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According to some aspects, a tug and barge arrangement is provided that is configured with an articulated conduit system for transferring a fuel gas (e.g., natural gas) between the tug and barge. In some embodiments, an articulated conduit system is provided that comprises a plurality of conduits fl

According to some aspects, a tug and barge arrangement is provided that is configured with an articulated conduit system for transferring a fuel gas (e.g., natural gas) between the tug and barge. In some embodiments, an articulated conduit system is provided that comprises a plurality of conduits fluidically interconnected by rotatable joints configured to permit positional alterations of the fluid conduits that result from differential movement between a tug and barge, such as relative vertical displacement between the tug and barge and/or relative rotation between the tug and barge about a forward-aft axis of the tug.

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1. An articulated tug and barge (ATB) arrangement comprising: a tug;a barge; andan articulated conduit system for transferring a fuel gas between the tug and the barge,wherein the tug is positioned within a notch at the stern of the barge, and wherein the tug is configured to push the barge through

1. An articulated tug and barge (ATB) arrangement comprising: a tug;a barge; andan articulated conduit system for transferring a fuel gas between the tug and the barge,wherein the tug is positioned within a notch at the stern of the barge, and wherein the tug is configured to push the barge through a pin connection, andwherein the articulated conduit system comprises a first end on the tug and a second end on the barge, wherein the first and second ends are connectable through a plurality of rigid conduits fluidically interconnected by swivel joints that accommodate different movement between the tug and barge, wherein the swivel joints comprise i) at least three swivel joints each having an axis of rotation substantially parallel to a forward-aft axis of the tug such that each of the at least three swivel joints is rotatable about its axis of rotation in a substantially port-starboard plane, wherein together the at least three swivel joints are rotatable in their substantially port-starboard planes to accommodate relative vertical displacement between the tug and barge and relative rotation between the tug and barge about the forward-aft axis of the tug, and ii) at least one swivel joint having an axis of rotation substantially parallel to a port-starboard axis of the tug such that the at least one swivel joint is rotatable about its axis of rotation in a substantially forward-aft plane to accommodate pitch motion between the tug and barge. 2. The ATB arrangement of claim 1, wherein the swivel joints further comprise at least one swivel joint configured to permit at least a portion of the conduit system to be rotated between a stowed position and an operational position that extends from the tug to the barge. 3. The ATB arrangement of claim 2, wherein the at least one swivel joint configured to permit rotation between the stowed position and the operational position that extends from the tug to the barge has an axis of rotation substantially parallel to a vertical axis of the tug such that the at least one swivel joint is rotatable about its axis of rotation in a yaw plane of the tug to permit the portion of the conduit system to be rotated between the stowed position and the operational position that extends from the tug to the barge. 4. The ATB arrangement of claim 1, wherein the swivel joints further comprise at least one swivel joint configured to permit at least a portion of the conduit system to be rotated between a stowed position and an operational position that extends from the barge to the tug. 5. The ATB arrangement of claim 4, wherein the at least one swivel joint configured to permit rotation between the stowed position and the operational position that extends from the barge to the tug has an axis of rotation substantially parallel to a vertical axis of the barge such that the at least one swivel joint is rotatable about its axis of rotation in a yaw plane of the barge to permit the portion of the conduit system to be rotated between the stowed position and the operational position that extends from the barge to the tug. 6. The ATB arrangement of claim 1, wherein the pin connection is a single degree of freedom pin connection within the barge notch, that establishes a transverse, fixed axis between the tug and barge, about which the tug and barge are allowed pitch rotation. 7. The ATB arrangement of claim 1, wherein the barge is configured for storing the fuel gas as a liquid and to direct boil off gas produced from the liquid through the articulated conduit system to the tug to serve as fuel gas for the tug. 8. The ATB arrangement of claim 1, wherein the barge is configured for storing the natural gas as liquid natural gas (LNG), and to direct boil off gas produced from the LNG through the articulated conduit system to the tug to serve as fuel gas for the tug. 9. The ATB arrangement of claim 1, wherein the system is secured at the first and second ends through joints that fluidically interconnect the system with first and second immobilized pipe segments on the tug and barge, respectively. 10. The ATB arrangement of claim 9, wherein the first immobilized pipe segment is in fluid communication with a fuel gas intake system of the tug. 11. The ATB arrangement of claim 10, wherein the fuel gas intake system comprises a main engine fuel supply conduit. 12. The ATB arrangement of claim 9, wherein the second immobilized pipe segment is in fluid communication with a fuel tank on the barge. 13. The ATB arrangement of claim 1, wherein the articulated conduit system is configured to enable the fuel gas to power a propulsion system of the tug. 14. The ATB arrangement of claim 11, wherein the articulated conduit system is configured to enable the fuel gas to serve as fuel for combustion in an engine of the propulsion system. 