JP2004216917A - Rolling reduction water tank of vessel and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closed anti-rolling water tank capable of eliminating a cause of gas fire (explosion) by safely releasing gas generated in the case of using fuel oil such as A fuel oil as its oil used in the closed anti-rolling water tank by automatic control without troubling a person. <P>SOLUTION: This anti-rolling water tank is doubly used as a fuel tank and an anti-rolling water tank and provided with an air vent pipe 17 with a closing device to be opened only at the time of supplying or transferring fuel oil and a gas vent pipe 12 through the closing device 13 such as a valve free to remote-drive, etc. A lower end of the gas vent pipe is connected to the neighborhood of a tank top part and the other end is connected to the atmospheric air side from a position of the closing device 8 for air vent. The gas vent pipe is provided with a cooling device 39 for the purpose of cooling gas at a proper position. Consequently, a control signal from a control part 25 is output to a gas vent device part 28 in accordance with information detected by a sensor part 21, and gas filled in a tank is made in a lower state than a flash point and released to atmospheric air. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-rolling water tank for reducing the rolling of a ship, and more particularly, to safely and automatically discharge gas generated when a fuel oil such as fuel oil A is used as a liquid for obtaining a damping moment. The present invention relates to a water tank for reducing motion of a ship and a control method thereof.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a U-tube type anti-oscillation tank (hereinafter, also referred to as ART) has been known as a method of reducing the roll of a ship. When the liquid in the left and right wing tanks moves through the liquid duct due to the roll of the ship, the ART causes a time lag with the roll cycle of the ship, that is, a phase delay. By using the delay, the rolling of the ship is reduced.
[0003]
The ART generally includes a pair of at least two wing tanks 2a and 2b set on both sides of the hull, and a liquid connecting the bottoms of the wing tanks to move the liquid 37 in the left-right direction, as shown in FIG. In the liquid duct, there is an air duct 5 communicating with the duct 3 near the upper part of the relative position of the two wing tanks by means of an air duct closing device 6 such as a remote-actuated valve capable of braking the liquid. Is a damper 4 for changing the period of the ART, and furthermore, inside the wing tank, air vents through jammer plates 9a and 9b for adjusting the damping of the liquid and a closing device 8 for an air vent pipe such as a valve necessary only when the liquid is poured and drained. A pipe is provided to constitute the reduced water tank main body 1.
[0004]
By the way, when the closing device for the air duct is closed, the flow of air between the left and right wing tanks is cut off, and the liquid in the tanks is hardly moved, and the ART is inactive.
In this specification, this state is referred to as non-operation.
[0005]
When the ART is used, the above-mentioned non-operation is selected as necessary. To obtain this non-operation state, the inside of the tank needs to be closed, and the liquid in the ART is poured and drained. A closing device 8 such as a valve is provided as an indispensable means to the air vent pipe 7 which is opened only when the air is released.
[0006]
Although not shown in FIG. 3, necessary fittings such as a liquid supply pipe, a liquid drain pipe, a liquid level gauge for checking the liquid level and a sounding pipe which are auxiliary equipment as a water tank are provided. Closing means is applied to all pipes communicating to the outside, such as pipes, liquid drain pipes, and sounding pipes for checking the liquid level, so that the ART is maintained in a sealed state.
[0007]
[Problems to be solved by the invention]
During the operation of the ART, the liquid 37 that obtains the damping moment reverses and reciprocates in the liquid duct 3 at a speed of about 3 to 5 m per second for every sway. As shown in FIG. 5, the state of the liquid is such that the liquid 15 moving in the left and right direction of the ship changes its direction in the wing tanks 2a and 2b in the vertical direction. Although it is not agitated, it is agitated by the internal members and the like, and considerable droplets are generated, and the air 18 repeatedly travels in the air duct 5 with the air 18. However, the liquid generally used is fresh water or seawater, and the closed tank structure is used. But there was no problem. For these reasons, ART has a high anti-rolling effect and has been adopted for various ship types.
[0008]
In particular, pelagic fishing boats have a considerable distance to fishing grounds and require a large amount of fuel oil. Therefore, as a means to secure a little more fuel oil, an ART that can also be used as a fuel tank is desired and commercialized in Japan in 1993. After that, it has been mounted on two or three ships every year. Since about 1999, it has been pointed out that there is a problem in the handling of the air vent pipe when the ART and the fuel tank are combined, which is a domestic law or the operation of the ART.
