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The invention relates to an umbilical for use between an offshore construction (10) and a seabed installation (20), comprising one or more of longitudinal umbilical elements, such as one or more filler element, one or more signal cable, one or more fiber optic, one or more electrical power cable, and/or one or more load carrying element like carbon fiber rod, the umbilical further comprises at least one fluid pipe (1a, 1b) arranged within the umbilical (1), the longitudinal umbilical elements (1a, 1b) and the at least one fluid pipe (1a, 1b) are either laid in a continuous helix, or alternatingly/oscillatory laid within the umbilical. The at least one fluid pipe (1a, 1b) is a mix of at least one seamless pipe (1a) and at least one seam-welded pipe (1b), the at least one seamless pipe (1a) and the at least one seam-welded pipe (1b) are spliced together at one or more predetermined locations in the longitudinal direction of the umbilical (1). The invention further relates to a use and a method for arranging the umbilical between the sea-surface offshore construction (10) and a seabed subsea installation (20).

Titel:	UMBILICAL
Link:	Zum Volltext
Veröffentlichung:	2023
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20230392477 Publication Date: December 7, 2023 Appl. No: 18/034687 Application Filed: November 04, 2021 Assignees: AKER SOLUTIONS AS (Lysaker, NO) Claim: 1. An umbilical for use between an offshore construction and a seabed installation, the umbilical comprising: one or more of longitudinal umbilical elements; at least one fluid pipe arranged within the umbilical; wherein the longitudinal umbilical elements and the at least one fluid pipe are either laid in a continuous helix, or alternatingly/oscillatory laid within the umbilical; wherein the at least one fluid pipe is a mix of at least one seamless pipe and at least one seam-welded pipe; and wherein the at least one seamless pipe and the at least one seam-welded pipe are spliced together at one or more predetermined locations in the longitudinal direction of the umbilical. Claim: 2. The umbilical according to claim 1, wherein the umbilical comprises the seamless pipe arranged in the portion of the umbilical around a bend stiffener suspended from the offshore structure, when the umbilical is in use between the offshore construction and the seabed installation. Claim: 3. The umbilical according to claim 1, wherein the umbilical comprises the seamless pipe arranged in the portion of the umbilical situated in a dynamic section between the offshore structure and the seabed when the umbilical is in use between offshore construction and the seabed installation. Claim: 4. The umbilical according to claim 1, wherein the umbilical comprises a seam-welded pipe arranged in the portion of the umbilical situated in a static section where the umbilical extend along the seabed to the seabed installation when the umbilical is in use between offshore construction and the seabed installation. Claim: 5. The umbilical according to claim 1, wherein the predefined locations are situated away from the area(s) of the umbilical that are exposed to the highest fatigue when in use between the offshore construction and the seabed installation. Claim: 6. An umbilical according to claim 1, wherein at least one of the at least one seamless pipe and the at least one seam-welded pipe is made of steel. Claim: 7. The umbilical according to claim 1, wherein the material of the at least one seamless pipe and/or the at least one seam-welded pipe is super duplex stainless steel. Claim: 8. The umbilical according to claim 1, wherein the at least one seam welded pipe and the at least one seamless pipe are spliced by means of a weld. Claim: 9. The umbilical according to claim 1, wherein the at least one seam welded pipe and the at least one seamless pipe are joined and spliced together by means of a transition piece, the transition piece is adapted to be welded at one end to the seamless pipe and at the other end adapted to be welded to the seam-welded pipe in order to obtain a continuous pipe length of different pipes in the umbilical. Claim: 10. The umbilical according to claim 1, wherein the position of the predetermined location when in use is situated in a dynamic section of the umbilical located between the sea surface and the seabed, not including a bend area of the umbilical, such as a sag bend, a hog bend, a touch down point or a bend stiffener. Claim: 11. The umbilical according to claim 1, wherein the position of the predetermined location when in use is situated in a static section of the umbilical located at the seabed. Claim: 12. The umbilical according to claim 1, wherein the at least one seamless pipe and the at least one seam-welded pipe have different nominal cross-sectional geometry. Claim: 13. (canceled) Claim: 14. A method for arranging an umbilical between a sea surface offshore construction and a seabed subsea installation, the umbilical comprising one or more of longitudinal umbilical elements, such as one or more filler element, one or more signal cable, one or more fiber optic, one or more electrical power cable, and/or one or more load carrying element like carbon fiber rod, the umbilical further comprises at least one fluid pipe arranged within the umbilical, the longitudinal umbilical elements and the at least one fluid pipe are either laid in a continuous helix, or alternatingly/oscillatory laid, the method comprising: arranging at least one seamless pipe in a part of the umbilical situated in a high fatigue area, such as a dynamic area of the umbilical positioned between the sea-surface and the seabed when in use between offshore construction and the seabed installation; and arranging at least one seam welded pipe in a part of the umbilical situated in a low fatigue area, such as a static area on the seabed, when in use between the offshore construction and the seabed installation. Claim: 15. The method for arranging an umbilical according to claim 10, wherein method further comprises the splicing of the at least one seam welded pipe and the at least one seamless pipe through welding. Current International Class: 21; 21; 16; 21; 16

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UMBILICAL