A subsea installation. The subsea installation comprises a tank containing an insulation fluid or other fluid, a heat generating electric apparatus positioned at least partly within the tanks, and a pressure compensator being in fluid communication with the tank and being configured to compensate volume variations of the insulation fluid or the other fluid by performing an expansive and a contracting movement. The subsea installation comprises further means for heating the insulation fluid or the other fluid, said means for heating being configured to provide heating to the insulation fluid or the other fluid with the heat generating electric apparatus is in a non-operating state in order to reduce the volume variations of the insulation fluid or the other fluid.

An electrohydraulic system for use at great water depths includes a vessel, a hydrostatic machine, and an electric machine. The vessel has an interior space configured to form a volume that is closed off with respect to the surroundings and that accommodates a hydraulic pressure fluid. The vessel includes a compensation piston configured to subject the hydraulic pressure fluid in the interior space to at least approximately the pressure prevailing in the surroundings. The hydrostatic machine is configured to be operated as a pump. The electric machine is mechanically coupled to the hydrostatic machine and operates as an electric motor in order to operate the hydrostatic machine as a pump. The hydrostatic machine and the electric machine are arranged in the interior space of the vessel. The compact electrohydraulic system fits on existing installations and on new installations. The electrohydraulic system also includes a compact process valve.

For protecting a tubular or a component attached to the tubular, two sections of the expandable tubular are formed into two complete centralizing rings or two partial centralizing rings having a larger outer diameter than the remainder of the expandable tubular. A sleeve is placed over a box thread of the tubular or over the component. An adhesive fully covers the space between the inside diameter of the sleeve and the outside diameter of the box thread or component. The sleeve remains in place when the tubular is placed down hole.

The publication relates to a depth compensated actuator, for a transportable inline depth compensated heave com-pensator for subsea lifting operations. The actuator comprises a cylinder shaped body and a piston with a piston rod, the piston rod being intended for exposure to external water pressure, a first and second connection means associated with the actuator. Further, the actuator comprises a depth compensator comprising a cylinder, a piston and a piston rod, the end of which being exposed to surrounding water; and conduit means between at least one volume in the actuator and one volume in the depth compensator. The pistons and piston rods are shaped as any of: hollow piston rod, ring shaped piston, ring piston rod. The depth compensated actuator solves the problem if improving depth compensation performance regarding size, weight, required fluid consumption, internal/inherent friction and adaptability. Further, use of a depth compensated actuator is claimed.

A sealing assembly includes an elastomer seal having an inner surface and a polymer cap bonded to the inner surface of the elastomer seal and having a dynamic sealing surface. The polymer cap is configured to form a continuous fluid-tight seal against a curved element when pressurized.

A hydraulic circuit includes a prime mover that is configured to generate an oscillating flow of hydraulic fluid, and an actuator that is driven by the prime mover and configured to provide oscillating motion and to be connected to a load in each direction of the motion. The hydraulic circuit also includes a reclamation device that is disposed in the hydraulic circuit between the prime mover and the actuator. The reclamation device captures and stores a portion of hydraulic fluid displaced from the actuator during a transition between opposed motions, where the portion of hydraulic fluid corresponds to an amount of hydraulic fluid equal to a volume of fluid required to compensate for compression of fluid within the hydraulic circuit due to system pressure and load pressure. The stored fluid is used by the circuit in a subsequent motion.

A milking robot for the fully automatic milking of dairy animals includes at least one moving component and a cylinder configured to support a movement of the component. The cylinder has a cylinder wall having an aeration opening, as well as a cylinder rod slidable into and out of the cylinder. The cylinder wall surrounds at least one variable volume part, which volume part is free from pressure fluid connections for displacement of the cylinder rod. The cylinder is configured to remain, via the opening, substantially in pressure equilibrium with an environment of the cylinder. To the cylinder wall around the aeration opening is connected a gas collecting device which has a changeable volume and which, together with the variable volume part, forms an airtight gas volume. In addition, the gas collecting device has a minimum volume greater than zero.

A subsea arrangement including a main enclosure having a main enclosure volume; at least one main pressure compensator having a variable compensation volume in fluid communication with the main enclosure volume and configured to compensate volume variations of an internal fluid in the main enclosure volume; and at least one pressure sensor arranged to measure a pressure of the internal fluid. A method for detecting a malfunction of a subsea arrangement including a main enclosure having a main enclosure volume and at least one main pressure compensator is also provided.

Example implementations relate to a pressure regulator assembly for a closed fluid loop of a CDU. The pressure regulator assembly has a cylinder having an internal volume, and first and second hollow pistons slidably connected to the cylinder to split the internal volume into a first volume portion having cooling fluid, a second volume portion having driver fluid, and a third volume portion having compressible matter. The first volume portion is fluidically connected to the closed fluid loop. The first hollow piston is reciprocated by the compressible matter to maintain operating pressure of the cooling fluid in the closed fluid loop. The second hollow piston is driven by the driver fluid in response to predefined pressure drop of the cooling fluid during predefined time period, to inject additional cooling fluid from the first volume portion into the closed fluid loop to restore pressure level of cooling fluid to operating pressure.

Embodiments of the present disclosure describe both mechanically-operated and electrically-operated, locally-actuated partial stroke testing devices and systems for testing operation of an emergency isolation valve.