Swing stopping bulkhead of storage tank for liquefied gas transport ship

Abstract

The utility model discloses a swing stopping bulkhead of a storage tank for a liquefied gas transport ship. The swing stopping bulkhead comprises two webs, a panel, a permeable pore plate and a plurality of horizontal reinforcing rib plates. The two web plates are fixed on the inner wall surface of the storage tank at intervals; the panel is connected between the inner diameter surfaces of the two web plates; the permeable pore plate is fixed on the inner diameter surface of the front part of the panel; the upper part and the lower part of the water-permeable pore plate are respectively provided with an upper inferior-arc-shaped water-permeable pore and a lower inferior-arc-shaped water-permeable pore, and a plurality of rows of circular water-permeable pores are horizontally formed between the upper inferior-arc-shaped water-permeable pore and the lower inferior-arc-shaped water-permeable pore; a plurality of horizontal reinforcing rib plates are fixed between the two web plates and are inserted into a plurality of flat through holes which are horizontally formed in the two sides of the panel in a one-to-one correspondence manner, the front side surfaces of the plurality of horizontal reinforcing rib plates are fixed on the rear surface of the permeable pore plate, and the plurality of horizontal reinforcing rib plates are positioned among the plurality of rows of circular permeable holes in a one-to-one correspondence manner. According to the utility model, the problem of fatigue failure easily caused by stress accumulation of the oscillation stopping panel can be reduced under the condition of reducing periodic impact of oscillation load.

Description

Technical Field

[0001] This utility model relates to an anti-sway bulkhead for a storage tank on a liquefied gas transport ship. Background Technology

[0002] The increasing variety of liquefied gas products in the marine transport market has created an urgent need for larger-volume designs for individual marine storage tanks. In designing these larger tanks, it is crucial to consider the cyclical nature of internal liquid sloshing and the impact loads caused by this sloshing. To reduce the sloshing impact on the tanks from different liquids, adjust the free liquid surface, and prevent resonance with the hull caused by sloshing, anti-sloshing bulkheads are necessary for large marine liquid cargo tanks, especially those containing substances denser than water. These bulkheads serve as a structural element to adjust the sloshing cycle and reduce sloshing impact loads. Commonly used anti-sloshing walls involve welding anti-sloshing panels directly to the tank body, using these panels to divide the liquid surface and absorb impacts. However, under cyclical sloshing loads, the anti-sloshing panels are prone to fatigue failure due to stress accumulation, posing a potential safety hazard. Utility Model Content

[0003] The purpose of this invention is to fill the gap in the existing technology by providing an anti-sloshing bulkhead for a liquefied gas transport ship storage tank. It can not only adjust the sloshing cycle of the liquid cargo and reduce the sloshing impact, but also reduce the potential risk of anti-sloshing bulkhead failure.

[0004] The purpose of this utility model is achieved as follows: a sway-resistant bulkhead for a liquefied gas transport ship's storage tank, comprising two web plates, a front plate, a perforated plate, and multiple horizontal reinforcing ribs; wherein:

[0005] The web plate is an annular plate with a circular inner hole, and the outer end face of the web plate is adapted to the inner wall surface of the storage tank. The two web plates are fixed to the inner wall surface of the storage tank at intervals.

[0006] The panel is a cylindrical structure and is connected between the inner diameter surfaces of two web plates. The length of the panel is greater than the distance between the two web plates.

[0007] The permeable plate is a circular plate with a diameter adapted to the inner diameter of the panel. The permeable plate is fixed to the front inner diameter surface of the panel. The upper and lower parts of the permeable plate are respectively opened with an upper arc-shaped permeable hole and a lower arc-shaped permeable hole, and multiple rows of circular permeable holes are opened horizontally between the upper arc-shaped permeable hole and the lower arc-shaped permeable hole.

[0008] Multiple horizontal reinforcing ribs are fixed between two web plates and are inserted one by one into multiple flat perforations that are opened horizontally on both sides of the panel. The front side of the multiple horizontal reinforcing ribs is fixed to the rear surface of the permeable plate, and the multiple horizontal reinforcing ribs are located one by one between multiple rows of circular permeable holes.

[0009] In the aforementioned anti-sway bulkhead of the liquefied gas transport ship storage tank, the upper and lower surfaces of each horizontal reinforcing rib are welded to the inner surfaces of the two web plates in a corresponding manner; the upper and lower surfaces of the front side of each horizontal reinforcing rib are also welded to the rear surface of the permeable plate; and each horizontal reinforcing rib is also welded to the inner diameter surface and the outer diameter surface of the panel.

