Pump well structure for b-type lng tank and ship having b-type lng tank

Abstract

The application relates to a pump well structure for a B-type LNG cabin and a ship with the B-type LNG cabin, which comprises a pump well surrounding wall, a pump well bottom plate, a pump well edge reverse surface reinforcing rib, a reinforcing plate and a pump well middle embedded plate; the bottom of the B-type LNG cabin is provided with a B-type cabin bottom plate, the B-type cabin bottom plate is provided with a pump well opening, the pump well surrounding wall is arranged below the B-type cabin bottom plate along the pump well opening, and the pump well bottom plate is enclosed at the lower end of the pump well surrounding wall to form a pump well main body; the pump well main body is in a long waist circle type along the ship width direction; the pump well edge reverse surface reinforcing rib is arranged above the B-type cabin bottom plate along the pump well wellhead; the reinforcing plate is arranged in a position corresponding to the position of the pump well middle embedded plate in the included angle region between the pump well surrounding wall and the B-type cabin bottom plate; and the pump well middle embedded plate is embedded into the pump well main body. The pump well structure adopts the long waist circle type design, can effectively avoid the sharp corners formed by the pump well main body, the B-type cabin bottom plate and the pump well bottom plate, avoids stress concentration at the sharp corners, and ensures the tightness of the whole pump well region structure.

Description

Technical Field

[0001] This invention relates to the field of ship design, and more specifically to a pump well structure for a Type B LNG tank and a ship having a Type B LNG tank. Background Technology

[0002] Type B tanks are generally suitable for all types of liquefied gas carriers. Compared with other types of liquid cargo tanks, they have advantages such as high capacity utilization, anti-swaying, and safety and reliability under the same ship size, making them very suitable for small and medium-sized LNG carriers.

[0003] Currently, there is a trend towards larger B-type tank capacity in the market. As the size of B-type tanks increases, the specifications, size, and weight of deep well pumps or submersible pumps used for loading and unloading liquid cargo also become larger. The base supporting the pump body also becomes larger, and the collection requirements during liquid cargo unloading are also higher. However, the space where the pump well is located is usually not more spacious due to various factors such as the bottom structure of the B-type tank and the need to align it with the dome above. It still needs to be arranged in a relatively limited and fixed space, which brings new changes and challenges to the structural design of the pump well and its surroundings. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a pump well structure for a Type B LNG tank and a ship with a Type B LNG tank. The structure adopts a long oval main structure design, which can accommodate Type B tanks with larger capacities and high-power submersible pumps in terms of strength and fatigue resistance. It can also provide sufficient strength and space to arrange the base for connecting large submersible pumps, and the liquid cargo collection efficiency is also relatively high.

[0005] The technical objective of this invention is achieved through the following technical solution:

[0006] A pump well structure for a Type B LNG tank is provided, located in the central area of ​​the bottom of the Type B tank near the stern. The structure includes a pump well confining wall, a pump well bottom plate, reinforcing ribs on the reverse side of the pump well edge, a reinforcing plate, and a central embedded plate. The bottom of the Type B LNG tank has a Type B tank bottom plate with a pump well opening. The pump well confining wall is arranged around the pump well opening below the Type B tank bottom plate, and the pump well bottom plate surrounds the lower end of the confining wall to form the pump well body. The pump well body is elongated oval in shape along the width of the ship. Reinforcing ribs on the reverse side of the pump well edge are arranged above the Type B tank bottom plate along the pump well opening. The reinforcing plate is located in the angled area between the pump well confining wall and the Type B tank bottom plate, and its position corresponds to the central embedded plate. The central embedded plate is embedded within the pump well body.

[0007] Furthermore, the edge of the pump well bottom plate extends outward relative to the pump well enclosure wall; the bottom plate of the type B compartment at the pump well opening extends inward relative to the pump well enclosure wall.

[0008] Furthermore, the central embedded plate of the pump well is set in the middle of the pump well body along the length of the ship. The central embedded plate of the pump well has through holes that connect the two sides of the pump well body. The central embedded plate of the pump well also has water flow holes near the bottom plate of the pump well.

[0009] Furthermore, the pump well embedding plate includes a first embedding plate and a second embedding plate arranged opposite to each other. The first embedding plate and the second embedding plate each have an open half hole, and the two half holes are joined together to form a through hole.

[0010] Furthermore, the first and second embedded plates are respectively provided with L-shaped mounting parts corresponding to the edge of the pump wellhead.

[0011] Furthermore, the upper part of the B-type bottom plate is also provided with a central longitudinal anti-sway bulkhead perpendicular to the B-type bottom plate, and the upper part of the pump well is embedded in the central longitudinal anti-sway bulkhead; the reverse reinforcing rib of the pump well edge is set perpendicular to the central longitudinal anti-sway bulkhead, and the end of the reverse reinforcing rib of the pump well edge extends to the position of the central longitudinal anti-sway bulkhead and is connected and fixed to the central longitudinal anti-sway bulkhead.

