Patent ID: 8960239
Filing Date: 2015-02-24
Classification: E21B,F16L

Abstract:
1. An unbonded flexible pipe having a length and a center axis along said length, the unbonded flexible pipe comprising an internal sealing sheath surrounding said center axis, and at least a first and a second tensile armor layers comprising cross wound elements surrounding the internal sealing sheath, said first tensile armoring layer is closer to the internal sealing sheath than the second tensile armoring layer and comprises a first tensile armoring layer comprising a plurality of first helically wound, elongate armoring elements, and a second tensile armoring layer comprising a plurality of second helically wound, elongate armoring elements, where the first helically wound, elongate armoring elements consist of a first material or a first combination of materials and the second helically wound, elongate armoring elements consist of a second material or a second combination of materials, where the first material or the first combination of materials is different from the second material or the second combination of materials, said unbonded flexible pipe further comprises a galvanic barrier layer between said first and said second tensile armoring layer and, wherein the galvanic barrier layer is the outermost liquid impermeable layer, so that an outer side of the galvanic barrier layer is wetted with sea water when the pipe is submerged.