Subsea pipeline design analysis and installation

  • How is a pipeline built under the sea?

    With an S-Lay Installation, large ships lower the welded pipes onto the seabed over a boom called a 'stinger' that juts out water like a slide, in an s-shape.
    With a J-Lay installation, the pipes are eased off the ship deck at more of a vertical angle, forming a j-shape..

  • What are the methods of pipeline installation?

    Usually two rigs tow the pipeline to location; one leading and one trailing.
    On location the pipeline is positioned and flooded.
    This method of installation is usually used when several flowlines are fabricated together (i.e. a bundle)..

  • What is the concept of pipeline design?

    Pipeline design includes a selection of the route traversed by the pipe, determination of the throughput (i.e., the amount of fluid or solids transported) and the operational velocity, calculation of pressure gradient, selection of pumps and other equipment, determination of pipe thickness and material (e.g., whether .

  • Offshore pipelines, with an outer diameter ranging from 0.1 to 1.5 m, are commonly installed by laying from a vessel, using an S-lay, J-lay, or reel lay configuration.
    A less common installation of pipeline is the towing method where the pipeline is assembled on shore.
  • Pipeline design includes a selection of the route traversed by the pipe, determination of the throughput (i.e., the amount of fluid or solids transported) and the operational velocity, calculation of pressure gradient, selection of pumps and other equipment, determination of pipe thickness and material (e.g., whether
  • With an S-Lay Installation, large ships lower the welded pipes onto the seabed over a boom called a 'stinger' that juts out water like a slide, in an s-shape.
    With a J-Lay installation, the pipes are eased off the ship deck at more of a vertical angle, forming a j-shape.

How do you repair a subsea pipeline?

As water depths and pipe sizes increase, equipment and methods for connecting and repairing subsea pipelines must be more flexible and more easily maintained

In relatively shallow water, connection or repair can often be made by lifting the pipe to the surface

How hp/ht service conditions affect a subsea pipeline?

Subsea pipelines under HP/HT service conditions have to face various challenges from both the internal and external environments since the date of their commissioning, which may greatly affect their real service life

What is a subsea pipeline called?

The subsea pipeline from the processing facilities to the shore is called the export pipeline

Flowlines are subsea pipes transporting unprocessed fluids from the wellhead to the riser base (Bai and Bai, 2014)

Thus, it is difficult, if not impossible, to accurately identify the mode frequencies and shapes of subsea pipelines


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