B-type independent liquid cargo tank dome and insulated mounting method thereof

Abstract

The invention provides an insulated mounting method for a dome of a B-type independent liquid cargo tank and a dome structure, and the mounting method comprises the steps that the dome is mounted on the top surface of the liquid cargo tank, the dome comprises a top plate and side walls, the top plate comprises a dome watertight boundary and a dome non-watertight boundary which are oppositely arranged, and the side walls are in contact with the top surface of the liquid cargo tank; a plurality of bolts are arranged on the face, close to the dome non-watertight boundary, of the dome watertight boundary; a plurality of bolts are arranged on the side, away from the liquid cargo tank, of the side wall. Heat insulation plates are arranged between the adjacent bolts; a fence is provided, the upper portion of the non-watertight boundary of the dome is filled with a foaming material, and then the outer side of the side wall is filled with the foaming material; and after the foaming material is cured, the fence is removed. The problems of heat preservation, leakage management, complex structure adaptation and the like in insulation installation of the dome area of the B-type independent liquid cargo tank are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of the construction of liquid cargo tanks, and particularly to an installation method for the dome of a Type B independent liquid cargo tank and its insulation. Background Art

[0002] Liquefied gas carriers are used to transport cryogenic liquid cargoes such as liquefied petroleum gas (LPG) and liquefied natural gas (LNG). These liquid cargoes are loaded in the liquid cargo tanks of the liquefied gas carriers. Because the temperature of the liquid cargo is low, an insulating layer needs to be installed on the outer surface of the liquid cargo tank. The main purpose of the insulating layer of the liquid cargo tank is to prevent external heat from entering the interior of the liquid cargo tank and reduce the evaporation amount of the liquid cargo.

[0003] According to the type of the loaded liquid cargo, the working place, and other aspects, the liquid cargo tanks on liquefied gas carriers are divided into three types: Type A, Type B, and Type C. Among them, the structure of the Type B liquid cargo tank is complex and the temperature of the liquid cargo is lower. Therefore, an insulating layer must be provided. For the dome of the Type B liquid cargo tank, it has a more complex structure. The dome has injection and discharge channels for connection with external liquefaction equipment, and a small amount of liquid leakage is required for the Type B liquid cargo tank, so leakage channels must be provided. Therefore, key insulation is needed. Conventional thermal insulation technologies usually use single prefabricated panel splicing or single pouring and foaming methods. It is difficult to seamlessly splice the prefabricated insulation panels, and there is a risk of heat loss. Pouring and foaming will block the leakage channels. Therefore, the conventional insulation method cannot take into account the thermal insulation of complex structure areas and ensure that a small amount of leaked liquid can reach the corresponding storage area through the leakage channels. Summary of the Invention

[0004] In view of the problems existing in the thermal insulation performance of the liquid injection and discharge channels of the Type B liquid cargo tank in the above-mentioned prior art, the present application provides an installation method for the insulation of the dome of a Type B independent liquid cargo tank to solve the problems existing in the prior art.

[0005] To achieve the above and other related purposes, on the one hand, the present invention provides an installation method for the insulation of the dome of a Type B independent liquid cargo tank, which includes the following steps:

[0006] Install the dome on the top surface of the liquid cargo tank. The dome includes a top plate and side walls. The top plate includes a dome watertight boundary and a dome non-watertight boundary arranged oppositely. Contact the side walls with the top surface of the liquid cargo tank;

[0007] Set a plurality of bolts on the side of the dome watertight boundary close to the dome non-watertight boundary; set a plurality of bolts on the side of the side walls away from the liquid cargo tank;

[0008] Set insulation boards between adjacent bolts;

[0009] Provide a retaining fence, the retaining fence includes a first retaining fence and a second retaining fence, the first retaining fence is arranged above the non-watertight boundary of the dome, and the second retaining fence is arranged outside the side wall; the first retaining fence, the watertight boundary of the dome and the side wall form a first closed area, and the first retaining fence, the second retaining fence, the side wall and the top surface of the liquid cargo tank form a second closed area; a first filling port is arranged in the first closed area, and a second filling port is arranged in the second closed area;

[0010] Pour foaming material into the first closed area through the first filling port, and pour foaming material into the second closed area through the second filling port;

[0011] After the foaming material is cured, remove the retaining fence.

