JP6067804B1 - Floating structure with liquefied gas storage facility and design method thereof - Google Patents

Abstract

[PROBLEMS] To secure a place where a cargo handling facility, a superstructure and a large-sized fitting can be newly arranged while reducing the danger caused by high-pressure gas leakage in a fuel gas pipe, and not only LNG but also other gases. A floating structure having a liquefied gas storage facility that can be efficiently transported by intra-regional transportation or short-distance transportation and can be loaded and unloaded at a plurality of ports, and a design method thereof. A floating structure 1A having a liquefied gas storage facility having an engine room 5 behind a cargo compartment R1 of a cargo tank 11 formed of a low-temperature liquefied gas tank, the rear of the cargo compartment R1, and In the state where the cargo equipment room 12 is arranged in part or all of the upper side of the engine room 5, the total loading capacity of the cargo tank 11 is 60,000 m 3 or more and 90,000 m 3 or less, and the cargo tank 11 and the cargo hold 10 are sufficient. In addition, the hull structure has sufficient stability for drought and lateral inclination sufficient for navigation. [Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates to a floating structure having a liquefied gas storage facility and a design method thereof, and more specifically, a short-distance transportation or coastal sea that includes a facility for temporarily storing liquefied gas and a cargo equipment room. A liquefied gas carrier, a ship equipped with a liquefied gas fuel tank, a floating structure equipped with a liquefied gas fuel tank, or a medium-sized multi-gas compatible ship suitable for secondary transportation within the region of The present invention relates to a floating structure having a liquefied gas storage facility such as a floating structure having a liquefied gas storage facility, and a design method thereof.

  Of the liquefied gas carriers, the liquefied natural gas carriers (LNG ships) use fuel gas piping from the cargo equipment room to the side of the residential area in order to use the evaporated gas generated by natural evaporation of the natural gas as cargo. The evaporative gas is led to the main engine in the engine room provided behind the cargo compartment.

  Recently, with regard to the fuel utilization of this evaporative gas, a technique using a low speed diesel engine of a dual fuel as a main engine of an LNG ship has been attracting attention. In this case, the natural gas used as the fuel is reduced to about 300 bar to 400 bar. It is necessary to increase the pressure and supply it to the main engine. Therefore, in the conventional ship arrangement, high-pressure piping is laid from the fuel supply device installed in the cargo equipment room far away from the engine room to the engine room.

  Therefore, if a steam turbine is used for the main engine as in a conventional ship, even if natural gas is used as the fuel, the pressure of the natural gas supplied to the boiler can be low. Even if the piping is damaged, the risk of this natural gas leakage should have been considered only the risk of a gas explosion, but if a high-pressure natural gas leaks, in addition to the risk of a gas explosion, There is also concern about crew injuries caused by the eruption.

  As countermeasures against this gas leakage, since the fuel gas piping is provided with a cover or when the fuel gas piping is installed in the same exposure state as before, stricter anti-corrosion measures are required. Not only will it be difficult to achieve, but it will also increase the cost of the ship.

  In addition, it is necessary to use large electrical equipment as equipment for increasing the pressure of liquefied gas such as natural gas. Therefore, it is necessary to add electrical wiring for power supply to the large electrical equipment. Installation is difficult and costly.

  Further, in order to provide a large electric device for increasing the pressure of the liquefied gas, an installation space in the cargo equipment room is required, and the cargo equipment room needs to be expanded. In addition, in order to be able to enter and leave multiple ports, it has become necessary to provide new cargo handling equipment, new superstructures for different uses, and new large equipment in addition to conventional ship equipment. Yes.

  However, in the MOSS type LNG ship, the upper side of the spherical cargo tank protrudes greatly on the upper deck, so there are few places where equipment can be freely installed on the upper deck, and the cargo equipment room, cargo handling manifold (piping) The place for installing cargo handling equipment such as a connecting manifold) and other large-sized fittings is limited on the upper deck, and the installation place is limited.

  In conventional liquefied gas carriers, the cargo equipment room is rarely placed in front of the hold space, which is the liquefied gas storage facility at the foremost end of the bow, in small ships. 12 and FIG. 13, the cargo equipment room 12 of the liquefied gas carrier 1X is provided between the cargo tanks 11 so as not to unnecessarily widen the cargo compartment R1 for which explosion-proof measures are required. Yes. In addition, a cargo handling manifold 13 is provided between the cargo tanks 11 in the cargo section R1, and the residence section 8 and the engine room 5 are provided at the rear of the cargo section R1.

