CN112823119A

CN112823119A - Ship with a detachable cover

Info

Publication number: CN112823119A
Application number: CN201980066057.2A
Authority: CN
Inventors: 塚本泰史; 津村健司; 田村浩; 上田伸
Original assignee: Mitsubishi Shipbuilding Co Ltd
Current assignee: Mitsubishi Shipbuilding Co Ltd
Priority date: 2018-10-10
Filing date: 2019-10-04
Publication date: 2021-05-18
Also published as: SG11202103581QA; KR20230106715A; JP6942681B2; KR20210053985A; WO2020075642A1; KR102687769B1; JP2020059397A

Abstract

A ship is provided with: a hull; a tank (3) provided in the hull and containing a liquid liquefied gas (L); a liquid level detection unit (8) that detects the liquid level of the liquefied gas (L) in the tank (3); and an information processing device (20) to which the value of the liquid level detected by the liquid level detection unit (8) is input. An information processing device (20) is provided with: a storage unit (23) that stores a maximum liquid level set value (Lm) for each of a plurality of liquefied gases (L) having different specific gravities, the tank (3) being set for each of the plurality of liquefied gases (L); and a determination unit (24) that determines whether or not the value of the liquid level input from the liquid level detection unit (8) has reached a maximum liquid level set value (Lm) corresponding to the type of liquefied gas (L) stored in the tank (3).

Description

Ship with a detachable cover

Technical Field

The present invention relates to ships.

The present application claims priority to japanese patent application No. 2018-192054 filed on the sun in 2018, 10.10.4, and the contents of which are incorporated herein by reference.

Background

A ship for transporting Liquefied Natural Gas (LNG) or the like includes a hull and a plurality of tanks. The plurality of tanks are arranged in line in the fore-and-aft direction of the hull, and each tank accommodates a load such as LNG.

For example, patent document 1 discloses the following structure: in order to load and transport a plurality of gases such as LNG, LPG (Liquefied Petroleum Gas)), ethane, and ethylene on the same Liquefied Gas carrier, the tank has a structural strength that allows the loading of ethylene having the highest liquid specific gravity.

Documents of the prior art

Patent document 1: japanese patent laid-open publication No. 2016-22931

Disclosure of Invention

Problems to be solved by the invention

However, the ship is used for a long period of time, for example, over twenty years. Meanwhile, the size of the ship as described above is increased with the age, and the fuel consumption rate during navigation is improved by the progress of the propulsion engine. Therefore, the existing ships of old type tend to have a low operating rate although they can be used. In the case of ships transporting LNG and the like, the tanks are made of materials that are not easily corroded, such as aluminum alloys, and therefore, the utility value is high. Therefore, there is a desire to effectively utilize the existing ship when the hull or the propulsion engine is in a usable state.

However, a ship manufactured to transport LNG has its structural strength set in accordance with the specific gravity of LNG. When a liquefied gas having a larger specific gravity than LNG is loaded, the liquefied gas in a state of being fully loaded in the tank has a larger weight than that in a state of being fully loaded with LNG. Therefore, when loading liquefied gas having a larger specific gravity than LNG, the structural strength of the tank may be insufficient. Therefore, if the structure disclosed in patent document 1 is applied to a conventional ship manufactured to transport LNG, it is not possible to load liquefied gas having a larger specific gravity than LNG. That is, in the structure disclosed in patent document 1, it is difficult to load other kinds of load having a higher specific gravity than the load assumed when the structural strength of the tank is set.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a ship capable of storing a load in a tank in an appropriate state and transporting the load regardless of the specific gravity of the load.

Means for solving the problems

The present invention adopts the following means to solve the above problems.

According to a first aspect of the present invention, a ship includes: a hull; a tank provided in the hull and configured to accommodate a liquid load; a liquid level detection unit for detecting a liquid level of the load in the tank; and an information processing device to which a value of the liquid level detected by the liquid level detection unit is input, the information processing device including: a storage unit for storing a maximum set value of the liquid level of the tank set for each of a plurality of types of the load having different specific gravities; and a determination unit that determines whether or not the value of the liquid level input from the liquid level detection unit has reached the maximum liquid level set value corresponding to the type of the load contained in the tank.

