Patent ID: 7976920

Claim:
A flexible unbonded pipe, said pipe comprising at least one polymer layer having a thickness of 4 mm or more, least one film layer having a thickness of greater than 0 mm and 1 mm or less, and one or more armouring layers, said polymer layer being at least 10 times as thick as the film, said film layer providing a fluid permeation barrier against one or more of the fluids methane, hydrogen sulphides, carbon dioxides and water, which is higher than the fluid permeation barrier provided by the polymer layer determined at 50° C. and a pressure difference of 50 bar, and said polymer layer being bonded to said film layer via one or more bondings selected from the group of chemical bondings and physical bondings, wherein said armouring layers are not bonded to said polymer layer, and said armouring layers are not bonded to each other, and wherein said film layer and said polymer layer are of different materials.