[0012] Optionally, the step of arranging a plurality of bolts on the side of the watertight boundary of the dome close to the non-watertight boundary of the dome includes:

[0013] A liquid tank surface wooden block and a support pad block are sequentially arranged on the side of the watertight boundary of the dome close to the non-watertight boundary of the dome;

[0014] The plurality of bolts are sequentially installed on the watertight boundary of the dome through the support pad block and the liquid tank surface wooden block.

[0015] Optionally, the step of arranging a plurality of bolts on the side of the side wall away from the liquid cargo tank includes:

[0016] A liquid tank surface wooden block and a support pad block are sequentially arranged on the side of the side wall away from the liquid cargo tank;

[0017] The plurality of bolts are sequentially installed on the side wall through the support pad block and the liquid tank surface wooden block.

[0018] Optionally, a heat preservation board is arranged between adjacent bolts:

[0019] A groove corresponding to the rib plate is formed in the heat preservation board;

[0020] The heat preservation board is arranged between the bolts, and the heat preservation board matches the rib plate;

[0021] Sealant is filled between the heat preservation board and the rib plate.

[0022] Optionally, there is a through hole between the bolt and the heat preservation board, and an elastic material is filled in the through hole.

[0023] Optionally, after removing the retaining fence, it further includes: arranging a protective layer on the outer surface of the foaming material.

[0024] Optionally, a sealant is filled between the heat-insulating protective layer and the rib plate.

[0025] The present invention also provides a Type B independent liquid cargo tank dome located at the top of the liquid cargo tank. The dome includes:

[0026] A top plate including a dome watertight boundary and a dome non-watertight boundary disposed opposite to each other;

[0027] A side wall located between the top plate and the top surface of the liquid cargo tank;

[0028] A heat-insulating board including a first heat-insulating board and a second heat-insulating board. The first heat-insulating board is located on one side of the dome watertight boundary close to the dome non-watertight boundary, and the second heat-insulating board is located on the side of the side wall away from the liquid cargo tank;

[0029] A foaming material is located between the dome watertight boundary and the dome non-watertight boundary, and on the side of the side wall away from the liquid cargo tank.

[0030] Optionally, it further includes:

[0031] A liquid tank surface wooden block is located on one side of the dome watertight boundary close to the dome non-watertight boundary, and on the side of the side wall away from the liquid cargo tank;

[0032] A support cushion block is in contact with the liquid tank surface wooden block, and is located on the side of the liquid tank surface wooden block away from the dome watertight boundary, and on the side of the liquid tank surface wooden block away from the liquid cargo tank;

[0033] A plurality of bolts sequentially penetrate through the heat-insulating board, the support cushion block, and the liquid tank surface wooden block.

[0034] Optionally, a leakage channel is formed between the first heat-insulating board and the dome watertight boundary, and a leakage channel is formed between the second heat-insulating board and the side wall. The width of the leakage channel is equal to the sum of the height of the liquid tank surface wooden block and the height of the support cushion block.

[0035] As described above, the installation method, manufacturing method, and display device of the insulation of the Type B independent liquid cargo tank dome provided by the present invention at least have the following beneficial technical effects:

[0036] The installation method of the dome insulation of the Type B independent liquid cargo tank of the present invention can significantly reduce the heat transfer from the outside of the liquid cargo tank by pre-forming insulation boards and combining foaming materials, ensuring stable heat insulation performance even at low temperatures; a leakage channel is reserved in the design of bolts and insulation boards to ensure that a small amount of leaked liquid can flow into the leakage groove in a directed manner; in addition, during distributed construction, the foaming material above the top plate is formed first, and then the foaming material on the side wall is formed, effectively solving the installation of irregular areas such as the dome and rib plates; and the gaps are filled with sealant to further improve the sealing performance. Brief Description of the Drawings

[0037] Figure 1 It shows a flow chart of the installation method of the dome insulation of the Type B independent liquid cargo tank provided in the first embodiment.

[0038] Figure 2 It shows a schematic diagram of the overall structure of the liquid cargo tank.

[0039] Figure 3 It shows a schematic diagram of the dome.

[0040] Figure 4 It shows Figure 3 A top view of the shown dome.

[0041] Figure 5 It shows a schematic diagram of the structure of the dome with insulation boards installed.

[0042] Figure 6 It shows Figure 5 An enlarged view of the shown Area A

[0043] Figure 7 It shows a schematic diagram of the structure of the dome with enclosures installed.

[0044] Figure 8 It shows a schematic diagram of the structure of the dome after insulation installation.