In this way, the maximum level set value of the tank is stored for each type of load stored in the tank. The determination unit determines whether or not the value of the liquid level of the loaded object detected by the liquid level detection unit has reached a maximum liquid level set value set in accordance with the type of the loaded object stored in the tank. Thus, the liquid level of the load stored in the tank can be made not to exceed the maximum liquid level set value set according to the type of the load stored in the tank. Therefore, even when a load having a large specific gravity is stored in a can having a capacity and structural strength set in accordance with a load having a small specific gravity, an excessive load on the load stored in the can be suppressed.

According to the second aspect of the present invention, in the storage unit according to the first aspect, the maximum level set value set for each type of the load may be determined so that a load of the load does not exceed an allowable load of the tank in a state where the load is stored in the tank up to the maximum level set value.

With this configuration, even when a load having a large specific gravity is stored in a can having a capacity set in accordance with a load having a small specific gravity, an excessive load on the load stored in the can be suppressed.

According to a third aspect of the present invention, in the vessel according to the first or second aspect, the full-load level of the tank may be set based on the load having the lowest specific gravity among the plurality of types of loads loaded into the tank, and the maximum level setting value of the other loads having higher specific gravities than the load having the lowest specific gravity may be set below the full-load level.

With this configuration, even when a load having a large specific gravity is stored in a tank having a capacity set in accordance with a load having a small specific gravity, an excessive load of the load stored in the tank can be suppressed. That is, the load having the lowest specific gravity is stored in the tank until the load reaches the full liquid level, whereas the load having a higher specific gravity is stored in the tank in a state of being lower than the full liquid level.

According to a fourth aspect of the present invention, the vessel according to any one of the first to third aspects may further include an information output unit that outputs predetermined information to the outside when the determination unit determines that the value of the liquid level input from the liquid level detection unit has reached the maximum liquid level set value corresponding to the type of the load in the tank.

With this configuration, it is possible to output information indicating that the load stored in the tank has reached the maximum liquid level set value set in accordance with the type of the load to the outside. Thus, the operator who performs the task of storing the load in the tank can recognize that the load is stored in the tank up to the maximum liquid level set value, and automatically stop storing the load in the tank.

According to a fifth aspect of the present invention, the ship according to any one of the first to fourth aspects may include: a fuel supply device for taking out the gasified component of the load from the tank and supplying the gasified component as fuel for a propulsion engine provided on the hull; and a reliquefaction device that reliquefies a vaporized component of the load different from the load supplied to the propulsion engine by the fuel supply device and returns the liquefied component to the tank.

With this configuration, when the type of the load stored in the tank is a load that can use the gasified component as fuel for the propulsion engine, the gasified component is supplied as fuel to the propulsion engine by the fuel supply device. In addition, when the type of the load stored in the tank is a type that cannot be used as fuel for a propulsion engine, the gasified component can be reliquefied by the reliquefier and returned to the tank. This enables the gasification component to be appropriately treated according to the type of the load.

Effects of the invention

According to the ship, the load can be stored in the tank in an appropriate state and transported regardless of the specific gravity of the load.

Drawings

Fig. 1 is a side view showing a schematic structure of a conventional ship used in a ship according to an embodiment of the present invention.

Fig. 2 is a sectional view showing a structure of a tank provided in the conventional ship.

Fig. 3 is a sectional view showing a structure of a tank in a ship manufactured using the above-described conventional ship.

Fig. 4 is a flowchart showing a flow of the method for loading liquefied gas into the tank of the ship.

Detailed Description

Hereinafter, a ship according to an embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a side view showing a schematic structure of a conventional ship used in the ship of the present embodiment. Fig. 2 is a sectional view showing a structure of a tank provided in the conventional ship. Fig. 3 is a sectional view showing the configuration of a tank in a ship manufactured using a conventional ship.