  Also, as an example of this, in the case of an LNG ship equipped with a MOSS type spherical cargo tank, the cargo machine room (cargo equipment room) is placed on the upper deck of the cargo compartment, and the last cargo tank and its front An LNG ship provided between a cargo tank and a loading manifold (manifold for cargo handling) between the front cargo tank and the front cargo tank is illustrated (see, for example, Patent Document 1). .

  For this reason, if an attempt is made to provide a cargo equipment room larger than the conventional ship on the upper deck in front of or behind the cargo section while maintaining the arrangement of providing the residential area on the engine room of the conventional ship, at least this Since it is necessary to increase the length of the LNG ship by the length of the cargo equipment room, the price of the LNG ship will increase significantly.

  In addition, regarding the location of the cargo handling manifold, if the port is limited to some extent, the installation location is often limited to one location, so the cargo equipment room, the cargo handling manifold and the ladder are installed between the cargo tanks. However, when the port cannot be limited, it becomes necessary to provide a plurality of cargo handling manifolds, and securing the installation location becomes important. In addition, when the number of cargo tanks decreases, the number of places where the cargo tanks can be installed is reduced.

On the other hand, LNG ships carrying LNG (liquefied natural gas) are becoming larger and larger, but it is expected that the number of large LNG ships will increase in the future. In the transport of LNG, the main component of LNG is methane (CH ₄ ), the pressure during transport in the liquid state of LNG is atmospheric pressure, the temperature is minus 162 ° C., and the liquid specific gravity of the main component of methane is Is 0.43, but the liquid specific gravity is 0.43 to 0.48 due to the compositional component ratio of LNG. Therefore, a heat insulating structure such as a heat insulating layer is provided to keep the tank at a low temperature. Moreover, since the specific gravity of liquefied natural gas is very light at 0.5 or less, the tank volume is large for the hull.

  In recent years, ship transportation of LNG has become necessary for short-distance transportation by ship and secondary transportation in the coastal area. In particular, LNG receiving land tanks in Japan have sizes ranging from 60,000 cubic meters to 90,000. There are a lot of standing rice, and in response to this, there are actually medium-sized LNG ships of 60,000 to 90,000 square meters, but the membrane type LNG ships are mainly in service. is there.

  However, this membrane-type tank is vulnerable to sloshing, and is not allowed to operate in a semi-loading state where sloshing is a concern. The medium-scale liquefaction of 60,000 to 90,000 square meters used for short-distance transportation such as secondary transportation within the region is not possible. There is a problem that it is not suitable for gas transport ships.

As an anti-sloshing measure, the adoption of a MOSS type low temperature liquefied gas tank is conceivable and the transport scale is not described, but an LNG ship having 3 to 5 MOSS type low temperature liquefied gas tanks is disclosed (for example, (See paragraph [0004] of Patent Document 2)
On the other hand, there are cases where medium-scale liquefied gas transportation is carried out exclusively for LNG, but in recent years, not only LNG but also ethane (C ₂ H ₆ ) and ethylene (C ₂ H ₄ ) are used for applications. It is coming. Therefore, it has been required from the aspect of efficient use of liquefied gas transport ships that ethane and ethylene can be transported in addition to transport of LNG and LPG.

  However, with regard to LPG (liquefied petroleum gas), there is a track record of the same medium-sized LPG ship, and ethylene has a track record of operating an ethylene ship with an ethylene loading weight of 3,500 tons, but depending on the situation, LNG, LPG A medium-sized liquefied gas transport ship that can carry and transport multigas such as ethane and ethylene on the same liquefied gas transport ship has not yet been manufactured.

  This LPG is a gas fuel containing propane, butane or the like as a main component and is liquefied at a relatively high temperature even under atmospheric pressure, is heavier than LNG, and has a larger amount of heat per unit volume than LNG. For example, under atmospheric pressure (about 1.0 atm), butane liquefies at minus 0.5 ° C. to minus 11.7 ° C., and propane liquefies at minus 42.1 ° C.

  Ethane is a component of natural gas that is the second most abundant component of methane, and is also obtained from petroleum gas as a by-product during oil production. The boiling point of ethane is minus 89 ° C. at normal pressure, and the specific gravity of the liquid is 0.55. The boiling point of ethylene is minus 104 ° C. at normal pressure, and the specific gravity during transportation is 0.57. The temperature and pressure during transportation of this ethylene in a liquid state are minus 104 ° C. and 0.1 MPa (about 1.0 atm).