[0012] Furthermore, several B-type hull longitudinal ribs are provided above the B-type hull floor plate along the direction perpendicular to the reverse reinforcing rib of the pump well edge; at the position of the reverse reinforcing rib of the pump well edge, the end of the B-type hull longitudinal rib extends to the reverse reinforcing rib of the pump well edge and is connected and fixed to the reverse reinforcing rib of the pump well edge.

[0013] Furthermore, water flow holes are provided on the area between the longitudinal ribs of the B-type hull bottom on the reinforcing ribs on the reverse side of the pump well edge to prevent the accumulation of liquid in closed dead corners.

[0014] Furthermore, a longitudinal stiffener is provided on one side of the central longitudinal anti-sway bulkhead along a direction perpendicular to the reverse reinforcing rib of the pump well edge; the longitudinal stiffener is connected to the end of the reverse reinforcing rib of the pump well edge located on the same side of the central longitudinal anti-sway bulkhead.

[0015] Furthermore, the present invention also provides a ship having a Type B LNG tank, the Type B LNG tank being provided with the aforementioned pump well structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The pump well structure of the present invention for the B-type LNG tank adopts an elongated oval design, which can effectively avoid the sharp corners formed by the three-sided intersection with the bottom plate of the B-type tank or the bottom plate of the pump well. This effectively avoids stress concentration at the sharp corners, and can better ensure the airtightness of the entire pump well area structure and improve its service life.

[0018] 2. In the pump well structure for a type B LNG tank of the present invention, the edge of the pump well bottom plate extends outward relative to the pump well enclosure wall; the pump well opening extends inward relative to the pump well enclosure wall. In this way, at the edge tongue and groove position, it can be ensured that the pump well enclosure wall and the pump well bottom plate, as well as the pump well enclosure wall and the type B tank bottom plate, can be fully penetrated welded to ensure welding quality and tightness, and can also increase its fatigue strength.

[0019] 3. The embedded plate in the middle of the pump well can provide support for the pump well structure, and together with the reinforcing plate, it can effectively strengthen the pump well wall.

[0020] 4. The structure formed by the reinforcing ribs on the reverse side of the pump well edge and the longitudinal ribs of the B-type tank bottom plate can serve as the base support structure for the large main liquid cargo pump. Smaller gas pumps and spray pump bases can be directly installed inside the pump well body. Attached Figure Description

[0021] Figure 1 This is a top view of the pump well at the bottom of the Type B LNG tank in this invention.

[0022] Figure 2 yes Figure 1 AA view in the middle.

[0023] Figure 3 yes Figure 2 A1-A1 view in the image.

[0024] Figure 4 yes Figure 1 BB view in the middle.

[0025] Figure 5 yes Figure 1 The CC view in the middle.

[0026] Figure 6 yes Figure 5 The VIEW E magnified view in the program.

[0027] In the figure, 1. Type B bottom plate; 2. Type B bottom longitudinal rib; 3. Central longitudinal anti-sway bulkhead; 4. Anti-sway bulkhead longitudinal rib; 5. Pump well edge reverse reinforcing rib; 6. Pump well enclosure; 7. Pump well bottom plate; 8. Reinforcing plate; 9. Pump well center embedded plate; 10. Water flow hole; 11. Through hole; 12. First embedded plate; 13. Second embedded plate; 14. L-shaped mounting section. Detailed Implementation

[0028] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0029] A pump well structure for a Type B LNG tank, such as Figure 1-6As shown, the pump well structure is located in the central area of ​​the bottom of the Type B LNG tank near the stern, including a pump well confining wall 6, a pump well bottom plate 7, a pump well edge reinforcing rib 5, a reinforcing plate 8, and a pump well center embedded plate 9. The bottom of the Type B LNG tank is provided with a Type B tank bottom plate 1, on which a pump well opening is provided. The pump well confining wall 6 is arranged around the pump well opening below the Type B tank bottom plate 1, and the pump well bottom plate 7 surrounds the lower end of the pump well confining wall 6 to form the pump well body. The pump well body is elongated oval in the width direction of the ship. The pump well edge reinforcing rib 5 is arranged above the Type B tank bottom plate 1 along the pump well opening, and the length of the pump well edge reinforcing rib 5 is greater than the length of the pump well in the width direction of the ship, aligning with the pump well confining wall 6 from the reverse side. The reinforcing plate 8 is located in the angled area between the pump well confining wall 6 and the Type B tank bottom plate 1, and the position of the reinforcing plate 8 corresponds to that of the pump well center embedded plate 9. The pump well center embedded plate 9 is embedded in the pump well body.

