Abstract: A riser guide is for use on a floating offshore platform, the platform comprises a topsides and a substructure having a lower pontoon, and at least one riser extends from a subsea location to the topsides. A number of riser guides are located in a guide housing which is secured to the platform. Each riser guide comprises a support arm rotatably mounted in the guide housing. A roller for laterally guiding the riser is rotatably mounted in an end of the support arm. A vertically movable wedge which is used for lifting the guide housing is connected to the support arm. During lifting of the guide housing the wedge lifts the support arm and the roller to an inactive position. When installing the riser guides, the guide housing and the riser guides are placed around the riser at the topsides, and lowered down in place by lifting gear connected to the wedges.

Abstract: A riser guide system is for use on a floating offshore platform, the platform having a topside and a substructure having a lower pontoon, and at least one riser extends from a subsea location to the topsides. A permanent guide is secured to the pontoon, a primary guide is located in the permanent guide, a secondary guide is located in the primary guide, and riser guides are located in the secondary guide and face the riser. In a method for installing the riser guide system, both the primary guide, the secondary guide and the riser guides are placed around the riser at the topsides, and lowered down to the pontoon.

Abstract: A riser guide system is for use on a floating offshore platform, the platform comprises a topsides and a substructure having a lower pontoon, and at least one riser extends from a subsea location to the topsides. A permanent guide is secured to the pontoon, a primary guide is located in the permanent guide, a secondary guide is located in the primary guide, and riser guides are located in the secondary guide and face the riser. In a method for installing the riser guide system, both the primary guide, the secondary guide and the riser guides are placed around the riser at the topsides, and lowered down to the pontoon.

Abstract: A riser guide is for use on a floating offshore platform, the platform comprises a topsides and a substructure having a lower pontoon, and at least one riser extends from a subsea location to the topsides. A number of riser guides are located in a guide housing which is secured to the platform. Each riser guide comprises a support arm rotatably mounted in the guide housing. A roller for laterally guiding the riser is rotatably mounted in an end of the support arm. A vertically movable wedge which is used for lifting the guide housing is connected to the support arm. During lifting of the guide housing the wedge lifts the support arm and the roller to an inactive position. When installing the riser guides, the guide housing and the riser guides are placed around the riser at the topsides, and lowered down in place by lifting gear connected to the wedges.

Abstract: A hydraulic coupling comprising a first part having at least one check valve, a second part having at least one check valve, and a seal plate designed to be placed between the first and second parts. The first part, second part and seal plate are oriented in relation to one another. At least one connecting member disposed in the seal plate to establish communication between the interdependent check valves. In the extension of each check valve there is disposed a cylindrical surface, the center axis of which coincides with that of the check valves, and said connecting member is at each end formed with partial, open spherical cups for external sealing interaction with the cylindrical surfaces, the internal spherical surfaces being subjected to the same pressure as that in the medium which passes through the valves and the connecting member for the purpose of actuating the radial forces in the spherical cup. On the outside of the hydraulic coupling a tool can be used to carry out the coupling operation.