A new type of continuous C-shaped storage tank liquid dome for a housing

Abstract

A novel continuous C-type storage tank liquid dome for a shell. The C-type storage tank is located below the deck, and a liquid dome is provided at the top of the C-type storage tank. The liquid dome is divided into upper and lower sections. The diameter of the upper section of the liquid dome is smaller than that of the lower section. The upper section of the liquid dome and the lower section of the liquid dome are connected into one body through a middle section bulkhead. The top of the upper section of the liquid dome is sealed with a top plate, and the bottom of the lower section of the liquid dome is sealed with a bottom plate. The edge of the bottom plate is connected to the bulkhead of the C-type storage tank into one body. A plurality of through-tank openings are opened on the bottom plate, and multiple sections of through-tank pipe systems extend upward through the through-tank openings, penetrate through the top plate to above the deck, and the through-tank pipe systems are welded and fixed to the bottom plate. The present invention can keep the outer shell of the storage tank as an airtight space, form the main pressure-bearing structure of the pressure vessel, and form a secondary protection space inside the novel liquid dome structure. In this way, while meeting the operating conditions of the liquid cargo system and the piping layout requirements, the size of the opening of the storage tank can be reduced, thereby reducing the structural stress here, improving the structural safety and the designability of the storage tank structure, and being more convenient for construction.

Description

Technical Field

[0001] The present invention belongs to the field of shipbuilding and design, and particularly relates to a novel continuous C-shaped storage tank liquid dome for a hull. Background Art

[0002] When a C-shaped independent storage tank is used as a liquid cargo tank or a deck storage tank on a ship, various pipe systems for entering and leaving the storage tank need to be arranged to achieve loading and unloading operations. For example, Figure 1 As shown, the current solutions are all to open large through-holes on the outer surface of the storage tank, on which a cylindrical liquid dome is provided, and various pipe system openings are opened on the liquid dome top cap for the pipe systems to pass through. The liquid dome enclosure wall and the storage tank together form a sealed storage tank space.

[0003] In this solution, due to the structural discontinuity at the connection between the perimeter of the liquid dome and the outer shell of the storage tank, this area becomes the region with the highest stress in the entire liquid cargo tank. In the area where the liquid dome is opened, an additional ring of thickened plates or doubler plates needs to be provided on the outer shell of the storage tank. Moreover, due to the characteristics of the spatial curved surface in the connection area between the thickened plates or the thickened plates and the storage tank and the liquid dome, the welding process is relatively complex and the construction difficulty is great.

[0004] The setting of various pipe systems needs to meet the operation requirements of the liquid cargo system, including pipe diameter, number, type, etc. To meet the layout requirements between various pipe systems, a relatively large liquid dome top space is often required, resulting in relatively large openings opened in the area where the storage tank contacts the liquid dome, and the stress is more concentrated, which becomes one of the key factors restricting the design of the storage tank.

[0005] To reduce the stress level in this area, it is necessary to reduce the size of the liquid dome. For this purpose, the pipe systems need to maintain the minimum spacing requirements as much as possible during layout, which increases a certain difficulty for the layout after the pipe systems extend into the storage tank. Summary of the Invention

[0006] To solve the above problems, the present invention provides a novel continuous C-shaped storage tank liquid dome for a hull, and the technical solution adopted is as follows:

[0007] A novel continuous C-shaped storage tank liquid dome for a hull, where the C-shaped storage tank is located below the deck, a liquid dome is provided at the top of the C-shaped storage tank, and the top end of the liquid dome extends upward through the deck.

[0008] The liquid dome is divided into upper and lower sections. The diameter of the upper section of the liquid dome is smaller than that of the lower section of the liquid dome. The upper section of the liquid dome and the lower section of the liquid dome are connected into one body through a middle section enclosure wall. The upper section of the liquid dome and the lower section of the liquid dome are internally connected and communicated. The top of the upper section of the liquid dome is sealed with a top plate, and the bottom of the lower section of the liquid dome is sealed with a bottom plate. The edge of the bottom plate is connected to the cabin wall of the C-shaped storage tank to form an integral body.

[0009] A plurality of through-cabin openings are opened on the bottom plate, and multiple sections of through-cabin pipe systems extend upward through the through-cabin openings, penetrate the top plate to above the deck, and the through-cabin pipe systems are welded and fixed to the bottom plate.

[0010] A stairway is provided between the top plate and the bottom plate. The bottom of the stairway is fixed to the bottom plate, and the top extends upward through the top plate. A first manhole cover is provided at the top of the stairway, a manhole is opened on the bottom plate, and a second manhole cover is provided on the manhole.

[0011] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, the height H1 of the upper liquid dome passing through the deck is 500 mm to 800 mm.