[0009]
Here, the use of the fuel tank and the air vent pipe of the ART and the difference in the configuration will be briefly described. As a conclusion, the air vent pipe in the case of the fuel tank is always open without providing a closing device, while in the case of the ART, a closing device is provided so that it is always closed except for liquid injection and drainage. It is contradictory.
First, the fuel tank will be described. The general fuel tank 29 shown in FIG. 4 stores an oil amount required during a voyage, and the width of the tank is at most half the width of the ship even if it is large. There are many reasons for this, but it is important to reduce the effect of the free liquid level on the stability of the ship and to suppress the swaying of the fuel 36 during swaying and prevent the fuel oil from being discharged from the air vent pipe 30. Can be From these, a plurality of fuel tanks are arranged to secure an optimal oil amount according to the use and purpose of the ship, and the engine equipment and the individual fuel tanks are connected via transfer means. Each fuel tank is performed via a fuel transfer pipe 33 necessary for refueling or transfer, and air 34 in the tank flows out to the atmosphere at the time of refueling via the air vent pipe 30 and to another tank. When transporting, it flows in from the atmosphere. As a matter of course, the gas 35 generated from the fuel oil 36 is also always spontaneously discharged through the air vent pipe.
[0010]
As an example of the air vent pipe for the fuel tank, assuming that the fuel oil in the fuel tank overflows from the air vent pipe due to overflow at the time of refueling or a large sway of the ship, the air-side end of the air vent pipe is used for overflow. A pipe is connected to the receiving tray 31, the overflowing fuel oil is returned to the fuel tank 29 via a return pipe 32 to the fuel tank, and a means for generating the generated gas 35 is naturally released to the atmosphere. For these reasons, it is stipulated in the ship engine regulations that the fuel tank 29 is provided with an air vent pipe 30 of an open-to-atmosphere type without a closing device, including its diameter.
[0011]
On the other hand, as shown in FIG. 3, the ART constitutes an air vent tube 7 that can shut off the flow of air through a closing device 8 such as a valve. The method of use is to completely close the tank except when pouring or draining a predetermined amount of liquid 37 into the tank. The reason is that, as described above, it is necessary to make the inside of the rocking water tank main body 1 a closed state and maintain that state as a means for liquid braking.
[0012]
From these, as shown in FIG. 5, when the fuel tank and the ART are shared, the following is used. When leaving the port, the ART is filled with fuel oil, and the air vent pipe closing device 8 as a fuel tank is released. When used as an ART, a predetermined amount of fuel in the ART is left, and unnecessary fuel is transferred to another fuel tank. Thereafter, the air vent pipe closing device 8 is closed, so that the inside of the tank can be kept sealed. Configuration. However, a serious problem that did not occur when using clear water or seawater as the liquid to be used, that is, a large amount of gas was generated from the fuel oil, and the internal pressure in the ART did not increase as the gas content increased. I was pointed out by the authorities concerned. Therefore, as a means of releasing this gas, there has been an example of using a method in which the air vent pipe is used in an open state like a fuel tank, but the following problems have been pointed out by the occupants as the results have been accumulated. It became so.
(A) When the air duct is open, the ART cannot be deactivated.
(B) The free liquid level is adversely affected by the ART liquid.
(C) Fuel oil is discharged, causing marine pollution.
(D) Noise is generated from the seawater inflow prevention valve provided in the air vent pipe.
(E) The gas that is forcibly discharged by the movement of the liquid in the tank has a high gas content, and thus has a high risk of ignition.
In response to such a point of view, the air vent pipe was closed and used as in the case of using fresh water or seawater. Incidentally, ART in Japan was first commercialized in 1963, and the total number of installed ARTs to date is about 300. Among them, in 1993, a total of 28 vessels were developed and equipped with fuel tank ARTs, but most of them are sailing with the above-mentioned problems.
