The vent cap system for a suction pile includes a top plate, a center stem assembly, a bottom plate, a flange assembly, and perimeter stem assemblies. The bottom plate moves between an opened position and a closed position. The center stem assembly is in direct threaded engagement with the top plate, and the perimeter stem assemblies and stem retainer cooperate to maintain alignment of the bottom plate. A pipe plug to test the sealing engagement is placed on the bottom plate, instead of the flange assembly. There is a closing lip of the bottom plate so that a sealing diameter can be the smallest diameter of the flange assembly, which reduces force on the bottom plate from under the bottom plate. There is a connection portion of the flange assembly to attach the system to the suction pile so that weld deformation does not affect the entire flange assembly.

The vent cap system for a suction pile includes a top plate, a center stem assembly, a bottom plate, a flange assembly, and perimeter stem assemblies. The bottom plate moves between an opened position and a closed position. The center stem assembly is in direct threaded engagement with the top plate, and the perimeter stem assemblies and stem retainer cooperate to maintain alignment of the bottom plate. A pipe plug to test the sealing engagement is placed on the bottom plate, instead of the flange assembly. There is a closing lip of the bottom plate so that a sealing diameter can be the smallest diameter of the flange assembly, which reduces force on the bottom plate from under the bottom plate. There is a connection portion of the flange assembly to attach the system to the suction pile so that weld deformation does not affect the entire flange assembly.

An embeddable seepage module capable of being embedded into an interface ring shear apparatus is disclosed, wherein: the seepage module includes an annular cylinder, a seepage pressure regulation system, a top plate and a bottom plate; the interface ring shear apparatus includes an upper shear box and a lower shear box; the annular cylinder, the top plate, the bottom plate, the upper shear box and the lower shear box form an internal pressure cavity and an external pressure cavity; the internal pressure cavity is able to realize the precise double control of the soil seepage pressure and water flow through the seepage pressure regulation system; the external pressure cavity is able to collect fine soil particles under pressure seepage. In the case of soil seepage-shear coupling, the seepage module is assembled firstly for seepage, and after completing the seepage, the external pressure cavity is removed for ring shear tests.

An embeddable seepage module capable of being embedded into an interface ring shear apparatus is disclosed, wherein: the seepage module includes an annular cylinder, a seepage pressure regulation system, a top plate and a bottom plate; the interface ring shear apparatus includes an upper shear box and a lower shear box; the annular cylinder, the top plate, the bottom plate, the upper shear box and the lower shear box form an internal pressure cavity and an external pressure cavity; the internal pressure cavity is able to realize the precise double control of the soil seepage pressure and water flow through the seepage pressure regulation system; the external pressure cavity is able to collect fine soil particles under pressure seepage. In the case of soil seepage-shear coupling, the seepage module is assembled firstly for seepage, and after completing the seepage, the external pressure cavity is removed for ring shear tests.

A drilling conductor supported within a suction anchor is installed by lowering the suction anchor through the top of a frame of a subsea processing unit. The base of the frame defines a landing area for the suction anchor and supports a fixing system for fixing the suction anchor to the frame. When the suction anchor has been embedded into the seabed beneath the processing unit, the frame is fixed to the suction anchor to form a structural unit that includes the conductor, the suction anchor and the frame. Additional equipment such as a blow-out presenter or a Christmas tree is lowered through the top of the frame and onto the conductor that is supported by the embedded suction anchor.

A subsea assembly including; a foundation, a support device; and a subsea equipment adapter frame is provided. The foundation, support device and subsea equipment adapter frame are separate modular components that can be installed separately. The foundation may be a suction anchor. A method of installing and uninstalling the subsea assembly is also provided.

A subsea assembly including; a foundation, a support device; and a subsea equipment adapter frame is provided. The foundation, support device and subsea equipment adapter frame are separate modular components that can be installed separately. The foundation may be a suction anchor. A method of installing and uninstalling the subsea assembly is also provided.

The present techniques are directed to systems and a method for reducing trenching around piles. An exemplary method includes attaching a mooring line to one end of a padeye extender bar that is coupled by another end to a padeye on the pile. The pile is installed in a sediment layer. The padeye extender bar is deployed to hold an attachment point for the mooring line above the sedimenlt layer.

The present techniques are directed to systems and a method for reducing trenching around piles. An exemplary method includes attaching a mooring line to one end of a padeye extender bar that is coupled by another end to a padeye on the pile. The pile is installed in a sediment layer. The padeye extender bar is deployed to hold an attachment point for the mooring line above the sedimenlt layer.

A multiline ring anchor and a method for installing the multiline ring anchor is disclosed herein. The multiline ring anchor can be used for mooring systems for including, but limited to, arrays of offshore floating offshore wind turbines, wave power, and floating barriers.