[0012] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, the lower liquid dome is formed into a frustum shape by the lower enclosing plate. The lower enclosing plate forms an angle α with the bottom plate. The upper liquid dome is formed into a cylindrical shape by the upper enclosing plate. The upper enclosing plate is connected to the lower enclosing plate through the middle enclosing plate, and the middle enclosing plate forms an angle β with the horizontal plane.

[0013] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, the through-hull piping system consists of three sections. The section passing through the bottom plate is the first through-hull section, the section passing through the top plate is the third through-hull section, and the section located between the bottom plate and the top plate is the second through-hull section. The first through-hull section and the third through-hull section are straight pipes, and the second through-hull section is an S-shaped pipe.

[0014] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, a CH monitor is provided inside the liquid dome.

[0015] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, the size of the through-hull opening is adapted to the thickness of the through-hull piping system.

[0016] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, the first manhole cover and the second manhole cover are airtight manhole covers.

[0017] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, the diameter of adjacent through-hull openings is not less than 200 mm.

[0018] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, the range of the angle α is [70°, 90°], and the range of the angle β is [0°, 30°].

[0019] For the above-mentioned novel continuous C-shaped storage tank liquid dome of the shell, further, the height L1 of the first through-hull section extending out of the bottom plate is 300 to 500 mm, and the height L3 of the third through-hull section extending out of the top plate is not less than 150 mm.

[0020] The beneficial effects of the present invention are:

[0021] 1 By directly opening various small holes on the surface of the storage tank, welding is used between each small hole at the surface of the storage tank and the outer shell of the storage tank, and the manhole cover adopts an airtight form, so that the outer shell surface of the storage tank can be maintained as a complete pressure vessel structure. Compared with the conventional design, the high stress in the junction area between the storage tank and the liquid dome when directly opening an extra-large hole on the surface of the storage tank is greatly reduced, and the structural safety is improved;

[0022] 2 The newly added enclosing plate at the bottom section of the liquid dome can strengthen the storage tank structure in the small opening area. The design of small holes with a certain distance interval and the design of the newly added liquid dome enclosing plate can greatly reduce the plate thickness of the locally thickened plate at the junction between the storage tank and the liquid dome, and even the locally thickened plate or double plate in this area can be cancelled, making the structure here no longer the key factor restricting the storage tank design, and improving the flexibility of the storage tank design;

[0023] 3 The newly added liquid dome enclosing plate is divided into three parts: the bottom section, the middle section and the top section, which can better adapt to the layout requirements of each pipe system with a large distance at the storage tank end and a close spacing at the outlet of the liquid dome roof, and is convenient for each pipe system to adjust the bending path inside the liquid dome structure;

[0024] 4 The newly added liquid dome enclosing plate is divided into three parts: the bottom section, the middle section and the top section. The topmost part adopts a dense pipe system layout with a smaller enclosing plate diameter. For the liquid cargo tank structure that needs to pass through the deck surface, the hull opening can be reduced at the place where it passes through the deck, thereby improving the longitudinal continuity of the hull structure and the structural safety;

[0025] 5 The newly added bottom section liquid dome enclosing plate is designed as a frustum-shaped regular trapezoid structure, which can better transition with the tank body. The top section enclosing plate is designed as a cylindrical structure, and the corresponding hull deck opening is also circular. This design can make full use of the advantages of circular structure design and avoid additional stress concentration due to geometric discontinuity at the connection of the storage tank and the deck opening;

[0026] 6 The middle section enclosing plate and the bottom section enclosing plate adopt an outward expansion design form, so that the opening spacing of each pipe system on the surface of the storage tank structure can be appropriately widened, taking into account the layout requirements of the pipe system and equipment after extending into the storage tank to a certain extent, and facilitating the optimization of the pipeline layout inside the storage tank;

[0027] 7 The small openings on the surface of the storage tank of the present invention and the manhole cover are in a closed design with the outer shell of the storage tank, so that the danger level in the space formed by the outer shell of the storage tank and the liquid dome enclosing plate is reduced, providing a double guarantee for liquid leakage. That is, once liquid leakage occurs, it will first leak into this liquid dome space and be detected by the CH detector arranged in this space, reminding the crew to perform relevant operations in time, and will not affect the hull deck structure, thus greatly improving the system safety. Brief Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the existing liquid dome structure;

[0029] Figure 2 is a schematic structural view of the novel liquid dome of the present invention;

[0030] Figure 3 is Figure 2 the schematic structural view from the B-B perspective in

[0031] Figure 4 is a schematic structural view of the C-type storage tank with a novel liquid dome;

[0032] Figure 5 is Figure 4 the schematic structural view from the A-A perspective in

[0033] Wherein, 1 - C-type storage tank, 2 - liquid dome, 3 - through-tank piping system, 4 - first manhole cover, 5 - stairway, 6 - CH monitor, 7 - second manhole cover, 8 - top plate, 9 - bottom plate, 10 - first through-tank section, 11 - second through-tank section, 12 - third through-tank section, 13 - upper section bulkhead, 14 - middle section bulkhead, 15 - lower section bulkhead, 16 - through-tank opening. Detailed implementation manners

[0034] The present invention will be further described in conjunction with the accompanying drawings.

