Abstract: Apparatus and method for operating a subsea compression system. The subsea compression system comprising a separator, a compressor and a pump, wherein the compressor is operable for compression and discharge of gas that is separated from a well stream fed into the separator, and the pump is operable for pumping liquid that is separated from the well stream. The compressed gas is recycled from the compressor discharge side to the compressor intake side via a turbo-expander unit which is drivingly connected to the pump, the pump operable in response to circulation of compressed gas from the compressor discharge side to the compressor intake side.

Abstract: A subsea arrangement for connecting an end of a first tubular member to an end of a second tubular member, comprising a base structure, a landing structure which rests on or is configured to be fixed to the base structure using connecting members. The subsea arrangement further comprises a holding structure, to which the end of a tubular member is fixed and which is connectable to the landing structure by being lowered downwards onto the landing structure. The connecting members are configured to give the landing structure a limited movability in a horizontal plane in relation to the base structure so as to allow the landing structure to move horizontally in relation to the base structure and the holding structure, when the landing structure and the holding structure are guided into a correct position in relation to each other.

Abstract: System and method for axial support of a pump or compressor rotor shaft during start-up or shut-down of a vertical fluid displacement module for subsea operation including a motor and a pump or compressor. Lubrication fluid is momentarily supplied for hydrostatic operation of hydrodynamic thrust bearing(s) from a topside or land-based fluid supply via a flow control module arranged in conjunction with a subsea pressure control unit configured for controlling the supply and discharge of barrier and lubrication fluids to/from the fluid displacement module.

Abstract: A compensated barrier and lubrication fluids pressure regulation system for a subsea motor and pump module is disclosed. The system comprises a hydraulic fluid supply, a barrier fluid circuit, and a lubrication fluid circuit. Hydraulic fluid in the barrier fluid circuit is pre-tensioned towards a motor by a first separating pressure compensator which is responsive to the pressure in the lubrication fluid circuit and which applies the sum of the pressure in the lubrication fluid circuit and an inherent pre-tensioning pressure to the barrier fluid circuit. Hydraulic fluid in the lubrication fluid circuit is pre-tensioned towards a pump by a second separating pressure compensator which is responsive to a pumped medium pressure at a suction side or at a discharge side of the pump and which applies the sum of the pumped medium pressure and an inherent pre-tensioning pressure to the lubrication fluid circuit.

Abstract: A pipeline termination skid to be mounted to a pipeline end section in order to support a pipeline hub of the pipeline end section during and after the connection of the pipeline hub to a corresponding spool piece hub. The termination skid comprises a base frame having a downwardly directed opening for a pipeline end section, and at least one holding unit provided with a downwardly directed seat having a downwardly directed entrance opening so as to allow the pipeline end section to be moved into contact with the seat by being lifted upwards through the entrance opening. The holding unit is provided with a locking device for securing the pipeline end section to the holding unit in a lifted position in contact with the seat of the holding unit.

Abstract: A connection appliance for connecting an end section of a first conduit to an end section of a second conduit that is fixed to a holding unit of a subsea support structure. The connection appliance comprises a base structure that is connectable to a base frame of the subsea support structure; a sliding unit, to which the end section of the first conduit is to be fixed and which is slidably mounted to the base structure, and an actuating unit configured to act between the base structure and the sliding unit in order to push the sliding unit and the end section of the first conduit axially forwards in relation to the base structure so as to bring the end sections of the conduits into contact with each other.

Abstract: A subsea arrangement comprising a first subsea structure, a second subsea structure, and a clamp connector. The first subsea structure is provided with at least one coupling member which is designed to mate with a corresponding coupling member on a first side of the clamp connector so as to allow the clamp connector to be releasably connected and secured to the first subsea structure through these coupling members. The second subsea structure is provided with at least one coupling member which is designed to mate with a corresponding coupling member on an opposite second side of the clamp connector so as to allow the clamp connector to be releasably connected and secured to the second subsea structure through these coupling members.

