A Type B liquid tank insulation system

Abstract

This application relates to a Type B liquid tank insulation system, specifically for liquefied gas storage tanks. The system is positioned between two adjacent insulating plates on the tank surface. Each insulating plate is covered with a protective layer, and polyurethane is filled between the two insulating plates. A waterproof layer is provided on the surface of the polyurethane layer, covering the outside of the joint between the polyurethane and the protective layer and bonded to the surfaces of the two protective layers. This application improves the waterproof capability of the insulating plates on the surface of Type B liquid tanks.

Description

Technical Field

[0001] This application relates to the technical field of liquefied gas storage tanks, and in particular to a type B liquid tank insulation system. Background Technology

[0002] Liquefied gas storage tanks are specialized equipment for storing liquefied petroleum gas (LPG), classified as special equipment and Class III pressure vessels. Liquefied gas storage tanks have stringent quality requirements regarding the materials of pressure-bearing components, external dimensions and weld quality, operational quality, installation quality, internal devices, and safety accessories. GTT is a leader in the design of membrane-type cargo tanks, and its technology is widely used in LNG carrier transportation and other fields, enjoying high market recognition. Its Mark III membrane technology is a leader in developing 150,000 cubic meter ULECs, enabling lighter ships with shallower drafts, allowing them to enter most ports. With the increasing global demand for clean energy, the LNG transportation market continues to develop, driving the expansion of the TYPE B-type tank market. For example, the successful shipment of the largest IMO independent B-type cargo tank built by Nantong CIMC Pacific Offshore Engineering Co., Ltd. for Hudong-Zhonghua Shipbuilding (Group) Co., Ltd. demonstrates the development in the B-type tank field and reflects market demand. In recent years, the domestic market has seen a large number of LNG B-type fuel tanks or very large ethane carriers, all of which are B-type tanks.

[0003] The insulation structure of the GTT membrane-type liquid cargo tank is located inside the tank body, avoiding the risk of moisture absorption due to its design. In contrast, the insulation layer of the Type B tank covers the outer surface of the liquid tank, and most of the insulation work must be completed before the liquid tank is placed inside. Due to current construction limitations, after most of the insulation work is completed, the liquid tank must be stored outdoors for a period of time, and areas where insulation work is not completed are at risk of water seepage. If water accidentally gets into the insulation layer, subsequent drying and inerting operations will face an exponential increase in time and gas costs—not only will the drying process take longer, but the consumption of inert gas will also increase significantly, thus putting considerable pressure on overall construction efficiency and cost control.

[0004] In existing technologies, butyl tape is often used as a waterproofing measure for the interface area and reserved parts of the plate insulation structure. However, the length of time that the Type B compartment is placed outdoors varies, and the weather conditions during the placement period are different. It is difficult to meet the waterproofing requirements of the insulation layer by using only butyl tape. Utility Model Content

[0005] To meet the waterproofing requirements of the surface insulation layer of a Type B liquid tank that is placed outdoors for extended periods, this application provides a Type B liquid tank insulation system.

[0006] The technical solution for the type B liquid tank insulation system provided in this application is as follows: A type B liquid tank insulation system is provided between two adjacent insulating plates on the surface of the tank. The surfaces of the two insulating plates are covered with a protective layer, and polyurethane is filled between the two insulating plates. A waterproof layer is provided on the surface of the polyurethane. The waterproof layer covers the outside of the joint between the polyurethane and the protective layer and is bonded to the surface of the two protective layers.

[0007] By adopting the above technical solution, the protective layer covering the surface of the insulation board can protect the surface of the insulation board, and the polyurethane filled between the two insulation boards can form a support for the waterproof layer, which can reduce the occurrence of waterproof failure caused by the edge of the waterproof layer peeling off due to rainwater erosion and the weight of accumulated water.

[0008] Preferably, the protective layer comprises an aluminum sheet.

[0009] Preferably, the outer surface of the aluminum sheet near the polyurethane side is roughened by grinding.

[0010] By adopting the above technical solution, the roughened area can improve the bonding strength between the waterproof layer and the aluminum skin, reducing the occurrence of waterproof failure.

[0011] Preferably, the waterproof layer comprises a layer of polyurea sprayed onto the surface of polyurethane or aluminum sheet using a spray gun.