[0045] Reference Signs

[0046] 1. Liquid cargo tank; 10. Dome; 20. Top plate; 201. Inspection opening; 202. Pipeline opening; 21. Dome watertight boundary; 22. Dome non-watertight boundary; 23. Rib plate; 30. Side wall; 40. Bolt; 41. Liquid tank surface wooden pad; 42. Support cushion block; 50. Insulation board; 51. Groove; 52. Through hole; 53. First insulation board; 54. Second insulation board; 60. Leakage channel; 70. Sealant; 80. First enclosure; 81. Second enclosure; 82. Support member; 821. Support member base; 822. Support rod; 90. Foaming material; 100. Adhesive strip. Detailed Description of the Embodiment

[0047] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0048] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Although only the components related to the present invention are shown in the illustrations and are not drawn according to the number, shape, and size of the components in actual implementation, the form, quantity, positional relationship, and ratio of each component in actual implementation can be arbitrarily changed on the premise of implementing the technical solution of the present invention, and the component layout form may also be more complex.

[0049] Embodiment 1

[0050] This embodiment provides a method for installing the dome insulation of a Type B independent liquid cargo tank, as Figure 1 shown, which shows the flow chart of the method for installing the dome insulation of a Type B independent liquid cargo tank provided in this embodiment; specifically, it includes the following steps:

[0051] S1: Install the dome on the top surface of the liquid cargo tank. The dome includes a top plate and side walls. The top plate includes a dome watertight boundary and a dome non-watertight boundary arranged oppositely. Contact the side walls with the top surface of the liquid cargo tank;

[0052] S2: Set a plurality of bolts on the side of the dome watertight boundary close to the dome non-watertight boundary; Set a plurality of bolts on the side of the side wall away from the liquid cargo tank;

[0053] S3: Set heat preservation boards between adjacent bolts;

[0054] S4: Provide a fence, which includes a first fence and a second fence. Set the first fence above the dome non-watertight boundary, and set the second fence outside the side wall; The first fence, the dome watertight boundary, and the side wall form a first closed area, and the first fence, the second fence, the side wall, and the top surface of the liquid cargo tank form a second closed area; A first pouring port is provided in the first closed area, and a second pouring port is provided in the second closed area;

[0055] S5: Pour the foaming material 90 into the first closed area through the first pouring port, and pour the foaming material 90 into the second closed area through the second pouring port;

[0056] S6: After the foaming material 90 is cured, remove the fence.

[0057] Specifically, in step S1, as shown in Figure 2 , it is shown as a schematic diagram of the overall structure of the liquid cargo tank; the dome 10 is arranged on the top surface of the liquid cargo tank 1, and the dome 10 is communicated with the liquid cargo tank 1. As shown in Figure 3 , it is shown as a schematic diagram of the dome; the dome 10 includes a top plate 20 and a side wall 30. The side wall 30 includes four surfaces, and the side wall 30 of the dome 10 is in contact with the top surface of the liquid cargo tank 1, and the side wall 30 of the dome 10 is connected to the top surface of the liquid cargo tank 1 by connection means such as welding or bolts. As shown in Figure 4 , it is shown as Figure 3 the top view of the dome shown; a plurality of openings are provided on the top plate 20 of the dome 10, including an inspection opening 201 and a pipeline opening 202, etc. The inspection opening 201 is used for allowing personnel to enter the interior of the dome for inspection or maintenance; the pipeline opening 202 is used for placing various pipelines (including drainage and exhaust pipelines) for connecting the liquid cargo tank 1 with external equipment (such as a reliquefaction pump, a pressure valve, etc.) to ensure the directional flow of liquid and gas.

[0058] As shown in Figure 2 , the top plate 20 includes a dome watertight boundary 21 and a dome non - watertight boundary 22 which are oppositely arranged, and a plurality of rib plates 23 are arranged between the dome watertight boundary 21 and the dome non - watertight boundary 22. The dome watertight boundary 21 and the liquid cargo tank 1 form a closed structure, and the rib plates 23 are evenly distributed between the dome watertight boundary 21 and the dome non - watertight boundary 22 to enhance the overall rigidity and bending resistance of the dome, and prevent deformation or cracking caused by the weight of the liquid cargo or external loads (such as ship vibration).

