A pipeless cargo hold suitable for bulk carriers

Abstract

The present invention relates to a pipeless cargo hold suitable for bulk carriers, and belongs to the field of ship design and manufacturing technology. A left empty tank and a right empty tank are respectively provided in the left ballast tank and the right ballast tank on both sides of the double bottom of the bulk carrier, as well as in the left pier ballast tank and the right pier ballast tank in the pier area; pipelines are provided in the left empty tank and the right empty tank; and maintenance passages leading to the left empty tank and the right empty tank are respectively provided along the left and right corrugated bulkheads. The present invention can meet the requirements of ballast water volume, bending moment shear force, etc. in the design of bulk carriers, and can also meet the maintenance requirements of the shipowner for valve accessories under full load. The pipe volume eliminated by the present invention can be used as the ballast tank volume, so that the forepeak tank can be used as an empty tank, reducing the bending moment shear force of the ship design, effectively reducing the structural design weight, and reducing the shipyard construction cost.

Description

Technical Field

[0001] The invention relates to a tubeless cargo hold suitable for a bulk carrier, belonging to the technical field of ship design and manufacturing. Background Art

[0002] The ballast water pipes and bilge water pipes in the cargo hold section of bulk carriers are usually arranged in a tunnel at the bottom of the ship. To ensure the ship's cargo capacity and ballast tank volume, the tunnel space of bulk carriers is relatively small, and the crew can only lie flat on the tunnel trolley and move around. This structural feature results in a close distance between the crew and the hull structure, making it very difficult for the crew to repair the valves in the tunnel. At the same time, the crew feels very depressed in the confined space. Although the existing technologies such as Chinese patents CN212529974U, CN212605661U, CN109094727A and CN207580088U disclose many improved technical solutions, they still fail to overcome the defects of the traditional pipe layout of bulk carriers in the existing technology, which include: ① The ballast water pipes and bilge water pipes of the bulk carrier cargo hold section are usually arranged in the pipe at the bottom of the ship. The arrangement of the pipe occupies more volume of the bottom ballast tank, resulting in a reduction in draft during ballasted navigation. The forepeak tank needs to be used as a ballast tank to compensate for it. However, using the forepeak tank as a ballast tank will cause problems such as an increase in bending moment and structural design weight; ② The valves of the ballast water pipes and bilge water pipes are arranged in the pipe. Considering that the pipe is long and its space is limited, even if equipped with Even with a pipe trolley, it is still inconvenient for the crew to inspect and repair the valve accessories inside the pipe; ③ The ballast main is large in size, and the pipe is arranged below the double bottom. The space between the free end of the main engine in the bulk carrier's engine room and the cargo hold pipe is limited, making the layout of the ballast main very difficult; ④ Sometimes, according to loading needs, the bottom piers between the cargo holds need to be used as part of the ballast tank. However, the cargo hold sewage well level alarm sensor, bilge water pipe check valve, etc. are arranged in the empty compartment within the bottom piers. When the ship is fully loaded, the shipowner cannot promptly inspect the sewage well level sensor and other equipment through the pipe; ⑤ To meet the ballast tank capacity requirements, some shipowners have eliminated the pipe design, but still arranged the ballast water pipes and bilge water pipes in the double bottom ballast tank, using submerged valve accessories. The submerged valves are easily damaged, and the shipowner has high subsequent maintenance costs. Therefore, this technical field urgently needs to solve the technical problem of how to more reasonably and effectively arrange the pipelines in the cargo hold section of bulk carriers. Summary of the Invention

[0003] The purpose of the present invention is to solve the technical problem of how to arrange the pipelines in the cargo hold section of a bulk carrier more reasonably and effectively.

[0004] In order to achieve the purpose of solving the above-mentioned problems, the technical solution adopted by the present invention is to provide a pipeless cargo hold suitable for bulk carriers, in which a left empty tank and a right empty tank are respectively arranged in the left ballast tank and the right ballast tank on both sides of the double bottom of the bulk carrier and in the left bottom pier ballast tank and the right bottom pier ballast tank in the pier area; pipelines are provided in the left empty tank and the right empty tank; and inspection passages leading to the left empty tank and the right empty tank are respectively provided along the left and right corrugated bulkheads.

[0005] Preferably, the left empty compartment and the right empty compartment are arranged in the bottom pier.

[0006] Preferably, the left empty compartment and the right empty compartment are respectively provided with passages leading to the main deck through maintenance passages.

[0007] Preferably, cargo hold section ballast water pipes and bilge water pipes are respectively provided on both sides of the cargo hold.

[0008] Preferably, the cargo hold section ballast water pipes and bilge water pipes pass through the watertight bulkheads of the left void compartment and the right void compartment by using watertight through-tank fittings.

[0009] Preferably, the control valves provided on the ballast water pipes and bilge water pipes in the cargo hold section are arranged in a dry manner in the left and right empty compartments.

[0010] Preferably, the bottom pier is provided with manhole covers for entering the left empty compartment and the right empty compartment.