[0013]
On the other hand, the grounds pointed out again by the competent authority are that the fuel used by ships is Fuel Oil A, which corresponds to Class 1 or Class 2 specified by JIS (K2205-1991) and has a flash point of 60 C. or more, and when the gas content in the sealed container reaches 1% to 6% and the temperature of the gas is 60 ° C. or more, a fire catches fire. For these reasons, the regulations of the ship engine of the domestic law require the installation of a vent pipe that is always open in the fuel tank, but this has not been observed. In particular, in the ART installed adjacent to the engine room, fuel oil or gas leakage from the valve section for the air duct or the damper section for changing the cycle is concerned, and there is a great possibility that it may cause a fire accident. There is no means for releasing the gas having a large gas content generated in the ART, which is the factor.
[0014]
SUMMARY OF THE INVENTION The present invention provides a water tank for reducing motion of a ship and a control method therefor, characterized in that the gas generated in the sealed ART is safely and automatically discharged to the atmosphere or an overflow tank in order to solve the above-mentioned problems. The purpose is to provide.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, in the ART of the present invention, a gas venting pipe is provided through a gas venting device which enables automatic control, and the gas generated in the tank is released in a safe state.
[0016]
Take measures to satisfy some or all of the following as the release method.
(A) The gas temperature is cooled below the flash point (60 ° C.) and discharged.
(B) Emitted when the roll angle is relatively small.
(C) A vent tube is installed through a closing device such as a valve that enables remote driving, and venting is automatically controlled.
(D) A blower or the like is provided near the discharge port to mix the air and the gas and discharge the gas with a reduced gas content.
(E) The temperature inside the tank or the gas to be discharged is grasped by a temperature controller or the like, and if the temperature is equal to or higher than a preset temperature, the gas venting device is closed or controlled so as not to be released during closing.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
SUMMARY OF THE INVENTION An object of the present invention is to provide a sway reducing tank for a ship and a control method therefor, characterized in that the gas generated in the ART is safely and automatically released to the atmosphere. The control of the natural cycle of the ART and the control of the braking of the liquid by grasping the rolling cycle and the rolling cycle are provided with the related equipment and the control system in the ART according to the present invention. Since there is no relationship, a detailed description thereof will be omitted. Hereinafter, embodiments of the present invention will be described based on examples with reference to the drawings.
[0018]
FIG. 1 is an overall configuration diagram showing a main configuration showing an embodiment of an ART according to the present invention. As shown in FIG. 1, the basic configuration of the ART for achieving the above object is to connect a pair of at least two wing tanks 2a, 2b set on both sides of the hull and the bottom of these wing tanks. A liquid duct 3 for moving the liquid (fuel oil) 15 in the left-right direction, and a closing device 6 such as a remote-driven valve that enables braking of the liquid (fuel oil) near the upper part of the relative position between the two wing tanks. The air duct 5 and the liquid duct communicated with each other through the means, the damper 4 for changing the cycle in the liquid duct, and the closure in the wing tank which is released only when the fuel oil 15 in the ART is supplied or transferred to the jammers 9a and 9b and the ART. An anti-oscillation tank main body 1 that can be used as a fuel tank by providing an air vent pipe 7 and the like with the device is configured.
[0019]
Although not shown, necessary fittings such as a fuel oil supply pipe, a fuel oil transfer pipe, a liquid level gauge for confirming the liquid level and a sounding pipe which are auxiliary equipment as a water tank are provided. In addition, all pipes leading to the outside, such as a fuel oil transfer pipe and a sounding pipe for checking the liquid level, are provided with a closing means to enable a sealed state.
[0020]
Further, a venting pipe 12 is provided via a closing device 13 such as a valve which enables remote driving for venting the gas in the tank, the lower end of which is connected near the top of the tank and the other end is provided with an air venting pipe 7. It connects to the atmosphere side from the position of the closing device 8 such as a valve.
[0021]
As shown in FIG. 6, the degassing device unit calculates and decodes the contents of the information output from the sensor unit 21 and the sensor unit 21 for detecting the information that releases the gas in the tank as necessary, and outputs the control signal. It comprises a control section 25 to be output, a degassing device section 28 for remotely driving a closing device such as a valve with a degassing pipe based on a control signal from the control section, and a degassing pipe.
[0022]
The sensor unit 21 includes a pressure sensor 17, a temperature controller that grasps the temperature in the tank or the temperature of the gas to be discharged and outputs a control signal, a gas concentration sensor 20, and the like, detects the degree of gas generation, and shakes the ship. And outputs the information to the control unit.