[0030] Preferably, the edge of the pump well bottom plate 7 extends outward relative to the pump well enclosure 6; the bottom plate of the B-type compartment at the pump well opening extends inward relative to the pump well enclosure 6. At the edge tongue and groove position, it can be ensured that the pump well enclosure 6 and the pump well bottom plate 7, as well as the pump well enclosure 6 and the B-type compartment bottom plate 1, can be fully penetrated welded to ensure welding quality and tightness, and can also increase its fatigue strength.

[0031] A central embedded plate 9 is positioned along the length of the ship at the center of the pump well body. The central embedded plate 9 has through holes 11 connecting the two sides of the pump well body. A water flow hole 10 is also provided on the central embedded plate 9 near the bottom plate of the pump well, facilitating the removal of liquid cargo from the pump well as thoroughly as possible. Specifically, the pump well embedded plate 9 includes a first embedded plate 12 and a second embedded plate 13 arranged opposite each other. Each of the first embedded plate 12 and the second embedded plate 13 has an open half-hole, which together form a through hole 11. The through hole 11 is a square hole with rounded corners to facilitate the flow of liquid cargo. The first embedded plate 12 and the second embedded plate 13 each have an L-shaped mounting part 14 corresponding to the edge of the pump well opening. The reinforcing plate 8 and the central embedded plate 9 reinforce both sides of the pump well enclosure 6. Preferably, the reinforcing plate 8 is a triangular reinforcing plate.

[0032] A longitudinal anti-sway bulkhead 3 is also provided perpendicular to the upper part of the B-type bottom plate, and the upper end of the pump well embedded plate 9 is embedded in the longitudinal anti-sway bulkhead 3. The pump well edge reverse reinforcing rib 5 is provided perpendicular to the longitudinal anti-sway bulkhead 3, and the end of the pump well edge reverse reinforcing rib 5 extends to the position of the longitudinal anti-sway bulkhead 3 and is connected and fixed to the longitudinal anti-sway bulkhead 3. Preferably, the pump well edge reverse reinforcing rib 5 has a toe end structure at one end near the longitudinal anti-sway bulkhead 3, and is connected and fixed to the longitudinal anti-sway bulkhead 3 through the toe end structure.

[0033] Several B-type bottom longitudinal ribs 2 are provided above the B-type bottom plate 1 along a direction perpendicular to the reverse reinforcing rib 5 of the pump well edge. At the position of the reverse reinforcing rib 5 of the pump well edge, the end of the B-type bottom longitudinal rib 2 extends to the reverse reinforcing rib 5 of the pump well edge and is connected and fixed to the reverse reinforcing rib 5 of the pump well edge. The end of the reverse reinforcing rib 5 of the pump well edge away from the central longitudinal anti-sway bulkhead 3 abuts against a B-type bottom longitudinal rib 2. On one side of the central longitudinal anti-sway bulkhead 3, along a direction perpendicular to the reverse reinforcing rib 5 of the pump well edge, an anti-sway bulkhead longitudinal rib 4 is also provided. The anti-sway bulkhead longitudinal rib 4 is connected to the end of the reverse reinforcing rib 5 of the pump well edge located on the same side of the central longitudinal anti-sway bulkhead 3, which facilitates the effective transmission of the force of the reverse reinforcing rib of the pump well edge to the strong member central longitudinal anti-sway bulkhead. Preferably, a drainage hole 10 is also provided on the reverse reinforcing rib 5 of the pump well edge in the area between the B-type bottom longitudinal ribs 2 to avoid the formation of closed dead corners for liquid accumulation.

[0034] This embodiment also provides a ship with a Type B LNG tank, which includes a Type B LNG tank and a pump well structure, the pump well structure being the same as the pump well structure in the above embodiment.

[0035] The installation process of the pump well structure of the Type B LNG tank in this invention is roughly as follows:

[0036] First, an elongated oval pump well opening is CNC-cut on the B-type bottom plate 1. Similarly, an opening is pre-cut on the central longitudinal anti-sway bulkhead 3 to accommodate the embedded plate 9 in the middle of the pump well. The B-type bottom longitudinal rib 2, within the length range of the pump well opening, is cut off at the edge of the pump well to leave a gap for installing the reinforcing rib 5 on the reverse side of the pump well edge.

[0037] Then, the pump well bottom plate 7 is cut and fabricated, and the pump well enclosure 6 is installed on it at the corresponding position. The pump well enclosure 6 is composed of four segments: two semicircular sections and two long straight sections. The fabricated pump well slot is then installed and welded to the corresponding position below the edge of the pump well opening.