[0011] Preferably, a straight ladder or an electric ladder for going up and down is provided in the maintenance passage.

[0012] Preferably, the inspection passage is provided with an up and down straight ladder or an electric soft ladder from the left empty cabin or the right empty cabin to the top pier; and the top pier is provided with a straight ladder to the main deck.

[0013] Preferably, the ballast water pipes and bilge water pipes are submerged in the portions between the front and rear bottom piers of the two cargo holds, the pipes are arranged in the left ballast tank and the right ballast tank, and the pipes are treated to prevent seawater corrosion.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Compared with existing design solutions, the present invention mainly solves the pain points of ship design and shipowner application, reduces structural weight, optimizes ship design indicators, and objectively reduces ship construction costs.

[0016] This invention not only meets design requirements for ballast water volume and bending and shear forces, but also meets shipowners' maintenance requirements for valve accessories under full load. The eliminated pipe volume can be used as ballast tank volume, allowing the forepeak tank to be used as a void space. This reduces the bending and shear forces in the ship's design, effectively reducing structural design weight and lowering shipyard construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An overview of a typical cross-section of the present invention Figure 1 ;

[0018] Figure 2 An overview of a typical cross-section of the present invention Figure 2 ;

[0019] Figure 3 This is a typical top view of the present invention;

[0020] Figure 4 This is a typical longitudinal section overview of the present invention;

[0021] In the figure, CL represents the centerline of the hull; BL represents the baseline.

[0022] Figure markings: 1. Left ballast tank; 2. Right ballast tank; 3. Left bottom pier ballast tank; 4. Right bottom pier ballast tank; 5. Left empty tank; 6. Right empty tank; 7. Left cargo hold sewage well; 8. Right cargo hold sewage well; 9. Corrugated bulkhead; 10. Inspection passage; 11. Cargo hold; 12. Bottom pier; 13. Left ballast water pipe; 14. Right ballast water pipe; 15. Left bilge water pipe; 16. Right bilge water pipe; 17. Top pier; 18. Manhole cover. DETAILED DESCRIPTION

[0023] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0024] like Figure 1-4 As shown, the present invention provides a pipeless cargo hold suitable for bulk carriers. A left void space 5 and a right void space 6 are provided in the left and right ballast tanks 1 and 2 on either side of the double bottom of the bulk carrier, as well as in the left and right pier ballast tanks 3 and 4 in the area of ​​the pier 12. Pipelines are provided in the left and right void spaces 5 and 6, respectively. Access passages 10 are provided along the left and right corrugated bulkheads 9. The left and right void spaces 5 and 6 are located within the pier 12. Access to the main deck is provided through the access passages 10. Ballast water pipes and bilge water pipes are provided on both sides of the cargo hold 11. These pipes pass through the watertight bulkheads of the left and right void spaces 5 and 6 using watertight passage fittings. Control valves for the ballast water pipes and bilge water pipes are dry-type and installed in the left and right void spaces 5 and 6. Manhole covers 18 are installed on the bottom pier 12 for access to the left and right empty compartments 5 and 6. A vertical ladder or electric ladder is provided in the maintenance passage 10 for ascending and descending. A vertical ladder or electric ladder is provided in the maintenance passage 10, leading from the left and right empty compartments 5 and 6 to the top pier 17; a vertical ladder is provided in the top pier 17 to the main deck. Ballast water pipes and bilge water pipes are submerged between the fore and aft bottom piers 12 of the two cargo holds. The pipes are installed in the left and right ballast tanks 1 and 2, and are treated to prevent seawater corrosion.

[0025] Example

[0026] The present invention provides a ductless cargo hold suitable for bulk carriers, eliminating the need for ducts for piping within the midship double bottom. The ductless cargo hold includes a left ballast tank 1, a right ballast tank 2, a left pier ballast tank 3, a right pier ballast tank 4, a left void tank 5, a right void tank 6, a left cargo hold bilge well 7, a right cargo hold bilge well 8, a corrugated bulkhead 9, an access passage 10, a cargo hold 11, a pier 12, a left ballast water pipe 13, a right ballast water pipe 14, a left bilge water pipe 15, a right bilge water pipe 16, and a top pier 17. The left void tank 5 and the right void tank 6 are disposed within the left pier ballast tank 1 / right ballast tank 2 and the left pier ballast tank 3 / right pier ballast tank 4 in the pier area on both sides of the bulk carrier's double bottom. The left void tank 5 and the right void tank 6 are disposed solely within the pier 12 and do not need to extend to other areas of the left ballast tank 1 / right ballast tank 2. The port void space 5 and right void space 6 of the pier 12 are accessible from the main deck. The port ballast water pipe 13 / right ballast water pipe 14 and the port bilge water pipe 15 / right bilge water pipe 16 of the cargo hold section are located on either side of the cargo hold 11. These pipes are located above the double bottom and penetrate the watertight bulkheads of the port and right void spaces 5 and 6 using watertight access fittings. The control valves for these pipes are located within the port void space 5 and 6, creating a dry-type arrangement that facilitates maintenance by the shipowner. When the cargo hold 11 is empty, crew members can access the port void space 5 and 6 through the manhole cover 18 provided on the pier 12 to repair the pipe valves and fittings. An inspection passage 10 is provided in the corrugated bulkhead 9. When the cargo hold 11 is full of cargo, the crew can enter the left empty compartment 5 and the right empty compartment 6 through the inspection passage 10 to repair the relevant valve accessories. The inspection passage 10 can be accessed by a straight ladder or an electric ladder, but the access method is not limited to this. Figure 1 The inspection passage 10 can be ascended to the top pier 17 by a straight ladder, and then ascended to the main deck by a straight ladder at the top pier 17, as shown in FIG. Figure 2 As shown, the left ballast water pipe 13 / right ballast water pipe 14 and the left bilge water pipe 15 / right bilge water pipe 16 are arranged between the front and rear piers 12 of the two cargo holds 11, using an immersed arrangement. The pipes are arranged in the left ballast tank 1 and the right ballast tank 2, and anti-seawater corrosion measures are required for the pipes.