[0012] By adopting the above technical solution, polyurea, as a waterproof layer, can appropriately reduce the strength requirements of the crack-resistant layer in the insulation layer, reduce material costs, processing costs and construction costs, and also play a role in delaying the aging of polyurethane and resisting mechanical damage.

[0013] Preferably, the top surface of the polyurethane is flush with the outer surface of the two insulating plates, and polyurea is filled between the top surface of the polyurethane and the two insulating plates.

[0014] By adopting the above technical solution, the surface of polyurethane is filled with thickened polyurea, which can further improve the strength of the polyurea layer.

[0015] Preferably, the waterproof layer includes butyl tape, the top surface of the polyurethane is flush with the outer surface of the two insulating boards, the top surface of the polyurethane is filled with low-temperature adhesive, the top surface of the low-temperature adhesive is flush with the outer surface of the two aluminum sheets, and the low-temperature adhesive is filled between the butyl tape and the polyurethane.

[0016] By adopting the above technical solution, the low-temperature adhesive and aluminum sheet form a liquid seal, which can prevent the entry of external liquids. The butyl tape pasted on the surface can form mechanical protection and prevent the adhesive from aging. At the same time, the butyl tape can prevent most of the moisture from entering.

[0017] Preferably, the waterproof layer includes butyl tape, the top surface of the polyurethane is flush with the outer surface of the two insulating boards, the top surface of the polyurethane is filled with low-temperature adhesive, and the top surface of the low-temperature adhesive is lower than the outer surface of the aluminum sheet. The joints between the low-temperature adhesive and the aluminum sheet on both sides are filled with liquid butyl, and the butyl tape covers the surface of the low-temperature adhesive, the liquid butyl, and the aluminum sheet.

[0018] By adopting the above technical solution, low-temperature adhesive can enhance the bonding strength between butyl tape and polyurethane surface. Due to on-site dust and pits on the aluminum sheet surface, 100% adhesion between butyl tape and aluminum sheet is not possible. However, liquid butyl can improve the bonding strength between butyl tape and aluminum sheet. Furthermore, liquid butyl is easily deformable and does not harden over time. When applying butyl tape, the height difference between polyurethane and aluminum sheet can be sealed, thus sealing the only water inlet and achieving the long-term liquid tightness requirement.

[0019] In summary, the Type B liquid tank insulation system of this application has at least one of the following beneficial technical effects: 1. The protective layer covering the surface of the insulation board can protect the surface of the insulation board. The polyurethane filling between the two insulation boards can support the waterproof layer, which can reduce the occurrence of waterproof failure caused by the edge of the waterproof layer peeling off due to rainwater erosion and the weight of water accumulation. 2. The roughened area can improve the adhesion strength between the waterproof layer and the aluminum skin, reducing the occurrence of waterproof failure; 3. As a waterproof layer, polyurea can appropriately reduce the strength requirements of the crack-resistant layer in the insulation layer, reduce material costs, processing costs and construction costs, and can also delay the aging of polyurethane and resist mechanical damage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of Embodiment 1 of this application used to illustrate the protection scheme.

[0021] Figure 2 This is a schematic diagram of Embodiment 4 of this application used to illustrate the protection scheme.

[0022] Figure 3 This is a schematic diagram of Embodiment 2 of this application used to illustrate the protection scheme.

[0023] Figure 4 This is a schematic diagram of Embodiment 5 of this application used to illustrate the protection scheme.

[0024] Figure 5 This is a schematic diagram of Embodiment 3 of this application used to illustrate the protection scheme.

[0025] Figure 6 This is a schematic diagram of Embodiment 6 of this application used to illustrate the protection scheme.

[0026] Explanation of reference numerals in the attached drawings: 1. Tank body; 2. Insulating board; 3. Polyurethane; 4. Aluminum sheet; 5. Polyurea; 6. Butyl tape; 7. Low-temperature adhesive; 8. Liquid butyl; 9. Glass wool; 10. Aluminum foil tape; 11. Polystyrene block. Detailed Implementation

[0027] The following combination Figures 1-6 This application will be described in further detail.