As shown in fig. 1, a conventional ship 1 used in a ship 10 of this embodiment includes a hull 2 and a plurality of tanks 3. The ship has a pair of sides 2s and a bottom 2b provided on both sides in the ship width direction. The hull 2 includes an upper deck 2t provided above the bottom 2b with a space. The hull 2 has an upper structure 2h forming an accommodation portion and the like on the stern 2r side in the bow-to-stern direction Da. The hull 2 includes a cargo loading section (cargo hold) 2k on the bow 2a side in the bow-to-tail direction Da with respect to the superstructure 2 h. Further, an engine room including a main engine 4 for propelling the conventional ship 1 is provided in the hull 2 on the stern 2r side in the bow-to-stern direction Da.

The upper deck 2t is a through-exposed deck exposed to the outside, and is provided so as to cover the upper side of the cargo loading section 2 k.

A plurality of tanks 3 are arranged along the bow-to-stern direction Da in the cargo-carrying section 2k in the hull 2. The conventional ship 1 illustrated in this embodiment includes five tanks 3 as independent spherical tanks of a spherical shape. The upper portion 3a of the tanks 3 is disposed above the upper deck 2 t.

The plurality of tanks 3 store liquid liquefied gas (load) L. The conventional ship 1 of this embodiment is an LNG carrier, and LNG is stored in each tank 3. The tank 3 is formed of, for example, an aluminum alloy or the like in order to ensure toughness and corrosion resistance in a low-temperature environment. The tank 3 is designed and manufactured with a structural strength corresponding to the load of LNG (i.e., the volume × specific gravity of LNG) when the tank 3 is loaded with LNG to a predetermined full load level Lx (see fig. 2) so that the structural strength required for the full load of LNG is ensured.

As shown in fig. 2, each tank 3 is provided with a liquid level detection unit 8 that detects the liquid level of the liquefied gas L stored in the tank 3. The liquid level detection unit 8 is, for example, a radar-type liquid level gauge, and detects the value of the liquid level of the liquefied gas L in the tank 3 by irradiating radar of a predetermined frequency to the liquid level of the liquefied gas L in the tank 3. The liquid level detecting unit 8 is not limited to the radar type, and other types of liquid level detecting units such as a capacitance type and a float type may be used.

In the conventional ship 1, the liquid level detection unit 8 detects the value of the liquid level of LNG in the tank 3, thereby detecting whether LNG is loaded to the full liquid level Lx in the tank 3.

The conventional ship 1 further includes a fuel supply device 7 configured to supply boil-off gas as fuel to the main engine 4 when the LNG stored in the tank 3 is vaporized in the tank 3 to generate boil-off gas (vaporized component). The fuel supply device 7 supplies the evaporated gas from the respective tanks 3 to the main unit 4 (see fig. 1) through a connection pipe (not shown) connecting the inside of the respective tanks 3 and the main unit 4.

As shown in fig. 1, the conventional ship 1 is provided with a cargo pump (not shown) for unloading LNG in the tank 3, a manifold 9B, and the like. The cargo pump is disposed in the tank 3, and the manifold 9B is disposed on the upper deck 2 t.

The vessel 10 is manufactured by modifying an existing vessel 1. The ship 10 is manufactured by mainly additionally providing an information processing device 20 and a reliquefaction device 12 shown in fig. 3 to the existing ship 1. The hull 2, the tank 3, the fuel supply device 7, the liquid level detection unit 8, the cargo pump (not shown), and the manifold 9B of the conventional ship 1 are used as they are in the ship 10. In the ship 10, the tank 3 can contain not only LNG but also other types of liquefied gas (for example, butane, propane, ethane, ethylene, etc.). Specifically, the tank 3 can selectively contain LNG having the smallest specific gravity and other types of liquefied gas L having a larger specific gravity than LNG. Here, the same type of liquefied gas L may be mounted on the plurality of tanks 3, or a plurality of types of liquefied gases L may be mounted on the plurality of tanks 3.

As shown in fig. 3, the information processing device 20 is configured by a computer device, and functionally includes: a processing unit 21, an input unit 22, a storage unit 23, a determination unit 24, and an information output unit 25.

