Abstract: A power tong (1) device, in which the power tong (1) includes two housing halves (2), pivotable relative to each other, the housing halves (2) being arranged to be pivoted between a closed, active position and an open, inactive position, and in which a radially divided drive ring (6, 8), which is provided with hydraulically activated clamping dies (14) directed towards the centre axis (10) of the power tong (1), is placed in the housing halves, the drive ring (6, 8) being supported and connected to a driving motor (12) for the rotation of the drive ring (6, 8) about said axis (10), the drive ring (6, 8) being provided with at least one locking means (16) which is arranged to interconnect the parts of the drive ring (6, 8) in a releasable manner.

Abstract: A device for cleaning and doping (lubrication) equipment for threads (3b, 4b) of the type used to join pipes (4) to a pipe string (3), especially in connection with petroleum production, where cleaning fluid and dope (lubricant) are sprayed at the threads (3b, 4b) at relatively high pressure from at least one nozzle (5, 6) mounted in the rotatable make-up section (1) of a power tong, and where at least one injection pump (7, 8) arranged to supply cleaning fluid or dope to the at least one nozzle (5, 6) is located in the rotatable make-up section (1).

Abstract: A method for loading and unloading of a solid substance having a high degree of water content from a cargo hold of a bulk carrier is disclosed. The degree of water content of the solid substance is such that a layer of liquid is formed above the solid substance. In accordance with the method, a predetermined volumetric ratio of solid substance and water is pumped out of the cargo hold by a pump that is seated on a float freely movable on the layer of liquid, at the same time as water is fed into the cargo hold at a volumetric rate substantially the same as the volumetric rate of water being pumped out.

Abstract: A method for loading and unloading of a solid substance having a high degree of water content from a cargo hold of a bulk carrier is disclosed. The degree of water content of the solid substance is such that a layer of liquid is formed above the solid substance. In accordance with the method, a predetermined volumetric ratio of solid substance and water is pumped out of the cargo hold by a pump that is seated on a float freely movable on the layer of liquid, at the same time as water is fed into the cargo hold at a volumetric rate substantially the same as the volumetric rate of water being pumped out.

Abstract: A motion absorbing conveyance system (1) for transferring personnel and/or objects between a floating vessel (2) and an installation (20), for example, an oil platform, where the vessel (2) and the installation (20) exhibit a relative movement, which system (1) comprises a boom (7), provided with an articulated connection to the vessel (2), a variable length gangway (6), having an articulated connection to the vessel (2), and a frame (8) joining together the ends of the boom (7, 31) and the gangway (6, 33) opposite to the articulated connection. On the installation (29) there is provided a ball seat (19). At the outer end of the gangway (6) is provided a ball (18), which is adapt to engage with the ball seat (19) on the installation (20), such that the ball/seat connection is capable of accommodating triaxial relative movement between the vessel (2) and the installation (20).

Abstract: A method for loading and unloading of solid substance (6) having high degree of water content of a bulk carrier (5) is disclosed. The bulk carrier (5) has one or more cargo holds (2) receiving the solid substance (6) and the solid substance (6) having such high degree of water content that a layer of liquid (7) is formed above the solid substance (6). The solid substance (6) is being discharged from each cargo hold (2) by means of a suitable pump (15) which is placed on a float (1) being freely moveable on the layer of liquid (7) in the cargo hold (2). The solid substance (6) and water are pumped out of the cargo hold (2) by a predetermined volumetric ratio and water is being fed into the cargo hold (2) by a volumetric rate which substantially correspond with the water rate that is being discharged.

Abstract: A mounting apparatus for a piston-cylinder arrangement (10,11) in a derrick (1) placed on a drill floor (2), which hydraulic piston-cylinder arrangement (10,11) is adapted to raise and lower a yoke (8) which travels on guide rails (7) in the derrick (1) itself, where the cylinder (20) is firmly held by a mounting apparatus (31) in relation to the drill floor (2). For the changing of gaskets (27) on the piston (21) and the cylinder (20), the cylinder is arranged so as to be lowerable in relation to the mounting thereof. The mounting apparatus (31) is designed to be releasable and comprises a flange (32) permanently mounted on the cylinder (20), a fixing device (37) in fixed position in relation to drill floor (2), a dividable locking ring (34), and a locking device (32) and the fixing device (37) and being firmly held in engagement with the aid of the locking device (38). A method of changing gaskets on a piston and cylinder is also described.

Abstract: A slide joint for a riser between a well and a floating petroleum installation such as an oil platform includes an outer pipe and an inner pipe which are adapted to move telescopically relative to one another to compensate for changes in the distance between the sea bed and the platform. The inner pipe is connected to a piston, which piston is responsive to actuation by hydraulic pressure in order to provide tractive force on the riser. The outer diameter of the inner pipe is adapted to the diameter of the outer pipe so as to form an annulus between the pipes. The piston is fixedly connected to the inner pipe at or near the downward oriented end thereof, said annulus above the piston being subjected to hydraulic pressure. Below the piston is provided a protective sleeve, which is slidably disposed within the outer pipe.

Abstract: An apparatus for a derrick, comprising two or more hydraulic piston-cylinder arrangements (10, 11) for raising and lowering a yoke (8) which travels on guide rails (7) in the derrick (1) itself, where two or more wire lines (13) are strung over sheaves (12) rotatably attached to the yoke. The wire lines (13) are attached at one end thereof to the top drive (9) and at the other end thereof are secured to an attachment point (14a, 14b) adjacent to a drill floor (2), said two or more wire lines being run in two sets (13a, 13b) of lines. The attachment points (14a, 14b) for each wire set are connected to a tension equalizer assembly to equalize differences in tension in the wire lines.

Abstract: Disclosed is an apparatus for a derrick, including hydraulic piston/cylinder arrangements for raising and lowering a yoke travelling on guide rails attached to the derrick. A hydraulic system having different modes of operation is provided for the operation of the piston/cylinder arrangements. The hydraulic system can operate in a normal mode for raising or lowering the yoke and in other modes by interconnecting upper and lower chambers of the piston/cylinder arrangements and utilizing a differential surface area of the piston exposed to the two chambers for rapidly raising or lowering the yoke.

Abstract: A hydraulically-operated hoist is disclosed. The hoist includes a plurality of hydraulic piston/cylinder arrangements, each having an upper end. Two guide rails are disposed in parallel with the hydraulic piston/cylinder arrangements. A self-aligning yoke is connected between the upper ends of the hydraulic piston/cylinder arrangements and is raised and lowered along the two guide rails by the hydraulic piston/cylinder arrangements. The yoke comprises a beam with the two ends. An arm is connected to each end of the beam, extends obliquely upward from the beam, and terminates in a remote end rotatably connected to the upper ends of the hydraulic piston/cylinder arrangements. At least two sheaves are rotatably connected to the beam, each of which are capable of running its own wire line.

Abstract: A torque wrench comprises a split casing which can be divided to receive and grip pipes, each casing half comprising jaws which are synchronously movable to center and frictionally engage the pipe joints. The wrench has a split inner annulus which is mounted in and connected to a split intermediate annulus which is rotatably mounted in the split casing. The inner annulus is provided with at least two activable and displaceable clamping jaws in use, temporary and external transfer of a controlled torque is provided to the intermediate annulus. The torque is, in turn, transferred to the inner annulus by the aid of a connection, preferably in the form of pump cylinders, which at the same time activate and provide the displaceable clamping jaws with the necessary power. With a spinning motor, the wrench forms a combined spinning and torque wrench. With a back-up wrench, and mounted on a carriage the wrench assembly forms a complete roughneck.