Large full containment low temperature storage tank wall lining plate precise positioning installation method

Abstract

The application discloses a large full-containing low-temperature storage tank wall lining plate precise positioning installation method, which innovatively divides the wall lining plate into upper and lower parts, optimizes the construction method, and improves the installation precision of 200,000 m3 LNG low-temperature storage tank wall lining plate by 20%; the whole hoisting of the wall lining plate with a length of more than five meters is realized through prefabrication and splicing, thereby reducing the amount of high-altitude operation, improving the installation positioning accuracy, and improving the qualified rate of the welding joint assembly welding to 99%; the wall lining plate is spliced and welded on the ground, and is scientifically transported, so that the installation quality is guaranteed; four hoisting points of the wall lining plate are arranged, the wall lining plate is hoisted by cooperation of an electric hoist and an inverted chain, and meanwhile, the wall lining plate is limited by a "7" type positioning block of an auxiliary fixture, so that the wall lining plate is kept in a natural vertical state in the hoisting process, friction between the wall lining plate and a wall is avoided, the overlap amount between the wall lining plate and a pre-embedded part can be precisely controlled, and the defect that the electric hoist cannot directly hoist and transport the wall lining plate to a position due to insufficient space of a tank top is overcome, so that normal installation of the wall lining plate is ensured, and the overall installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of storage tank construction, and particularly relates to a large full-containment low-temperature storage tank wall lining plate precise positioning and installation method. BACKGROUND

[0002] The large full-containment low-temperature storage tank is mainly used for emergency reserve, and can provide normal gas source to the city gas pipe network when upstream gas stop or other accidents occur. It can also be used as a peak shaving facility to receive LNG ship cargo and store it in the matching storage tank, and then supply the market during the use gas peak period. The full-containment storage tank is generally composed of a prestressed concrete outer tank with steel strands and a Ni9 steel inner tank, and the design temperature is-165 DEG C. The outer tank wall lining plate, as a part of the storage tank, plays an important role in the storage of natural gas. The temperature of the gas in liquid state is about-165 DEG C. In order to ensure the temperature, the storage tank is divided into four parts: the outer tank concrete, the outer tank wall lining plate, the insulation layer and the inner tank. The installation of the outer tank wall lining plate is attached to the concrete wall, which serves as the link between the insulation layer and the concrete. On the one hand, it protects the insulation material from moisture, and on the other hand, it prevents the vaporized natural gas from seeping out, ensuring the safe operation of the storage tank.

[0003] During the construction of the storage tank, the installation precision and quality of the outer tank wall lining plate directly affect the cold insulation effect of the storage tank, and then affect the operation performance. The wall lining plate is installed after the dome is completed and the gas is lifted. At present, the three-section wall lining plate installation is generally used at home and abroad. The high-altitude welding operation is large, the aerial basket usage is also large, the cross operation is much, the installation period is long and unsafe. SUMMARY

[0004] In order to solve the above problems, the present application discloses a large full-containment low-temperature storage tank wall lining plate precise positioning and installation method. The wall lining plate is innovatively divided into upper and lower parts, wherein the lower part is installed by using a movable scaffold and an electric hoist. The upper part is first welded and assembled on the ground, hoisted by using an electric hoist, adjusted in place by using a chain block, and then welded and polished by the workers riding the basket. This installation method greatly reduces the high-altitude welding operation of the LNG storage tank outer tank wall lining plate, reduces the cross operation, reduces the usage of the aerial basket, and shortens the installation period.

[0005] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0006] The large full-containment low-temperature storage tank wall lining plate precise positioning and installation method comprises the following steps:

[0007] (1) Preparing the storage tank wall lining plate, which is divided into an upper wall lining plate and a lower wall lining plate, wherein the upper wall lining plate is vertically spliced by N plates, and N>1;

[0008] (2) Preparing the corner plate;

[0009] (3) The outer wall of the outer tank is provided with two rings of circumferential embedded parts and a plurality of vertical embedded parts;

[0010] (4) The corner plate is installed first, and the corner plate is overlapped with the lower ring of circumferential embedded parts and the edge bottom plate;

[0011] (5) The lower wall lining plate is welded between the two rings of circumferential embedded parts;

[0012] (6) Hoisting the upper wall lining plate:

