CN111874156A - Ballast water system and ship - Google Patents

Ballast water system and ship Download PDF

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Publication number
CN111874156A
CN111874156A CN202010761469.2A CN202010761469A CN111874156A CN 111874156 A CN111874156 A CN 111874156A CN 202010761469 A CN202010761469 A CN 202010761469A CN 111874156 A CN111874156 A CN 111874156A
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CN
China
Prior art keywords
ballast
water
communicated
pipe
main pipe
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Pending
Application number
CN202010761469.2A
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Chinese (zh)
Inventor
苗立勇
庄雪婷
严锋泉
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Guangzhou Shipyard International Co Ltd
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Guangzhou Shipyard International Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Shipyard International Co Ltd filed Critical Guangzhou Shipyard International Co Ltd
Priority to CN202010761469.2A priority Critical patent/CN111874156A/en
Publication of CN111874156A publication Critical patent/CN111874156A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B13/00Conduits for emptying or ballasting; Self-bailing equipment; Scuppers

Abstract

The invention belongs to the technical field of ship manufacturing. Disclosed are a ballast water system and a ship. The ballast water system comprises a ballast pump, a ballast pipeline and an on-off valve. The ballast pipeline comprises a water inlet main pipe and a water outlet main pipe, a water inlet of the ballast pump is communicated with the water inlet main pipe, and a water outlet of the ballast pump is communicated with the water outlet main pipe. The water inlet main pipe is communicated with a plurality of water outlet branch pipes, and the water outlet main pipe is communicated with a plurality of water inlet branch pipes. Each ballast tank can be communicated with one water outlet branch pipe and one water inlet branch pipe. Switch valves are respectively arranged on the water outlet branch pipe and the water inlet branch pipe, and the switch valve of the water outlet branch pipe communicated with one ballast tank and the switch valve of the water inlet branch pipe communicated with the other ballast tank are opened simultaneously, so that a communicated ballast water distribution pipeline is formed between the two ballast tanks. The ballast water between any two ballast tanks is adjusted by adjusting the opening and closing of the switch valve. A ship includes above-mentioned ballast water system. The ballast water can be allocated between any two ballast tanks.

