Double-layer spherical tank and hoisting method thereof

Abstract

The invention provides a double-layer spherical tank and a hoisting method thereof. The double-layer spherical tank comprises an outer-layer spherical tank, an inner-layer spherical tank, a plurality of pillars and a thermal insulation material layer filled between the inner-layer spherical tank and the outer-layer spherical tank, one ends of the plurality of pillars are respectively in tangent connection with a plurality of shell plates, and joints of the outer-layer spherical tank and the plurality of pillars are located on a circular seam formed between spherical shell plates of an upper belt and a lower belt of the spherical tank. The invention further provides a hoisting method for the double-layer spherical tank. The hoisting method comprises the following steps: 1) hoisting the inner-layer spherical tank connected with the plurality of pillars in place; and 2) based on the fact that joints of the outer-layer spherical tank and the plurality of pillars are located on the circular seam formed between spherical shell plates of the upper belt and the lower belt of the spherical tank, successively hoisting shell plates of the outer-layer spherical tank until the integral double-layer spherical tank is shaped through adjustment. With the hoisting method provided by the invention, installation difficulty of the double-layer spherical tank can be lowered down, integral installation quality can be improved, and an installation period can be shortened.

Description

technical field [0001] The invention relates to the field of cryogenic stainless steel double-layer spherical tanks, in particular to a double-layer spherical tank and a hoisting method thereof. Background technique [0002] Cryogenic double-layer spherical tanks are suitable for large-capacity LNG storage tanks. Compared with other vertical or horizontal storage tanks, double-layer spherical tanks have the smallest surface area under the same volume and pressure, so the required steel area is the smallest. ;In the case of the same diameter, the internal stress of the spherical tank wall is the smallest and uniform, and its bearing capacity is twice that of the cylindrical container, so the plate thickness of the spherical tank only needs to be half of the wall thickness of the corresponding cylindrical container. Tanks can greatly reduce the consumption of steel, and generally save 30% to 45% of steel. Liquefied natural gas (LNG) spherical tanks must take reliable cold ins...

AI Technical Summary

Problems solved by technology

[0005] 1. In the traditional laying method of the outer spherical tank, the pillars of the spherical tank will penetrate the equatorial spherical shell plate or the lower temperate spherical shell plate of the outer spherical tank. During field installation, the spherical shell plate of the outer tank must be opened and pre-installed before the inner tank is hoisted. Installed on the outside of the pillars of the inner spherical tank and hoisted as a whole, the hoisting is more difficult, and the outer spherical tank is generally thin, prone to deformation and collision during hoisting, affecting the overall quality of the outer tank

[0006] 2. The construction site is complicated, and the deviation of the foundation quality and elevation of the spherical tank will increase the difficulty of installing the outer spherical tank and affect the quality of the on-site installation of the outer tank

[0007] 3. The gap between the outer spherical tank and the inner tank and the overall molding quality are also difficult to control, and the on-site construction is difficult

[0008] 4. After the outer spherical shell plate is pre-installed on the pillar, it is difficult to build the scaffolding required for on-site installation, and it is not convenient for the installation and welding of the inner spherical tank

[0009] In order to solve the above problems of increased construction difficulty and unguaranteed construction quality due to the traditional typesetting method of the outer spherical tank, the present invention can not only simplify the construction process but also ensure the installation quality of the outer spherical tank

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