[0059] Optionally, the installation of the insulation layer on the surface of the liquid cargo tank 1 is after installing the dome 10 on the top surface of the liquid cargo tank 1. Ensure that the distance between the insulation layer on the surface of the liquid cargo tank 1 and each side wall 30 of the dome 10 is greater than or equal to 500 mm to reserve sufficient space for dome insulation installation, and the excess insulation part on the surface of the liquid cargo tank 1 should be removed in time. Then, the inner and outer sides of the side wall 30, and the bottom surface of the dome watertight boundary 21 and the top surface of the dome non - watertight boundary 22 of the top plate 20 are polished to remove rust. After polishing and rust removal, an anti - rust primer is sprayed. The anti - rust primer is made of materials such as iron red or aluminum powder. In this embodiment, the anti - rust primer is an inorganic zinc - rich primer. After the anti - rust primer is cured, the side wall 30 and the top plate 20 are surface - cleaned to remove water, oil, dust and other contaminants, and then an anti - corrosion layer is sprayed on the inner and outer sides of the side wall 30 and the top plate 20. The anti - corrosion layer can not only prevent water or moisture from entering the subsequent foaming material 90, but also improve the adhesion between the cryogenic steel surface of the liquid cargo tank 1 and the foaming material 90 because the tensile strength of the anti - corrosion layer material is higher than the tensile strength directly connected with the foaming material 90 and the liquid cargo tank 1. Specifically, the anti - corrosion layer material is an inorganic zinc primer.

[0060] Specifically, step S2: A plurality of bolts are provided on the side of the dome watertight boundary close to the dome non-watertight boundary; a plurality of bolts are provided on the side of the side wall away from the liquid cargo tank; S3: A heat preservation board is arranged between adjacent bolts; as Figure 5 It shows a schematic structural diagram of installing a heat preservation board on the dome; as Figure 6 shown, it shows Figure 5 An enlarged view of area A shown in the figure; The specific steps of arranging a plurality of bolts 40 on the side of the dome watertight boundary 21 close to the dome non-watertight boundary 22 include: A liquid tank surface wooden block 41 and a support cushion block 42 are sequentially arranged on the side of the dome watertight boundary 21 close to the dome non-watertight boundary 22; A plurality of bolts 40 are sequentially passed through the support cushion block 42 and the liquid tank surface wooden block 41 and installed on the dome watertight boundary 21; The specific steps of arranging a plurality of bolts 40 on the side of the side wall 30 away from the liquid cargo tank 1 include: A liquid tank surface wooden block 41 and a support cushion block 42 are sequentially arranged on the side of the side wall 30 away from the liquid cargo tank 1; A plurality of bolts 40 are sequentially passed through the support cushion block 42 and the liquid tank surface wooden block 41 and installed on the side wall 30. The liquid tank surface wooden block 41 not only plays a supporting role, but also can buffer the external impact to a certain extent. The height of the support cushion block 42 can be adjusted to eliminate the local error caused by the deformation of the surface of the type B liquid cargo tank 1.

[0061] Generally, the number of bolts 40 is set according to the actual size of the dome 10. Generally, the number of bolts 40 installed on the top plate 20 ranges from 10 to 100, and the number of bolts 40 installed on each side wall 30 ranges from 10 to 100. The length of the bolt 40 is selected according to actual needs. Specifically, the length of the bolt 40 is greater than the sum of the height of the liquid tank surface wooden block 41 and the height of the support cushion block 42, and a certain length also needs to be reserved for installing the heat preservation board 50. Generally, the sum of the height of the liquid tank surface wooden block 41 and the height of the support cushion block 42 ranges from 15 to 25 mm, and the length of the bolt 40 ranges from 60 to 100 mm. In this embodiment, the sum of the height of the liquid tank surface wooden block 41 and the height of the support cushion block 42 is equal to 20 mm, and the length of the bolt 40 is equal to 80 mm.

[0062] As Figure 5As shown, the thermal insulation panel 50 is installed between adjacent bolts 40. Specifically, the thermal insulation panel 50 includes a first thermal insulation panel 53 and a second thermal insulation panel 54. The first thermal insulation panel 53 is located on the side of the dome watertight boundary 21 close to the dome non-watertight boundary 22, and the second thermal insulation panel 54 is located on the side of the side wall away from the cargo tank 1. Generally, the thickness of the thermal insulation panel 50 is between 40 and 80 mm, and further, between 50 and 60 mm. In this embodiment, the sum of the thickness of the thermal insulation panel 50, the height of the cargo tank surface wooden block 41, and the height of the support block 42 is equal to the length of the bolt 40. Specifically, the thickness of the thermal insulation panel 50 in this embodiment is 60 mm. A leakage channel 60 is formed between the thermal insulation panel 50 and the dome watertight boundary 21. A cargo tank surface wooden block 41 and a support block 42 are arranged between the thermal insulation panel 50 and the dome watertight boundary 21. Therefore, the width of the leakage channel 60 is equal to the sum of the height of the cargo tank surface wooden block 41 and the height of the support block 42. Generally, the height of the leakage channel 60 is between 15 and 25 mm. In this embodiment, the height of the leakage channel 60 is 20 mm. The leakage channel 60 ensures that in the case of a small amount of liquid leakage in the Type B cargo tank, the leaked liquid can smoothly pass through the leakage channel 60 to reach the designated leakage container without causing additional damage to the tank body and the insulating material.