  If this ethylene is to be mounted on an LNG ship as it is, the temperature during transportation is minus 104 ° C for LNG in terms of heat protection, and minus 104 ° C for ethylene, and the pressure during transportation is both LNG and ethylene. Since it is normally atmospheric pressure, both temperature management and pressure management are sufficient, but ethylene has a liquid specific gravity of 0.57 or less compared to a liquid specific gravity of 0.5 or less during LNG transportation. Insufficient to mount and transport.

  In addition, due to the difference in liquid specific gravity, if it is installed as it is, the center of gravity of the entire ship at the time of transportation rises, and the restoration performance (stability) related to the lateral inclination necessary for operation will be insufficient. In other words, the LNG carrier can not transport ethylene and the like, and there is a problem that it is difficult to use it as a medium-scale liquefied gas carrier with many opportunities to transport many types of multi-gas.

  As for the design method for the liquefied gas transport ship, for example, when designing a MOSS type liquefied gas transport ship dedicated for LNG, the hull width should always be the same and the LNG tank thermal insulation can be equipped. The tank diameter is determined, but when designing a liquefied gas carrier dedicated to ethane, the tank diameter is increased to maximize the tank volume by reducing the heat insulation thickness. In addition, in order to maximize the tank volume, the liquefied gas that transports the liquefied gas for each special type, such as extending the equator of the MOSS type spherical tank to maximize it as long as the ship's stability allows. When designing a transport ship, it is designed according to the characteristics of the dedicated liquefied gas, so in the case of multi cargo such as LNG / LPG / ethane / ethylene, which liquefied gas each design item corresponds to. Deciding is a big issue.

  Also, as a general rule, since the cargo equipment room cannot be located with the residential area, this cargo equipment room is usually located between the cargo tanks on the upper deck because it is located in the cargo compartment. The Therefore, when there are few cargo tanks, the place where the cargo equipment room can be placed becomes the place between them, and when one of those places is occupied by the cargo equipment room, the placement of the cargo handling manifold is also on the same upper deck. Therefore, there is a problem in that the placement location of the cargo handling manifold is limited to the remaining locations, and the degree of freedom in placement is completely eliminated.

JP-A-7-301372 (paragraphs [0002] and [0025], FIG. 5) Japanese Patent Laid-Open No. 6-123569

  The present invention has been made in view of the above situation, and its object is to reduce the risk of leakage of high-pressure gas from high-pressure fuel gas piping in a floating structure equipped with a liquefied gas storage facility. , New cargo handling facilities, new ship towers, new large-scale equipment can be added and secured, and multi-gas such as LPG, ethane, ethylene, etc., as well as LNG, can be transported in the region or within short distances. It is an object of the present invention to provide a floating structure having a liquefied gas storage facility capable of transporting liquefied gas efficiently and capable of loading and unloading at a plurality of ports, and a design method thereof.

In order to achieve the above object, a floating structure provided with a liquefied gas storage facility of the present invention includes a cargo compartment equipped with a cargo tank formed of a MOSS type low-temperature liquefied gas tank, and the cargo compartment. A floating structure having a liquefied gas storage facility having an engine room behind and a part or all of a residential area provided on the upper deck, behind the cargo compartment, and With the cargo equipment room arranged partly or entirely above the engine room, the total capacity of the cargo tank is 60,000 m ³ or more and 90,000 m ³ or less, and the structural strength of the cargo tank and the cargo The structural strength of the cargo hold where the tank is mounted is the structural strength that allows mounting of LNG, ethane, ethylene, or LPG, and the hull structure has LNG mounted on all of the cargo tanks. When ethane, ethylene, or LPG is mounted on all of the cargo tanks, or when three or more of LNG, ethane, ethylene, and LPG are mixedly loaded on the cargo tank, sufficient for navigation when operating. It is characterized by its restoration performance against dry ridges and lateral slopes.

  It should be noted that the cargo equipment room is arranged at a part or all of the upper side of the engine room when a part of the ceiling of the engine room becomes the floor of the cargo equipment room and when the whole ceiling of the engine room is the floor of the cargo equipment room. Shows the case.