Abstract: A separator arrangement in a multiphase production system. A closed separator container includes a top and a bottom, an inlet for production fluids at an inlet level and at least one outlet for at least partly separated liquid at a level lower than the inlet level. The container outlet is connectable to a liquid pump arranged downstream of the container. A gas accumulator is arranged for by-passing the pump. The gas accumulator includes an inlet end connectable to a top region of the container and an outlet end connectable to a discharge side of the pump for flow communication between the container and the discharge side of the pump. A region near the inlet end the gas accumulator is connected to a supply of injection liquid that is controllable via a valve to be injected to the discharge side of the pump via the gas accumulator. A method for gas by-pass of a liquid pump in a multiphase production system.

Abstract: A sealing element that includes a hollow body of metallic material and first and second male sealing members formed at a respective end of the body. The respective male sealing member has an external spherical contact surface designed for mating with a corresponding internal conical contact surface of a female sealing member so as to form a fluid-tight seal between the male sealing member and the female sealing member when their contact surfaces are pressed against each other. Also, a coupling device and a valve device provided with the sealing element.

Abstract: A tubular joint comprising: is provided. The tubular joint comprises first and second tubular members, a metallic seal ring between the tubular members and having sealing surfaces designed to mate with corresponding sealing surfaces of the tubular members to form a primary seal, an additional seal provided between the tubular members radially outwardly of the primary seal, a fluid channel having an outlet opening in an end surface of the first tubular member radially outwardly of said primary seal and radially inwardly of said additional seal, and annular seal members interposed between the seal ring and the tubular members radially outwardly of the primary seal and radially inwardly of said outlet opening and designed to allow fluid flow past the seal members in a radial direction inwards and to prevent fluid flow past the seal members in a radial direction outwards.

Abstract: A power cable termination arrangement is disclosed, comprising an electrically conductive closed-end sleeve (10) configured to be inserted on an end of the power cable. The sleeve is internally formed with a constriction (13) that separates a forward sleeve section (11) from a rearward sleeve section (14), wherein the forward sleeve section (11) is configured to establish, by radial crimping, electrical and mechanical connection between the sleeve and a bare end (5) of a power cable conductor (2), the rearward sleeve section (14) reaching from said constriction towards an insert end configured to receive the power cable in sealing contact between an insulated portion (3) of the power cable and a sealing ring (16) carried internally in the rear sleeve section (14).

Abstract: An apparatus for connecting or disconnecting a threaded coupling between two riser joints, comprising:—a frame (11) provided with a space (12) for receiving the coupling;—a first drive wheel set (20) carried by the frame and comprising one or more drive wheels (21, 22) driven by a first drive motor (23) for rotating a main nut of the coupling; and—a second drive wheel set (40) carried by the frame and comprising one or more drive wheels (41, 42) driven by a second drive motor (43) for rotating a locking nut of the coupling. The drive wheels of the second drive wheel set are located on a level above the drive wheels of the first drive wheel set to allow them to engage with and rotate the locking nut when the drive wheels of the first drive wheel set are in engagement with the main nut.

Abstract: A motor and a pump barrier fluids pressure regulation system for a subsea motor and pump module is disclosed. The pressure regulation system comprises—a barrier fluid circuit (10) providing fluid flow communication from a hydraulic fluid supply (8) to a first cavity in the motor and pump module,—a pressure controlled flow control valve (9) controlling the supply of hydraulic fluid to the barrier fluid circuit (10);—a second cavity arranged to receive hydraulic fluid from the hydraulic fluid supply via the first cavity, and—a pilot pressure circuit (11) comprising means for detecting and returning to the pressure controlled flow control valve (9) a differential pressure over a flow restriction (7; 13) connecting the first and second cavities.

