Abstract: An elevator for gripping and lifting a riser joint or several interconnected riser joints of a completion and work over riser. A body includes a through bore for receiving a production pipe of a riser joint. The through bore is accessible via a longitudinal opening in the body. The body includes at least one locking device including a hydraulic cylinder. A piston rod of the hydraulic cylinder is moveable to and fro between an unlocking position, in which the piston rod allows a production pipe of a riser joint to pass into or out of the through bore via the longitudinal opening, and a locking position, in which the piston rod prevents a production pipe received in the through bore from passing out of the through bore via the longitudinal opening.

Abstract: An arrangement for heat transport used for thermally insulating, or cooling, one or several elements. A casing is arranged to enclose a medium having heat-storing or cooling capacity. The casing has an internal space for receiving the element or elements and the medium with the medium surrounding the element or elements. The arrangement includes guides arranged in the internal space of the casing so as to guide the medium in the internal space such that a circulation and mixing of the fluid will be generated essentially throughout the internal space under the action of occurring temperature differences in the medium, whereby the natural tendency for temperature stratification of the medium is counteracted or eliminated. A corresponding method, the use of an arrangement for protecting a subsea installation or a part thereof from cooling, and use of an arrangement for efficient cooling an electrical appliance.

Abstract: A subsea arrangement comprising an external casing and a pressure equalizing valve for equalization of the fluid pressure in an internal space of the casing. The pressure equalizing valve is provided with a valve body including a base section displaceably received in an opening provided in the casing; and a valve member secured to the base section and arranged inside the casing, the valve member facing a valve seat surrounding said opening. The valve body is displaceable upwards, under the effect of an external fluid pressure, from a resting position, in which the valve member prevents fluid flow into and out of said internal space, to a raised position, in which the valve member allows fluid flow from the surroundings into said internal space for equalization of the fluid pressure therein when the subsea arrangement is lowered into the sea.

Abstract: A subsea arrangement including at least one canister including a chamber accommodating at least one circuit breaker. The chamber is filled with a gaseous dielectric medium constituting a quenching medium for the at least one circuit breaker in the chamber. The pressure in the chamber is balanced against ambient sea water pressure by a pressure balancer, which includes at least one pressure container containing a pressurized gaseous medium of a same type as the gaseous medium in the chamber. The pressure container is connected to the chamber via a control valve, which is arranged to be controlled by the ambient pressure so as to feed pressurized gaseous medium from the pressure container into the chamber when the ambient pressure increases in order to maintain the pressure in the chamber equal to the ambient pressure.

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 subsea arrangement comprising an external casing and a pressure equalizing valve for equalization of the fluid pressure in an internal space of the casing. The pressure equalizing valve comprises a swing arm and a valve member arranged inside the casing. The swing arm carries the valve member and is pivotable about a pivot axis, under the effect of an external fluid pressure acting on the valve member, from a resting position, in which the valve member covers an opening provided in the casing and prevents fluid flow through this opening, to a raised position, in which the valve member uncovers said opening and allows fluid flow through it from the surroundings into said space for equalization of the fluid pressure therein when the arrangement is lowered into the sea. The swing arm is pivotable from the raised position to the resting position under the effect of gravity.

Abstract: A method for volume compensation of a fluid-filled first chamber accommodating a first electrical appliance that is electrically connected by a high-voltage electrical connector to a second electrical appliance located in a fluid-filled second chamber. The first chamber is volume compensated to the second chamber via the electrical connector by a volume compensating arrangement integrated in the electrical connector. A high-voltage electrical connector with a volume compensating arrangement and an electrical assembly provided with such a connector.

Abstract: A gas and oil recovery system including a vessel, platform or rig, with a rig floor, a riser including a pipe that extends from the vessel, platform or rig to a x-mas tree on top of a well head and via which a wire or coiled tubing is fed down into a well. The riser is movable through an opening in the rig floor, and a surface flow head connected to the riser and to a wire line or coiled tubing equipment. The surface flow head is arranged to be run through the opening in the rig floor.