  According to the configuration in which the cargo equipment room is arranged in a part or all of the upper side of the engine room, the following effects can be obtained. That is, as a general rule, the cargo equipment room cannot be placed with the residential area, so this cargo equipment room is usually placed in the cargo compartment and between the cargo tanks on the upper deck. . Therefore, when there are three cargo tanks, the cargo equipment room can be placed in two places in the front-rear direction, and if one of them is occupied by the cargo equipment room, the cargo handling manifold ( (Pipe connection manifold) must also be placed between the cargo tanks on the same upper deck, so the placement location of this cargo handling manifold is limited to the remaining one, and there is absolutely no freedom of placement. There is a problem that it is not possible to handle cargo handling equipment at the port of destination, but by placing the cargo equipment room on the upper side of the engine room, there are two places where the cargo handling manifold can be placed, There is an effect that the degree of freedom of the location of the cargo handling manifold occurs, and the handling of the cargo handling equipment at the port becomes easy.

  In addition, the cargo equipment room where the equipment for transporting the fuel gas was stored was moved from between the cargo tanks directly above the engine room where the main engine and power generation equipment that uses the fuel gas were placed. The fuel gas piping provided to use liquefied gas as fuel as a fuel is not only configured to lead out from the cargo equipment room to the engine room directly below, but also from the cargo equipment room to the engine room directly below it. It is also possible to adopt a configuration that leads immediately.

  As a result, the laying length of the high-pressure fuel gas piping from the cargo equipment room to the main engine in the engine room can be shortened, so that the possibility of fuel gas leakage is reduced, and explosion due to leakage of high-pressure fuel gas and Injuries and dangers to the human body can be reduced. In addition, the range of anticorrosion measures is reduced, and it is easy to install electric wires such as power supply wires.

  In addition, because the high-pressure fuel gas piping does not pass next to the residential area, dangerous gas can enter the residential area and explode when gas leaks, or high-pressure fuel gas can directly injure the crew. The possibility of doing so can be significantly reduced.

  At the same time, it is not necessary to secure a space for the cargo equipment room between the cargo tanks, so that it is possible to install other equipment between the cargo tanks, additional cargo handling equipment such as an additional cargo handling manifold, It will be possible to secure a place to install an additional superstructure for another use and an additional large-sized fitting.

  In addition, since the cargo machine room is located in the narrow space between the cargo tanks, this configuration compared to the conventional technology in which the first floor part of the cargo machine room has a three-story structure as a passage space to the front and rear. Because the cargo machine room is located on the engine room, the full width of the deck can be used. Therefore, it is possible to suppress the installation height by securing a passage space to the left and right, and to reduce the installation pressure by using a 1st to 2nd floor structure, thereby reducing the wind pressure resistance and lowering the center of gravity.

Furthermore, according to this configuration, since the total loading capacity of the cargo tank is set to 60,000 m ³ or more and 90,000 m ³ or less, the medium-sized liquefied gas transport ship can achieve the efficiency of medium-sized and short-distance transportation of liquefied gas. Can be achieved.

  In addition, since a MOSS type cargo tank that is less likely to cause sloshing and can be transported in a semi-mounted state is mounted, the use of this MOSS type cargo tank can solve the problem of sloshing caused by liquefied gas liquid. As a result, the liquefied gas transport ship of the membrane type tank according to the prior art can be operated in a semi-loading state that cannot be performed due to sloshing, and a small amount can be unloaded at a plurality of ports.

  With regard to the heat insulation structure of this cargo tank, by adopting a heat insulation structure for LNG that can accommodate a temperature of minus 162 ° C. during transportation, it becomes an effective heat insulation structure for ethylene having a temperature of minus 104 ° C. during transportation. .

  Also, especially when mixed loading is possible, the structural strength of this cargo tank is a large factor in the liquid specific gravity during transportation, so the larger ethane of the liquid specific gravity during transportation of LNG and ethane or ethylene. It should have sufficient structural strength with respect to the liquid specific gravity of 0.55 or the liquid specific gravity of ethylene of 0.57. Moreover, it is set as the intensity | strength which can respond also to the full load state and semi-load state of LNG and ethane or ethylene from which liquid specific gravity differs. As a result, both LNG and ethane or ethylene can be mounted and transported in this cargo tank, and the conditions for pressure, boiling point and specific gravity during transportation can be eased or equivalent LPG can be the same. It will be possible to mount and transport each using the method.

