Abstract: A method for evaluation of deleterious phase content and distribution in stainless steels and nickel-based alloys based on the correlation between measured open circuit potentials and volume fraction of deleterious phases is disclosed, in conjunction with a portable equipment and apparatus for carrying out the method.

Abstract: A hydraulic tool for use with a clamp connector where a first clamping element and a second clamping element of the clamp connector are pivotable towards each other into a closed position by exerting a pulling force on an operating shaft and a pushing force on a spacer sleeve, and where said first and second clamping elements are lockable in said closed position by tightening a locking nut against a shoulder on the spacer sleeve. The tool includes a pulling element; a hydraulic power unit for moving the pulling element in relation to the spacer sleeve and thereby allow the hydraulic tool to exert a pulling force on the operating shaft and a pushing force on the spacer sleeve; a rotatable actuating member with a socket engageable with the locking nut; and a drive motor for rotating the actuating member to allow the actuating member to rotate the locking nut.

Abstract: A vertical connection system for subsea connection of a first tubular member to a second tubular member, the system comprising a lower coupling member comprising an upright casing which encloses a liquid-filled space, wherein a hub of the first tubular member is fixed to the casing at an upper end thereof and the first tubular member extends through said space; and an upper coupling member, which comprises a guide frame configured to slidingly receive said casing when the upper coupling member is lowered downwards onto the lower coupling member, wherein a hub of the second tubular member is fixed to the upper coupling member. The guide frame is provided with a layer of thermally insulating material on its outside. The liquid-filled space is delimited downwards by a bottom wall formed by thermally insulating material or covered by a layer of thermally insulating material.

Abstract: A water treatment subsea installation and method are disclosed, adapted for scaling prevention and treatment of raw seawater into process water suitable for use in subsea hydrocarbon production. The water treatment installation comprises a seawater inlet to a primary filtration unit wherein a filtration membrane separates a receiving chamber from a permeate chamber having an outlet for treated water. A pump is installed in fluid flow communication with the treated water outlet, a recirculation loop feeding a portion of the treated water via a subsea electro-chlorinator back to the water stream upstream or downstream of the membrane of the primary filtration unit, and a secondary filtration unit is installed in the treated water stream between the primary filtration unit and the electro-chlorinator.

Abstract: A horizontal connection system including: a first holding unit, to which a first hub is fixed; a second holding unit, to which a second hub is fixed; a heat bank including a casing with a rear part secured to the first holding unit and a front part releasably connectable to the rear part; and a clamp connector secured to the first holding unit and received inside the heat bank. The parts of the casing are temporarily fixed to each other by connecting members extending between the parts on the outside thereof. The front part of the casing is provided with fastening members configured to come into engagement with associated fastening members on the second holding unit, to thereby allow the front part to be secured to the second holding unit, when the front part and the second holding unit are brought into contact with each other.

Abstract: A method and a system for pressure regulation of well fluid produced from a hydrocarbon well in a hydrocarbon production field. The system comprises a pump arranged on a well head in fluid communication with a process fluid passage from the well, the pump arranged for receiving well fluid produced from the well and to deliver the fluid to downstream piping or equipment. The pump comprises a motor/generator unit operable as a generator as the pump is driven by well fluid in power generation mode, and wherein the pump is driven in power consumption mode by operation of the motor/generator unit as a motor.

Abstract: A subsea umbilical termination assembly comprising: an umbilical termination head fixed to the end of a subsea umbilical; and an electrical and/or optical distribution unit comprising a base frame and several connectors mounted to the base frame, wherein each connector is electrically connected to an electrical cable of the subsea umbilical via the umbilical termination head or optically connected to an optical cable of the subsea umbilical via the umbilical termination head. The umbilical termination head is mounted in a space provided inside the base frame of the distribution unit.

Abstract: The present disclosure relates to an apparatus for gravity separation, which comprises a plurality of gravity separation modules. Each of the gravity separation modules comprises an inlet, a first outlet, a first conduit connecting the inlet and the first outlet, a second outlet located vertically different from the first outlet, a second conduit in communication with the second outlet, and a plurality of third conduits connecting the first conduits and the second conduits. The present disclosure also relates to a corresponding method for gravity separation.

Abstract: A termination arrangement for use in a horizontal connection system for subsea connection of a first tubular member to a second tubular member, the termination arrangement including a base structure with a horizontal tubular body. The first tubular member is rotatably mounted to the tubular body through an annular bearing. An internal fluid chamber accommodating a liquid having heat-storing capacity is formed inside the tubular body and delimited at one end by the annular bearing and at another end by a rear end wall. A section of the first tubular member extends through the fluid chamber and is in contact with the liquid in the fluid chamber so as to allow the liquid to delay cooling of this section of the first tubular member by means of heat stored in the liquid.