[0063] Optionally, the first thermal insulation panel 53 located above the dome watertight boundary 21 and the second thermal insulation panel 54 located outside the side wall 30 can be installed simultaneously. It is also possible to install the first thermal insulation panel 53 first and then install the second thermal insulation panel 54. Preferably, the first thermal insulation panel 53 located above the dome watertight boundary 21 is installed first, and then the second thermal insulation panel 54 located outside the side wall 30 is installed. Optionally, there may be a gap between the first thermal insulation panel 53 and the second thermal insulation panel 54, and a sealant 70 is used to fill the gap to further improve the sealing effect. The dome watertight boundary 21 is a key anti-seepage area. Prioritizing the installation of the thermal insulation panel 50 above it can ensure that the joint sealant 70 cures in an unobstructed state to form a continuous and closed waterproof interface. The top-down installation sequence can prevent contaminants such as debris and glue residues generated during the construction of the side wall 30 from adhering to the surface of the dome 10 thermal insulation panel that has been completed, causing secondary pollution.

[0064] Optionally, arranging the heat preservation board 50 between adjacent bolts 40 further includes: forming grooves 51 corresponding to the rib plates 23 in the heat preservation board 50; arranging the heat preservation board 50 between the bolts 40, and making the heat preservation board 50 match the rib plates 23; filling a sealant 70 between the heat preservation board 50 and the rib plates 23. The specific steps include: according to the position and size of the rib plates 23 in the dome 10, using a numerical control cutting machine or a manual grooving tool to cut grooves 51 with the same cross-sectional shape as the rib plates 23 on the surface of the heat preservation board 50. Optionally, the depth of the grooves needs to be reserved 2-3 mm more than the height of the rib plates to accommodate the sealant filling space; embedding the heat preservation board 50 with grooves 51 between the bolts 40 to ensure that the grooves 51 are completely aligned with the rib plates 23; using the sealant 70, optionally selecting a low-temperature resistant elastic sealant 70 (such as polyurethane sealant), and evenly injecting it along the joint between the grooves 51 and the rib plates 23 through a caulking gun to ensure full filling without bubbles.

[0065] Optionally, there may be gaps in the area where the bolts 40 are in contact with the heat preservation board 50. To ensure the stability of the structure, an elastic material can be filled in the gaps. Specifically, in this embodiment, through holes 52 are provided in the area where the bolts 40 are in contact with the heat preservation board 50, and an elastic material is filled in the through holes 52. Generally, the width of the through holes 52 is between 3 and 5 mm, and the longitudinal length of the through holes 52 is between 40 and 80 mm. When the temperature changes, the elastic material in the through holes 52 will undergo a certain deformation to offset a part of the internal stress suffered by the heat preservation board 50 due to thermal expansion and contraction. Preferably, the elastic material is glass wool.

[0066] Step S4: Provide a fence, which includes a first fence 80 and a second fence 81. Arrange the first fence 80 above the non-watertight boundary 22 of the dome, and arrange the second fence 81 outside the side wall 30; the first fence 80, the watertight boundary 21 of the dome, and the side wall 30 form a first closed area, and the first fence 80, the second fence 81, the side wall 30, and the top surface of the liquid cargo tank form a second closed area; a first filling port is provided in the first closed area, and a second filling port is provided in the second closed area. Figure 7, a retaining wall or a mold cavity is provided, and the retaining wall is sleeved on the dome 10 from top to bottom. In this embodiment, the retaining wall includes a first retaining wall 80 and a second retaining wall 81. The first retaining wall 80 is located above the non-watertight boundary 22 of the dome. Generally, both the length and width of the first retaining wall 80 are greater than the length and width of the non-watertight boundary 22 of the dome. Specifically, the difference between the boundary of the first retaining wall 80 and the boundary of the non-watertight boundary 22 of the dome is between 150 mm and 200 mm. In this embodiment, both the length and width of the first retaining wall 80 are 150 mm longer than the length and width of the non-watertight boundary 22 of the dome. Similarly, the second retaining wall 81 is located on the side of the side wall 30, and the difference between the boundary of the second retaining wall 81 and the boundary of the side wall 30 is between 150 mm and 200 mm. In this embodiment, both the length and width of the second retaining wall 81 are 150 mm longer than the length and width of the side wall 30. Specifically, in this embodiment, there are 4 sides of the side wall 30, and correspondingly, the second retaining wall 81 is also 4 sides. Optionally, the non-watertight boundary 22 of the dome can be square, rectangular or other shapes, and the sizes of each side wall 30 can be the same or different, and are designed according to the specific actual situation. Therefore, the sizes of the first retaining wall 80 and the second retaining wall 81 are adjusted accordingly according to the side wall 30.