  In addition, the strength of the hull that sails with the cargo tank supported is sufficient to support LNG in terms of temperature, and it supports the cargo tank sufficiently even when ethane or ethylene or LPG with a large specific gravity is mounted. It should be strong enough to sail under the condition.

  As for the hull, even when LNG with a relatively low specific gravity is installed, the draft required for navigation can be secured, and even when ethane or ethylene or LPG with a relatively high specific gravity is installed, In addition to ensuring dredging and stability (stability), even when multiple LNG, ethane, ethylene, and LPG with different specific gravity are mixed, drought and stability are secured, and the hull trim (vertical inclination) is secured. Make trim suitable for navigation. These are sufficiently possible within the range of the prior art by securing the capacity of the ballast water tank and setting the arrangement and hull shape of the ballast water tank.

By combination of these cargo tanks, LNG thermal insulation structure, structural strength of tanks for LNG or ethane or ethylene or LPG, and structural strength of cargo hold, LNG, ethane, ethylene, LPG, and multiple hull structures that can be loaded together. This is a floating structure equipped with a liquefied gas storage facility capable of mounting a medium-sized multigas whose total loading capacity of the cargo tank is 60,000 m ³ or more and 90,000 m ³ or less.

In other words, ensuring transport scale, cargo tank, structural strength of cargo tanks and cargo holds for multi-gas, structural strength of cargo holds, structural strength of hull structures for multi-gas, and ensuring drought and restoration performance during multi-gas navigation Medium-sized liquefied gas transporting liquefied gas of 60,000 m ³ or more and 90,000 m ³ or less, capable of efficiently transporting medium-sized liquefied gas and loading and unloading at multiple ports A floating structure provided with a liquefied gas storage facility that can be engaged in transportation can be provided.

  In other words, the floating structure equipped with this liquefied gas storage facility transports low-temperature liquefied gases such as LNG, ethane, ethylene, and LPG, and can also be used as a dedicated ship for each liquefied gas. And it becomes a structure which can respond also to using it also as a multi-gas carrier which can change a load according to the use of liquefied gas by providing a liquefying apparatus and a gas processing apparatus permanently or adding as needed.

  In the floating structure provided with the liquefied gas storage facility having the above-described configuration, the cargo tank has a thermal insulation structure for cargo. This cargo thermal insulation structure is a thermal insulation structure that can handle cargo with the lowest transport temperature among the cargo to be loaded.

In the floating structure provided with the liquefied gas storage facility having the above-described configuration, the number of cargo tanks is 3 and the tank volume per unit is 20,000 m ³ or more and 30,000 m ³ or less. It is possible to navigate with a small amount of unloading at the consuming area for medium-scale transportation, while maintaining high transportation efficiency with three units.

  In the floating structure provided with the liquefied gas storage facility having the above-described structure, a cargo handling manifold capable of connecting piping on the side of the cargo handling facility on land or offshore to one, some or all of the cargo tanks. When the is arranged, the consistency with the onshore or offshore cargo handling equipment side can be increased.

  In the floating structure provided with the above liquefied gas storage facility, when the fore tower including the navigation bridge arranged in front of the cargo section or the residential area is provided, the cargo tank is a spherical MOSS type tank. As in the case of the formation, it becomes possible to easily secure a front view which becomes a problem in the floating structure in which the large structure projects on the upper deck.

  According to this configuration, since the voyage bridge is arranged in front of the foremost cargo tank, the tall cargo tank does not interfere with the forward view from the voyage bridge, and the forward visibility can be ensured and the maneuverability is improved. Can be improved.

  In addition, from the perspective of this forward view, the height of the navigation bridge can be reduced compared to the case where the navigation bridge is arranged on the stern side, and even if some residential areas are arranged on the stern side, The height of the entire ship can be kept low because there is no need to increase the ward. As a result, since the air draft is reduced, the range in which the floating structure equipped with the liquefied gas storage facility can be navigated increases, and the versatility of the floating structure equipped with the liquefied gas storage facility can be enhanced. For example, when the air draft is lowered, it becomes possible to enter two or more important ports (for example, Montart port in France, Everett port in the United States, etc.).

  In this case, it is preferable to provide the navigation bridge at the uppermost part of the bow tower because a wide forward view can be secured. In addition, it is preferable to install a radar at the upper part of the bow tower, because vibration is smaller than that provided at the upper part of the stern side, which is above the engine room and is susceptible to vibrations, and it is easy to take anti-vibration measures. It also solves the problem of imitation.