Description

Ballast water system and ship
Technical Field
The invention relates to the technical field of ship manufacturing, in particular to a ballast water system and a ship.
Background
During the process of ship navigation or berthing, the ship floating state is often required to be adjusted to ensure the stability of the ship due to the change of external conditions, and the ship floating state is adjusted by allocating ballast water in each ballast tank.
The ballast water system of the existing ship is generally a branch pipe type or an annular main pipe type, can only realize the allocation of the ballast water between a front ballast tank and a rear ballast tank or between a left ballast tank and a right ballast tank, and cannot realize the allocation of the ballast water between any two ballast tanks on the ship. When the ballast water in any two ballast tanks needs to be adjusted, the ballast water in the specified ballast tank can only be transferred out of the ballast water system or the external water can be transferred into the specified ballast tank, so that the efficiency is low, and the process is complicated.
Therefore, a ballast water system and a ship are required to solve the above problems.
Disclosure of Invention
One object of the present invention is to provide a ballast water system, so as to implement allocation of ballast water between any two ballast tanks on a ship and improve allocation efficiency of the ballast water system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a ballast water system for adjusting ballast water in a ballast tank, comprising:
a ballast pump;
the ballast pipeline comprises a water inlet main pipe and a water outlet main pipe, a water inlet of the ballast pump is communicated with the water inlet main pipe, and a water outlet of the ballast pump is communicated with the water outlet main pipe; the water inlet main pipe is provided with a plurality of water outlet branch pipes in a communicating manner, and the water outlet main pipe is provided with a plurality of water inlet branch pipes in a communicating manner; each ballast tank can be communicated with one water outlet branch pipe and one water inlet branch pipe;
the switch valve, go out the water branch pipe with it all installs to intake branch pipe the switch valve, the switch valve is configured to open simultaneously rather than one the ballast tank intercommunication go out the water branch pipe with another the ballast tank intercommunication intake branch pipe, so that two the ballast water of formation intercommunication between the ballast tank transfers the pipeline.
Preferably, the ballast pipeline further comprises a plurality of general pipelines, and the number of the general pipelines is the same as that of the ballast tanks, and the general pipelines are communicated with the ballast tanks in a one-to-one correspondence manner; the water outlet branch pipe and the water inlet branch pipe which can be communicated with the same ballast tank are intersected and communicated with the corresponding general pipeline into a whole.
Preferably, the water inlet main pipe, the water outlet main pipe and the plurality of switch valves are all installed in the same equipment room.
Preferably, a plurality of the switching valves are collectively arranged, thereby forming an operating valve group.
Preferably, the number of the ballast pumps is two, the water inlets of the two ballast pumps are both communicated with the water inlet main pipe, and the water outlets of the two ballast pumps are both communicated with the water outlet main pipe.
Preferably, the ballast pump is a variable frequency water pump.
Preferably, the ballast water system further comprises a suction pipe and a drain pipe, wherein the suction pipe is communicated with the water inlet of the ballast pump, and the drain pipe is communicated with the water outlet of the ballast pump; the ballast pump can suck external water into the ballast tank through the suction pipe; alternatively, the ballast pump may be capable of discharging ballast water in the ballast tank out of the ballast line through the drain pipe.
Preferably, the ballast water system further comprises a check valve installed on the drain pipe.
Preferably, the lengths of the water inlet main pipe and the water outlet main pipe are both 3 m-5 m.
Another object of the present invention is to provide a ship, so as to realize allocation of ballast water between any two ballast tanks on the ship and improve allocation efficiency of a ballast water system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a ship comprises the ballast water system.
The invention has the beneficial effects that:
the ballast water system provided by the invention comprises a ballast pump, a ballast pipeline and a switch valve. And meanwhile, a water outlet branch pipe communicated with one ballast tank and a water inlet branch pipe communicated with the other ballast tank are opened, so that ballast water in the ballast tank enters the other ballast tank through a ballast water allocation pipeline formed by sequentially communicating the water outlet branch pipe, the water inlet main pipe, the ballast pump, the water outlet main pipe and the water inlet branch pipe, allocation of the ballast water between any two ballast tanks is realized, and the allocation efficiency of a ballast water system is improved.
The ship provided by the invention comprises the ballast water system. And meanwhile, a water outlet branch pipe communicated with one ballast tank and a water inlet branch pipe communicated with the other ballast tank are opened, so that ballast water in the ballast tank enters the other ballast tank through a ballast water allocation pipeline formed by sequentially communicating the water outlet branch pipe, the water inlet main pipe, the ballast pump, the water outlet main pipe and the water inlet branch pipe, allocation of the ballast water between any two ballast tanks is realized, and the allocation efficiency of a ballast water system and the adaptability of a ship are improved.
Drawings
Fig. 1 is a schematic view of piping connections of a ballast water system according to an embodiment of the present invention.
The component names and designations in the drawings are as follows:
10. a ballast tank; 11. a first ballast tank; 12. a second ballast tank; 13. a third ballast tank; 14. a fourth ballast tank;