Abstract: An arrangement related to subsea electric power distributing AC-system and adapted for a subsea application. The arrangement is enclosed in a watertight casing. The casing exposes a main power input connection, adapted for watertight co-ordination with a first subsea cable and a main power output connection, adapted for a watertight co-ordination with a second subsea cable. The second subsea cable is adapted for a power supply to an AC-current and AC-voltage adapted device. The arrangement includes interconnected: a voltage regulator connected to the first cable, and a NO-load switching unit connected to the second cable, and a control unit. The control unit is adapted, in a first operative mode, to regulate the output AC-voltage from the voltage regulator towards and to zero, or at least almost to zero, and in a second subsequent operative mode, to bring the NO-load switching unit from an ON-position to an OFF-position or vice versa.

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 high voltage subsea electrical penetrator. A first housing part is connectable to a second housing part. The first and second housing parts in connected mode define a seat for accommodation of a bushing including a conductor pin arranged in an insulator body. The first and second housing parts each have a part-spherical seat surface supporting a corresponding region of the bushing. The bushing includes a material of relatively high compressive strength, in the form of a polymeric material or a ceramic material, that is molded into spherical outer shape about a bulbous portion of the conductor pin, and clamped as a unitary form-fitting element in the seat upon connection of the first and second housing parts.

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 connector arrangement in a submersible electrical assembly including an electric equipment or electrical power consumer housed in an enclosure filled with conductive fluid. Power is supplied to the power consumer in a connecting area defined through a dielectric containment located inside the enclosure, and to a penetrator comprising power cable termination components enclosed in a penetrator housing extending from a rear end to a forward end of the penetrator. The rear end is arranged to seal about a power cable receivable in the housing from the rear end. The forward end exposes a connector arranged for electrically connecting the power consumer to the penetrator. The penetrator housing in the forward end is extended beyond the connector through a housing section projecting into the power consumer enclosure and terminated in a forward end by an end wall. The end wall has a passage sealable about a power consumer conductor mateable with the connector of the penetrator in a connecting mode.

Abstract: A subsea switchgear apparatus including a frame, at least one electrical power inlet mounted to the frame, at least one electrical power outlet mounted to the frame, a distribution chamber mounted to the frame, and at least one canister mounted to the frame. The at least one canister includes a chamber accommodating at least one high voltage circuit breaker. Electrical connections are arranged in the distribution chamber for electrically connecting a respective circuit breaker of a canister to an associated power inlet and power outlet of the switchgear apparatus. The chamber of the respective canister is separated from the distribution chamber by a pressure barrier.

Abstract: A hybrid process control system including electrical transmission of power to a sub-sea hydraulic power unit, which in turn provides hydraulic power for control of hydraulic actuators. A circulation system using small bore tubing in the umbilical cord in combination with a traditional topside hydraulic power unit provides for active control of hydraulic fluid quality with respect to contamination caused by the sub-sea hydraulic actuators, especially process gas from down hole safety valves. Thus, a more economical power transmission is achieved without reduction of fluid quality, which is essential to system integrity and reliability. Also, a significant enhancement of power transmission without a dramatic increase in the size of hydraulic supply and return lines is achieved. Fluid environmental issues are reduced to a negligible aspect.

Abstract: A method for measuring a capacitance using a capacitance meter. The capacitance meter includes an AC power source with a controllable frequency which is fed to a capacitor to measure its capacitance. A first measurement of the capacitance is performed by the capacitance meter using a first frequency. When the first measurement of the capacitance indicates the capacitance is below a threshold capacitance a lower capacitance measurement is performed in the capacitance meter, using a second measurement of the capacitance using a second frequency. When the first measurement of the capacitance indicates the capacitance is above a threshold capacitance, a higher capacitance measurement is performed in the capacitance meter, using a second measurement of the capacitance using a third frequency, the third frequency being lower than the second frequency.

Abstract: A sealing element including a tube-shaped body of metallic material and first and second male sealing members arranged at a respective end of the body. At least two intermediate members are arranged in series in the body between the first and second male sealing members. Each one of the intermediate members is compressible so as to be capable to store elastic energy when the body is subjected to axial compression and includes a protuberance arranged in the body and extending around the center axis of the body. A coupling device provided with such a sealing element.

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: 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 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.