The processing unit 21 executes processing for appropriately managing the liquid level of the liquefied gas L stored in the tank 3 according to the type of the liquefied gas L stored in the tank 3 based on a predetermined computer program.

The input unit 22 receives an input of identification information for identifying the type of the liquefied gas L stored in the tank 3 from the outside. The external identification information can be input by an operator selecting the type of the liquefied gas L stored in the tank 3 using a switch or the like, for example. Further, identification information of the liquefied gas L transferred to the tank 3 may be input from the onshore storage facility side input unit 22 that stores the liquefied gas L loaded on the ship 10. For example, the manifold 9B may be provided with liquid type detection means (not shown) for detecting the specific gravity, the component, and the like of the liquefied gas L fed into the tank 3, and the type of the liquefied gas L may be automatically detected and input to the input unit 22.

The storage unit 23 stores a maximum liquid level set value Lm of the tank 3 set for each of the plurality of types of liquefied gases L. When the liquefied gas L stored in the tank 3 is LNG, the maximum level set value Lm is the full level Lx of LNG set for the tank 3 from the time of the existing ship 1. The maximum liquid level set value Lm is set for each of the plurality of types of liquefied gases L in accordance with the specific gravity of the liquefied gas L. The maximum liquid level set value Lm is determined so that the load of the liquefied gas L does not exceed the allowable load of the tank 3 in a state where the liquefied gas L is stored in the tank 3 to the maximum liquid level set value Lm. The allowable load of the tank 3 in the conventional ship 1 is set based on the weight of the liquefied gas L when LNG (having a specific gravity of 0.47 to 0.48) containing methane as a main component is contained at a full liquid level Lx in the tank 3.

For example, the specific gravity of LNG is d0, and the volume of LNG when LNG is stored in the tank 3 at the full liquid level Lx is V0. In this case, the volume V of the liquefied gas L having the specific gravity d equal to the weight of the LNG having the volume V0 is as follows.

V＝(d0/d)×V0…(1)

According to the above formula (1), when the specific gravity d of the liquefied gas L is greater than the specific gravity d0 of the LNG (d > d0), the maximum volume Vm of the liquefied gas L stored in the tank 3 becomes

Vm≤V0。

That is, when another type of liquefied gas L having a higher specific gravity d than the LNG is stored in the tank 3, the maximum liquid level set value Lm of the liquefied gas L is set below the full liquid level Lx when the LNG is stored in the tank 3. The maximum level set value Lm is set for each of a plurality of types of liquefied gases L having different specific gravities (each specific gravity). That is, the storage unit 23 stores a plurality of types of maximum level set values Lm according to the specific gravity of the liquefied gas L. The higher the specific gravity of the liquefied gas L, the lower the maximum level set value Lm is set.

The determination unit 24 determines whether or not the value of the liquid level of the liquefied gas L in the tank 3 input from the liquid level detection unit 8 reaches a maximum liquid level set value Lm corresponding to the type of the liquefied gas L stored in the tank 3.

The information output unit 25 outputs predetermined information to the outside when the value of the liquid level of the liquefied gas L input from the liquid level detection unit 8 reaches the maximum liquid level set value Lm corresponding to the type of the liquefied gas L in the tank 3, based on the determination result of the determination unit 24. Examples of the information output to the outside by the information output unit 25 include an alarm sound for notifying the operator that the liquefied gas L has reached the maximum liquid level set value Lm, lighting of a lamp, and display of character information. Upon recognition of this information, the operator stops the cargo pump (not shown) on the land and stops the supply of the liquefied gas L to the tank 3 by the cargo pump (not shown). Further, as information to be output to the outside by the information output unit 25, there are the following information: when the liquefied gas L reaches the maximum liquid level set value Lm, it is notified to a ship-mounted control System (ESDS: Emergency Shut-Down System), and the control System closes a valve of a cargo piping on the ship to automatically stop the supply of the liquefied gas L to the tank 3.

