CN110375191B

CN110375191B - Sleeving method for double cylinders of horizontal low-temperature storage tank

Info

Publication number: CN110375191B
Application number: CN201910443934.5A
Authority: CN
Inventors: 崔闻天; 武常生; 于淼; 杨帅; 牛学忠; 潘刘良
Original assignee: Xinxing Energy Equipment Co Ltd
Current assignee: Xinxing Energy Equipment Co Ltd
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2021-05-28
Anticipated expiration: 2039-05-27
Also published as: CN110375191A

Abstract

The invention discloses a sleeving method of double cylinders of a horizontal low-temperature storage tank, which comprises the following steps: 1) one end of the inner cylinder is placed on a trolley I at the inlet of the outer cylinder; 2) the steel wire rope II lifts the other end of the inner cylinder; 3) pulling the trolley or pushing the inner cylinder body to be sleeved in the inner cylinder body to enter the outer cylinder body; 4) when the steel wire rope II is close to the inlet of the outer cylinder, moving up the steel wire rope II and putting the steel wire rope II into the trolley II; 5) continuously sleeving the inner cylinder body to a position needing to be positioned; 6) an insulating support is plugged into the mounting hole in the lower part of the outer cylinder, and a jack is mounted in the axial direction of the insulating support; 7) operating the jack, lifting the inner cylinder body, and taking out the two trolleys; 8) and (4) filling the rest mounting holes with the insulating supports, adjusting the positions of all the insulating supports according to design requirements, and welding and fixing. The double-cylinder sleeving method does not adopt a special tool, avoids welding on the inner cylinder, and ensures the corrosion resistance of the stainless steel of the inner cylinder.

Description

Sleeving method for double cylinders of horizontal low-temperature storage tank

Technical Field

The invention is applied to the field of production of low-temperature storage tanks, and particularly relates to a sleeving method of an inner cylinder and an outer cylinder of a horizontal low-temperature storage tank.

Background

The low-temperature storage tank for storing and transporting the liquefied natural gas LNG is of a double-cylinder structure, an inner cylinder body is made of stainless steel, the outer wall of the inner cylinder body is coated with a heat insulation material, and an outer cylinder body is made of low-carbon alloy steel. The coated inner cylinder body is sleeved inside the outer cylinder body, and the middle interlayer is vacuumized to ensure the heat insulation between the inner cylinder body and the outer cylinder body.

The applicant has applied for a plurality of patents in the aspect of nesting of the inner cylinder and the outer cylinder, and the publications are as follows: CN207065071U, CN107649848A, CN107477353B and CN207065071U, which have the advantages of improving the production efficiency and being suitable for mass production, and have the disadvantage of requiring welding reinforcing plates at two ends or one end of the inner cylinder body for connecting the flanges. The hot working of the stainless steel of the inner cylinder body is easy to cause the change of the structure and influence the performance, so the welding workload on the stainless steel inner cylinder body is reduced as much as possible for the production of single pieces.

Disclosure of Invention

The technical problem solved by the invention is as follows: the simple sleeving method is provided, and the inner cylinder is prevented from being welded without adopting special tooling sleeving.

The technical scheme adopted by the invention is as follows: the sleeving method comprises the following steps of: 1) the outer barrel is horizontally placed on the supporting wheel frame, the inner barrel is horizontally lifted by a first crown block through a steel wire rope I, one end of the inner barrel is sent into the inlet of the outer barrel, and the inner barrel is placed on a trolley I at the inlet of the outer barrel; 2) hoisting the other end of the inner cylinder by using a second crown block through a steel wire rope II, loosening the steel wire rope I and releasing the first crown block; 3) pulling the trolley or pushing the inner cylinder, and simultaneously moving the second crown block towards the sheathing direction, so that the inner cylinder is sheathed into the outer cylinder; 4) when the steel wire rope II is close to the inlet of the outer barrel, moving up the steel wire rope II, putting the trolley II from the inlet, moving down the steel wire rope II, and putting the inner barrel on the trolley II, wherein the inner barrel is supported by the trolley I and the trolley II; 5) continuously sleeving the inner cylinder to a position to be positioned, and fixing the trolley I or the trolley II to prevent the inner cylinder from moving; 6) an insulating support is plugged into the mounting hole in the lower part of the outer cylinder, and a jack is mounted in the axial direction of the insulating support; 7) operating the jack, lifting the inner cylinder body, and taking out the two trolleys; 8) and (4) filling the rest mounting holes with the insulating supports, adjusting the positions of all the insulating supports according to design requirements, and welding and fixing.

The invention has the beneficial effects that: the double-cylinder sleeving method does not adopt a special tool, avoids welding on the inner cylinder, and ensures the corrosion resistance of the stainless steel of the inner cylinder.