[0067] Specifically, as Figure 7 shown, when the retaining wall is sleeved on the dome 10, the retaining wall should meet the following conditions: the first retaining wall 80, the watertight boundary 21 of the dome and the side wall 30 form a first closed area B; the first retaining wall 80, the second retaining wall 81, the side wall 30 and the top surface of the liquid cargo tank form a second closed area C. Specifically, a first filling port is provided on the first closed area B, and a second filling port is provided in the second closed area C. The position of the filling port can be set according to the actual situation, and the specific position is not limited in this embodiment.

[0068] Optionally, the second retaining wall 81 is located at the edge and is subject to gravity, so a support member 82 is used to support the second retaining wall 81. The support member 82 includes a support member base 821 and a support rod 822. The support member base 821 is in contact with the second retaining wall 81, and the support rod 823 is in contact with the hull. Optionally, according to the predetermined position of the second retaining wall 81, the specific position of the support member 82 is marked on the hull.

[0069] S5: Pour the foaming material 90 into the first closed area B through the first filling port, and pour the foaming material 90 into the second closed area C through the second filling port; fill the entire closed area with the foaming material 90. Optionally, the foaming material 90 includes: polyurethane foam, polyisocyanurate foam, phenolic foam, etc. that meet the requirements of low-temperature heat insulation, high closed-cell rate, strong compressive strength, and corrosion resistance. In this embodiment, polyurethane foam is selected as the foaming material 90.

[0070] Specifically, as Figure 8As shown, there is a certain gap between the foaming material 90 outside the side wall 30 and the top surface of the liquid cargo tank 1. This gap is the leakage channel 60. To ensure the smoothness of the leakage channel, the foaming material 90 close to the top surface of the liquid cargo tank 1 is connected to the top surface of the liquid cargo tank 1 through an adhesive strip 100.

[0071] S6: As Figure 8 shown, after the foaming material 90 is cured, remove the enclosure.

[0072] Specifically, the curing methods include conventional methods such as standing, heating, and pressurizing. According to the selected foaming material 90, a suitable curing method is selected. Specifically, in this embodiment, the foaming material 90 is cured by standing for one hour.

[0073] Specifically, the thickness of the cured foaming material 90 is between 150 mm and 200 mm. In this embodiment, the thickness of the cured foaming material 90 is 150 mm. The overall thickness of the insulation layer includes the thickness of the insulation board 50 and the thickness of the foaming material 90. Generally, the thickness of the insulation layer is between 200 and 300 mm, so that the dome directly exposed to the atmosphere has sufficient insulation thickness to ensure that the Type B independent liquid tank maintains a stable low evaporation rate. In this embodiment, the thickness of the insulation layer is 200 mm.

[0074] Optionally, the step of pouring the foaming material 90 into the closed area includes: pouring into the first closed area A and the second closed area B simultaneously, or pouring into the first closed area A first, or pouring into the second closed area B first. Preferably, after pouring the foaming material 90 into the first closed area A for curing, then pour the foaming material 90 into the second closed area B and cure it. Because, prior construction at the top can form a complete covering layer, avoiding the failure of the top seal caused by the disturbance of the side construction.

[0075] Optionally, for the convenience of removing the enclosure, before pouring the foaming material 90 through the pouring port, a demolding sheet is laid on the inner surfaces of the first enclosure 80 and the second enclosure 81.

[0076] Specifically, after removing the enclosure, sealant 70 is filled again in the dome watertight boundary 21, the dome non-watertight boundary and the corner gaps, and between the insulation layers on the side wall 30 and the insulation layer on the liquid cargo tank 1 to further ensure the insulation effect.