The reliquefaction device 12 reliquefies the boil-off gas of the liquefied gas L generated in the tank 3 and returns it to the tank 3. In this embodiment, when LNG is stored in the tank 3 as the liquefied gas L, the boil-off gas of LNG can be supplied as the fuel of the main engine 4 by the fuel supply device 7. When the liquefied gas L other than LNG is stored in the tank 3, the boil-off gas of the liquefied gas L is reliquefied by the reliquefier 12 and returned to the tank 3. When LNG is stored in the tank 3, the boil-off gas of LNG may be reliquefied by the reliquefier 12 and returned to the tank 3.

The supply of the boil-off gas of the liquefied gas L in the tank 3 to either the fuel supply device 7 or the reliquefaction device 12 can be automatically controlled by the information processing device 20. In this case, based on the information indicating the type of the liquefied gas L input to the input unit 22 of the information processing device 20, the processing unit 21 issues a command to send the boil-off gas of the liquefied gas L to the fuel supply device 7 when the liquefied gas L is LNG. Further, based on the information indicating the type of the liquefied gas L input to the input unit 22 of the information processing device 20, when the liquefied gas L is any of butane, propane, ethane, and ethylene other than LNG, the processing unit 21 issues a command to send the boil-off gas of the liquefied gas L to the reliquefaction device 12.

Next, a method of loading the liquefied gas L into the tank 3 in the information processing device 20 will be described.

Fig. 4 is a flowchart showing a flow of a method for loading liquefied gas into a tank in the ship.

As shown in fig. 4, the method for loading the liquefied gas L into the tank 3 in the information processing device 20 includes: an identification information input step S1, a gas loading step S2, a liquid level detection step S3, a liquid level determination step S4, a determination result information output step S5, and a gas loading stop step S6.

First, in the identification information input step S1, the input unit 22 receives from the outside an input of identification information for identifying the type of the liquefied gas L stored in the tank 3.

In the gas loading step S2, the liquefied gas L is loaded into the tank 3 from an external land-side storage facility or the like by operating a cargo pump (not shown). The operation of the cargo pump (not shown) may be performed manually by an operator or may be performed automatically by the processing of the processing unit 21.

In the liquid level detection step S3, the liquid level of the liquefied gas L in the tank 3 is detected by the liquid level detection unit 8. The liquid level detection unit 8 outputs the detected value of the liquid level to the processing unit 21.

In the liquid level determining step S4, the determination unit 24 determines whether or not the value of the liquid level of the liquefied gas L in the tank 3 input from the liquid level detecting unit 8 has reached the maximum liquid level set value Lm corresponding to the type of the liquefied gas L stored in the tank 3. The maximum liquid level set value Lm is stored in the storage unit 23. The processing unit 21 calls the maximum liquid level set value Lm stored in the storage unit 23, and notifies the determination unit 24 of the same. The determination unit 24 compares the detection value of the liquid level in the liquid level detection unit 8 with the maximum liquid level set value Lm notified from the processing unit 21. The determination unit 24 notifies the processing unit 21 of information indicating the determination result.

When it is determined in the liquid level determination step S4 that the detected value of the liquid level in the liquid level detection unit 8 has not reached the maximum liquid level set value Lm (no in the liquid level determination step S4), the processing unit 21 returns to the liquid level detection step S3 and repeats the liquid level detection step S3 every predetermined time.

When it is determined in the liquid level determination step S4 that the detected value of the liquid level in the liquid level detection unit 8 has reached the maximum liquid level set value Lm (yes in the liquid level determination step S4), the process proceeds to a determination result information output step S5.

In the determination result information output step S5, the processing unit 21 notifies the information output unit 25 of information indicating that the detected value of the liquid level in the liquid level detection unit 8 has reached the maximum liquid level set value Lm. The information output unit 25 receives a control command from the processing unit 21, and notifies the outside of information indicating that the detected value of the liquid level in the liquid level detecting unit 8 has reached the maximum liquid level set value Lm. After the determination result information output step S5 completes the external output of the information indicating that the detected value of the liquid level in the liquid level detecting unit 8 has reached the maximum liquid level set value Lm, the process proceeds to the gas loading stop step S6.