[0013] After the prefabrication and splicing of the upper wall lining plate are completed, four symmetrical lifting lugs are welded at one end of the wall lining plate close to the wall body. The upper two lifting lugs are used for connection with the electric hoist, and the lower two lifting lugs are used for connection with the drop chain after the lifting height of the wall lining plate reaches the lifting limit height of the electric hoist, and the wall lining plate is continuously pulled up to the designed height by means of the drop chain, and the attitude of the wall lining plate is adjusted by means of the drop chain. In order to prevent excessive collision between the upper end of the wall lining plate and the wall body during hoisting, the front two lifting lugs are connected with the hook of the electric hoist through the steel wire rope during hoisting to prevent excessive bending of the upper part. The installation position and angle of the lower two lifting lugs should be noted to cooperate with the electric hoist and the steel wire rope used for hoisting. The installation position should fully consider the maximum lifting height provided by the electric hoist and the bending deformation and friction collision with the wall body caused by the excessive length of the wall lining plate above the lifting lugs. The best position of the lower two lifting lugs should be close to the overlapping position of the wall lining plate upper end and the pressure ring after the electric hoist reaches the maximum lifting limit, so as to reduce the lifting time by the drop chain and improve the work efficiency. When installing the lower two lifting lugs, the length of the steel wire rope and the included angle formed between the two lifting lugs during lifting should be fully considered to maximize the guarantee that the stress of the installed lifting lugs is along the length direction of the weld and the direction after the steel wire rope is tensioned is kept in the same straight line. In this way, the stress state of the installed lifting lugs is the most ideal, and a stable triangular structure is formed between the lifting lugs and the steel wire rope. The two lifting lugs in the same row should be symmetrically welded along the central axis during installation, so as to maximize the guarantee that the wall lining plate maintains a natural vertical state during hoisting. After the welding of the lifting lugs is completed, 100% PT detection should be performed on all lifting lugs before hoisting operation. Warning zones should be set and special safety protection personnel should be provided for on-site safety management during operation.

[0014] After the upper wall lining reaches the designated position, the ropes connecting the two upper lifting lugs and the lower lifting lugs are removed, and hooks of the chain hoist are connected thereto. One hook of the chain hoist is installed on the lifting lug welded on the compression ring in advance, and the other hook is connected to the upper lifting lug. The length of the chain hoist is adjusted to bear the force completely. After the connection with the chain hoist is completed, the connection between the electric hoist and the lower two lifting lugs is released. The horizontal and vertical degrees of the wall lining are adjusted by the chain hoist. The bottom of the adjusted upper wall lining is placed on the positioning block welded on the upper ring-shaped embedded part and aligned with the three positioning blocks on the left vertical embedded part. After being positioned, three positioning blocks are welded on the right embedded part to limit and control the upper wall lining, so as to ensure the installation accuracy of the upper wall lining. After the position is adjusted, welding is performed.

[0015] (7) welding the upper wall lining.

[0016] As a supplement of the present application, the length of the lower wall lining in step (1) is equal to the height of the outer tank top minus the height of the upper wall lining minus the height of the corner plate.

[0017] As a supplement of the present application, the corner plate in step (2) is L-shaped, and the corner thereof is circular arc-shaped.

[0018] As a supplement of the present application, after the installation of the corner plate in step (4) is completed, the inclined support column is spot-welded and fixed to control the deformation during welding.

[0019] As a supplement of the present application, the positioning blocks are welded on the left vertical embedded part and the lower ring-shaped embedded part of the lower wall lining before welding in step (5).

[0020] As a supplement of the present application, the bottom of the upper wall lining in step (6) is placed on the positioning block of the upper ring-shaped embedded part and aligned with the three positioning blocks on the left vertical embedded part. After being positioned, three positioning blocks are welded on the right embedded part to limit and control the upper wall lining.

[0021] As a supplement of the present application, the positioning blocks in steps (5) and (6) are "7"-shaped positioning blocks.

[0022] As a supplement of the present application, the inclination angle of the two lower lifting lugs in step (6) is the same as the angle of the lifting rope.

[0023] As a supplement of the present application, the welding method adopts manual electric arc welding.