[0077] Optionally, an insulation protective layer is provided on the outer surface of the foaming material 90. Optionally, the insulation protective layer is a polyol or isocyanate material. It plays a protective role for the foaming material 90.

[0078] The installation method of the dome of the Type B independent liquid cargo tank provided in this embodiment can significantly reduce the heat transfer into the outside of the liquid cargo tank by pre-forming the insulation board and combining with the foaming material 90, ensuring stable heat insulation performance even at low temperatures; a leakage channel is reserved in the design of the bolts and the insulation board to ensure that a small amount of leaked liquid can flow into the leakage groove directionally; in addition, during the distributed construction, the foaming material 90 above the top plate is formed first, and then the foaming material 90 on the side wall is formed, effectively solving the installation of irregular areas such as the dome and the rib plate; the gap is filled with sealant to further improve the sealing performance.

[0079] Embodiment 2

[0080] This embodiment also provides a dome of a Type B independent liquid cargo tank, as Figure 8 shown, a schematic structural diagram of the dome of the Type B independent liquid cargo tank in this embodiment.

[0081] The dome of the Type B independent liquid cargo tank provided in this embodiment includes: the top plate 20 includes a dome watertight boundary 21 and a dome non-watertight boundary 22 which are oppositely arranged; the side wall 30 is located between the top plate 20 and the top surface of the liquid cargo tank 1; the insulation board 50 includes a first insulation board 53 and a second insulation board 54, the first insulation board 53 is located on one side of the dome watertight boundary 21 close to the dome non-watertight boundary 22, and the second insulation board 54 is located on the side of the side wall 30 far from the liquid cargo tank 1; the foaming material 90 is located between the dome watertight boundary 21 and the dome non-watertight boundary 22, and on the side of the side wall 30 far from the liquid cargo tank 1.

[0082] Generally, as Figure 8 shown, the height of the second insulation board 54 outside the side wall 30 is equal to the sum of the height of the dome 10 and the thickness of the first insulation board 53 formed above the top plate 20; optionally, in another embodiment, the length of the first insulation board 53 on the upper side of the top plate 20 is equal to the sum of the overall length of the dome 10 and the thickness of the second insulation board 54 outside the side wall 30.

[0083] In this embodiment, the method shown in Embodiment 1 is adopted to form the Figure 8 structure shown. First, the foaming material 90 is filled above the first insulation board 53, and then the foaming material 90 is formed on the second insulation board 54. The foaming material 90 on the first insulation board 53 is installed first as a reference layer, and the actual height of the dome 10 can be accurately measured to ensure that the installation height of the second insulation board 54 (outside the side wall) is completely matched with the dome structure.

[0084] Optionally, in another embodiment, the foaming material 90 outside the second insulation board 54 is formed first, and then the foaming material 90 above the first insulation board 53 is formed. The first insulation board 53 takes the second insulation board 54 as the reference layer, and due to the gravity of the side wall 30, the second insulation board 54 will be deformed due to gravity and vibration.

[0085] Optionally, the dome further includes a liquid tank surface spacer 41, which is located on one side of the dome watertight boundary 21 close to the dome non-watertight boundary 22, and on one side of the side wall 30 away from the liquid cargo tank 1; a support spacer 42, which is in contact with the liquid tank surface spacer 41, is located on one side of the liquid tank surface spacer 41 away from the dome watertight boundary 21, and on one side of the liquid tank surface spacer 41 away from the liquid cargo tank 1; and a plurality of bolts 40, which sequentially penetrate through the insulation board 50, the support spacer 42, and the liquid tank surface spacer 41.

[0086] Specifically, a leakage channel 60 is formed between the first insulation board 53 and the dome watertight boundary 21, and a leakage channel 60 is formed between the second insulation board 54 and the side wall 30. The width of the leakage channel 60 is equal to the sum of the height of the liquid tank surface spacer 41 and the height of the support spacer 42.

[0087] Optionally, a sealant 70 is filled in the gap between the insulation board 50 and the rib plate 23; a sealant 70 is filled between the insulation layer formed on the dome 10 and the insulation layer formed on the liquid cargo tank 1.

[0088] Optionally, there is also an insulation protection layer outside the dome 10.

[0089] In summary, the insulation layer of the B-type independent liquid cargo tank dome provided in this embodiment adopts a combination of an insulation board and a foaming material 90, which can achieve seamless integration of the leakage channel and the insulation layer, and takes into account both the sealing performance and the diversion function.