In the gas loading stop step S6, the cargo pump (not shown) is stopped to stop the loading of the liquefied gas L into the tank 3 from an external land-side storage facility or the like. The stop of the cargo pump (not shown) may be performed manually by an operator or may be performed automatically by the processing of the processing unit 21.

Therefore, according to the ship 10 of the above embodiment, the maximum level set value Lm of the tank 3 is stored for each type of the liquefied gas L stored in the tank 3. The determination unit 24 determines whether or not the liquid level of the liquefied gas L stored in the tank 3 detected by the liquid level detection unit 8 has reached a maximum liquid level set value Lm set in accordance with the type of the liquefied gas L stored in the tank 3. This makes it possible to prevent the liquid level of the liquefied gas L stored in the tank 3 from exceeding the maximum liquid level set value Lm set according to the type of the liquefied gas L stored in the tank 3. Therefore, even when the tank 3 having a capacity set in accordance with the liquefied gas L having a low specific gravity contains the liquefied gas L having a high specific gravity, an excessive load on the liquefied gas L contained in the tank 3 can be suppressed.

As a result, the liquefied gas L can be stored in the tank 3 in an appropriate state and transported regardless of the specific gravity of the liquefied gas L.

The maximum liquid level set value Lm is determined so that the load of the liquefied gas L does not exceed the allowable load of the tank 3 in a state where the liquefied gas L is stored in the tank 3 up to the maximum liquid level set value Lm. Thus, even when the tank 3 having a capacity set in accordance with the liquefied gas L having a low specific gravity contains the liquefied gas L having a high specific gravity, an excessive load on the liquefied gas L contained in the tank 3 can be suppressed. Therefore, the conventional ship 1 including the tank 3 for storing LNG can be effectively used to load the liquefied gas L having a larger specific gravity than the LNG within a range not exceeding the allowable load of the tank 3.

The maximum level set value Lm of the other liquefied gas L having a higher specific gravity than the liquefied gas L having the lowest specific gravity is set below the full level Lx of the tank 3. That is, the liquefied gas L having the lowest specific gravity is stored in the tank 3 until the tank 3 reaches the full liquid level Lx, whereas the liquefied gas L having a higher specific gravity is stored in the tank 3 in a state of being lower than the full liquid level Lx. With this configuration, even when the tank 3 having a capacity set in accordance with the liquefied gas L having a low specific gravity contains the liquefied gas L having a high specific gravity, an excessive load on the liquefied gas L contained in the tank 3 can be suppressed.

The ship 10 further includes an information output unit 25, and the information output unit 25 outputs predetermined information to the outside when the value of the liquid level input from the liquid level detection unit 8 reaches the maximum liquid level set value Lm corresponding to the type of the liquefied gas L in the tank 3 based on the determination result of the determination unit 24. With this configuration, it is possible to output information indicating that the liquefied gas L contained in the tank 3 has reached the maximum liquid level set value Lm set in accordance with the type of the liquefied gas L to the outside. Thus, the operator who performs the operation of storing the liquefied gas L in the tank 3 can recognize that the liquefied gas L is stored in the tank 3 up to the maximum liquid level set value Lm, and automatically stop the storage of the liquefied gas L in the tank 3.

The ship 10 includes: a fuel supply device 7 that takes out the boil-off gas of the liquefied gas L from the tank 3 and supplies the boil-off gas as fuel for the main unit 4 provided in the hull 2; and a reliquefaction device 12 for reliquefying boil-off gas of the liquefied gas L of another type different from the liquefied gas L supplied from the fuel supply device 7 to the main machine 4 and returning the reliquefied gas to the tank 3. With this configuration, when the liquefied gas L stored in the tank 3 is LNG in which boil-off gas can be used as fuel for the main unit 4, the boil-off gas can be supplied as fuel to the main unit 4 by the fuel supply device 7. In the case of the liquefied gas L of a type other than LNG, the boil-off gas can be reliquefied by the reliquefier 12 and returned to the tank 3. This allows the boil-off gas to be appropriately treated according to the type of the liquefied gas L.

