Flexible unbonded pipe and a method for producing such pipe
US7976920B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2004 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Apr 12, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1393
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.