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A large diameter subsea gravity separator for ultra deep water conditions of 2000 to more than 4000 m includes a vessel having a shell which defines a cylindrical tubular portion and closure portions at axially both ends of the tubular portion. The shell is a sandwich shell which is dimensioned to p

A large diameter subsea gravity separator for ultra deep water conditions of 2000 to more than 4000 m includes a vessel having a shell which defines a cylindrical tubular portion and closure portions at axially both ends of the tubular portion. The shell is a sandwich shell which is dimensioned to provide for a predetermined collapse resistance of at least MPa and includes an inner steel layer, an outer steel layer and a concrete layer completely filling the space between the inner steel layer and the outer steel layer.

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1. Subsea gravity separator comprising a vessel having a shell which defines a cylindrical tubular portion and closure portions at both ends of the tubular portion, the vessel further having a fluid inlet port and at least two fluid outlet ports, wherein the tubular portion has an inner diameter of

1. Subsea gravity separator comprising a vessel having a shell which defines a cylindrical tubular portion and closure portions at both ends of the tubular portion, the vessel further having a fluid inlet port and at least two fluid outlet ports, wherein the tubular portion has an inner diameter of at least 2 m and an axial length of at least 10 m,wherein the shell is a sandwich shell which is dimensioned to provide for a predetermined collapse resistance of at least 30 MPa and comprises an inner steel layer, an outer steel layer and a concrete layer supported between the inner steel layer and the outers steel layer providing composite action between the inner and the outer steel layer. 2. Separator according to claim 1, wherein the inner diameter of the shell is less than 5 m and the predetermined collapse resistance of the shell is between 30 and 60 MPa. 3. Separator according to claim 2, wherein each of the inner steel layer and the outer steel layer has a thickness of not more than 50 mm and consists of steel having a yield strength of at least 500 MPa. 4. Separator according to claim 2, wherein the concrete layer consists of concrete having at least one parameter of a compressive strength of more than the predetermined collapse resistance of the vessel and a Young's modulus of more than 12 GPa. 5. Separator according to claim 1, wherein each of the inner steel layer and the outer steel layer has a thickness of not more than 50 mm and consists of steel having a yield strength of at least 500 MPa. 6. Separator according to claim 5, wherein each of the inner steel layer and the outer steel layer has a thickness of at least 25 mm. 7. Separator according to claim 6, wherein the inner steel layer and the outer steel layer are of equal thickness. 8. Separator according to claim 5, wherein the inner steel layer and the outer steel layer are of equal thickness. 9. Separator according to claim 5, wherein the concrete layer consists of concrete having at least one parameter of a compressive strength of more than the predetermined collapse resistance of the vessel and a Young's modulus of more than 12 GPa. 10. Separator according to claim 1, wherein the concrete layer consists of concrete having at least one parameter of a compressive strength of more than the predetermined collapse resistance of the vessel and a Young's modulus of more than 12 GPa. 11. Separator according to claim 1, wherein the thickness of the concrete layer is larger than a total thickness of the inner steel layer and the outer steel layer and is less than twice the total thickness. 12. Separator according to claim 1, wherein the concrete layer consists of concrete having a density in a range of 1400 to 2600 kg/m3. 13. Separator according to claim 1, wherein the inner steel layer at the tubular portion of the shell has an inner diameter out-of-roundness of less than about 2.0%. 14. Separator according to claim 13, wherein the inner steel layer at the tubular portion of the shell has an inner diameter out-of-roundness of less than about 1.0%. 15. Separator according claim 1, further comprising a plurality of spacer elements extending through the concrete layer between the inner steel layer and the outer steel layer. 16. Separator according to claim 1, wherein each of the ports comprises a tube portion, which extends through the shell and is sealingly welded to the inner steel layer and the outer steel layer. 17. Separator according to claim 1, wherein the outer steel layer is free of stiffening rings enclosing the outer circumference of the tubular portion of the shell. 18. Method for producing a subsea gravity separator according to claim 1, comprising the steps of: a) providing an inner steel layer and an outer steel layer of a shell of a vessel having a cylindrical tubular portion and closure portions at axially both ends of the tubular portion such that the inner steel layer and the outer steel layer are arranged coaxially with an axis of the tubular portion extending vertically and further providing a plurality of ports extending through both the inner steel layer and the outer steel layer,b) continuously injecting concrete of initial fluid consistency through an injection port penetrating the outer steel layer at the bottom of the shell to completely fill any free volume between the inner steel layer and the outer steel layer, andc) closing the injection port and a venting port penetrating the outer steel layer at the top of the shell. 19. Method according to claim 18, wherein step a) further comprises providing a plurality of pairs of cylindrical tubular steel rings with a first steel ring of each pair having a diameter corresponding to the diameter of the inner steel layer at the tubular portion of the shell and a second steel ring of each pair having a diameter corresponding to the diameter of the outer steel layer at the tubular portion and coaxially arranging the pairs of steel rings one above the other while welding a lower edge of each steel ring to an upper edge of a portion of the inner steel layer and the outer steel layer, respectively, which was formerly provided. 20. Method according to claim 19, wherein step a) further comprises welding a plurality of radially extending spacer elements between the first and second steel ring of each pair of steel rings.