1. a ballast pump; 2. a water inlet main pipe; 3. a water outlet main pipe; 41. a first water outlet branch pipe; 42. a second outlet branch pipe; 43. a third outlet branch pipe; 44. a fourth water outlet branch pipe; 45. a general purpose pipe; 51. a first water inlet branch pipe; 52. a second water inlet branch pipe; 53. a third water inlet branch pipe; 54. a fourth water inlet branch pipe; 6. an on-off valve; 7. a suction pipe; 8. a drain pipe; 9. a check valve.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, the present embodiment discloses a ballast water system for adjusting ballast water in a ballast tank 10. The ballast water system includes a ballast pump 1, ballast lines, and an on-off valve 6. The ballast pipeline comprises a water inlet main pipe 2 and a water outlet main pipe 3, a water inlet of the ballast pump 1 is communicated with the water inlet main pipe 2, and a water outlet of the ballast pump 1 is communicated with the water outlet main pipe 3. The water inlet main pipe 2 is communicated with a plurality of water outlet branch pipes, and the water outlet main pipe 3 is communicated with a plurality of water inlet branch pipes. Each ballast tank 10 can communicate with one outlet branch and one inlet branch. The water outlet branch pipe and the water inlet branch pipe are both provided with a switch valve 6, and the switch valve 6 of the water outlet branch pipe communicated with one ballast tank 10 and the switch valve 6 of the water inlet branch pipe communicated with the other ballast tank 10 are opened simultaneously, so that a communicated ballast water distribution pipeline is formed between the two ballast tanks 10.
In this embodiment, by adjusting the open/close state of the on-off valve 6, the water outlet branch pipe communicated with one of the ballast tanks 10 and the water inlet branch pipe communicated with the other ballast tank 10 are simultaneously opened, so that the ballast water in the ballast tank 10 enters the other ballast tank 10 through the ballast water distribution pipeline formed by sequentially communicating the opened water outlet branch pipe, the water inlet main pipe 2, the ballast pump 1, the water outlet main pipe 3 and the opened water inlet branch pipe, thereby realizing distribution of the ballast water between any two ballast tanks 10 and being beneficial to improving the distribution efficiency of the ballast water system.
Preferably, the ballast lines further comprise a plurality of common conduits 45, the common conduits 45 being in the same number as the ballast tanks 10 and communicating in one-to-one correspondence. The water outlet branch pipes and the water inlet branch pipes which can be communicated with the same ballast tank 10 are intersected and communicated with the corresponding universal pipelines 45 into a whole.
Specifically, each ballast tank 10 is communicated with its corresponding water outlet branch pipe and water inlet branch pipe through a common pipeline 45. Ballast water in a ballast tank 10 can enter a water outlet branch pipe through a general pipe 45, and ballast water in other ballast tanks 10 can enter the general pipe 45 through a water inlet branch pipe and then enter the ballast tank 10. Accordingly, the utility conduit 45 may reduce the overall tube length and weight of the ballast lines, reducing production costs. Meanwhile, the water outlet branch pipe and the water inlet branch pipe are communicated with the ballast tank 10 through a common pipeline, so that the number of openings of the ballast tank 10 is reduced, and the layout of ballast pipelines is optimized.
Continuing with fig. 1, in this embodiment, the vessel includes four ballast tanks 10, a first ballast tank 11, a second ballast tank 12, a third ballast tank 13, and a fourth ballast tank 14. The water inlet main 2 is provided with four water outlet branch pipes, which are a first water outlet branch pipe 41, a second water outlet branch pipe 42, a third water outlet branch pipe 43 and a fourth water outlet branch pipe 44. The outlet manifold 3 is provided with four inlet branch pipes, which are a first inlet branch pipe 51, a second inlet branch pipe 52, a third inlet branch pipe 53 and a fourth inlet branch pipe 54. The first water outlet branch pipe 41 and the second water inlet branch pipe 52 are both communicated with the first ballast tank 11, the second water outlet branch pipe 42 and the first water inlet branch pipe 51 are both communicated with the second ballast tank 12, the third water outlet branch pipe 43 and the fourth water inlet branch pipe 54 are both communicated with the third ballast tank 13, and the fourth water outlet branch pipe 44 and the third water inlet branch pipe 53 are both communicated with the fourth ballast tank 14. It will be appreciated that the number of ballast tanks 10 may also be two, three, five or more. Accordingly, the number of outlet and inlet branch pipes is increased.
For ease of understanding, taking the example of ballast water transfer between the first ballast tank 11 and the second ballast tank 12, the transfer of ballast water between the two ballast tanks 10 includes:
the process of transferring ballast water in the first ballast tank 11 to the second ballast tank 12:
the open/close valve 6 of the first outlet branch pipe 41 and the open/close valve 6 of the first inlet branch pipe 51 are opened, and the other open/close valves 6 are kept closed. The ballast pump 1 is turned on, and the ballast water in the first ballast tank 11 finally enters the second ballast tank 12 through the corresponding general pipeline 45, the first water outlet branch pipe 41, the water inlet main pipe 2, the ballast pump 1, the water outlet main pipe 3, the first water inlet branch pipe 51 and the corresponding general pipeline 45 of the second ballast tank 12. Through the above-described diversion process, a specified amount of ballast water in the first ballast tank 11 can be diverted into the second ballast tank 12.
The process of transferring ballast water in the second ballast tank 12 to the first ballast tank 11:
the open/close valve 6 of the second outlet branch pipe 42 and the open/close valve 6 of the second inlet branch pipe 52 are opened, and the other open/close valves 6 are kept closed. The ballast pump 1 is turned on, and the ballast water in the second ballast tank 12 passes through the corresponding general pipeline 45, the second water outlet branch pipe 42, the water inlet main pipe 2, the ballast pump 1, the water outlet main pipe 3, the second water inlet branch pipe 52 and the corresponding general pipeline 45 of the first ballast tank 11, and finally enters the first ballast tank 11. Through the above-described diversion process, a specified amount of ballast water in the second ballast tank 12 can be diverted into the first ballast tank 11.
The transfer of ballast water between the two ballast tanks 10 is completed by the above operations. Similarly, the ballast water can be allocated between the first ballast tank 11 and the third ballast tank 13, between the first ballast tank 11 and the fourth ballast tank 14, between the second ballast tank 12 and the third ballast tank 13, between the second ballast tank 12 and the fourth ballast tank 14, and between the third ballast tank 13 and the fourth ballast tank 14. Here, the description is omitted.
Preferably, the water inlet manifold 2, the water outlet manifold 3 and the plurality of switch valves 6 are all installed in the same equipment room. An operator only needs to control the opening and closing of each switch valve 6 in one equipment room so as to conveniently and quickly finish the allocation of ballast water between any two ballast tanks 10.