The ship 10 is a ship in which at least the hull 2 and the tank 3 are used in the existing ship 1. With this configuration, the conventional ship 1 used as an LNG carrier, for example, can be used to transport liquefied gases other than LNG.

(other modification example)

The present invention is not limited to the above-described embodiments, and includes embodiments obtained by variously changing the above-described embodiments within a scope not departing from the gist of the present invention. That is, the specific shape, structure, and the like described in the embodiments are merely examples, and can be modified as appropriate.

For example, the number of tanks 3 and the shape of the tanks 3 of the conventional ship 1 may be set to any number.

In addition, the tank 3 may contain other loads such as Liquefied Petroleum Gas (LPG) instead of LNG.

In the above embodiment, the tank 3 provided in the conventional ship 1 for storing LNG is stored with another liquefied gas L having a larger specific gravity than LNG, but the present invention is not limited thereto. The tank 3 may contain another liquefied gas L having a smaller specific gravity than the LNG. In this case. Even if other liquefied gas L having a smaller specific gravity than LNG is loaded to the full load level Lx in the tank 3, the load is smaller than in the case of LNG and does not exceed the allowable load of the tank 3.

In the above embodiment, a case where all of the plurality of tanks 3 provided in one ship 10 store the same type of liquefied gas L has been described. However, a plurality of liquefied gases L may be transported simultaneously by the ship 10 including a plurality of tanks 3. In this case, the type of the liquefied gas L may be different for each tank 3.

Industrial applicability

Description of the reference numerals

1 existing vessel

2 hull of ship

2a bow

2b bottom of ship

2h superstructure

2k cargo carrying section

2r stern

2s broadside

2t upper armor plate

3 can

3a upper part

4 host

7 Fuel supply device

8 liquid level detection part

9B manifold

10 vessel

12 reliquefaction device

20 information processing device

21 treatment part

22 input unit

23 storage section

24 judging unit

25 information output unit

Direction of the head and the tail of Da ship

L liquefied gas (load)

Lm maximum liquid level set value

Lx full load liquid level

S1 identification information input process

S2 gas Loading Process

S3 liquid level detection process

S4 liquid level determination step

S5 decision result information output step

S6 gas loading stop process

Volume V

Volume V0

Vm maximum volume.

Claims

1. A ship is provided with:

a hull;

a tank provided in the hull and configured to store a liquid load;

a liquid level detection unit that detects a liquid level of the contents in the tank; and

an information processing device to which a value of the liquid level detected by the liquid level detecting section is input,

the information processing apparatus includes:

a storage unit that stores a maximum level set value of the tank set for each of a plurality of types of the load having different specific gravities; and

and a determination unit that determines whether or not the value of the liquid level input from the liquid level detection unit has reached the maximum liquid level set value corresponding to the type of the load stored in the tank.

2. The vessel according to claim 1, wherein,

in the storage, the maximum level set value set for each kind of the load is determined in such a manner that the load of the load does not exceed the allowable load of the tank in a state where the load is accommodated in the tank to the maximum level set value.

3. The vessel according to claim 1 or 2,

setting a full load level of the tank according to the load having the lowest specific gravity among the plurality of loads loaded to the tank, the highest level setting value of the other loads having higher specific gravity than the load having the lowest specific gravity being set lower than the full load level.

4. The ship according to any one of claims 1 to 3,

the vessel further includes an information output unit configured to output predetermined information to the outside when the determination unit determines that the value of the liquid level input from the liquid level detection unit has reached the maximum liquid level set value corresponding to the type of the load in the tank.

5. The vessel according to any one of claims 1 to 4,

the ship is provided with:

a fuel supply device for taking out the gasified component of the load from the tank and supplying the gasified component as fuel for a propulsion engine provided in the hull; and

a reliquefaction device that reliquefies a vaporized component of the load of another type different from the load supplied to the propulsion engine by the fuel supply device and returns the liquefied component to the tank.