Abstract: A tank for storing fluid, especially hydrocarbons including low temperature liquefied natural gas. The tank comprises tank walls defining an interior tank space, wherein at least one beam is provided in the interior tank space having at least one beam end connected to the tank wall. The at least one recess is provided in the tank wall for receiving the beam end for anchoring to the tank wall.

Abstract: A tank for storing fluid, especially hydrocarbons including low temperature liquefied natural gas. The tank comprises tank walls defining an interior tank space, wherein at least one beam is provided in the interior tank space having at least one beam end connected to the tank wall. The at least one recess is provided in the tank wall for receiving the beam end for anchoring to the tank wall.

Abstract: A prismatic tank has outer and inner walls and internal horizontal stays. The walls include a plurality of horizontal beam sections. Each beam section has two parallel flanges interconnected by a web and a pair of opposing end faces. The beam sections are stacked one on top of the other and joined together along adjoining longitudinal edges of respective flanges and at end faces of respective beam sections such that a joint is formed between a first end face of a first beam section and a second, abutting end face of a second, abutting beam section. The web of the first beam section is recessed at the first end face and the web of the second beam section is recessed at the second end face so as to leave a first opening in the joint.

Abstract: A double containment prismatic tank has outer and inner walls (1, 2) made by stacking H-beam sections on top of each other and joining them along their longitudinal flange edges and at their abutting end faces in joints (5). In the joint areas internal stays (tension beams) (3) are connected to the inner wall (2) to improve the structural efficiency of the tank. The stays (3) are connected to the inner wall (2) by means of brackets (6) which extend in a smooth and tapering manner to the sides of the joint (5) area. In the joint (5) the outer and inner flanges (7, 8) of the beams (4) are joined by welds (10). However, the webs (9) of the beams (4) are not welded together in the joint, but are instead recessed and terminated in a smooth curve so as to form an opening (11), thus avoiding any contact between the outer and inner walls (7, 8) that are not base metal and thereby avoiding a risk of fatigue crack propagation from the inner wall (2) to the outer wall (1).

Abstract: A riser for conveying fluids from a subsea location to a surface vessel comprises an upper section which is located in a confining conduit, said upper section being allowed to deform elastically into a helical configuration against the inside of the confining conduit when subjected to axial compression. The riser further comprises a main section extending below the confining conduit to said subsea location. The riser also comprises a buoyancy arrangement which keeps the main section in tension. This arrangement allows the Christmas tree to be supported directly on the deck of the surface structure and allows the surface structure to support the weight of the tree as well as the tubing which is hung off from the tree.

Abstract: A riser for conveying fluids from a subsea location to a surface vessel comprises an upper section which is located in a confining conduit, said upper section being allowed to deform elastically into a helical configuration against the inside of the confining conduit when subjected to axial compression. The riser further comprises a main section extending below the confining conduit to said subsea location. The riser also comprises a buoyancy arrangement which keeps the main section in tension. This arrangement allows the Christmas tree to be supported directly on the deck of the surface structure and allows the surface structure to support the weight of the tree as well as the tubing which is hung off from the tree.

Abstract: Hybrid riser configuration comprising a plurality of steel riser pipes substantially inserted in aluminium guide conduits, with buoyancy means and tethering tension means, the guide conduits and riser pipes being rigidly connected to a base anchored to the ocean floor. The guide conduits serve as the tethering tension means and as radial constraint for the respective riser pipe therein to allow the riser pipe to buckle in elastic deformation (Euler) to form a spiral when expanding due to service pressure and temperature. A method for installing the riser configuration is also disclosed.