  Further, in the floating structure provided with the above liquefied gas storage facility, a bow tower including a navigation bridge disposed in front of the cargo section, a navigation bridge and no navigation bridge, and behind the cargo equipment room When the residential area to be arranged is provided, with the movement of the cargo equipment room between the cargo tanks, a relatively simple layout change can be made by moving the residential area to the rear of the cargo equipment room. It will be. In particular, when there is no place to provide a residential area at the bow, it is possible to arrange the residential area without increasing the length of the ship. This arrangement is effective when it is not possible to secure the installation location of the cargo equipment room on the upper deck of the cargo compartment, and it is also impossible to secure the installation location of the residential district at the bow.

  Furthermore, since the residential area provided above the engine room on the stern side does not have a navigation bridge, the height of this residential area can be reduced, so that the vibration of this residential area is reduced, thereby preventing vibration. This eliminates the need for a steel material, and can increase the amount of load. Furthermore, since the height of the residential area is reduced, the influence of wind pressure during mooring is reduced, so that the mooring equipment can be made smaller and the amount of the loaded load can be increased accordingly. In addition, since the height of the chimney is also reduced, the material used for the chimney can be reduced, and the amount of loaded load can be increased accordingly.

  For example, in a trial design for an LNG ship having a loading weight of about 70,000 DWT, the steel material can be reduced by about 100 t by eliminating the need for a vibration-proofing steel material. Moreover, the material used for the chimney can be reduced by about 10 t.

  Furthermore, in the floating structure provided with the above liquefied gas storage facility, a section in which any one or more of a cofer dam, a void, a fuel oil tank, and a water tank are disposed behind the cargo equipment room. If the residential area is arranged behind the compartment, the cargo equipment room and the residential area do not have to be adjacent to each other due to the interposition of the compartment. The risk of the leaked gas entering the ward can be reduced.

  Or, in the floating structure provided with the above-mentioned liquefied gas storage facility, an engine room protruding portion is disposed behind the cargo equipment room, with a part of the engine room protruding above the upper deck. If the residential area is arranged behind the engine room protruding portion, the cargo equipment room and the residential area need not be adjacent to each other due to the intervention of the engine room protruding portion. Even if this occurs, the risk of the leaked gas entering the residential area can be reduced.

  Or the floating structure provided with said liquefied gas storage equipment WHEREIN: The division which has arrange | positioned either the machine room used as the division different from the said engine room, or a warehouse behind the said cargo equipment room, or both If the residential area is arranged behind the compartment, the cargo equipment room and the residential area do not have to be adjacent to each other due to the interposition of the compartment. The risk of the leaked gas entering the ward can be reduced. In this machine room, an air conditioner (air conditioner), hydraulic equipment, and the like are arranged.

  In the floating structure provided with the above liquefied gas storage facility, a cofer dam, a void, a fuel oil tank, a water tank, a fuel oil transfer pump, a ballast pump, If a section having any one or more of the ballast water treatment devices is arranged, a gap can be provided between the engine room and the cargo section, and the fuel gas piping from the cargo equipment room is connected to this section. Accordingly, even when a gas leak occurs in the cargo equipment room, the risk of the leaked gas entering the engine room can be reduced.

  Alternatively, in the floating structure provided with the above-described liquefied gas storage facility, any one or more of a cofferdam, a void, a fuel oil tank, and a water tank may be provided below the cargo equipment room and above the engine room. If a section is installed, a gap can be provided between the cargo equipment room and the engine room, so even if a gas leak occurs in the cargo equipment room, the leak has occurred in the engine room. The risk of gas intrusion can be reduced.

  In the floating structure provided with the above liquefied gas storage facility, if a flange or valve of a fuel gas pipe led to the main engine is arranged inside the cargo equipment room, the portion of the flange where the fuel gas is likely to leak Because the valve and valve are housed inside the cargo equipment room, reduce the risk of fuel gas leaking into the engine room and the risk of fuel gas leaking from the exposed piping that connects the cargo equipment room to the engine room. Can do.

  And as a floating body structure provided with the above-mentioned liquefied gas storage equipment, a liquefied gas carrier ship equipped with a liquefied gas storage equipment, a ship using liquefied gas as a fuel, a liquefied gas carrier ship having a regasifier, a floating gas liquefaction Either one of equipment or floating regasification equipment can be assumed.