[0035] A novel continuous C-type storage tank liquid dome for a hull, as Figures 2 to 5 shown, the liquid dome 2 is arranged at the center line of the C-type storage tank 1. The C-type storage tank is used as a liquid cargo tank, and the liquid dome structure needs to extend out of the ship's deck surface. The outer surface of the C-type storage tank 1 is covered with an insulating layer, and the insulating layer uses polyurethane foam.

[0036] The liquid dome is divided into upper and lower sections. The diameter of the upper liquid dome is smaller than that of the lower liquid dome. The upper liquid dome and the lower liquid dome are connected into one body through the middle-section bulkhead. The inside of the upper liquid dome and the lower liquid dome is connected and communicated. The top of the upper liquid dome is sealed with a top plate, and the bottom of the lower liquid dome is sealed with a bottom plate. The edge of the bottom plate is connected and integrated with the bulkhead of the C-type storage tank. The lower liquid dome is formed by enclosing a frustum of a cone with a lower-section bulkhead. The outer diameter of the connection between the lower-section bulkhead and the storage tank is 5000 mm. The lower-section bulkhead and the bottom plate form an included angle α, and α = 85°. The upper liquid dome is formed by enclosing a cylinder with an upper-section bulkhead. The outer diameter of the upper-section bulkhead is 2600 mm. The upper-section bulkhead and the lower-section bulkhead are connected through the middle-section bulkhead. The middle-section bulkhead forms an included angle β with the horizontal plane, and β = 10°. The height H1 of the upper-section bulkhead exceeding the ship's deck surface is 600 mm. The upper-section bulkhead passes through the ship's deck in a continuous structure form, and the ship's deck is provided with an opening in the area where the upper-section bulkhead of the liquid dome passes through. The lower-section bulkhead adopts the form of a regular trapezoidal frustum. The bottom end is a space curve and is welded to the C-type storage tank shell. The top end is a plane curve and is connected to the middle-section bulkhead. The middle-section bulkhead adopts the form of a regular trapezoidal frustum. Both the bottom end and the top end are plane curves. The bottom end is connected to the lower-section bulkhead, and the top end is connected to the upper-section bulkhead. The minimum distance D1 between the middle-section bulkhead and the pipe system passing through the hull is 150 mm.

[0037] A CH monitoring device 6 is arranged inside the liquid dome, which can provide an alarm when gas leaks.

[0038] Multiple hull penetration openings are provided on the bottom plate. Hull penetration openings are provided in the area where various pipe systems 3 passing through the hull are located, and manholes are provided at the positions where personnel enter. Multiple sections of pipe systems passing through the hull extend upward through the hull penetration openings, penetrate through the top plate to above the deck, and the pipe systems passing through the hull are welded and fixed to the bottom plate and the top plate. The minimum opening distance requirements specified by the specifications shall be met between adjacent hull penetration openings and manholes. The distance DH between the openings is taken as 500 mm to reduce the stress concentration problem brought to the shell of the C-type storage tank 1 due to the concentrated distribution of the holes.

[0039] A manhole is provided on the bottom plate, and a second manhole cover is arranged on the manhole. A ladder is arranged between the top plate and the bottom plate. The bottom of the ladder is fixed on the bottom plate, and the top extends upward through the top plate. The top end of the ladder is provided with a first manhole cover. A manhole is provided on the bottom plate, and a second manhole cover is arranged on the manhole. The manhole and the personnel ladder 5 together provide a passage for personnel to enter the internal space of the liquid dome. The manhole cover is of an airtight type. In this way, the shell of the C-type independent storage tank 1 is a complete airtight structure.

[0040] The through-hull pipe system consists of three sections. The section passing through the bottom plate is the first through-hull section, the section passing through the top plate is the third through-hull section, and the section located between the bottom plate and the top plate is the second through-hull section. The first through-hull section and the third through-hull section are straight pipes, and the second through-hull section is an S-shaped pipe. The height L1 of the first through-hull section extending out of the independent storage tank shell is 300 - 500 mm, and this distance ensures the welding process requirements between the first through-hull section and the storage tank shell. The second through-hull section is a curved transition section, and its structural form meets the connection requirements between the first through-hull section and the third through-hull section, concentrating each pipe system at the liquid dome top plate. After the curved transition, the second through-hull section needs to retain a part of the straight section, and the preferred length L2 of the straight section is 150 - 200 mm. The third through-hull section passes through the liquid dome top plate, is connected to the second through-hull section by welding at one end, and is connected to the deck pipe system by flange at the other end. The height L3 of the through-hull pipe system passing through the liquid dome top plate is not less than 150 mm to meet the process installation requirements.

