Lng cargo tank insulation system
阅读：51发布：2023-05-21
专利汇可以提供Lng cargo tank insulation system专利检索，专利查询，专利分析的服务。并且In a marine vessel having a hull structure for transporting or storing a cargo tank adapted to contain liquified and/or compressed gas, the tank is supported within the hull in any convenient manner by a support structure, with the exterior surface of the tank substantially entirely covered by a thermal insulation material. The insulation material also covers a portion of the support structure and extends from the point of juncture of the support structure with the tank towards a termination point spaced from the hull. The insulation material covering the support structure is tapered from a maximum thickness adjacent the point of juncture of the support means with the tank to a minimum thickness at the termination point so as to create a controlled temperature gradient in the support structure thereby to minimize the thermal stresses in the tank at the point of juncture thereof with the support structure.，下面是Lng cargo tank insulation system专利的具体信息内容。
1. Apparatus for storing liquified gas on a support sturcture which is at ambient temperature comprising, a spherical tank for containing said liquified gas, an annular support ring formed of the same material as said tank and being integrally and tangentially connected to the periphery of said tank adjacent an equatorial portion thereof; said ring being operatively connected to said support structure for supporting said tank on said structure whereby said annular support ring expands and contracts simultaneously with and to substantially the same extent as said tank at the point of juncture of the tank and the annular ring; and means for controlling the temperature drop and temperature gradient in said support ring between its point of juncture with said tank and the support structure to cause the deflection of said annular ring as a result of the temperature differentials at its opposite ends to occur in the central portion of the ring, thereby to minimize stress in the tank and at the point of juncture of the tank with the support ring; said means comprising thermal insulation material secured to and surrounding the exterior of said tank and a predetermined portion of said support ring, said thermal insulAtion material extending along said support ring from the point of juncture of the support ring with said tank towards said support structure and having a controlled and decreasing thickness along said ring from its point of juncture with the tank for a predetermined distance along said ring thereby to control the temperature gradient in the support ring to a predetermined pattern to permit said ring at its point of juncture with said tank to expand and contract simultaneously with the tank and to distribute the thermal stresses in and the thermal deformations of said support ring to a predetermined pattern in a central portion of the ring below its point of juncture with the tank and above said support structure, thereby to minimize the stress in the tank and at the point of juncture of the tank with the support ring.
2. Apparatus for storing liquified gas at low temperatures on a support structure which is at ambient temperature, comprising: a tank for containing the liquified gas having a generally circular horizontal cross-section with substantially hemispherical top and bottom portions, a support ring having a top portion which comprises the portion of said tank around said circular horizontal cross-section and a skirt portion which projects downwardly from said top portion substantially tangentially to said tank with said bottom hemispherical portion of the tank being spaced progressively away from said skirt portion progressively downwardly from said top portion of said ring, a support structure at the bottom of said skirt portion and providing the support for said tank, and thermal insulation means enclosing said tank and said ring, said thermal insulation being varied in thickness and shape with a thickness throughout the surface of said tank to provide satisfactory operating conditions and having a reduced thickness along said skirt portion of said ring to provide a progressive temperature drop between said top portion of said ring and said support structure and prevent an excessive temperature gradient at any zone along said skirt portion and to maintain a predetermined pattern and position of said temperature gradient between said top portion of said ring and said support structure.
3. Apparatus as defined in claim 2 wherein said thermal insulation is tapered in a relatively smooth curve from a maximum dimension at a first point located a predetermined distance from the point of juncture of said support ring and said tank to a minimum dimension at a second point located a predetermined distance from said first point.
4. Apparatus as defined in claim 2 wherein said thermal insulation is tapered in a plurality of segments of uniform width, with each successive segment having a narrower uniform width than a preceeding segment.
5. Apparatus as defined in claim 2 wherein said support structure comprises a marine vessel and said tank has a generally circular crosssection.
6. Apparatus as defined in claim 5 wherein said support ring comprises an annular skirt member extending about the periphery of said tank and being integrally secured at one end to said tank and integrally secured at its opposite end to the structural members of said marine vessel.
7. Apparatus as defined in claim 6 wherein said tank includes an integral peripheral interface structure and said one edge of said skirt is integrally secured to said structure.
8. Apparatus as defined in claim 2 wherein said tank has a radius of approximately 120 feet and said supporting means has a height of approximately 40 feet and is covered by said insulating material over a length of approximately 18 feet.
9. Apparatus as defined in claim 8 wherein said insulating material has a maximum thickness of approximately 8 inches on opposite sides of said supporting means and is tapered from said maximum thickness to zero over a length of approximately 7 feet 6 inches.
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