Piggable Pipeline WYE Connection - Development and Design

  • P. G. Brown
  • J. Ritchie
  • K. McKay
  • A. J. Grass
Part of the Advances in Underwater Technology, Ocean Science and Offshore Engineering book series (AUTOO, volume 24)

Abstract

This paper considers the design and development of a 30-inch piggable subsea pipeline Y-connection which a major operator intends to install in a central North Sea gas pipeline. A Y- connection of this type enables two pipelines of the same diameter to be tied-in whilst maintaining full piggability. This will be the first known fully piggable Y-connection for a subsea gas pipeline and as such offers significant advantages over other tie-in methods, such as tee connections and riser platforms, both of which require some degree of intervention.

General aspects relating to the overall arrangement such as valving, piping layout requirements and protection and installation requirements are discussed although emphasis is placed on the Y-connection itself. The major stages in the design and development of the Y-connection are explained. These include design of the internal geometry to allow unhindered passage of pigs, structural analysis and material selection. A method developed for predicting minimum flow velocities required in the pipeline to achieve successful pigging is also presented.

Keywords

Internal Geometry SUBSEA Pipeline Maximum Equivalent Stress Minimum Fluid Velocity Dimensional Finite Element Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Society for Underwater Technology 1990

Authors and Affiliations

  • P. G. Brown
    • 1
  • J. Ritchie
    • 1
  • K. McKay
    • 1
  • A. J. Grass
    • 2
  1. 1.J P Kenny Caledonia Ltd.UK
  2. 2.University College LondonUK

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