Conductor blocking by means of intermittent filling with two component hardening composition
AssigneeNexans
InventorsKarl Magnus Bengtsson, Elise Olsen, Jan Øivind Hewitt, Robin Sangar
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Abstract
The present invention relates to the technical field of subsea power cables. More specifically, the invention relates to a subsea power cable comprising at least one cable core comprising a bundle of metal wires and more than one layer of a cured two-component hardening composition, wherein the more than one layer of the cured two-component hardening composition is intermittently provided along the longitudinal direction of the power cable. The present invention further relates to a method of manufacturing the power cable according to the invention.
Claims15
A power cable (1) for subsea applications, which power cable comprises
- at least one cable core (2) comprising a bundle of metal wires (3) and
- more than one layer (6a,b) of a cured two-component hardening composition (6), characterized in that
- the metal wires (3) of the bundle of metal wires (3) are arranged in more than two radially assembled layers (4a,b,c);
- and wherein one layer of the more than one layer of the cured two-component hardening composition (6a,b,c,d) is arranged between two of the more than one radially assembled layer (4a,b,c) of metal wires (3).
The power cable (1) according to any one of the preceding claims, wherein the cured two-component hardening composition (6) is a thermoset polyurethane having a Shore A hardness in the range of 50 to 70, preferably 52 to 68, more preferred 55 to 65, most preferred 58 to 62.
The power cable (1) according to any one of the preceding claims, wherein the two-component hardening composition (6) comprises a first component comprising a polymeric isocyanate and a second component comprising a polyol.
The power cable (1) according to any one of the preceding claims, wherein each layer of the more than one layer (6a,b) of the cured two-component hardening composition have at least one contact point to its adjacent layer of the more than one layer of the cured two-component hardening composition;
- or
- wherein each layer of the more than one layer of the cured two-component hardening composition (6a,b) is at least partly intermixing with its adjacent layer of the more than one layer of the cured two-component hardening composition (6a,b).
The power cable (1) according to any one of the preceding claims, wherein at least one layer of the cured two-component hardening composition (6a,b,c,d) is arranged between two of the more than one radially assembled layer (4a,b,c) of metal wires (3) by being squeezed in voids between the two adjacent layers of metal wires (3).
The power cable (1) according to any one of the preceding claims, wherein the bundle of metal wires (3) has a diameter of 10 mm to 90 mm, preferably more than 10 mm to less than 90 mm, more preferred from 25 mm to 70 mm, even more preferred 40 to 60 mm, most preferred 42 to 58 mm.
A method of manufacturing a power cable (1) comprising the steps of:
- providing metal wires (3) and providing a filling die for applying a two-component hardening composition;
- stranding a first layer (4a) of metal wires (3);
- applying a first layer of the two-component hardening composition (6b) by the filling die;
- stranding a second layer (4b) of metal wires (3) on the first layer (4a) of the two-component hardening composition (6b);
- and
- hardening the two-component hardening composition to obtain a cured two-component hardening composition (6) attached to the layers of metal wires (3).
Dependencies are inferred from the claim text.