A pressure compensator for providing pressure compensation for a chamber of a subsea device is provided. The pressure compensator has an enclosure with at least an outer wall. A first compensation chamber is provided inside the enclosure. A flow connection from the first compensation chamber towards the chamber of the subsea device is further provided. As second compensation chamber is provided inside the enclosure. First and second separating walls are arranged inside the enclosure. A first bellows portion of the first separating wall and a second bellows portion of the second separating wall are deformable to provide pressure compensation between the chamber of the subsea device and a second inner volume around which the second separating wall extends.

A subsea support system comprises: at least one component (501) which is configured to be fixedly connected to a pressure conductor (101) in a seabed; and a subsea support (601) which is configured to compliantly support the at least one component (501); wherein, when the at least one component (501) is fixedly connected to the pressure conductor (101), substantially all of a mechanical load (T) which is applied to the subsea support (601) is transmitted by the subsea support (601) to the seabed while the at least one component (501) is substantially free of the mechanical load and remains fixed relative to the pressure conductor (101).

A control system and a method arranged for redundant supply of power to active magnetic bearings adapted for support of a shaft or rotor in a rotating machine. The control system comprises at least two control modules which are supplied external power. The control modules are connectable to a base module comprising a first set of power and sensor signal pathways which can be switched in to provide contact between a first control module and the active magnetic bearings, and a second set of power and sensor signal pathways which can be switched in to provide contact between a second control module and the active magnetic bearings. Each control module comprises a switching mechanism which is controllable for connecting the control modules one at a time to the active magnetic bearings via the first set or via the second set of power and sensor signal pathways.

A device is for reducing the load on a wellhead casing from a bending moment generated by a horizontal load component from a well element arranged over a wellhead. A supporting frame is connected to an upper portion of the wellhead casing and projects outwards from the center axis of the wellhead casing and is provided with an abutment which rests supportingly against a base at a radial distance from the wellhead casing. The supporting frame is arranged to absorb a portion of said bending moment.

A device is for reducing the load on a wellhead casing from a bending moment generated by a horizontal load component from a well element arranged over a wellhead. A supporting frame is connected to an upper portion of the wellhead casing and projects outwards from the center axis of the wellhead casing and is provided with an abutment which rests supportingly against a base at a radial distance from the wellhead casing. The supporting frame is arranged to absorb a portion of said bending moment.

Seals for pressure control fittings are disclosed, where such pressure control fittings are located at a wellhead, for example. Embodiments of cam lock seals, a spring-driven ball race seal and wedge seals are disclosed.

A christmas tree assembly for a subsea hydrocarbon extraction facility, the christmas tree assembly includes a fluid pipeline and a sensor assembly comprising a plurality of sensors configured to monitor a plurality of properties relating to hydrocarbon fluid flow through the fluid pipeline. The sensor assembly includes a differential pressure sensor that is disposed at one or more of across a choke, around a bend or restriction in the pipeline or a dedicated flow restrictor integrated within the pipeline, and a bulk density sensor that is disposed in one or more of a blind T, before or after a choke or in an upwards section of the flow pipeline.

A christmas tree assembly for a subsea hydrocarbon extraction facility, the christmas tree assembly includes a fluid pipeline and a sensor assembly comprising a plurality of sensors configured to monitor a plurality of properties relating to hydrocarbon fluid flow through the fluid pipeline. The sensor assembly includes a differential pressure sensor that is disposed at one or more of across a choke, around a bend or restriction in the pipeline or a dedicated flow restrictor integrated within the pipeline, and a bulk density sensor that is disposed in one or more of a blind T, before or after a choke or in an upwards section of the flow pipeline.

An apparatus including a robotic manipulator coupled to an oilfield device to facilitate support operations. The robotic manipulator can include a tool for interacting with components of the oilfield device, and the robotic manipulator can provide three translational degrees of freedom of the tool with respect to the oilfield device. Additional systems, devices, and methods are also disclosed.

A subsea blind stab (100), comprises a stabbing part (110) for insertion into a hot stab receptacle, the stabbing part (110) including a housing, a central rod (150) slidably arranged within the housing and at least one fluid communication line from the external side of the stabbing part (110) to an internal fluid communication line (180) within the rod (150). The at least one fluid communication line is open in a first position of the rod (150) relative the housing and closed in a second position of the rod (150) relative the housing. The stab (100) further comprises a hollow body (120) attached to one end of the stabbing part (110); a piston (130) slidably arranged in the hollow body (120), with a spring element (160) arranged between the piston (130) and a spring attachment element (170) connected to the body. A first side of the piston (130) forms a fluid chamber (140) in the hollow body. The fluid chamber (140) is in fluid communication with the internal fluid communication line in the rod, and a second side of the piston (130) is exposed to a pressure of the surrounding environment.