[0090] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for installing the dome insulation of an independent liquid cargo tank of type B, characterized in that, Comprising the following steps: Install the dome on the top surface of the liquid cargo tank. The dome includes a top plate and side walls. The top plate includes a dome watertight boundary and a dome non-watertight boundary which are oppositely arranged. Contact the side walls with the top surface of the liquid cargo tank; Arrange a plurality of bolts on the side of the dome watertight boundary close to the dome non-watertight boundary; arrange a plurality of bolts on the side of the side walls away from the liquid cargo tank; Arrange heat preservation boards between adjacent bolts; Provide a fence. The fence includes a first fence and a second fence. Arrange the first fence above the dome non-watertight boundary, and arrange the second fence outside the side walls; the first fence, the dome watertight boundary and the side walls form a first closed area, and the first fence, the second fence, the side walls and the top surface of the liquid cargo tank form a second closed area; a first pouring port is arranged in the first closed area, and a second pouring port is arranged in the second closed area; Pour foaming material into the first closed area through the first pouring port, and pour foaming material into the second closed area through the second pouring port; After the foaming material is cured, remove the fence.

2. The installation method of the dome insulation of the Type B independent liquid cargo tank according to claim 1, characterized in that, The step of arranging a plurality of bolts on the side of the dome watertight boundary close to the dome non-watertight boundary includes: Sequentially arrange a liquid tank surface wooden block and a support cushion block on the side of the dome watertight boundary close to the dome non-watertight boundary; Sequentially penetrate the support cushion block and the liquid tank surface wooden block with the plurality of bolts and install them on the dome watertight boundary.

3. The installation method of the dome insulation of the Type B independent liquid cargo tank according to claim 1, characterized in that The step of arranging a plurality of bolts on the side of the side walls away from the liquid cargo tank includes: Sequentially arrange a liquid tank surface wooden block and a support cushion block on the side of the side walls away from the liquid cargo tank; Sequentially penetrate the support cushion block and the liquid tank surface wooden block with the plurality of bolts and install them on the side walls.

4. The installation method of the dome insulation of the Type B independent liquid cargo tank according to claim 1, characterized in that Arrange heat preservation boards between adjacent bolts: Form grooves corresponding to the rib plates in the heat preservation boards; Arrange the heat preservation boards between the bolts, and the heat preservation boards match the rib plates; Fill sealant between the heat preservation boards and the rib plates.

5. The installation method of the dome insulation of the Type B independent liquid cargo tank according to claim 1, characterized in that, It further includes that there are through holes between the bolts and the heat preservation boards, and elastic materials are filled in the through holes.

6. The installation method of the dome insulation of the Type B independent liquid cargo tank according to claim 1, characterized in that, After removing the fence, it further includes: arranging a protective layer on the outer surface of the foaming material.

7. The installation method of the dome insulation of the Type B independent liquid cargo tank according to claim 6, characterized in that, Fill sealant between the protective layer and the rib plates.

8. An independent Type B liquid cargo tank dome, located at the top of the liquid cargo tank, is characterized in that, The dome includes: A top plate, including a dome watertight boundary and a dome non-watertight boundary which are oppositely arranged; Side walls, located between the top plate and the top surface of the liquid cargo tank; Heat preservation boards, including a first heat preservation board and a second heat preservation board. The first heat preservation board is located on the side of the dome watertight boundary close to the dome non-watertight boundary, and the second heat preservation board is located on the side of the side walls away from the liquid cargo tank; Foaming material, located between the dome watertight boundary and the dome non-watertight boundary, and on the side of the side walls away from the liquid cargo tank.

9. The dome of the independent liquid cargo tank of type B according to claim 8, characterized in that, It further includes: Liquid tank surface wooden blocks, located on the side of the dome watertight boundary close to the dome non-watertight boundary, and on the side of the side walls away from the liquid cargo tank; Support pads, which are in contact with the liquid tank surface timbers, are located on the side of the liquid tank surface timbers away from the dome watertight boundary and on the side of the liquid tank surface timbers away from the cargo tank. A plurality of bolts sequentially penetrate through the insulation board, the support pads and the liquid tank surface timbers.

10. The Type B independent liquid cargo tank dome according to claim 9, characterized in that, A leakage channel is formed between the first insulation board and the dome watertight boundary, and the leakage channel is formed between the second insulation board and the side wall. The width of the leakage channel is equal to the sum of the height of the liquid tank surface timbers and the height of the support pads.

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