Further preferably, a plurality of on-off valves 6 are collectively arranged, thereby forming an operation valve group. And a remote control valve is not needed, so that the operating cost of the ballast water system is saved. The operation of operating personnel is further facilitated, and time and labor are saved.
Continuing with fig. 1, preferably, the number of ballast pumps 1 is two, the water inlets of two ballast pumps 1 are both communicated with the water inlet main pipe 2, and the water outlets of two ballast pumps 1 are both communicated with the water outlet main pipe 3. One of the two ballast pumps 1 is a working pump. The other is a backup pump. Under normal conditions, the working pump is used as a power source to realize the allocation operation of driving the ballast water in the two ballast tanks 10. When the working pump fails or is overhauled, the backup pump is started to finish the allocation operation of the ballast water in the two ballast tanks 10. Moreover, when a large amount of ballast water needs to be allocated, the two ballast pumps 1 can be started simultaneously to increase the allocation efficiency of the ballast water system.
Preferably, ballast pump 1 is the variable frequency water pump for ballast pump 1 can adjust self operating frequency in real time according to the ballast water transfer work load of reality, improves ballast pump 1's suitability, reduces the energy consumption.
As shown in fig. 1, the ballast water system further includes a suction pipe 7 and a drain pipe 8, the suction pipe 7 is communicated with the water inlet of the ballast pump 1, and the drain pipe 8 is communicated with the water outlet of the ballast pump 1. The ballast pump 1 can suck external water into the ballast tank 10 through the suction pipe 7. Alternatively, the ballast pump 1 can discharge the ballast water in the ballast tank 10 out of the ballast line through the water discharge pipe 8. By opening the on-off valves 6 of the water inlet branch pipes communicating with the specified ballast tank 10, and the other on-off valves 6 are in the closed state, the ballast system can allocate external water to the specified ballast tank 10 through the suction pipe 7. Alternatively, the switching valve 6 of the outlet branch pipe communicating with the specified ballast tank 10 is opened, and the other switching valves 6 are in a closed state, so that the ballast system can discharge the ballast water of the specified ballast tank 10 out of the ballast water system, thereby realizing the ballast water distribution operation of the individual ballast tank 10.
Preferably, the ballast water system further comprises a check valve 9, the check valve 9 being mounted on the drain pipe 8. The water discharge pipe 8 of a general ship is communicated with seawater or river water in the ship navigation area, and the check valve 9 can effectively prevent external water from entering a ballast water system through the water discharge pipe 8 to destroy the floating state of the ship.
In this embodiment, the lengths of the water inlet header pipe 2 and the water outlet header pipe 3 are both 3m to 5 m. The length of the water inlet main pipe 2 and the water outlet main pipe 3 is shorter, the length and the weight of a pipeline of the ballast water system are reduced, and the production cost is reduced.
The implementation also provides a ship comprising the ballast water system. The ship can realize allocation of ballast water between any two ballast tanks 10, and is favorable for improving allocation efficiency of a ballast water system and adaptability of the ship.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A ballast water system for adjusting ballast water in a ballast tank (10), comprising:
a ballast pump (1);
the ballast pipeline comprises a water inlet main pipe (2) and a water outlet main pipe (3), a water inlet of the ballast pump (1) is communicated with the water inlet main pipe (2), and a water outlet of the ballast pump (1) is communicated with the water outlet main pipe (3); the water inlet main pipe (2) is provided with a plurality of water outlet branch pipes in a communicated manner, and the water outlet main pipe (3) is provided with a plurality of water inlet branch pipes in a communicated manner; each ballast tank (10) is capable of communicating with one said outlet branch and one said inlet branch;
the switch valve (6) is installed on each of the water outlet branch pipe and the water inlet branch pipe, and the switch valve (6) is configured to be capable of simultaneously opening the water outlet branch pipe communicated with one ballast tank (10) and the water inlet branch pipe communicated with the other ballast tank (10) so as to form a communicated ballast water transfer pipeline between the two ballast tanks (10).
2. The ballast water system according to claim 1, wherein the ballast line further comprises a plurality of common pipes (45), the common pipes (45) being in the same number as the ballast tanks (10) and communicating in one-to-one correspondence; the water outlet branch pipe and the water inlet branch pipe which can be communicated with the same ballast tank (10) are intersected and communicated with the corresponding general pipeline (45) into a whole.
3. The ballast water system according to claim 1, wherein the water inlet main pipe (2), the water outlet main pipe (3) and the plurality of on-off valves (6) are installed in the same equipment room.
4. Ballast water system according to claim 1, wherein a plurality of said on-off valves (6) are arranged in a set, thereby forming an operating valve group.
5. The ballast water system according to claim 1, wherein the number of the ballast pumps (1) is two, the water inlets of both of the ballast pumps (1) are communicated with the water inlet main pipe (2), and the water outlets of both of the ballast pumps (1) are communicated with the water outlet main pipe (3).
6. Ballast water system according to claim 5, wherein the ballast pump (1) is a variable frequency water pump.
7. The ballast water system according to claim 1, further comprising a suction pipe (7) and a drain pipe (8), the suction pipe (7) being in communication with the water inlet of the ballast pump (1), the drain pipe (8) being in communication with the water outlet of the ballast pump (1); the ballast pump (1) can suck external water into the ballast tank (10) through the suction pipe (7); alternatively, the ballast pump (1) is capable of discharging ballast water in the ballast tank (10) out of the ballast line through the drain pipe (8).
8. The ballast water system according to claim 7, further comprising a check valve (9), said check valve (9) being mounted on said drain pipe (8).
9. A ballast water system according to claim 1, wherein the length of each of the inlet main pipe (2) and the outlet main pipe (3) is 3m to 5 m.
10. A marine vessel comprising the ballast water system of any one of claims 1 to 9.
CN202010761469.2A 2020-07-31 2020-07-31 Ballast water system and ship Pending CN111874156A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010761469.2A CN111874156A (en) 2020-07-31 2020-07-31 Ballast water system and ship

