Abstract: A subsea actuation system with a, at least partly, retrievable position indicator is disclosed. The subsea actuation system being connectable to a subsea structure with a valve with a rising valve stem, the rising valve stem comprising a rotation-to-linear mechanism for operating the valve, the subsea actuation system comprising an interface for receiving rotational input from a separate retrievable actuator. The interface comprises a cylindrical bucket comprising an opening in an axial direction of the cylindrical bucket, and a shaft for receiving the rotational input from the retrievable actuator, the shaft being connected to the rotation-to-linear mechanism. The position indicator is configured for indicating an amount of rotational movement of the shaft and hence a position of the valve, and at least a part of the position indicator is configured to be positionable at, and retrievable from, the interface.

Abstract: A subsea control module for controlling one or more subsea devices is disclosed and comprises a housing having top and bottom sides. The housing comprises: a first connection interface with one or more connectors for connection to one or more supply lines outside the housing; a second connection interface with one or more connectors for connection to a respective subsea device outside the housing; at least one backup connector in a third connection interface for connection to a respective subsea device outside the housing; and one or more controllers inside the housing for controlling the respective subsea device outside the housing. The one or more controllers are connectable to the respective subsea device via at least one of: the connectors in the second connection interface; the backup connector in the third connection interface.

Abstract: A locking nut for locking a subsea unit relative to a guide rod fixed to a subsea installation is described. The locking nut has a body with a bore. The body comprises first and second parts that are detachable from one another. An assembly incorporating the locking nut is also described.

Abstract: A locking nut for locking a subsea unit relative to a guide rod fixed to a subsea installation is described. The nut comprises a body having a bore; and a locking element with a threaded portion. The body has first and second ends. The body includes a tapered contact surface which tapers outwardly from the first end towards the second end. An assembly incorporating the locking nut is also described.

Abstract: A subsea actuation system with a, at least partly, retrievable position indicator is disclosed. The subsea actuation system being connectable to a subsea structure with a valve with a rising valve stem, the rising valve stem comprising a rotation-to-linear mechanism for operating the valve, the subsea actuation system comprising an interface for receiving rotational input from a separate retrievable actuator. The interface comprises a cylindrical bucket comprising an opening in an axial direction of the cylindrical bucket, and a shaft for receiving the rotational input from the retrievable actuator, the shaft being connected to the rotation-to-linear mechanism. The position indicator is configured for indicating an amount of rotational movement of the shaft and hence a position of the valve, and at least a part of the position indicator is configured to be positionable at, and retrievable from, the interface.

Abstract: An actuation assembly for a subsea valve is described. The actuation assembly has an actuator with a guide passage and a receptacle with a guide rod which is removably secured within the guide passage of the actuator.

Abstract: An apparatus for preventing seawater from penetrating into a compressor module during lowering to or retrieval from a compression plant on the seabed, with optional discharge of residual production fluids, as for instance hydrocarbons, from the compressor module prior to retrieval, wherein the compressor module comprises an electric motor (1) and a compressor (2) which are respectively connected via at least one shaft (8) and are arranged in a common pressure shell (3), an inlet pipe (5) and an outlet pipe (6) to and from the compressor module which respectively are provided with an isolation valve (7, 7?).