The current technology allows the TLP to be designed for water depth of 4500 ft with a topside deck payload of 20,000 tons for the Gulf of Mexico environment. There are over twenty TLPs in operation in the Gulf of Mexico, the North Sea, offshore Indonesia and West Africa. The decoupling between the riser tower and TLP in the vertical and rotational mode of the oscillation and their coupling in the sway and surge modes create friendly motion behavior between the two structures without hurting each other. The riser buoyancy is added to the tower in the design. However, the TBTLP is a fixed structure, and the natural heave of the structure is determined with the tendon axial stiffness and added mass of the hull. The axial stiffness has two components: one arising from the tether stiffness and the second from the hydrostatic state of the hull.
It makes the deck span reasonable within the fabrication limit of the shipyard and the application requirements. That makes the artificial seabed behave like the actual seabed. This invention relates generally to offshore floating structures, and, more particularly to a tension-based tension leg platform (TBTLP) for use in ultra deepwater to support dry-tree oil and gas production which utilizes a tension base or artificial seabed to simplify tendon design at deep water locations in harsh environment and a truss pontoon to reduce vertical and horizontal wave loadings.
- Dormir poco o de manera insuficiente
- F05B2250/24-Geometry three-dimensional ellipsoidal
- Los músculos centrales son los que ayudan a mantener el equilibrio cuando estamos de pie
- Cicatrices puntiformes de pulpejos
- Fisiopatología y abordaje energético de las principales enfermedades
- De salida
- Haz una breve pausa (4 o 5 segundos) y vuelve a subir en repetidas ocasiones
- Episodios de diarrea o estreñimiento
However with the help of the truss pontoon concept, the structural weight of the hull is reduced significantly compared to the use of conventional pontoons. The dynamic characteristic and the structural motion relative to waves of the present invention are significantly different from the conventional TLP concept. The SPAR is typically not recommended by engineering companies for ultra deepwater applications because of fabrication, transportation and installation complexities. The effect of water pressure at 4000 ft is not a critical issue in the structural design of the box material as the inside and outside water pressures are same. The artificial seabed is a complete finished box closed on all sides with inlet and outlet valves for the water entrances. The submerged artificial seabed is vertically moored by another independent set of lower tendons to the real seabed at 8000 ft water depth.
The TLP is moored to the seabed by high tensile strength steel tubes called tendons which allow very little vertical motion to the platform. The artificial seabed is a submerged platform made of internally stiffened box structure. The box is also used for local dry transport of the hull with or without the deck as designed accordingly. The tension base box may be buoyant when constructed with water inlet and outlet valves.