Abstract:
A fluid swivel is described, which is especially useful for carrying hydrocarbons at high pressures between stationary and rotating walls of a swivel. The swivel forms a fluid-carrying annular chamber and a pair of gap-like passages lying between the walls and extending from opposite sides of the chamber to the environment, with primary and secondary face seals located along each passage. Each passage includes a portion extending between the seals, the passage portion forming a pair of largely radially-extending wall surfaces, one on the outer wall and one on the inner wall. The radially-extending wall surface on the outer wall faces in a first axial direction, and the outer wall at the secondary seal faces in an opposite axial direction. As a result, if the primary seal should fail, this will not change the axial force on the outer wall. The extrusion gaps at the seals extend in radial directions from the seal, so these gaps do not widen when high pressure is applied to the fluid swivel.
Abstract:
An improved offshore terminal is described, of the type that includes a riser loosely anchored at the sea floor so its upper end can extend from a deep underwater level up to the surface to moor a tanker and transfer hydrocarbons to it. A weight hangs from the lower end of the column to improved dynamic mooring and, where the riser is disconnected to limit the sink depth of the riser. For movement to the deployed position, the riser is lifted by extending a line downwardly from a winch on the vessel, through a central hole in the connector frame down to the top of the riser, the line being pulled to raise the riser until its upper end lies within the central hole of the connector frame. A perforated upper portion of the riser then is in fluid communication with the inner portion of a fluid swivel, so that hydrocarbons can pass out of a conduit within the riser and into the swivel.
Abstract:
A method for installing risers so they extend from a FPU (floating production unit) to multiple subsea hydrocarbon wells of an oil field, which avoids damage to the pipe sections and that is economical. As pipe sections are connected to a near end (56) of a pipe string portion (68B-68D) that lies at the FPU, a tug boat (30) pulls the far end (65) of the pipe string toward a well head. Initially, a long pull line (34) extends from a winch (32) on the tug boat, in a double catenary curve to the far end of the pipe string. The winch is operated to shorten the pull line until the pipe string extends in a double catenary curve (60). Tension in the pipe string is maintained at a proper level during installation by maintaining the near end portion of the pipe string so it extends at a near end angle (70) to the vertical that continually lies within a predetermined range, such as from 3° to 12°.
Abstract:
Floating construction (1) having a base (2), a tensioning member (17, 18) extending from the sea bed in the direction of the base, a connector (27, 28) at an upper end (16,19) of the tensioning member and attachment means on the base for attaching to the connector, characterized in that, the attachment means comprise a guide member (14, 15) for lowering a tensioning member (12, 13) section by a predetermined distance (D2), which tensioning member section at a free end (23, 24) is provided with a complementary connector (25, 26) for attaching to the connector on the upper end of the tensioning member, the tensioning member section comprising at an upper end a stopper (31, 32) for engaging with the base and for fixing and/or adjusting the upper end in a vertical direction, the floating construction comprising a pulling device (36, 37, 38, 39) attached to the tensioning member section, for lowering the tensioning member section along the guide member towards the tensioning member.
Abstract:
A hydrocarbon transfer system includes a first structure with a length direction and a transverse direction having a frame carrying a vertical arm with at its end a fluid connecting member for connecting to a second structure which is moored alongside the first structure. The connecting member includes a winch and first guiding elements for engaging with second guiding elements on the second structure by connecting a wire to the winch on one end an to the second structure on the other end, and a tension device for moving the vertical arm away from the second structure for tensioning the wire.teh
Abstract:
A mooring system includes a vessel and a elongate mooring column having an upper end connected to an arm on the vessel projecting from the vessel bow and a lower end connected to the sea bed via anchor lines, characterized in that the arm is pivotable around a transverse axis.
Abstract:
Systems are described for obtaining energy, especially electrical energy, from sea waves. An elongated elastic tube device (12) floats at the sea surface (20) (or at a shallow depth under it) and extends at least partially parallel to the direction of wave propagation (D). The tube bends as a wave passes by and such tube bending stretches and relaxes SSM (synthetic stretchable material) (44, 60, 62) which generates electricity in electrodes (46, 48) when its amount of stretching changes. Electricity from power takeoffs in the tube are electronically added.
Abstract:
A flexible cryogenic transfer hose for connecting two cryogenic facilities, has a length of at least 20 m, and: an inner flexible hose with at least two segments, interconnected via at least two transverse inner connecting members, an outer hose surrounding the inner hose and including a watertight elastomeric or composite material, the outer hose having at least two segments mutually connected via two outer connecting members, the outer hose having a wall thickness of at least 2 cm, a bend radius of at least 2 m, and an internal diameter of at least 20 cm, the inner hose being kept at a distance from the outer hose via spacer elements bridging a distance between the outer wall of the inner hose and an inner wall of the outer hose, which distance is between 0.1 and 0.8 times the internal diameter dio of the inner hose.
Abstract:
A system wherein cold water from near the sea floor is pumped through a primarily vertical pipe (12) to a body (14) floating at the sea surface so energy can be obtained from water temperature differences. A pump (50) located at the bottom of the pipe, is part of a pump module (46) that can be inserted and removed horizontally through a slot (44) in a bottom structure (22) lying at the bottom of the pipe. The top of the pipe is sealed to a movable pipe connector, by a U-shaped elastomeric seal (110). The pipe can include a short top pipe section (126) and a long bottom pipe section (127) of smaller diameter (D), whose upper portion can be pulled up through the top pipe section when the top pipe section is damaged.
Abstract:
A composite hose includes a tubular body of flexible material for transferring cryogenic fluid through the hose and for preventing fluid leakage through the body. The tubular body includes an inner wire helix spirally wound along the length of the hose, an outer wire helix spirally wound along the length of the hose, at least two reinforcing layers placed in between the inner and outer wire, at least one sealing layer placed between two reinforcing layers, an end fitting at both ends of the tubular body, each end fitting provided with a part for connection to another hose flange and an elongated cylindrical part, which is divided in an anchoring area for anchoring the tubular body and a static sealing area for fluid tight sealing of the hose. A gas tight sealing is created by bonding the at least one sealing layer to the cylindrical part over a ring shaped bonding area.