[0028] Example 1 This application discloses a type B liquid tank insulation system. The waterproofing solution in this embodiment is suitable for situations where outdoor storage time is short, rainfall is low, and there are no supports / hanging brackets / other obstructions between the two insulation boards 2. (Refer to...) Figure 1 It is set between two adjacent insulating plates 2 on the surface of the tank body 1. The surface of both insulating plates 2 is covered with a protective layer, and polyurethane 3 is filled between the two insulating plates 2. A waterproof layer is provided on the surface of the polyurethane 3. The waterproof layer covers the outside of the joint between the polyurethane 3 and the protective layer and is bonded to the surface of the two protective layers.

[0029] In this embodiment, the protective layer is made of aluminum sheet 4, and the surface of the aluminum sheet 4 near the polyurethane 3 is roughened by grinding. The roughened area can increase the bonding strength between the waterproof layer and the aluminum sheet 4.

[0030] The waterproof layer is a polyurea 5 layer with a thickness greater than 1 mm, which is sprayed onto the surfaces of polyurethane 3 and aluminum sheet 4 using a spray gun. In this embodiment, the top surface of polyurethane 3 is flush with the outer surface of the two insulating boards 2, and polyurea 5 is filled between polyurethane 3 and the two aluminum sheets 4.

[0031] Polyurea 5, as a waterproof layer, can appropriately reduce the strength requirements of the crack-resistant layer in the insulation layer, reduce material costs, processing costs and construction costs, and can also delay the aging of polyurethane 3 and resist mechanical damage.

[0032] Example 2 The waterproofing solution in this embodiment is suitable for outdoor storage periods of 30 to 60 days, with low rainfall, and where there are no supports / hanging brackets / other obstructions between the two insulating boards 2. (Refer to...) Figure 3 In this embodiment, the waterproof layer is made of butyl tape 6; the top surface of polyurethane 3 is flush with the outer surface of the two insulating boards 2, the top surface of polyurethane 3 is filled with low-temperature adhesive 7, the top surface of low-temperature adhesive 7 is flush with the outer surface of the two aluminum sheets 4, and the low-temperature adhesive 7 is filled between butyl tape 6 and polyurethane 3.

[0033] The low-temperature adhesive 7 and the aluminum sheet 4 form a liquid seal to prevent the entry of external liquids. The butyl tape 6 is pasted on the surface to form mechanical protection and prevent the adhesive from aging. At the same time, the butyl tape 6 can prevent most of the moisture from entering.

[0034] Example 3 The waterproofing solution in this embodiment is suitable for outdoor storage for more than 60 days, with heavy rainfall, and where there are no supports / hanging brackets / other obstructions between the two insulating boards 2. (Refer to...) Figure 5 In this embodiment, the waterproof layer is made of butyl tape 6; the top surface of polyurethane 3 is flush with the outer surface of the two insulating boards 2, the top surface of polyurethane 3 is filled with low-temperature adhesive 7, and the top surface of low-temperature adhesive 7 is lower than the outer surface of aluminum sheet 4; the joints between the low-temperature adhesive 7 and aluminum sheet 4 are filled with liquid butyl 8, and butyl tape 6 covers the surface of low-temperature adhesive 7, liquid butyl 8 and aluminum sheet 4.

[0035] Low-temperature adhesive 7 can enhance the bonding strength between butyl tape 6 and the surface of polyurethane 3. Due to on-site dust and pits on the surface of aluminum sheet 4, it is impossible to achieve 100% adhesion between butyl tape 6 and aluminum sheet 4. Liquid butyl 8 can improve the bonding strength between butyl tape 6 and aluminum sheet 4. Liquid butyl 8 is easy to deform and does not harden over time. When applying butyl tape 6, the height difference between polyurethane 3 and aluminum sheet 4 can be sealed, sealing the only water inlet, thereby achieving the long-term liquid tightness requirement.

[0036] Example 4 The waterproofing solution in this embodiment is suitable for situations where outdoor storage time is short, rainfall is low, and there are supports / hanging brackets / other obstructions between the two insulating boards 2. (Refer to...) Figure 2 In this embodiment, glass wool 9 is laid between the insulating board 2 and the surface of the tank 1. The glass wool 9 can prevent polyurethane 3 from entering the channel, which facilitates subsequent inspection of whether the insulation protection has failed.