[0024] The present application has the following beneficial effects:

[0025] (1) The wall lining is divided into upper and lower parts and installed separately, which optimizes the construction method,

[0026] (2) The hoisting points of the upper wall lining plate are set as four hoisting points, hoisting is carried out by cooperation of electric hoist and drop chain, and the "7" type positioning block of auxiliary fixture is limited, and has the following effects:

[0027] a: The overlap amount between the wall lining plate and the embedded part can be accurately controlled,

[0028] b: The defect that the electric hoist cannot be directly hoisted into place due to insufficient space on the tank top is overcome, and normal installation is ensured;

[0029] c: The wall lining plate is kept in a natural vertical state during hoisting, avoiding friction between the wall lining plate and the wall.

[0030] (3) The wall lining plate is welded by splicing on the ground, and the back is paved with a circular pipe for transportation, which reduces the technical difficulty of welding construction and ensures the welding quality. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is the installation schematic diagram of the present application.

[0032] Figure 2 is the schematic diagram of the circumferential embedded part and the vertical embedded part of the inner wall of the storage tank.

[0033] Figure 3 is the installation schematic diagram of the corner plate and the inclined support column.

[0034] Figure 4 is the schematic diagram of the upper wall lining plate.

[0035] Figure 5 is the schematic diagram of the positioning block.

[0036] Figure 6 is the installation schematic diagram of the upper wall lining plate. DETAILED DESCRIPTION

[0037] The present application will be further illustrated below in combination with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present application and are not used to limit the scope of the present application.

[0038] With a LNG storage project in Jiangsu Province as an example, a 20m³ large full containment concrete LNG storage tank is required to be built, with a height of 36 meters (not including the dome height), and the wall lining plate is installed after the dome is completed by air jacking. The wall lining plate is made of 16MnDR steel plate with a thickness of 6mm, and the outer wall of the outer tank is provided with two rings of circumferential embedded parts 6, 7 and a plurality of vertical embedded parts 8. The wall lining plate is welded and fixed with the embedded parts installed on the concrete wall after the prefabrication of the lower material is completed. There are 720 wall lining plates for each unit, which are arranged circumferentially along the inner wall of the concrete. The wall lining plate of the storage tank is divided into upper wall lining plate 2 and lower wall lining plate 3, wherein the upper wall lining plate is vertically spliced by three plates (three joints one), and the three whole plates are prefabricated and spliced. The overall perpendicularity of the upper wall lining plate after the prefabrication and splicing is completed can meet the design requirements through quality control and auxiliary facilities in the splicing process. And the appropriate welding joint is reserved at the overlap joint of the two plates to ensure the welding quality of the wall lining plate and the embedded part in the later stage. The lower wall lining plate 3 is overlapped between the two rings of circumferential embedded parts 6, 7 (the length of the lower wall lining plate = the height of the outer tank top - the height of the upper wall lining plate - the height of the corner plate), and the lower wall lining plate is below the corner plate 4, which is overlapped with the lower ring of circumferential embedded parts 7 and the edge bottom plate.

[0039] The specific installation steps are as follows:

[0040] (1) First prefabrication: the upper wall lining plate is 144 pieces in total, each piece is spliced by three 10-meter-long steel plates to form a 30-meter-long lining plate, the lower corner plate is about 1 meter high, and the rest is filled with the lower wall lining plate;

[0041] a: The corner plate 4 is cut and blanked in the prefabrication yard using an inverter air plasma cutting machine. After the blanking is completed, the corner plate is rolled using a three-axis plate rolling machine. The corner plate is L-shaped, and the corner is circular. During rolling, the surfaces of the rollers should be smooth and free of foreign matter attached to the rolling rollers to prevent damage to the base material surface of the corner plate during rolling. In order to ensure the forming rate and rolling quality, a corner plate sample should be made according to the drawing for verification during and after rolling. The sample specification should comply with SH / T3537-2009. A 260mm reserved right angle edge is marked on the plate before rolling, and the sample should be used for timely verification during rolling to prevent excessive bending deformation.

[0042] b: The lower wall lining plate 3 is cut and blanked in the prefabrication yard using an inverter air plasma cutting machine. The cutting line should be straight during cutting, and the cutting surface should be free of cracks, slag, scarring and other defects. The blanked wall lining plate should be stored flat to prevent serious deformation of the wall lining plate.

