Riser and an offshore system

摘要

The invention relates to a riser for transporting fluid between an upper facility and a subsea facility. The riser has a center axis and a length along the center axis and comprises an unbonded flexible metal armored riser section and an unbonded flexible composite armored riser section arranged in fluid connection to each other. The metal armored riser section comprises at least two cross-wound tensile armor layers each comprising a plurality of helically wound elongate metal armor elements wound with a winding angle of about 60 degree or less relative to the center axis. The composite armored riser section comprises at least one tensile armor layer comprising a plurality of helically wound elongate composite armor elements wound with a winding angle of about 60 degree or less relative to the center axis.;The invention also relates to an offshore system comprising such riser.

主权项

1. A riser for transporting fluid between an upper facility and a subsea facility, the riser has a center axis and a length along the center axis and comprises an unbonded flexible metal armored riser section and an unbonded flexible composite armored riser section arranged in fluid connection to each other, said metal armored riser section comprises at least two cross-wound tensile armor layers each comprising a plurality of helically wound elongate metal armor elements wound with a winding angle of about 60 degree or less relative to the center axis, and said composite armored riser section comprises at least one tensile armor layer comprising a plurality of helically wound elongate composite armor elements wound with a winding angle of about 60 degree or less relative to the center axis, wherein the helically wound elongate composite armor elements comprise strips or bundles of strips made of fiber-reinforced polymer.