Method of installing an unbonded flexible pipe
AssigneeNational Oilwell Varco Denmark I/S
InventorsJonas Gudme, Adam Rubin, Marie Haahr
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Abstract
The present invention relates to a method of installing an unbonded flexible pipe with a bore for transportation of fluid wherein the unbonded flexible pipe comprises an outer sheath, an inner sealing sheath inside the outer polymer sheath, an annulus between said outer sheath and said inner sealing sheath and at least one metallic armor layer comprising iron located in said annulus, wherein the method comprises filling at least a part of the annulus with a corrosion promoting liquid before or after installing the unbonded flexible pipe between a first installation and a second installation.
Claims20
A method of installing an unbonded flexible pipe with a bore for transportation of fluid wherein the unbonded flexible pipe comprises an outer sheath, an inner sealing sheath inside the outer polymer sheath, an annulus between said outer sheath and said inner sealing sheath and at least one metallic armor layer comprising iron located in said annulus, wherein the method comprises
- filling at least a part of the annulus with a corrosion promoting liquid to control a distributed corrosion of the at least one metallic armor layer, the filling being before or after installing the unbonded flexible pipe between a first installation and a second installation.
A subsea system comprising an unbonded flexible pipe and a first and a second installation wherein at least one of the first and the second installations is a subsea installation, said unbonded flexible pipe comprises
- a bore, said unbonded flexible pipe being arranged to transport fluid between said first and said second installation via the bore;
- an outer sheath;
- an inner sealing sheath inside the outer polymer sheath;
- an annulus between said outer sheath and said inner sealing sheath;
- and
- a metallic armor comprising iron located in said annulus,
- wherein the annulus is at least partly filled with a corrosion promoting liquid to control a distributed corrosion of the metallic armor.
Dependencies are inferred from the claim text.