[0010] The anti-sway bulkhead of the aforementioned liquefied gas transport ship storage tank has an isosceles trapezoidal groove at each end of each horizontal reinforcing rib.

[0011] The anti-sway bulkhead of the aforementioned liquefied gas transport ship storage tank has several arc-shaped vent grooves on the top outer end face of the two web plates; and several arc-shaped water permeable grooves on the bottom outer end face of each of the two web plates.

[0012] The anti-sway bulkhead of the aforementioned liquefied gas transport ship storage tank has a ladder fixed to the lower outer surface of each of the two web plates.

[0013] The anti-sway bulkhead of the liquefied gas transport ship storage tank of this utility model is characterized by:

[0014] 1) By welding two web plates to the panel, and welding the outer ends of the two web plates to the tank, an integral reinforcing structure is formed to ensure that the strength of the anti-sloshing bulkhead meets the different design pressure requirements of the tank. A perforated plate is installed at one end of the panel to adjust the overall sloshing period of the tank and mitigate the impact load of sloshing high-density liquid cargo.

[0015] 2) By welding multiple horizontal stiffening plates between the two web plates, the overall strength of the anti-sway bulkhead can be enhanced and the structural weight optimized. Furthermore, by welding the panel to the permeable plate, the sway load can be better withstood and the fatigue effect of the permeable plate caused by swaying can be reduced.

[0016] 3) The ends of the multiple horizontal reinforcing ribs are not welded to the tank. Instead, a smooth transition is made between the two web plates towards the panel. This ensures the strength of the anti-sloshing bulkhead while reducing on-site welding work and optimizing the overall design. Simultaneously, ladders for personnel access are installed at the bottom of the two web plates, and large openings are made at the bottom of the permeable plates to allow for one person to pass through the tank from front to back, as well as the flow and filling of liquid cargo. Attached Figure Description

[0017] Figure 1 This is a perspective view of the anti-sway bulkhead of the liquefied gas transport ship storage tank of this utility model.

[0018] Figure 2 This is a front view of the anti-sway bulkhead of the liquefied gas transport ship storage tank of this utility model.

[0019] Figure 3 This is a side view of the anti-sway bulkhead of the liquefied gas transport ship storage tank of this utility model.

[0020] Figure 4 yes Figure 3 View A in the diagram. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Please see Figures 1 to 4 The anti-sway bulkhead of the liquefied gas transport ship storage tank of this utility model can be made of carbon manganese steel and includes two web plates 1, a face plate 2, a perforated plate 3, multiple horizontal reinforcing ribs 4, and two ladders 5; wherein:

[0023] The web plate 1 is an annular plate with a circular inner hole, and the outer end face of the web plate 1 is adapted to the inner wall surface of the storage tank. The two web plates 1 are fixed to the inner wall surface of the storage tank at intervals. Several arc-shaped vent grooves 11 are opened on the top outer end face of the two web plates 1 to ensure the air pressure balance in the front and rear storage tank cavities of the anti-sway bulkhead. Several arc-shaped water permeable grooves 12 are opened on the bottom outer end face of the two web plates 1 to ensure that the liquid can quickly fill the bottom of the storage tank when the liquid is first injected.

[0024] The panel 2 is a cylindrical structure and its outer diameter is adapted to the inner diameter of the web 1, so that the panel 2 is connected between the inner diameter surfaces of the two webs 1. The length of the panel 2 is greater than the distance between the two webs 1.

[0025] The permeable plate 3 is a circular plate with a diameter that matches the inner diameter of the panel 2. The permeable plate 3 is fixed to the front inner diameter surface of the panel 2. The permeable plate 3 has an upper inferior arc-shaped permeable hole 31 and a lower inferior arc-shaped permeable hole 32 correspondingly opened on its upper and lower parts. The size of the upper inferior arc-shaped permeable hole 31 is smaller than the size of the lower inferior arc-shaped permeable hole 32, and the size of the lower inferior arc-shaped permeable hole 32 must ensure that people can pass through. The permeable plate 3 has multiple rows of circular permeable holes 30 horizontally opened between the upper inferior arc-shaped permeable holes 31 and the lower inferior arc-shaped permeable holes 32.

[0026] Multiple horizontal reinforcing ribs 4 are fixed between the inner surfaces of the two web plates 1 and are inserted one by one into multiple flat perforations opened horizontally on both sides of the panel 2. The front side of the multiple horizontal reinforcing ribs 4 is fixed to the rear surface of the permeable plate 3, and the multiple horizontal reinforcing ribs 4 are located one by one between multiple rows of circular permeable holes 30. Each horizontal reinforcing rib 4 has an isosceles trapezoidal groove at both ends, so that the two ends of the multiple horizontal reinforcing ribs 4 are not fixedly connected to the inner wall surface of the tank.