[0037] Aluminum foil tape 10 is pre-attached to the surface of the insulation board 2 at a distance of 50mm or less. Aluminum foil tape 10 is waterproof and facilitates the removal of subsequent protective materials, thus protecting the main insulation. The remaining areas are covered with polyurethane 3 bonded to the aluminum foil, providing both basic waterproofing and mechanical protection.

[0038] Example 5 The waterproofing solution in this embodiment is suitable for outdoor storage periods of 30 to 60 days, with low rainfall, and where there are supports / hanging brackets / other obstructions between the two insulating boards 2. (Refer to...) Figure 4 In this embodiment, glass wool 9 is placed between the insulating board 2 and the can. Glass wool 9 can prevent polyurethane 3 from entering the channel, which facilitates subsequent inspection of whether the insulation protection has failed.

[0039] Polyurethane 3 is filled at the joint between the side of the insulating board 2 and the surface of the tank 1. A layer of low-temperature adhesive 7 is thickly coated on the side wall of the insulating board 2 and the surface of the polyurethane 3 for waterproofing. It is required that any insulating surface be covered by low-temperature adhesive 7, and a layer of butyl tape 6 is pasted on the surface of the low-temperature adhesive 7. The butyl tape 6 extends to the top surface of the insulating board 2 and the surface of the tank 1. The butyl tape 6 serves to prevent splashing and mechanical damage.

[0040] Example 6 The waterproofing solution in this embodiment is suitable for outdoor storage for more than 60 days, with heavy rainfall, and where there are no supports / hanging brackets / other obstructions between the two insulating boards 2. (Refer to...) Figure 6 In this embodiment, all the steps in embodiment 4 are completed first, and an additional layer of polyurea 5 coating with a thickness greater than 2 mm is applied to the surface of polyurethane 3, requiring that the coating surface has no through holes.

[0041] Polystyrene blocks are filled between the two polyurea 5 and polyurethane 3 blocks to fill the depressions, prevent water accumulation, and facilitate subsequent removal. A small amount of polyurethane 3 is sprayed onto the surface of the polystyrene block 11, and the surface of the polyurethane 3 is covered with polyurea 5, forming a double protection.

[0042] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A type B liquid tank insulation system, disposed between two adjacent insulating plates (2) on the surface of the tank body (1), characterized in that, The surfaces of the two insulating boards (2) are covered with a protective layer, and polyurethane (3) is filled between the two insulating boards (2). A waterproof layer is provided on the surface of the polyurethane (3). The waterproof layer covers the outside of the joint between the polyurethane (3) and the protective layer and is bonded to the surface of the two protective layers.

2. The type B liquid tank insulation system according to claim 1, characterized in that, The protective layer includes an aluminum sheet (4).

3. The type B liquid tank insulation system according to claim 2, characterized in that, The outer surface of the aluminum sheet (4) near the polyurethane (3) is roughened by grinding.

4. The type B liquid tank insulation system according to claim 2, characterized in that, The waterproof layer includes a layer of polyurea (5) sprayed onto the surface of polyurethane (3) and aluminum sheet (4) by a spray gun.

5. The type B liquid tank insulation system according to claim 4, characterized in that, The top surface of the polyurethane (3) is flush with the outer surface of the two insulating plates (2), and polyurea (5) is filled between the top surface of the polyurethane (3) and the two insulating plates (2).

6. The type B liquid tank insulation system according to claim 2, characterized in that, The waterproof layer includes butyl tape (6), the top surface of the polyurethane (3) is flush with the outer surface of the two insulating boards (2), the top surface of the polyurethane (3) is filled with low-temperature adhesive (7), the top surface of the low-temperature adhesive (7) is flush with the outer surface of the two aluminum sheets (4), and the low-temperature adhesive (7) is filled between the butyl tape (6) and the polyurethane (3).

7. The type B liquid tank insulation system according to claim 2, characterized in that, The waterproof layer includes butyl tape (6), the top surface of the polyurethane (3) is flush with the outer surface of the two insulating boards (2), the top surface of the polyurethane (3) is filled with low-temperature adhesive (7), the top surface of the low-temperature adhesive (7) is lower than the outer surface of the aluminum sheet (4); the joints between the low-temperature adhesive (7) and the aluminum sheet (4) are filled with liquid butyl (8), and the butyl tape (6) covers the surface of the low-temperature adhesive (7), the liquid butyl (8) and the aluminum sheet (4).

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