[0043] c: The upper wall lining plate 2 uses whole plate, so there is no need to cut in the prefabrication yard, and the verticality of the three plates during splicing is strictly controlled. According to the actual construction requirements on site, several angle lines are determined by using total station or by the way of pulling line, and the short side of the wall lining plate close to the wall and one side of the long side of the upper wall lining plate are limited and controlled by welding angle steel 15 on the angle line. In this way, the spliced wall lining plate can be kept on the same horizontal line, and the overall verticality can meet the design requirements. According to the actual situation on site, it is found that the width and length of each wall lining plate will have certain differences, so special attention should be paid during splicing. If it is too wide or too long, it should be cut off in time. In order to ensure the effective welding of the overlap position of the two plates, the edge of the upper plate should be cut on both sides, and the size of the cut should meet the design requirements.

[0044] The wall lining plate is spliced and welded on the ground, which reduces the technical difficulty of welding construction and ensures the welding quality.

[0045] (2) Install the corner plate,

[0046] After the edge plate is completed, the installation of the corner plate can be carried out. When installing the corner plate, it should be installed from the starting position of the weld required by the design drawing, so as to avoid the overlap of the corner plate weld and the edge plate weld joint, and prevent the appearance of cross weld.

[0047] The corner plate is installed in the clockwise direction from 0°, and is installed by using the cooperation of the chain and the fixture during the installation process. The overlap amount between the two corner plates is strictly controlled to be 60mm, the overlap amount between the corner plate and the embedded part is 50mm, and the minimum overlap amount between the corner plate and the edge plate is 60mm. In the process of installing and welding the corner plate, in order to control the deformation of the corner plate, a diagonal support column 9 (such as Figure 3 ) for supporting the corner plate can be spot welded on the corner plate, so as to form a stable triangular structure between the corner plate and the edge plate of the bottom lining plate, and ensure that the welding deformation is controlled within the range required by the design.

[0048] (3) Install the lower wall lining plate

[0049] Before the lower wall lining plate is installed, two lifting lugs should be symmetrically welded on the upper side of the center line of the short side of the lower wall lining plate for cooperation with the chain block during installation. The verticality of the lower wall lining plate should be measured at any time during installation. If the posture of the lower wall lining plate changes, the horizontal and vertical degrees should be adjusted in time by using the chain block to ensure the accuracy of the installation of the lower wall lining plate. Before installation, "7" shaped positioning blocks 5 should be welded on the vertical embedded parts on the left side of the lower wall lining plate and the first circle of the circumferential embedded parts, respectively, to control the overlap size and verticality of the wall lining plate and the embedded parts. After the wall lining plate is hoisted to the designated position, the lower end surface of the lower wall lining plate is first brought into contact with the positioning blocks on the second circle of the circumferential embedded parts, and then the lower wall lining plate is adjusted to be aligned with the positioning blocks on the left side. After alignment, three positioning blocks are welded on the vertical embedded parts on the right side of the lower wall lining plate. Before the lower wall lining plate is welded, the wall lining plate is fixed to the embedded parts by the cooperation of the wedges and the positioning blocks to eliminate the gap between the lower wall lining plate and the embedded parts and ensure the welding quality.

[0050] (4) Installation of the upper wall lining plate

[0051] After the prefabricated splicing of the upper wall lining plate is completed, four left-right symmetric lifting lugs 10 (as shown in Figure 4 ) are welded on the upper end of the wall lining plate. The upper two lifting lugs 11 are used for connection with the electric hoist, and the lower two lifting lugs 12 are used for connection with the chain block after the lifting height of the wall lining plate reaches the lifting limit height of the electric hoist, and the wall lining plate is further lifted to the designed height by means of the chain block. The posture of the wall lining plate is adjusted by means of the chain block. In order to prevent excessive collision between the upper end of the wall lining plate and the wall during hoisting, the front two lifting lugs are connected with the hook of the electric hoist through the steel wire rope during hoisting to prevent excessive bending of the upper part. The installation position and angle of the lower two lifting lugs should be coordinated with the electric hoist and the steel wire rope used for hoisting. The installation position should fully consider the maximum lifting height provided by the electric hoist and the bending deformation caused by the excessive length of the wall lining plate above the lifting lugs and the friction collision with the wall. The best position of the lower two lifting lugs should be as close as possible to the overlap position of the wall lining plate and the pressure ring after the electric hoist reaches the maximum lifting limit, so as to reduce the lifting time by the chain block and improve the work efficiency. The length of the steel wire rope and the included angle formed between the two lifting lugs during hoisting should be fully considered during installation of the lower two lifting lugs to maximize the guarantee that the force acting on the installed lifting lugs is along the length direction of the welding seam and in the same straight line as the direction after the steel wire rope is pulled tight (that is, the lower lifting lugs 12 are inclined, as shown in Figure 6The force state of the lifting lug is most ideal, and a stable triangular structure is formed between the lifting lug and the steel wire rope. The two lifting lugs in the same row should be symmetrically welded along the central axis during installation, so that the wall lining plate can be kept in a natural vertical state during lifting as much as possible. After the welding of the lifting lug is completed, 100% PT detection should be performed on all lifting lugs before lifting operation, and a warning area should be set up and special safety protection personnel should be arranged for on-site safety management.

