Flexible unbonded pipe and a method for producing such pipe
First Claim
1. 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, andwherein said film layer and said polymer layer are of different materials.
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Accused Products
Abstract
The present invention relates to a flexible unbonded pipe comprising an inner liner capable of forming a barrier against outflow of a fluid which is conveyed through the pipe, and one or more armouring layers on the outer side of the inner line. The flexible unbonded pipe comprises at least one polymer layer and one film layer, said polymer layer being bonded to said film layer. The film layer may preferably be a metal film layer, such as aluminum film, stainless steel film or duplex film. The polymer layer may preferably be cross-linked polyethylene. The interfacial bonding between the polymer layer and the film layer should preferably be sufficiently strong to prevent creation of gas pockets between the layers when subjected to an increased pressure of aggressive fluids (hydrogen, sulphides, methane and carbon dioxide) on the film side of the pipe. Thereby, it is possible to protect armour layer(s) from aggressive fluids.
19 Citations
36 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
- 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,
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8. A flexible pipe according to claim wherein the film layer comprises metal-containing compositions.
Specification