Patent Number: 
Section: claims

1. A cross-over fluid coupling comprising:a first coupling end;a second coupling end spaced apart from the first coupling end in an axial direction;a plurality of first conduits extending between the first and second coupling ends and configured to allow fluid to flow through the cross-over fluid coupling, each first conduit having an inner end disposed toward the first coupling end and an outer end spaced apart from the inner end toward the second coupling end in the axial direction and being outboard of the inner end in a lateral direction that is orthogonal the axial direction; anda plurality of second conduits extending between the first coupling end and the second coupling end and configured to allow fluid to flow through the cross-over fluid coupling, each second conduit having an outer end that is disposed toward the first coupling end and positioned laterally outboard of the inner end of at least one of the first conduits, and an inner end that is spaced apart from the outer end thereof toward the second coupling end in the axial direction and is laterally inboard of the outer end of the at least one of the first conduits. 2. The cross-over fluid coupling of claim 1, wherein the outer end of a first one of the first conduits at least partially surrounds the inner end of a first one of the second conduits. 3. The cross-over fluid coupling of claim 2, wherein the outer end of the first one of the first conduits partially surrounds the inner end of the first one of the second conduits and the inner end of a second one of the second conduits. 4. The cross-over fluid coupling of claim 2, wherein the coupling comprises a central coupling axis and a first plane containing the central coupling axis intersects the first one of the first conduits and does not intersect the first one of the second conduits. 5. The cross-over fluid coupling of claim 4, wherein the first plane is a plane of symmetry for the first one of the first conduits. 6. The cross-over fluid coupling of claim 4, further comprising a second plane containing the central coupling axis, and wherein the second plane intersects the first one of the second conduits and does not intersect the first one of the first conduits. 7. The cross-over fluid coupling of claim 6, wherein the second plane is a plane of symmetry for the first one of the second conduits. 8. The cross-over fluid coupling of claim 6, wherein the second plane intersects the first plane at an intersection angle that is between about 20 degrees and about 90 degrees. 9. The cross-over fluid coupling of claim 8, wherein there are n first conduits and n second conduits, wherein the first conduits are substantially identical and the second conduits are substantially identical, and wherein each of the first and second conduits, for a least a major part of the length thereof, in a cross-section in a plane orthogonal to the axial direction, extends through 360/n degrees. 10. The cross-over fluid coupling of claim 9, wherein the intersection angle is 180/n degrees. 11. The cross-over fluid coupling of claim 1, wherein:the inner ends of the plurality of first conduits are nested laterally between the outer ends of the plurality of second conduits;the inner ends of the plurality of second conduits are nested laterally between the outer ends of the plurality of first conduits; andthe outer end of each second conduit at least partially surrounds the inner ends of at least two of the first conduits, and the outer end of each first conduit at least partially surrounds the inner ends of at least two of the first conduits. 12. The cross-over fluid coupling of claim 1, wherein:the outer ends of the first and second conduits are each generally arcuate in shape, the outer ends of the first conduits co-operate with each other to define a first generally annular outer ring area, and the outer ends of the second conduits co-operate with each other to define a second generally annular outer ring area; andthe inner ends of the first and second conduits are generally arcuate in shape, the inner ends of the first conduits co-operate with each other to define a first generally circular area, and the inner ends of the second conduits co-operate with each other to define a second generally circular area. 13. The cross-over fluid coupling of claim 1, wherein the plurality of first conduits are substantially identical to each other and to the plurality of second conduits, and wherein the plurality of second conduits are oriented 180 degrees relative to the plurality of first conduits about the axial direction of the coupling. 14. The cross-over fluid coupling of claim 1, further comprising a first flange disposed at the first coupling end and retaining the inner ends of the first conduits and the outer ends of the second conduits, and a second flange disposed at the second coupling end and retaining the outer ends of the first conduits and the inner ends of the second conduits. 15. The cross-over fluid coupling of claim 1, wherein the plurality of first conduits are spaced apart from each other and from the plurality of second conduits whereby gaps are provided between adjacent ones of the first and second conduits. 16. The cross-over fluid coupling of claim 1, further comprising a generally cylindrical outer sheath laterally surrounding the plurality of first conduits and the plurality of second conduits. 17. The cross-over fluid coupling of claim 1, wherein the inner end of a first one of the first conduits has a first cross-sectional area, the outer end of a first one of the second conduits has a second cross-sectional area, and the first cross-sectional area is between about 50% and 110% of the second cross-sectional area. 18. A cross-over fluid coupling for connecting a first set of pipes, having a first inner pipe and a first outer pipe at least partially surrounding the first inner pipe, to a second set of pipes, having a second inner pipe and a second outer pipe at least partially surrounding the second inner pipe, the coupling comprising:a first coupling end connectable to the first set of pipes;a second coupling end connectable to the second set of pipes and spaced apart from the first coupling end in an axial direction;a plurality of first conduits extending between the first and second coupling ends and configured to allow fluid to flow between the first set of pipes and the second set of pipes, each first conduit having a first end fluidly connectable to the first outer pipe and a second end that is spaced apart from the first end toward the second coupling end in the axial direction and is fluidly connectable to the second inner pipe to fluidly connect the first outer pipe to the second inner pipe; anda plurality of second conduits extending between the first coupling end and the second coupling end and configured to allow fluid to flow between the first set of pipes and the second set of pipes, each second conduit having a first end that is connectable to the first inner pipe and a second end that is spaced apart from the first end toward the second coupling end in the axial direction and is connectable to the second outer pipe to fluidly connect the first inner pipe to the second outer pipe. 19. The cross-over fluid coupling of claim 18, comprising three first conduits and three second conduits arranged in an alternating configuration with each other. 20. The cross-over fluid coupling of claim 19, wherein the first ends of the first conduits laterally surround the first ends of the second conduits. 21. The cross-over fluid coupling of claim 20, wherein the plurality of first conduits are identical to each other and to the plurality of second conduits, and wherein the second conduits are oriented 180 degrees relative to the first conduits. 22. The cross-over fluid coupling of claim 18, wherein:the second ends of the plurality of first conduits co-operate with each other to define a substantially circular second end inner flow area; andthe second ends of the plurality of second conduits co-operate with each other to define a substantially annular first end outer ring flow area laterally surrounding the second end inner flow area. 23. The cross-over fluid coupling of claim 18, wherein the first ends of the plurality of second conduits co-operate with each other to define a substantially circular first inner flow area and the first ends of the first conduits co-operate with each other to define a generally annular first outer ring flow area surrounding the first inner flow area. 24. The cross-over fluid coupling of claim 18, wherein fluid flowing through one of the first conduits defines a plurality of flow direction vectors at a plurality of locations axially spaced apart from each other along a length of the one of the first conduits, each flow direction vector taken at geometric centre point of the one of the first conduit at each axial location and wherein all of the flow vectors are at an angle of less than about 25 degrees relative to the axial direction.