Subsea penetrator and method for producing such
The present invention relates to a subsea fibre-optic penetrator comprising a plurality of through-going optical fibres ( 1 ) and a metallic main body ( 3 ) with at least one through bore ( 31 ). According to the invention the optical fibres ( 1 ) are affixed in the main body ( 3 ) by cast glass material ( 2 ). The invention also relates to a method for providing a subsea penetrator with a plurality of through-going fibres.
1. A subsea fibre-optic penetrator configured for arrangement in a penetrator feed-through formed in a wall of a penetrator housing, the subsea fibre-optic penetrator comprising:
a plurality of through-going optical fibres in a metallic main body member with at least one through bore,
wherein a plurality of optical fibres are directly affixed in the main body member by an integral body of cast glass material in one of the through bores, such that the plurality of optical fibres are encased by the integral body of cast glass material,
wherein the main body member comprises a portion of an outer profile adapted for metal-metal sealing against an inner surface of a first axial portion of the penetrator feed-through, and
an attachment portion that rotates relative to the main body member of the penetrator, wherein the attachment portion is configured for insertion into a second axial portion of the penetrator feed-through, and wherein a radially exterior surface of the attachment portion is configured to interact with a radially interior surface of the second axial portion of the penetrator feed-through to secure the main body member in the first axial portion of the penetrator feed-through and the attachment portion in the second axial portion of the penetrator feed-through.
2. A subsea penetrator according to claim 1 , wherein the main body member comprises an outer profile adapted for providing a seal against a penetrator feed-through.
3. A subsea penetrator according to claim 1 , wherein the cast glass material and the metallic material of the main body member have compatible coefficient of expansion.
4. A subsea penetrator according to claim 1 , wherein at least a portion of the bore is casted with the glass material.
5. A subsea penetrator according to claim 1 , wherein an inner surface of the through bore defines an internal flange configured to resist movement of the integral body of cast glass material in an axial direction.
6. A subsea penetrator according to claim 1 , wherein the radially exterior surface of the attachment portion forms a threaded connection with the radially interior surface of the second axial portion of the penetrator feed-through.
7. A method for manufacturing a subsea fibre-optic penetrator, comprising:
providing a metallic main body member with at least one through bore, the main body member including a portion of an outer profile adapted for metal-metal sealing against an inner surface of a first axial portion of a penetrator feed-through, and
directly affixing a plurality of optical fibres in the main body by an integral body of glass material in a through bore, wherein the directly affixing includes encasing the plurality of optical fibres by the integral body of cast glass material,
providing an attachment portion that rotates relative to the main body member of the penetrator, wherein the attachment portion is configured for insertion into a second axial portion of the penetrator feed-through, and wherein a radially exterior surface of the attachment portion is configured to interact with a radially interior surface of the second axial portion of the penetrator feed-through to secure the main body member in the first axial portion of the penetrator feed-through and the attachment portion in the second axial portion of the penetrator feed-through.