Other

Norwegian Contractors A/s

Norwegian Contractors

Abb Anchor Contracting As

Seatower As

Karel Karal

Jan Skjong

Johan Lassen-Urdahl

Sigurd Ramslie

J&oslash;rgen H&oslash;gmoe

A tendon which is divided into compartments enclosing therein pressurized gas. A method for transporting a fluid containing tubular body or assembly of bodies above a sea/river bed floor and within a body of water. In addition to the method for transporting the tendon a method of installing and removing an internal pressurized tendon or assembly of tendons in a vertical position in a body of water.

Tension leg and method for transport, installation and removal of tension legs pipelines and slender bodies

A suction anchor for mooring systems, especially from floating installations for offshore production of oil and gas. The anchor is made in the form of a hollow cylindrical body (2) that is open at both ends and is completely embedded in the seabed (1), i.e. it is surrounded by seabed mass on all sides. Such a deep siting of the anchor (2) results in several advantages. For instance, the anchor (2) will penetrate to a depth with presumably firmer masses. The danger of a split on the back of the anchor is also avoided. The anchor can be left behind after use, because it lies at an approved depth. The anchor is mounted by means of a top piece designed as an inverted beaker-shaped part provided with a vent hole so that the anchor can be suction penetrated. The top piece is recovered and used again for lowering other similar anchors. Advantageous embodiments/sitings of the anchor cable (5,7) connected to the anchor are also described.

Subsea mooring

A method and apparatus for installation of heavy, ballastable, gravity fundament structures on the sea bottom at large depths. In accordance with the invention, there is utilized air, water, and a liquid lighter than water in various proportions and combinations to provide the structure with the required buoyancy and submerged weight during the sequential phases of the transport and descent operations in order to finally position the structure in a selected location on the sea bottom. Various modes can be used to accomplish the descent and the structure may in a final stage be penetrated down into the sea bottom to a sufficient degree.

Method and apparatus for submersion and installation of fundament

The immersion and positioning of a sink element on the sea bottom is controlled by providing a weight system suspended from the sink element. An auxiliary surface vessel has a control cable directly connecting the vessel with the weights system suspended from the sink element. The sink element is immersed with the weight system suspended therefrom and therebelow until the weight system contacts the sea bottom and the sink element reaches a preselected stabilized equilibrium elevational position above the sea bottom. Then the sink element can be laterally displaced while substantially maintaining the height of the sink element above the sea bottom by having the auxiliary surface vessel pull on the control cable connected to the weight system in a direction of movement towards the final location site. The weight system contacts the sea bottom during this movement to help control the movement of the sink element and minimize the influence of outside forces. When the sink element has substantially arrived at the final location site, the sink element is ballasted so that it will sink onto the site on the sea bottom. Buoyant floating bodies may be used for floatation and sinking of the sink element as well as mounting of the weight system.

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Oslo, Norway

Karel Karal