[0038] Next, the pump well center embedded plate 9 is installed. In order to install it into the pump well groove and the central longitudinal anti-sway chamber 3, the pump well center embedded plate 9 is divided into a first embedded plate and a second embedded plate cut along the center of the large hole on it. A certain gap is reserved at the joint of the first embedded plate and the second embedded plate to facilitate splicing and butt welding.

[0039] Then, install the pump well edge reinforcing rib 5 at the designated position above the large opening edge of the pump well, ensuring that it is aligned with the long side of the pump well confining wall 6 from the reverse side. One end of the rib is welded to the continuous B-type bottom longitudinal rib 2 closest to the pump well opening, and the other end is welded to the central longitudinal anti-sway bulkhead 3 and the pump well central embedded plate 9. Finally, install and weld two triangular plates 8 to the outside of the pump well confining wall 6 and below the B-type bottom plate, aligning their reverse sides with the pump well central embedded plate 9.

[0040] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A pump well structure for a type B LNG tank, characterized in that, The pump well structure is located in the central area of ​​the bottom of the Type B LNG tank near the stern, and includes a pump well confining wall, a pump well bottom plate, reinforcing ribs on the reverse side of the pump well edge, a reinforcing plate, and a central embedded plate. The bottom of the Type B LNG tank is provided with a Type B tank bottom plate, on which a pump well opening is provided. The pump well confining wall is arranged around the pump well opening below the Type B tank bottom plate, and the pump well bottom plate surrounds the lower end of the pump well confining wall to form the pump well body. The pump well body is elongated oval in the width direction of the ship. The reinforcing ribs on the reverse side of the pump well edge are arranged above the Type B tank bottom plate along the pump well opening. The reinforcing plate is located in the angled area between the pump well confining wall and the Type B tank bottom plate, and the position of the reinforcing plate corresponds to that of the central embedded plate. The central embedded plate is embedded in the pump well body.

2. The pump well structure for a type B LNG tank according to claim 1, characterized in that, The edge of the pump well bottom plate extends outward relative to the pump well enclosure wall; the bottom plate of the type B compartment at the pump well opening extends inward relative to the pump well enclosure wall.

3. The pump well structure for a type B LNG tank according to claim 2, characterized in that, The central embedded plate of the pump well is set in the middle of the pump well body along the length of the ship. The central embedded plate of the pump well has through holes that connect the two sides of the pump well body. The central embedded plate of the pump well also has water flow holes near the bottom plate of the pump well.

4. The pump well structure for a type B LNG tank according to claim 3, characterized in that, The embedded plate in the middle of the pump well includes a first embedded plate and a second embedded plate arranged opposite to each other. The first embedded plate and the second embedded plate each have an open half hole, and the two half holes are joined together to form a through hole.

5. The pump well structure for a type B LNG tank according to claim 4, characterized in that, The first and second embedded plates are respectively provided with L-shaped mounting parts corresponding to the edge of the pump wellhead.

6. The pump well structure for a type B LNG tank according to claim 1, characterized in that, The upper end of the B-type bottom plate is perpendicular to the B-type bottom plate and is also provided with a central longitudinal anti-sway block. The upper end of the pump well embedded in the middle plate is embedded in the central longitudinal anti-sway block. The reverse reinforcing rib of the pump well edge is set perpendicular to the central longitudinal anti-sway block, and the end of the reverse reinforcing rib of the pump well edge extends to the position of the central longitudinal anti-sway block and is connected and fixed to the central longitudinal anti-sway block.

7. The pump well structure for a type B LNG tank according to claim 6, characterized in that, Several B-type hull longitudinal ribs are provided above the B-type hull bottom plate along the direction perpendicular to the reverse reinforcing rib of the pump well edge; at the position of the reverse reinforcing rib of the pump well edge, the end of the B-type hull bottom longitudinal rib extends to the reverse reinforcing rib of the pump well edge and is connected and fixed to the reverse reinforcing rib of the pump well edge.

8. The pump well structure for a type B LNG tank according to claim 7, characterized in that, The area on the reverse side of the pump well edge, corresponding to the longitudinal ribs of the B-type hull bottom, is also provided with water flow holes.

9. The pump well structure for a type B LNG tank according to claim 6, characterized in that, One side of the central longitudinal anti-sway block is also provided with an anti-sway block longitudinal bone in a direction perpendicular to the reverse reinforcing rib of the pump well edge; the anti-sway block longitudinal bone is connected to the end of the reverse reinforcing rib of the pump well edge located on the same side of the central longitudinal anti-sway block.

10. A ship with a Type B LNG tank, characterized in that, Includes a Type B LNG tank, wherein the Type B LNG tank is equipped with a pump well structure as described in any one of claims 1-9.

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