[0023]
The control section 25 includes an arithmetic decoding circuit 22 for decoding the contents of information output from some or all of the sensors of the sensor section 21, a control execution circuit 23, and an information processing circuit 24.
[0024]
The arithmetic decoding circuit performs arithmetic decoding based on the data output from the sensor unit, and monitors the presence or absence of gas generation according to specifications input in advance. In addition, the ship's sway condition is always grasped from information such as inclinometers.
[0025]
The control execution circuit outputs a control signal to the degassing device to execute the opening / closing specification of a closing device such as a valve with a gas venting pipe, which is set in advance, based on the result decoded by the arithmetic decoding circuit, and releases the gas. I do.
[0026]
Also, the pressure in the tank due to the liquid is calculated based on the roll angle of the ship, and when the result decoded by the arithmetic decoding circuit exceeds a preset pressure value, it is considered that a large amount of gas has been generated and the gas is vented. There is also a control method of outputting a control signal for executing the opening / closing specification of a closing device such as a valve for use, and controlling the degassing device via a control execution circuit.
[0027]
The gas concentration, tank internal pressure, tank internal temperature or gas temperature, ship fluctuation information, and the operating status of each equipment are grasped by the information processing circuit one by one, and the information is stored in the IC memory and shown in the figure. However, it is also possible to display it on the control panel and send a signal to other navigation equipment as navigation information.
[0028]
The degassing device section 28 includes a closing device 13 such as a drive source 26, an electromagnetic valve 27, and a valve 13 with a degassing tube. Further, in this embodiment, the degassing device is installed on one side, but may be installed on both sides, and the position and the number are not restricted.
[0029]
In the present embodiment, the drive system of the closing device such as a valve with a gas vent tube is configured assuming a hydraulic drive. However, a pneumatic or electric system may be used. May be omitted.
[0030]
In this embodiment as the gas venting device, a valve with a gas venting tube combined with a sensor unit is employed, but an automatic breathing valve or a pressure reducing valve that detects internal pressure and releases gas or the like may be used.
[0031]
It is also possible to abolish a part or all of the sensor unit 21 serving as an information source of the degassing device and control a closing device such as a valve with a degassing tube by a timer. Although less functional than the punching device, this system may be employed in accordance with the specifications of the ship.
[0032]
FIG. 2 shows the ART of FIG. 1 in which the lower end of the degassing pipe 12 is connected to the air duct 5 and installed near the center of the hull as a means for suppressing the fuel oil 15 discharged together with the gas 19. is there. As described above, the lower end of the gas venting pipe may be connected to a location that seems to be optimal due to the space at the location where the gas vent pipe is installed, and is not restricted in position.
[0033]
Further, a cooling device (39) for obtaining a temperature lower than the gas flash point is provided at an appropriate portion of the gas vent pipe. The simplest cooling method includes a method of providing a cooling tank using seawater or miscellaneous water and passing a gas vent pipe into the tank.
Since a ship is equipped with a ballast tank (including a ballast pump) and a miscellaneous water tank (including a miscellaneous water pump), a cooling medium can be easily obtained. The temperature of the liquid in the ballast tank and the miscellaneous water tank is at most about 40 ° C. By using this as a refrigerant, the purpose of the cooling device can be achieved. It is also possible to provide a full-scale cooling device, but it is not necessary to lower the gas temperature beyond the flash point more than necessary. The point is that the temperature of the gas to be released should be lower than the flash point (60 ° C). Therefore, a relatively simple cooling device is sufficient. Therefore, there is no restriction on the type of cooling device or the cooling method.
[0034]
By using a control method for driving the degassing device when the ship's roll angle is relatively gentle, the possibility of fuel gas and fuel oil being discharged from the degassing pipe is minimized.
[0035]
The closing device mounted on the air vent pipe may be changed to a remote drive type, and it may also be used as a gas vent pipe.However, since the diameter of the air vent pipe itself is determined by the rules of the ship engine, it will be expensive such as equipment costs, There is no problem as a means of the device.
[0036]
If the gas to be released is mixed with air by a blower or the like, and the gas is released with a reduced gas content, the danger of ignition is reduced. Therefore, these means may be adopted. Also,
The temperature of the gas to be released is measured. If the temperature exceeds a preset temperature, for example, 55 ° C., the release is stopped instantaneously during the gas release. In addition, in the case of the release preparation stage, if the degassing device is not released, safety can be further secured.