15. The ATB arrangement of claim 14, wherein the engine is a propulsion engine that mechanically operates a propeller of the tug. 16. The ATB arrangement of claim 14, wherein the engine is coupled to an electric generator that powers an electric propulsion motor of the tug. 17. The ATB arrangement of claim 1, wherein the fuel gas is natural gas. 18. A method of operating an articulated tug and barge (ATB) arrangement comprising a tug, a barge, and an articulated conduit system for transferring a fuel gas between the tug and the barge, wherein the tug is positioned within a notch at a stern of the barge, and wherein the tug is configured to push the barge through a pin connection, and wherein the articulated conduit system comprises a first end on the tug and a second end on the barge, wherein the first and second ends are connected through a plurality of rigid conduits fluidically interconnected by swivel joints that accommodate different movement between the tug and barge, wherein the swivel joints comprise i) at least three swivel joints each having an axis of rotation substantially parallel to a forward-aft axis of the tug such that each of the at least three swivel joints is rotatable about its axis of rotation in a substantially port-starboard plane, wherein together the at least three swivel joints are rotatable in their substantially port-starboard planes to accommodate relative vertical displacement between the tug and barge and relative rotation of the tug and barge about the forward-aft axis of the tug, and ii) at least one swivel joint having an axis of rotation substantially parallel to a port-starboard axis of the tug such that the at least one swivel joint is rotatable about its axis of rotation in a substantially forward-aft plane to accommodate pitch motion between the tug and barge, the method comprising: transferring the fuel gas between the tug and barge through the articulated conduit system. 19. The method of claim 18, wherein the articulated conduit system is secured at the first end through a joint that fluidically connects the articulated conduit system with a fuel gas intake system of the tug, and wherein the method comprises transferring the fuel gas from the barge through the articulated conduit system to the fuel gas intake system of the tug. 20. The method of claim 19, wherein the fuel gas intake system is configured to supply fuel gas to an engine of a propulsion system of the tug, and wherein the method further comprises supplying the fuel gas to the engine through the fuel gas intake system to power the engine. 21. The method of claim 19, wherein the method further comprises transferring fuel gas from the barge to the tug, wherein the fuel gas transferred to the tug is boil-off gas produced from a liquid stored on board the barge. 22. The method of claim 21, wherein the liquid is liquid natural gas (LNG). 23. The method of claim 18, wherein the fuel gas is natural gas. 24. A method of connecting an articulated conduit system for transferring a fuel gas between a tug and barge of an articulated tug and barge (ATB) arrangement, wherein the tug is positioned within a notch at the stern of the barge, and wherein the tug is configured to push the barge through a pin connection, and wherein, when connected, the articulated conduit system comprises a plurality of rigid conduits fluidically interconnected by swivel joints that accommodate different movement between the tug and barge, wherein the swivel joints comprise i) at least three swivel joints each having an axis of rotation substantially parallel to a forward-aft axis of the tug such that each of the at least three swivel joints is rotatable about its axis of rotation in a substantially port-starboard plane, wherein together the at least three swivel joints are rotatable in their substantially port-starboard planes to accommodate relative vertical displacement between the tug and barge and relative rotation of the tug and barge about the forward-aft axis of the tug, and ii) at least one swivel joint having an axis of rotation substantially parallel to a port-starboard axis of the tug such that the at least one swivel joint is rotatable about its axis of rotation in a substantially forward-aft plane to accommodate pitch motion between the tug and barge, the method comprising: i) repositioning a tug portion of the articulated conduit system from a first stowed position on the tug to a first operational position, wherein in the first stowed position the tug portion has a proximal end and a distal end on the tug, and in the first operational position the tug portion has a proximal end on the tug and a distal end extending toward the barge;ii) repositioning a barge portion of the articulated conduit system from a second stowed position on the barge to a second operational position, wherein in the second stowed position the barge portion has a proximal end and a distal end on the barge, and in the second operational position the barge portion has a proximal end on the barge and a distal end extending toward the tug; andiii) fluidically connecting the distal end of the tug portion when in the first operational position to the distal end of the barge portion when in the second operational position. 25. The method of claim 24, wherein a plurality of the rigid conduits are fluidically connected by at least one swivel joint configured to permit the tug portion to be repositioned by being rotated from the first stowed position to the first operational position, and at least one swivel joint configured to permit the barge portion to be repositioned by being rotated from the second stowed position to the second operational position. 26. The method of claim 25, wherein the at least one swivel joint configured to permit rotation of the tug portion has an axis of rotation substantially parallel to a vertical axis of the tug such that the at least one swivel joint is rotatable about its axis of rotation in a yaw plane of the tug to permit the tug portion to be rotated between the first stowed position and the first operational position. 27. The method of claim 25, wherein the at least one swivel joint configured to permit rotation of the barge portion has an axis of rotation substantially parallel to a vertical axis of the barge such that the at least one swivel joint is rotatable about its axis of rotation in a yaw plane of the barge to permit the barge portion to be rotated between the second stowed position and the second operational position. 28. The method of claim 24, wherein the articulated conduit system is configured such that, at each relative vertical position of a pin connection of the tug within a vertical channel in a notch of the barge, up to and including 15 vertical feet from the bottom of the barge, the distal end of the tug portion is connectable in step iii) to the distal end of the barge portion. 29. The method of claim 28, wherein the pin connection is a single degree of freedom pin connection within the barge notch, that establishes a transverse, fixed axis between the tug and barge, about which the tug and barge are allowed pitch rotation. 30. The method of claim 24, wherein the articulated conduit system is configured such that, at each rotational position of the tug about its forward-aft axis, up to and including ±20° of rotation relative to the barge, the distal end of the tug portion is connectable in step iii) to the distal end of the barge portion.