water marine pipeline installation.