[0037]
【The invention's effect】
As is clear from the above description, according to the present invention, even if fuel oil is used as the liquid for the ART, it is possible to satisfy all the conditions as the fuel tank and the ART. It has the effect of doing.
[0038]
(1) A large amount of gas generated when fuel oil is used can be safely and automatically released to the atmosphere.
(2) Since the gas is released in a calm marine weather situation, the discharge (outflow) of the fuel oil in the ART can be suppressed, and the factor of marine pollution is extremely reduced.
(3) Since the gas to be released has a temperature lower than the flash point by the cooling means, even if a fire is present for some reason in the vicinity of the release point, it is possible to prevent ignition and explosion.
(4) Since the gas is released as required, the pressure in the tank becomes almost the same as the atmospheric pressure, and the problem of fuel oil or gas leakage due to the rise in the tank pressure from the valve for the air duct or the lower duct part for variable period is not caused. To be extremely reduced.
The total number of ARTs equipped with fuel tanks in Japan is 28 ships, and the ship is currently sailing with the above-mentioned problems. According to the present invention, the conditions as fuel tanks and ART It is an invention that can satisfy all of the conditions described above, degassing is performed safely and automatically without any need for human intervention, and an extremely high effect can be expected as a measure to prevent gas fire (explosion). .
[Brief description of the drawings]
FIG. 1 is a general configuration diagram showing a main configuration showing an embodiment of a rocking water tank according to the present invention.
FIG. 2 shows an example of changing the position of a gas vent pipe in the rocking water tank in FIG.
FIG. 3 is an overall configuration diagram showing a main configuration of a general anti-roll tank according to the related art.
FIG. 4 shows a cross section of a fuel tank of the prior art and a system of an air vent pipe.
FIG. 5 shows the movement of a liquid in a fuel tank and a wing tank according to the prior art.
FIG. 6 is a block diagram showing an embodiment relating to a control unit and a control mechanism configuration of a degassing device relating to control of the present invention.
FIG. 7 shows an example of a cooling part of a gas vent pipe of the rocking water tank in FIG.
FIG. 8 shows an example of a cooling location of a gas vent pipe of the rocking water tank in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Anti-oscillation water tank main body 2a, 2b ... Wing tank 3 ... Liquid duct (liquid transfer duct)
4 Lower damper (for changing the tank natural cycle)
5 Air Duct 6 Air Duct Closing Device 7 Air Vent Tube (Air In / Out Tube) 8 Air Vent Tube Closing Device 9a, 9b Jammer Plate 10 Overflow Pan ( tank)
11 ... return pipe to fuel tank 12 ... degassing pipe 13 ... closing device for degassing pipe 14 ... liquid level 15 ... liquid (fuel oil)
16: overflowed fuel oil 17 ... pressure sensor 18 ... air 19 ... gas 20 ... gas concentration sensor 21 ... sensor unit 22 ... calculation decoding circuit 23 ... control execution Circuit 24 ・ ・ ・ Information processing circuit 25 ・ ・ ・ Control part 26 ・ ・ ・ Drive source 27 ・ ・ ・ Electromagnetic valve 28 ・ ・ ・ Gas release device part 29 ・ ・ ・ Fuel tank 30 ・ ・ ・ Air vent pipe 31 ・..Overflow tray 32 ... Return pipe to fuel tank 33 ... Fuel transfer pipe 34 ... Air 35 ... Gas 36 ... Fuel oil 37 ... Liquid 38 ... Swing sensor 39 ···Cooling system

Claims (7)

A pair of at least two wing tanks (2a, 2b) set on both sides of the hull, a liquid duct (3) connecting the bottoms of these wing tanks to move the liquid (15) in the left-right direction, and both wing tanks An air duct (5) communicated through means of a remotely driven air duct closing device (6) that enables the braking of liquid near the upper part of the relative position of the air duct, and a variable frequency cycle in the liquid duct. A damper (4), a jammer plate (9a, 9b) provided in a wing tank, an air bleeding pipe (7) via an air bleeding pipe closing device (8), and a gas (19) in the tank are evacuated. Degassing pipe (12) through a degassing pipe closing device (13) that enables remote driving, a sensor section (21) for detecting the pressure or gas concentration inside the tank, and information output from the sensor section A control unit (25) for decoding the contents and outputting a control signal; and a degassing device (28) for remotely driving the venting tube closing device (13) based on the control signal from the control unit. ), The control unit (25) decodes the information inside the tank output from the sensor unit (21) by the control unit (25) to execute a predetermined control specification,