Abstract: Methods and arrangements are provided for release of an ROV operable subsea clamp connector, the clamp connector comprising at least two clamp segments hinged to move pivotally, and a drive screw connecting the clamp segments by threaded engagement with trunnions arranged rotatable in the pivoting ends of the clamp segments, the threads of the drive screw and trunnions turned such that the trunnions travel along the drive screw in mutually opposite directions when the drive screw is turned. An axial bore in the drive screw is adapted for accommodation of a waterjet cutting tool having a sideways pointing nozzle in a forward end, the waterjet cutting tool rotatable inside the bore while feeding high-pressure water through the nozzle, towards the wall of the drive screw until the wall of the drive screw is cut through.

Abstract: A method for deployment of discrete lengths of flexible jumper pipes for installation subsea is provided, comprising coupling the jumper pipes together end-to-end thus forming a flexible train of jumper pipes, and winding the train of jumper pipes on a drum suitable for transport to a deployment site by a pipe-laying vessel. On site, the train of jumper pipes is unreeled from the drum until the first jumper pipe is lowered into the sea, then the drum is halted and the trailing end of the first jumper pipe is detached from the leading end of the second jumper pipe in the train of jumper pipes. The trailing end of the first jumper pipe is shifted to a lowering wire, and the first jumper pipe is lowered to the sea bottom. The process is repeated until the discrete lengths of flexible jumper pipes are individually lowered into the sea.

Abstract: A control system is disclosed for an electric actuator comprising an electric motor, an external supply of electric energy, an energy storage device and a first motor control module which controls the supply of energy to the motor in normal operation. A second motor control module controls the supply of energy to the motor in fail-safe mode. The first motor control module and the second motor control module are connected in parallel via a fail-safe switch which is arranged to override the control executed by the first motor control module to set the control system in fail-safe mode by activation of the second motor control module in either case of: the energy level in the energy storage device reaching, or falling below, a predetermined value, or failure in the external energy supply, or in response to an operator command. A method of controlling an electric actuator in a control system is also disclosed.

Abstract: An electrical penetrator assembly is shown, configured to feed electrical voltage and current through a wall separating a first volume and a second volume, which may have different pressure and/or may be filled with different fluids. The connector comprises a wall or partition having a through opening. An electrical conductor surrounded by a tubular insulator body passes the opening through the wall. A conductive or semi-conductive coating is arranged on the exterior of the insulator body, the coating surrounding the insulator body for a portion of its length, the coating in electrical contact with the wall, wherein the coated portion of the insulator body is shaped to displace the electric field around the conductor away from the wall and reduce the electric field strength around the insulator body by increasing the electric field strength inside the insulator body.

Abstract: A horizontal connection arrangement for subsea connection of a first hub arranged on a first subsea module to a second hub arranged on a second subsea module. The first hub is fixed to a first holding unit and the second hub is fixed to a second holding unit. A sliding unit is slidably mounted to the first holding unit so as to be horizontally moveable in relation to the first holding unit. A connector for connecting and securing the first hub to the second hub is mounted to the sliding unit and horizontally moveable together with the sliding unit between a retracted position, in which an outer end of the first hub projects beyond a front side of the connector, and an advanced position, in which the outer end of the first hub is received inside the connector.

Abstract: A hydraulic tool for moving a first structural element in the axial direction in relation to a second structural element. The tool comprises a ring-shaped frame configured for insertion into a gap between an annular shoulder on the first structural element and an annular shoulder on the second structural element; and hydraulic power members fixed to and distributed along said frame, the power members being configured to exert an axial pushing force against one of said annular shoulders to thereby move said structural elements apart. The frame comprises first and second arc-shaped sections, each of which having a hinged first end and an opposite second end. The arc-shaped sections are pivotable between an open position, in which their second ends are spaced apart, and a closed position, in which their second ends are in contact with each other.

Abstract: A pipeline termination arrangement to be mounted to a pipeline end section to support a pipeline hub of the pipeline end section during and after a subsea connection of the pipeline hub to a spool piece hub fixed to a spool piece termination structure is provided. The pipeline termination arrangement includes a landing structure for supporting the spool piece termination structure; a connection porch fixed to the landing structure; and a support structure which is fixed to the pipeline end section and provided with a guide frame. The guide frame slidably supports the landing structure so as to allow the landing structure and the connection porch to slide along the guide frame from a first position, in which the connection porch is located in front of and at a distance from the pipeline hub, to a second position, in which the connection porch is in contact with the pipeline hub.

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: An electrical gear configured to supply electrical drive power to a machinery to be rotated at high speed, such as a subsea motor/pump or a subsea motor/compressor assembly, the electrical gear including a high input voltage AC-motor having a low pole number, the AC-motor drivingly connected to a medium output voltage AC-generator having inverted design, wherein in the AC-generator the field windings are supported on a rotor which is journalled for rotation inside an outer stator carrying a high number of magnet poles, the AC-motor is configured to run on high voltage alternating current at a first frequency, and the AC-generator is configured to deliver medium voltage alternating current at a second frequency, higher than said first frequency, to an AC-motor to be energized having a low pole number.

Abstract: A 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 tubular joint has 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 the primary seal and radially inwardly of the 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 the outlet opening.