[0027] The following is a comparison between this solution and the conventional solution for Newcastle-type bulk carriers (210,000-ton bulk carriers):

[0028]

[0029] As can be seen from the examples, the cargo hold section provided by the present invention adopts a pipeless design, and the ballast tank volume is increased by 2600m 3 Therefore, the forepeak tank no longer needs to be used as a ballast tank, reducing the bending moment and shear force of the ship and reducing the weight of the structure by 100t. While optimizing the ship design indicators, it also reduces the construction cost of the shipyard. Due to the clever use of the corresponding relationship between the corrugated bulkhead and the empty tank, the valve accessories in the empty tank can be inspected and repaired through the inspection channel of the corrugated bulkhead when the ship is fully loaded, meeting the actual use needs of the shipowner.

[0030] Currently, most bulk carrier cargo hold sections adopt a tunnel design, in which ballast water pipes and bilge water pipes are arranged. Even if a small number of shipowners cancel the tunnel, their ballast water pipes and bilge water pipes are still arranged at the original tunnel location, but they are made into an immersed type. This method makes it difficult to repair the valve accessories on the pipeline and is abandoned by most shipowners. The technical solution of the present invention, targeting the pain points of ship design and shipowner application, proposes for the first time a tunnel-free solution arranged on both sides, which not only meets the requirements of ballast water volume, bending moment shear force, etc. in the design, but also meets the maintenance requirements of valve accessories by shipowners under full load. The tunnel volume cancelled by the present invention is used as the ballast tank volume, so that the forepeak tank can be used as an empty tank, reducing the bending moment shear force of the ship design, effectively reducing the structural design weight, and reducing the shipyard construction cost.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form or substance. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the scope of protection of the present invention. Any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the spirit and scope of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A tubeless cargo hold suitable for bulk carriers, characterized in that: A left void tank and a right void tank are respectively provided in the left ballast tank and the right ballast tank on both sides of the double bottom of the bulk carrier and in the ballast tank of the left bottom pier and the ballast tank of the right bottom pier in the pier area; the left void tank and the right void tank are arranged in the pier, and pipelines are provided in the left void tank and the right void tank; inspection passages leading to the left void tank and the right void tank are respectively provided along the left and right corrugated bulkheads; cargo hold section ballast water pipes and bilge water pipes are respectively provided on both sides of the cargo hold; the control valves provided on the cargo hold section ballast water pipes and the bilge water pipes are dry-type arranged in the left and right void tanks; the ballast water pipes and the bilge water pipes between the front and rear piers of the two cargo holds are submerged, and the pipelines are provided in the left ballast tank and the right ballast tank.

2. The tubeless cargo hold suitable for bulk carriers according to claim 1, characterized in that: The left empty compartment and the right empty compartment are respectively provided with passages leading to the main deck through inspection passages.

3. The tubeless cargo hold suitable for bulk carriers according to claim 1, characterized in that: The ballast water pipes and bilge water pipes of the cargo hold section pass through the watertight bulkheads of the left void compartment and the right void compartment by using watertight through-compartments.

4. The tubeless cargo hold suitable for bulk carriers according to claim 1, characterized in that: The bottom pier is provided with manhole covers for entering the left empty compartment and the right empty compartment.

5. The tubeless cargo hold suitable for bulk carriers according to claim 1, characterized in that: A straight ladder or an electric ladder for going up and down is provided in the inspection passage.

6. The tubeless cargo hold suitable for bulk carriers according to claim 1, characterized in that: The inspection passage is provided with an up and down straight ladder or an electric soft ladder from the left empty cabin or the right empty cabin to the top pier; the top pier is provided with a straight ladder to the main deck.

7. The tubeless cargo hold suitable for bulk carriers according to claim 1, characterized in that: The ballast water pipes and bilge water pipes are treated to prevent seawater corrosion.

Images