[0027] Two escalators 52 are fixed to the lower outer surfaces of the two web plates 1 in a one-to-one correspondence.

[0028] This utility model relates to an anti-sloshing bulkhead for a liquefied gas transport ship storage tank. Two web plates 1 serve as the supporting structure between the anti-sloshing bulkhead and the tank. The two annular web plates 1 are welded to the inner wall of the tank, and the spacing between the two web plates 1 can be adjusted according to the size of the tank. A panel 2 is welded to the two web plates 1 to form the main structure of the anti-sloshing bulkhead. Multiple horizontal reinforcing ribs 4 are welded between the web plates 1 and the panel 2, according to the size of the tank. The horizontal reinforcing ribs 4 are welded to the panel 2, the two web plates 1, and the perforated plate 3, but not to the inner wall of the tank, reducing on-site manufacturing steps. The size and number of circular perforated holes 30 on the perforated plate 3 are determined by the size of the tank. Each horizontal reinforcing rib 4 has its upper and lower surfaces on both sides welded to the inner surfaces of the two web plates 1; each horizontal reinforcing rib 4 also has its upper and lower surfaces on one side welded to one surface of the permeable plate 3; and each horizontal reinforcing rib 3 also has its inner and outer diameter surfaces of the panel 2 welded together, which can better reduce the swaying cycle and swaying impact load.

[0029] The results were verified using the finite element method. Under the same tank size and the same impact load, the anti-sloshing bulkhead of this invention can reduce the stress to 10% of the original design while reducing the weight by 30% compared to the traditional anti-sloshing bulkhead.

[0030] The anti-sloshing tank wall of this utility model has a simple structure, high strength, and light weight. It can reduce the sloshing period and sloshing impact load, reduce the risk of anti-sloshing tank wall failure, avoid damage to the tank structure, and reduce the impact and frequency resonance of liquid sloshing. At the same time, it adopts horizontal reinforcing ribs 4 that are not welded to the tank and two independent web plates 1, making the overall structure more convenient and flexible. It can be applied to tanks of different lengths and diameters and different types to reduce structural weight and sloshing load impact.

[0031] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A sway-resistant bulkhead for a liquefied gas transport ship's storage tank, comprising two web plates, a face plate, a perforated plate, and multiple horizontal reinforcing ribs; characterized in that: The web plate is an annular plate with a circular inner hole, and the outer end face of the web plate is adapted to the inner wall surface of the storage tank. The two web plates are fixed to the inner wall surface of the storage tank at intervals. The panel is a cylindrical structure and is connected between the inner diameter surfaces of two web plates. The length of the panel is greater than the distance between the two web plates. The permeable plate is a circular plate with a diameter adapted to the inner diameter of the panel. The permeable plate is fixed to the front inner diameter surface of the panel. The upper and lower parts of the permeable plate are respectively opened with an upper arc-shaped permeable hole and a lower arc-shaped permeable hole, and multiple rows of circular permeable holes are opened horizontally between the upper arc-shaped permeable hole and the lower arc-shaped permeable hole. Multiple horizontal reinforcing ribs are fixed between two web plates and are inserted one by one into multiple flat perforations that are opened horizontally on both sides of the panel. The front side of the multiple horizontal reinforcing ribs is fixed to the rear surface of the permeable plate, and the multiple horizontal reinforcing ribs are located one by one between multiple rows of circular permeable holes.

2. The anti-sway bulkhead of the liquefied gas transport ship storage tank according to claim 1, characterized in that, Each horizontal reinforcing rib has its upper and lower surfaces on both sides welded to the inner surfaces of the two web plates; the upper and lower surfaces on the front side of each horizontal reinforcing rib are also welded to the rear surface of the permeable plate; and each horizontal reinforcing rib is also welded to the inner and outer diameter surfaces of the panel.

3. The anti-sloshing bulkhead of the liquefied gas transport ship storage tank according to claim 1 or 2, characterized in that, Each horizontal reinforcing rib has an isosceles trapezoidal groove at both ends.

4. The anti-sway bulkhead of the liquefied gas transport ship storage tank according to claim 1, characterized in that, Several arc-shaped ventilation grooves are opened on the top outer end face of the two web plates; several arc-shaped water permeable grooves are opened on the bottom outer end face of the two web plates respectively.

5. The anti-sloshing bulkhead of the liquefied gas transport ship storage tank according to claim 1 or 4, characterized in that, A ladder is fixed to the lower outer surface of each of the two web plates.

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