Method for connecting a termination hub (201a) to a porch hub (101a) at a subsea location by using a subsea fluid connection system (1). The connection system (1) comprises a porch part (100) with the porch hub (101a), a termination part (200) with the termination hub, and a connector (300). The method comprises a) landing the termination part (200) on the porch part (100) at a subsea location; b) moving the termination hub (201a) of the termination part (200) into alignment with the porch hub (101a) of the porch part (100); c) with the connector (300), connecting the termination hub (201a) to the porch hub (101a). The method further comprises d) after step c), actuating a moment arrestor arrangement (400), thereby further arresting the termination part (200) to the porch part (100). A subsea fluid connection system is also disclosed.

A female undersea hydraulic coupling member is equipped with a plurality of pressure-energized metal seals configured to seal between the body of the female member and the probe of a corresponding male hydraulic coupling member in response to ambient hydrostatic pressure and/or hydraulic fluid pressure. Pressure-energized metal seals may also be provided to seal between the body of the female coupling member and a removable seal retainer or seal cartridge. In one particular preferred embodiment, the pressure-energized seals are back-to-back metal C-seals separated by annular seal supports having a generally T-shaped cross section and retained on one or more shoulders in the body of the female member by a removable seal cartridge.

A female undersea hydraulic coupling member is equipped with a plurality of pressure-energized metal seals configured to seal between the body of the female member and the probe of a corresponding male hydraulic coupling member in response to ambient hydrostatic pressure and/or hydraulic fluid pressure. Pressure-energized metal seals may also be provided to seal between the body of the female coupling member and a removable seal retainer or seal cartridge. In one particular preferred embodiment, the pressure-energized seals are back-to-back metal C-seals separated by annular seal supports having a generally T-shaped cross section and retained on one or more shoulders in the body of the female member by a removable seal cartridge.

A male-male hot stab assembly connectable to a flying receptacle is described. The male-male hot stab assembly comprises a first hot stab comprising a first hot stab male front end and a first hot stab base end, a second hot stab comprising a second hot stab male front end and a second hot stab base end, where the first hot stab and second hot stab are connected to each other by connecting the first hot stab base end to the second hot stab base end. In addition, a flying receptacle configured to receive a first hot stab of the hot stab assembly is described, which comprises a receptacle first end, configured to receive a first hot stab, a channel allowing the first hot stab to be inserted into the flying receptacle, a receptacle second end, and an ROY-handle. Further described is a subsea fluid connection system.

A male-male hot stab assembly connectable to a flying receptacle is described. The male-male hot stab assembly comprises a first hot stab comprising a first hot stab male front end and a first hot stab base end, a second hot stab comprising a second hot stab male front end and a second hot stab base end, where the first hot stab and second hot stab are connected to each other by connecting the first hot stab base end to the second hot stab base end. In addition, a flying receptacle configured to receive a first hot stab of the hot stab assembly is described, which comprises a receptacle first end, configured to receive a first hot stab, a channel allowing the first hot stab to be inserted into the flying receptacle, a receptacle second end, and an ROY-handle. Further described is a subsea fluid connection system.

A hot tap assembly for accessing a subsea fluid system includes a landing structure configured to releasably attach to a subsea fluid conduit of the subsea fluid system, a clamp assembly positionable on the landing structure, where in the clamp assembly includes a hot tap clamp including a first jaw and a second jaw, wherein a first annular seal assembly and a second annular seal assembly are disposed on an engagement surface of the second jaw, and a drill assembly positionable on the landing structure, wherein the drill assembly includes a drill disposed in a central conduit that is insertable through a central passage formed in the second jaw of the clamp assembly, wherein the hot tap clamp is configured to actuate between an open position configured to receive the subsea fluid conduit and a closed position configured to sealingly engage the subsea fluid conduit with the first seal assembly and the second seal assembly of the clamp assembly.

A hot tap assembly for accessing a subsea fluid system includes a landing structure configured to releasably attach to a subsea fluid conduit of the subsea fluid system, a clamp assembly positionable on the landing structure, where in the clamp assembly includes a hot tap clamp including a first jaw and a second jaw, wherein a first annular seal assembly and a second annular seal assembly are disposed on an engagement surface of the second jaw, and a drill assembly positionable on the landing structure, wherein the drill assembly includes a drill disposed in a central conduit that is insertable through a central passage formed in the second jaw of the clamp assembly, wherein the hot tap clamp is configured to actuate between an open position configured to receive the subsea fluid conduit and a closed position configured to sealingly engage the subsea fluid conduit with the first seal assembly and the second seal assembly of the clamp assembly.

A connection device for mating and making up a subsea connection. The connection device includes a first pipeline end which is fixable to an end of a subsea pipeline, a first connection element which is connected to the first pipeline end, and a second connection element which is connected to the first connection element. The first connection element is rotatably connected to the second connection element.

De-trenching apparatus (100) for extracting a buried line, such as a cable or pipeline, is disclosed. The de-trenching apparatus comprises a channel (112) configured to receive a buried line to be extracted, the channel comprising a first flared opening (114) at a front end of the de-trenching apparatus and a second flared opening (115) at the rear end of the de-trenching apparatus, the first and second flared openings each having a curved surface (111) configured to support the line during extraction, and material removal means for removing material from around the buried line ahead of the de-trenching apparatus.

De-trenching apparatus (100) for extracting a buried line, such as a cable or pipeline, is disclosed. The de-trenching apparatus comprises a channel (112) configured to receive a buried line to be extracted, the channel comprising a first flared opening (114) at a front end of the de-trenching apparatus and a second flared opening (115) at the rear end of the de-trenching apparatus, the first and second flared openings each having a curved surface (111) configured to support the line during extraction, and material removal means for removing material from around the buried line ahead of the de-trenching apparatus.