Abstract: A pipe-clamping mattress has a first pipe-clamping block and a second pipe-clamping block. The first and second pipe-clamping blocks have a recessed surface, which together form a cavity for receiving a subsea pipeline. A bottom surface adjacent the recessed surface of each of the first and second blocks is adapted to rest on a seafloor when the recessed surfaces of the first and second blocks are placed around the subsea pipeline.

Abstract: A pipe-clamping block (100) comprising a top surface (110), a first outside surface (120), a second outside surface (130), a bottom surface (140), a first inside surface (150), a second inside surface (160), and a recessed surface (170).

Abstract: Unanchored fluid storage tanks rely primarily on the weight of fluid resting on an uplifted portion of the base plate to balance seismically induced overturning moments. Local uplift is therefore necessary to develop the resisting moment. This has often resulted in buckling and other damage. These problems are reduced or eliminated by inserting a ring filler under the tank wall, so that the base plate is partly preuplifted. The weight of fluid resting on the preuplifted portion of the base plate can contribute to the resisting moment without any additional uplift of the tank wall. It is shown by static analysis and by experiment that preuplift significantly improves the lateral load capacity of unanchored tanks.