[0052] After the upper wall lining plate reaches the specified position, the ropes connecting the two lifting lugs 11 above the wall lining plate and the lower lifting lug 12 are removed, and hooks of the chain hoist are connected thereto. One side hook of the chain hoist is installed on the lifting lug welded on the compression ring in advance, and the other side hook is connected to the lifting lug above the wall plate. The length of the chain hoist is adjusted so that it is fully stressed. After the connection with the chain hoist is completed, the connection between the electric hoist and the two lifting lugs below is loosened. The horizontal and vertical degrees of the wall lining plate are adjusted by the chain hoist, and the bottom of the adjusted upper wall lining plate is placed on the positioning block welded on the upper ring embedded part, Figure 6 After the positioning block is welded on the right embedded part, the wall lining plate is limited and controlled to ensure the installation accuracy of the upper wall lining plate. After the position is adjusted, welding is performed.

[0053] The large full-containment low-temperature storage tank wall lining plate precise positioning installation method has the advantages of ground assembly and overall lifting, reduces the frequency of high-altitude operation and the safety risk of climbing operation, and ensures the welding quality of the weld and improves the one-time welding qualification rate. The cooperation of the electric hoist and the chain hoist reduces the safety risk of the previous single lifting, and the fine adjustment of the chain hoist and the auxiliary fixture "7" type positioning block limiting make the overlap amount between the wall lining plate and the embedded part precise, ensure the operation distance between the two wall lining plates during welding, and improve the welding quality. By improving the construction process and method of the wall lining plate, the installation efficiency and welding quality are greatly improved, and the overall construction cost is also reduced in a certain aspect.

[0054] The application optimizes the installation method and construction process of the upper and lower wall lining plates. The upper wall lining plate is provided with two groups of lifting lugs, an inverted chain and an electric hoist matched with each other, and a "7" type positioning block of an installation auxiliary tool is improved. The construction method is optimized, the installation precision of the 200,000 m 3 LNG low-temperature storage tank wall lining plate is improved, the positioning accuracy is high, the qualified rate of the welding joint assembly welding is improved to 99%, the wall lining plate is spliced and welded on the ground, the welding construction technical difficulty is reduced, the welding quality is ensured, the lifting points of the wall lining plate are provided with four lifting points, the installation precision of the wall lining plate is ensured, the cumbersome procedures in the previous construction process are reduced, and the installation efficiency is improved.

[0055] It should be noted that the above content only illustrates the technical idea of the application, and cannot be used to limit the protection scope of the application. For ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements fall within the protection scope of the claims of the application.