Abstract: A barrier and lubrication fluids pressure regulation system for a subsea motor and pump module is disclosed, comprising a lubrication fluid circuit in flow communication with a hydraulic fluid supply via a first pressure reducing regulator (15); and a barrier fluid circuit in flow communication with the hydraulic fluid supply via a second pressure reducing regulator (14). The first pressure reducing regulator (15) is configured to reduce the supply fluid pressure in response to the pumped medium pressure at the suction side (4) or at the discharge side (5) of the pump, and the second pressure reducing regulator (14) is configured to reduce the supply fluid pressure in response to the output pressure of the first pressure reducing regulator (15). A pressure regulation unit is likewise disclosed, and arranged for housing the components of the barrier and lubrication fluids pressure regulation system in a pressurized vessel.

Abstract: A motor and pump barrier fluids pressure regulation system for a subsea motor and pump module comprising a motor and a pump is disclosed. The regulation system comprises a motor barrier fluid circuit hydraulically separating the motor from the pump, and a pump barrier fluid circuit hydraulically separating an internal structure of the pump from a pumped medium, wherein the fluid flow and pressure in each of the motor barrier fluid circuit and the pump barrier fluid circuit are controlled by pressure controlled on/off valves arranged in each circuit, the pressure controlled on/off valves being individually controllable in response to a detected difference in pressure between the pumped medium, on a suction side of the pump or on a discharge side of the pump, and the fluid in the motor barrier fluid circuit and the pump barrier fluid circuit.

Abstract: A connection arrangement for subsea connection of at least a first fluid conduit to a second fluid conduit. A supporting unit displaceably supports the connection arrangement against a supporting surface. A coupling device couples and secures the fluid conduits to the connection arrangement thereby interconnecting the fluid conduits to each other. A frame carries the coupling device and is slideably and/or pivotably mounted to the supporting unit so as to allow the frame and the associated coupling device to slide and/or pivot in relation to the supporting unit.

Abstract: A gate valve actuator including a stem that is movable linearly in an actuator housing connectable to the gate valve. The stem acts on the gate valve to shift the gate valve between open and closed positions, respectively. The stem is driven by a motor in a first direction into a steady state operation position. In the position the stem is biased in a second opposite direction towards a shutdown position by a spring member acting on the stem. A trigger mechanism is arranged for holding the spring member in a compressed state. The trigger mechanism includes an electrically controllable trigger that is arranged for release of the spring member in result of de-energizing the electrically controlled trigger. A method for shifting a gate valve between a steady state operation mode and a shutdown mode utilizing the gate valve actuator.

Abstract: An electrically operated valve actuator effective for shifting a valve (10) between open and closed positions is disclosed, the valve actuator comprising a movable member in the form of a valve stem (21) connected to a valve body (14), the movable member being driven by an electric motor (22) in linear motion between valve closing and valve opening positions, wherein electrical power to the motor is supplied via a current (25) control including a supplied current detection device. The movable member is designed for an idling length of travel (L) in the opening and closing directions during which the valve (10) is either fully open or fully closed, and the movable member is associated with buffer means (30) that during the idling length of travel gradually increases the torque and power required to move the movable member further in the open and closed positions of the valve (10), respectively.

Abstract: A sub sea actuator including an actuator housing. An activating element is movably arranged between activating and deactivating positions, respectively. A return spring is supported in the actuator housing to move the activating element into the deactivating position. The sub sea actuator includes an SMA element supported in the actuator housing and arranged with a temperature elevator configured to control a temperature of the SMA element. The SMA element acts on the activating element to move the activating element into the activating position against the force of the return spring in result of a rise in the temperature of the SMA element.

Abstract: A method and an apparatus for establishing a hydrate free regime in a subsea production flowline before discharging into the subsea production flowline a production flow of hydrate prone hydrocarbon product pursuant to a shutdown or at an initial start of production. The hydrate free regime is achieved by injecting into the flowline a heated water volume in advance of discharging the hydrocarbon product from the subsea production system.