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Application Number Priority Date Filing Date Title
CN202010761469.2A CN111874156A (en) 2020-07-31 2020-07-31 Ballast water system and ship

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CN111874156A true CN111874156A (en) 2020-11-03

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CN202010761469.2A Pending CN111874156A (en) 2020-07-31 2020-07-31 Ballast water system and ship

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114379708A (en) * 2022-02-25 2022-04-22 广船国际有限公司 Ship ballast water system and ship
CN114475951A (en) * 2022-03-18 2022-05-13 蓝洁丰仑海洋科技(上海)有限公司 Towing buoyancy tank ballast water system and control method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100743909B1 (en) * 2005-10-28 2007-08-02 삼성중공업 주식회사 Apparatus for ballast water exchanging system with effective removal of sediments in ship's ballast tank
CN203921155U (en) * 2014-03-31 2014-11-05 浙江海洋学院 Novel ballast pumping system
WO2015104341A2 (en) * 2014-01-09 2015-07-16 Bawat A/S A method for treating ballast water and a system for treatment of ballast water in a ship comprising at least two ballast tanks
CN107839852A (en) * 2017-12-02 2018-03-27 浙江宏盛造船有限公司 Ballasting system
CN207747989U (en) * 2017-11-02 2018-08-21 中国人民解放军陆军军事交通学院镇江校区 A kind of method of ship floating condition sub-controlling unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100743909B1 (en) * 2005-10-28 2007-08-02 삼성중공업 주식회사 Apparatus for ballast water exchanging system with effective removal of sediments in ship's ballast tank
WO2015104341A2 (en) * 2014-01-09 2015-07-16 Bawat A/S A method for treating ballast water and a system for treatment of ballast water in a ship comprising at least two ballast tanks
CN203921155U (en) * 2014-03-31 2014-11-05 浙江海洋学院 Novel ballast pumping system
CN207747989U (en) * 2017-11-02 2018-08-21 中国人民解放军陆军军事交通学院镇江校区 A kind of method of ship floating condition sub-controlling unit
CN107839852A (en) * 2017-12-02 2018-03-27 浙江宏盛造船有限公司 Ballasting system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114379708A (en) * 2022-02-25 2022-04-22 广船国际有限公司 Ship ballast water system and ship
CN114475951A (en) * 2022-03-18 2022-05-13 蓝洁丰仑海洋科技(上海)有限公司 Towing buoyancy tank ballast water system and control method thereof

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Application publication date: 20201103