Ships equipped with pressurized cargo tanks supported on continuous shells
A novel Spanish-developed tank support for single-barrier LNG cargo tanks uniformly distributes the tank loads, transmitted by the support, to the ship's structure without stress concentration. In this design, a continuous, suitably stiffened skirt is attached by its bottom edge to the top of the double bottom of a ship and beneath the shell or shells which constitute the support for each cargo tank. The top edge of the skirt, which has the same circumference as the bottom edge of the internal shell forming the cargo-tank support and is also opposite it, is attached to a suitably stiffened platform, preferably horizontal, which extends between the top edge and inner shell of the ship's hull. Between the skirt and platform are a number of flat plates perpendicular to the base plane of the ship and located opposite the double-bottom floors and longitudinal girders. These flat plates are welded at their top and inside edges to the platform and skirt, respectively, and at their bottom edge at the top of the double bottom; at the external edges, those plates opposite the double-bottom floors are welded to the inner shell of the ship's hull. The plates opposite the double-bottom longitudinal girders are welded to the skirt of the adjacent tank or to the terminal transverse bulkheads of the cargo-tank zone. With this arrangement, the vertical forces are transmitted from the tank support to the skirt as normal forces and to the flat plates as shear forces along the whole length of the weld seams.The horizontal dynamic forces are transmitted from the tank support to the ship's structure principally as shear forces which are distributed over the whole of the horizontal platform.
- Assignee:
- Sener, Tecnia Industrial y Naval
- Patent Number(s):
- US 3899988
- OSTI ID:
- 6569419
- Country of Publication:
- United States
- Language:
- English
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032000* -- Natural Gas-- Transport
Handling
& Storage
CONSTRUCTION
CONTAINERS
ENERGY SOURCES
FABRICATION
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
JOINING
LIQUEFIED NATURAL GAS
MARITIME TRANSPORT
MECHANICAL STRUCTURES
NATURAL GAS
PLATES
PRESSURIZING
SHEAR
SHIPS
STRESSES
SUPPORTS
TANKER SHIPS
TANKS
TRANSPORT
WELDING