[0041] The through-hull pipe system can adjust the angles and positions of each section inside the liquid dome space as needed to reduce the sizes of the liquid dome top plate and the upper enclosing plate, thereby reducing the deck opening and improving the structural safety. In this embodiment, the minimum distance L1 that the first through-hull section extends beyond the storage tank shell 1 is 400 mm; the length L2 of the straight section of the S-shaped second through-hull section is 150 mm; the height L3 that the third through-hull section extends beyond the liquid dome top plate is taken as 200 mm.

[0042] The present invention can keep the outer shell of the storage tank as a closed space, form the main pressure-bearing structure of the pressure vessel, and form a secondary protection space inside the novel liquid dome structure. In this way, while meeting the operating conditions of the liquid cargo system and the pipe system layout requirements, it can reduce the size of the storage tank opening, thereby reducing the structural stress here, improving the structural safety and the designability of the storage tank structure, and being more convenient for construction.

Claims

1. A continuous C-shaped storage tank liquid dome for a housing, characterized in that, The C-type storage tank (1) is located below the deck. A liquid dome (2) is provided at the top of the C-type storage tank, and the top of the liquid dome extends upward through the deck. The liquid dome is divided into upper and lower sections. The diameter of the upper section of the liquid dome is smaller than that of the lower section. The upper section and the lower section of the liquid dome are connected into one body by a middle section bulkhead. The inside of the upper section and the lower section of the liquid dome is connected. The top of the upper section of the liquid dome is sealed with a top plate (8), and the bottom of the lower section of the liquid dome is sealed with a bottom plate (9). The edge of the bottom plate is connected to the bulkhead of the C-type storage tank to form one body. A plurality of through-tank openings (16) are opened on the bottom plate. A plurality of sections of through-tank pipe systems (3) extend upward through the through-tank openings, penetrate through the top plate to above the deck, and the through-tank pipe systems are fixedly welded to the bottom plate. A ladder (5) is provided between the top plate and the bottom plate. The bottom of the ladder is fixed to the bottom plate, and the top extends upward through the top plate. A first manhole cover (4) is provided at the top of the ladder, and a manhole is opened on the bottom plate, and a second manhole cover (7) is provided on the manhole.

2. A continuous C-shaped storage tank liquid dome of a housing according to claim 1, characterized in that, The height H1 of the upper section of the liquid dome passing through the deck is 500 mm to 800 mm.

3. A continuous C-shaped storage tank liquid dome of a housing according to claim 1, characterized in that The lower section of the liquid dome is formed into a frustum shape by enclosing with a lower section bulkhead (15). The lower section bulkhead forms an angle α with the bottom plate. The upper section of the liquid dome is formed into a cylindrical shape by enclosing with an upper section bulkhead (13). The upper section bulkhead and the lower section bulkhead are connected by a middle section bulkhead (14), and the middle section bulkhead forms an angle β with the horizontal plane.

4. A continuous C-shaped storage tank liquid dome of a housing according to claim 1, characterized in that, The through-tank pipe system is composed of three sections. The section passing through the bottom plate is the first through-tank section (10), the section passing through the top plate is the third through-tank section (12), and the section between the bottom plate and the top plate is the second through-tank section (11). The first through-tank section and the third through-tank section are straight pipes, and the second through-tank section is an S-shaped pipe.

5. A continuous C-type storage tank liquid dome of a housing according to claim 1, characterized in that A CH monitor (6) is provided inside the liquid dome.

6. A continuous C-type storage tank liquid dome of a housing according to claim 1, characterized in that, The size of the through-tank opening is adapted to the thickness of the through-tank pipe system.

7. A continuous C-type storage tank liquid dome of a housing according to claim 1, characterized in that The first manhole cover and the second manhole cover are airtight manhole covers.

8. A continuous C-type storage tank liquid dome of a housing according to claim 1 or 6, characterized in that, The diameter of adjacent through-tank openings is not less than 200 mm.

9. A continuous C-shaped storage tank liquid dome of a housing according to claim 3, characterized in that, The range of the angle α is [70°, 90°], and the range of the angle β is [0°, 30°].

10. A continuous C-shaped storage tank liquid dome of a housing according to claim 4, characterized in that, The height L1 of the first through-tank section extending out of the bottom plate is 300 to 500 mm, and the height L3 of the third through-tank section extending out of the top plate is not less than 150 mm.

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