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Vertical Riser

asked May 30, 2015 in Subsea by philyanko (1,060 points)

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answered May 30, 2015 by philyanko (1,060 points)

The vertical riser is used to provide the vertical flow path for the fluid from the seabed.  It should be multi-layered flexible pipe of unbounded construction, suitable for dynamic applications.

Riser Structure

The riser should consist of at least the following four layers:

  • An inner layer of interlocked steel carcass to provide structural strength against pipe collapse.
  • A fluid-containing liner for making the pipe leakproof.
  • An armor layer to sustain axial loads.
  • An external plastic sheath to hold the underlying armors in place and provide resistance to corrosion and abrasion.

Pipe Construction and End Fittings

  • Details of the non-bonded pipe construction and end fittings can be found in API RP 17B, Section 3.
  • The flexible pipe should be fitted at either end with the following:
    • End fittings
    • Flanges
    • Bending stiffeners
  • The bottom end should terminate at the riser base through a collet connector and a ball valve.
  • The upper end should be mated to the subsea swivel attached to the subsurface buoy.

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