Drawings

FIG. 1 is a schematic view of the start of the registration;

FIG. 2 is a schematic view of the end of the registration;

FIG. 3 is a schematic cross-sectional view of FIG. 2;

wherein: 1-outer cylinder, 2-inner cylinder, 3-steel wire I, 4-steel wire II, 5-trolley I, 6-trolley II, 7-insulating support.

Detailed Description

The natural gas LNG horizontal low-temperature storage tank is of a double-cylinder structure with an inner cylinder body and an outer cylinder body sleeved, the inner cylinder body is supported by insulating supports, the number of the inner cylinder bodies is not less than three on each circumference, and the four insulating supports are generally adopted in one circumferential direction to stably support the inner cylinder bodies. The circular seam of the outer cylinder body of the low-temperature storage tank adopts automatic welding double-sided welding, and the inner cylinder body is sleeved in the outer cylinder body after the inner cylinder body is manufactured.

FIG. 1 is a schematic diagram of the start of the sleeving, an outer barrel 1 is placed on a wheel carrier, a first crown block is used for horizontally hoisting an inner barrel 2 through a steel wire rope I3, one end of the inner barrel 2 is sent into the outer barrel 1 and placed on a trolley I5 at the inlet of the outer barrel 1, and the supporting surface of the trolley is in the shape of a circular arc matched with the outer surface of the inner barrel 2, as shown in FIG. 3. And hoisting the other end of the inner cylinder body 2 by using a second crown block through a steel wire rope II 4, loosening the steel wire rope I3 and liberating the first crown block. Barrel 2 in pulling dolly I5 or promoting simultaneously the second platform overhead traveling crane moves to the direction of registrate, realizes that interior barrel 2 gets into the registrate in the outer barrel 1. When the steel wire rope II 4 is to be attached to the inlet of the outer barrel 1, the second crown block moves up the steel wire rope II 4, the distance between the inner barrel 2 and the inner lower edge of the outer barrel 1 is increased, the trolley II 6 is placed into the steel wire rope II 4, then the steel wire rope II 4 is slowly moved down, the end of the inner barrel 2 is placed on the trolley II 6, and the inner barrel 2 is supported by the trolley I5 and the trolley II 6 at the moment. And continuously sleeving the inner cylinder body 2 to a position needing to be positioned, and fixing the trolley I5 or the trolley II 6 to prevent the inner cylinder body 2 from moving, so that the sleeving is completed. As shown in fig. 2.

An insulating support 7 is inserted into an insulating support 7 mounting hole at the lower part of the outer cylinder 1, and a jack is mounted in the axial direction of the insulating support 7 as shown in figure 3. And operating the jack to move the insulating support 7 to the designed position, separating the two trolleys from the inner cylinder body 2 at the moment, and taking out the two trolleys. And plugging the insulating supports 7 at other positions into the mounting holes, and checking whether the positions meet the requirements. And after the positions of all the insulating supports 7 are adjusted, welding and fixing.

The double-cylinder sleeving method does not adopt a special tool, uses tools such as a supporting wheel frame, a crown block, a jack and the like which are necessary in a production workshop, has low sleeving efficiency, avoids welding on the inner cylinder, and ensures the corrosion resistance of the stainless steel of the inner cylinder.

Claims

1. A horizontal low-temperature storage tank double-cylinder body sleeving method is characterized in that: the inner cylinder body is not welded, and the sleeving steps are as follows:

1) the outer cylinder (1) is horizontally placed on a supporting wheel frame, the inner cylinder (2) is horizontally lifted by a first crown block through a steel wire rope I (3), one end of the inner cylinder (2) is sent into an inlet of the outer cylinder (1), and the outer cylinder is placed on a trolley I (5) at the inlet of the outer cylinder (1);

2) hoisting the other end of the inner cylinder (2) by using a second crown block through a steel wire rope II (4), loosening the steel wire rope I (3) and releasing the first crown block;

3) pulling the trolley (5) or pushing the inner cylinder (2), and simultaneously moving the second crown block towards the sheathing direction, so that the sheathing inner cylinder (2) enters the outer cylinder (1);

4) when the steel wire rope II (4) is close to the inlet of the outer barrel (1), moving up the steel wire rope II (4), putting the trolley II (6) from the inlet, moving down the steel wire rope II (4), and putting the inner barrel (2) on the trolley II (6);

5) continuously sleeving the inner cylinder body (2) to a position needing to be positioned, and fixing the trolley I (5) or the trolley II (6);

6) an insulating support (7) is plugged into a mounting hole at the lower part of the outer cylinder body (1), and a jack is mounted in the axial direction of the insulating support (7);

7) operating the jack, lifting the inner cylinder (2), and taking out the two trolleys;

8) and (5) filling the rest mounting holes with the insulating supports (7), adjusting the positions of all the insulating supports (7) according to design requirements, and welding and fixing.