A water tank for reducing motion of a ship, wherein the degassing device (28) is automatically controlled. A pair of at least two wing tanks (2a, 2b) set on both sides of the hull, a liquid duct (3) connecting the bottoms of these wing tanks to move the liquid (15) in the left-right direction, and both wing tanks An air duct (5) communicating with means of a remotely driven air duct closing device (6) that enables braking of liquid near the upper part of the relative position of the air duct, and a damper for changing the period in the liquid duct. (4), a baffle plate (9a, 9b) provided in the wing tank, an air bleeding pipe (7) via an air bleeding pipe closing device (8), and remote control for the purpose of venting gas (19) in the tank. The gas vent pipe (12) through the gas vent pipe closing device (13) that enables driving, the sensor section (21) for detecting the pressure or gas concentration inside the tank, and the information output from the sensor section A control unit (25) for decoding a control signal and outputting a control signal; and a degassing unit (28) for remotely driving the gas venting pipe closing device (13) based on a control signal from the control unit. And information on the inside of the tank output from the sensor unit (21) in a hermetically damped water tank equipped with a cooling device (39) for obtaining a temperature lower than the gas flash point at an appropriate point of the gas vent pipe. And a control unit (25) for executing predetermined control specifications in accordance with a result of the decoding and automatically controlling the degassing device (28). A pair of at least two wing tanks (2a, 2b) set on both sides of the hull, a liquid duct (3) connecting the bottoms of these wing tanks to move the liquid (15) in the left-right direction, and both wing tanks An air duct (5) communicating with means of a remotely driven air duct closing device (6) that enables braking of liquid near the upper part of the relative position of the air duct, and a damper for changing the period in the liquid duct. (4), a baffle plate (9a, 9b) provided in the wing tank, an air bleeding pipe (7) via an air bleeding pipe closing device (8), and remote control for the purpose of venting gas (19) in the tank. Based on a gas vent pipe (12) via a gas vent pipe closing device (13) enabling driving, a control section (25) having a timer function, and a control signal from the control section, Degassing pipe A ship characterized in that a degassing device is automatically controlled for a preset time in a hermetically damped water tank having a degassing device (28) for remotely driving a closing device (13). The agitation reduction tank. A pair of at least two wing tanks (2a, 2b) set on both sides of the hull, a liquid duct (3) connecting the bottoms of these wing tanks to move the liquid (15) in the left-right direction, and both wing tanks An air duct (5) communicating with means of a remotely driven air duct closing device (6) that enables braking of liquid near the upper part of the relative position of the air duct, and a damper for changing the period in the liquid duct. (4), a baffle plate (9a, 9b) provided in the wing tank, an air bleeding pipe (7) via an air bleeding pipe closing device (8), and remote control for the purpose of venting gas (19) in the tank. Based on a gas vent pipe (12) via a gas vent pipe closing device (13) enabling driving, a control section (25) having a timer function, and a control signal from the control section, Degassing pipe Hermetically damped, equipped with a degassing device (28) for remotely driving the closing device (13) and a cooling device (39) at a suitable point in the degassing pipe to obtain a temperature below the gas flash point. An agitation reducing water tank for a ship, wherein the degassing device is automatically controlled according to a preset time in the water tank. 2. The system according to claim 1, wherein a predetermined control specification is executed based on a result of decoding the content of information output from a part or all of the sensor by the control unit, and the degassing unit is automatically controlled. The method for controlling a water tank for reducing motion of a ship according to any one of claims 2, 3, and 4. 6. The gas discharging apparatus according to claim 1, wherein the degassing device is driven to discharge gas when the average roll angle of the ship is smaller than a preset value. A method for controlling a water tank for reducing the motion of a ship. It is equipped with a temperature controller that measures the temperature in the tank or the temperature of the gas to be discharged and outputs a control signal based on the information, and when the temperature is higher than a preset temperature value, the degassing device (28) 7. The method of controlling a water tank for reducing the motion of a ship according to claim 1, wherein the vehicle is closed or the driving for release is not executed.

Images