Claims

1. A large full containment cryogenic storage tank wall lining plate precise positioning installation method, characterized in that: It comprises the following steps: (1) prefabricating the tank wall lining plate, which is divided into upper and lower wall lining plates, wherein the upper wall lining plate is vertically spliced by N plates, and N>1; (2) prefabricating the corner plate; (3) arranging two rings of circumferential embedded parts and a plurality of vertical embedded parts on the outer wall of the outer tank; (4) installing the corner plate first, which is overlapped with the circumferential embedded parts and the edge bottom plate; (5) welding the lower wall lining plate between the two rings of circumferential embedded parts; (6) hoisting the upper wall lining plate: After the prefabricated splicing of the upper wall lining plate is completed, four symmetrical lifting lugs are welded at the upper end of the wall lining plate, wherein the upper two lifting lugs are used for connection with the electric hoist, and the lower two lifting lugs are used for connection with the chain after the lifting height of the wall lining plate reaches the lifting limit height of the electric hoist, and the wall lining plate is further lifted to the designed height by means of the chain, and the attitude of the wall lining plate is adjusted by means of the chain; in order to prevent excessive bending of the upper end of the wall lining plate during hoisting, the front two lifting lugs are connected with the hook of the electric hoist through a steel wire rope during hoisting; the installation position and angle of the lower two lifting lugs should be coordinated with the electric hoist and the steel wire rope used for hoisting; the best position of the lower two lifting lugs is that the upper end of the wall lining plate is as close as possible to the overlapping position of the pressure ring after the electric hoist reaches the maximum lifting limit, so as to reduce the lifting time by the chain; during installation of the lower two lifting lugs, the stress direction of the lifting lugs along the length direction of the weld is kept in the same straight line as the tension direction of the steel wire rope, and a stable triangular structure is formed between the lifting lugs and the steel wire rope; the two lifting lugs in the same row are symmetrically welded along the central axis during installation, so as to keep the wall lining plate in a natural vertical state during hoisting; Before hoisting the wall lining plate, the theoretical size of the wall lining plate required to be overlapped on the embedded part is measured, the position of the wall lining plate is confirmed, and a "7" type positioning block is welded; after the upper wall lining plate reaches the specified position, the ropes connected between the upper two lifting lugs and the lower two lifting lugs of the wall lining plate are removed, and hooks of the chain are used instead; one side of the hook of the chain is installed on the lifting lug welded on the pressure ring in advance, and the other side of the hook is connected with the upper lifting lug of the wall lining plate; the length of the chain is adjusted so that it is fully stressed; after the connection with the chain is completed, the connection between the electric hoist and the lower two lifting lugs is loosened; the verticality and horizontality of the wall lining plate are adjusted by means of the chain; the verticality and horizontality of the wall lining plate are measured by means of the theodolite and tape measure; after the measurement is confirmed to be correct, a "7" type positioning block is welded on the embedded part at the bottom of the wall lining plate for positioning; after the positioning is completed, the upper part of the wall lining plate and the pressure ring are welded to fix them, so as to prevent the wall lining plate from deviating and to ensure the positioning accuracy of the wall lining plate; (7) welding the upper wall lining plate.

2. The method according to claim 1, wherein the method is characterized in that: The length of the lower wall lining plate in step (1) is equal to the height of the top of the outer tank minus the height of the upper wall lining plate minus the height of the corner plate.

3. The precise positioning and installation method for the wall lining of a large full-containment cryogenic storage tank according to claim 1 is characterized by: The corner plate in step (2) is L-shaped, and the corner thereof is arc-shaped.

4. The method according to claim 1, wherein the method further comprises: After the installation of the corner plate in step (4) is completed, the oblique support column is spot-welded to control the deformation during welding.

5. The precise positioning and installation method for the wall lining of a large full-containment cryogenic storage tank according to claim 1 is characterized by: Before the lower wall lining plate is welded, positioning blocks are welded on the vertical embedded parts on the left side and the ring embedded parts on the lower side.

6. The precise positioning and installation method for the wall lining of a large full-containment cryogenic storage tank according to claim 1 is characterized by: In step (6), the bottom of the upper wall lining plate is placed on the positioning blocks of the ring embedded parts on the upper side, and is aligned with the three positioning blocks on the vertical embedded parts on the left side. After being in place, three positioning blocks are welded on the embedded parts on the right side to limit and control the upper wall lining plate.

7. The large full containment cryogenic storage tank wall liner precision positioning installation method according to claim 5 or 6, characterized in that: The positioning blocks are "7" type positioning blocks.

8. The precise positioning and installation method for the wall lining of a large full-containment cryogenic storage tank according to claim 1 is characterized by: In step (6), the inclination angle of the two lower lifting lugs is the same as the angle of the lifting rope.

9. The precise positioning and installation method for the wall lining of a large full-containment cryogenic storage tank according to claim 1 is characterized by: The welding mode is manual electric arc welding.

Images