A design method for a floating structure equipped with a liquefied gas storage facility for achieving the above-described object includes a cargo compartment equipped with a cargo tank formed of a MOSS type low-temperature liquefied gas tank, and a rear of the cargo compartment. A design method of a floating structure having a liquefied gas storage facility, having an engine room and having part or all of a residential area on an upper deck, wherein the total loading volume of the cargo tank is 60, 000M ³ above 90,000M ³ as well as below, the tank design step of designing to the structural strength of the cargo hold for mounting the structural strength and the cargo tanks of the cargo tank structural strength against LNG or ethane or ethylene or LPG, When hull structure is loaded with LNG in all of the cargo tanks, ethane or ethylene or LPG is loaded in all of the cargo tanks, Or a hull design process designed so that the cargo tank can be operated in three cases where a plurality of LNG, ethane, ethylene, and LPG are mixedly loaded in the cargo tank, and behind the cargo compartment, and in the engine room A design method for a floating structure having a liquefied gas storage facility, characterized in that it has a room arrangement design step of arranging a cargo equipment room on a part or all of the upper side of the container.

  In other words, especially when mixed loading is possible, MOSS type cargo tanks can satisfy LNG's extreme low temperature compatibility and can also accommodate high specific gravity ethane or ethylene or LPG stacking. Designed to handle heat shrinkage and high loads. This liquefied gas transport ship transports low-temperature liquefied gas such as LNG, ethane, ethylene, LPG, etc., and can be used as a dedicated ship for each liquefied gas, and if necessary, a liquefying device, By providing an additional gas processing device, it becomes a configuration that can be used as a multi-gas carrier that can change the load according to the type of liquefied gas.

  In the above-described method for designing a floating structure having a liquefied gas storage facility, in the tank design process, the heat-proof specification of the cargo tank is designed as the heat-proof specification for the cargo having the lowest transport temperature among the cargoes to be loaded. Configure.

In the above-described method for designing a floating structure having a liquefied gas storage facility, the tank design process includes three cargo tanks mounted and a tank volume per unit of 20,000 m ³ or more and 30,000 m ^3. If it is configured to include a tank volume determination step for designing the cargo tank as follows, the number of tanks is set to three and high transportation efficiency is maintained, and a small amount of unloading at a consumption area during medium-scale transportation is efficiently performed. It is possible to efficiently design a liquefied gas transport ship that can go and navigate.

Method of designing a floating structure having the above-described liquefied gas storage facility, the hull design process, remove the cargo tank of an existing LNG carrier having a cargo tank 125,000M ³ or more 135,000M ³ or less If it is configured to include an existing tank utilization process that is designed to fit the cargo tank of the existing LNG ship on the premise that it will be installed, there is no need to design a MOSS type cargo tank anew, and it is efficient Floating structures with liquefied gas storage facilities can be designed.

  In the above-described method for designing a floating structure equipped with a liquefied gas storage facility, a cargo handling manifold for connecting piping on land or on the ocean to the cargo handling facility side is disposed on one, some, or all of the cargo tanks. If it is configured to have a tank peripheral design process, it will be installed in a 1st or 2nd floor structure with a cargo handling manifold with increased consistency with the onshore or offshore cargo handling facility side, and passage space on the left and right. Therefore, it is possible to efficiently design a floating structure including a liquefied gas storage facility including a cargo machine room with reduced wind pressure resistance and a lowered center of gravity.

  According to the floating structure having the liquefied gas storage facility of the present invention and the design method thereof, the cargo equipment room is located between the cargo tanks at the end of the cargo tank by arranging the cargo equipment room above the engine room. In the high-pressure fuel gas piping from the cargo equipment room to the main engine of the engine room, which is used to use liquefied gas such as natural gas as fuel, the installation length is shortened. Therefore, the danger due to leakage of high-pressure gas can be reduced.

  At the same time, the arrangement of the cargo equipment room between the cargo tanks of the prior art moves the cargo equipment room to the rear of the cargo compartment, and in the configuration of the present invention, the restriction that the cargo equipment room is accommodated in the space between the cargo tanks. And the cargo equipment room can be enlarged, and the space for the cargo equipment room between the cargo tanks is vacant, so additional cargo handling equipment such as an additional cargo handling manifold, an additional superstructure, and an additional large size It becomes possible to secure a place to install the fittings.

  In addition, since the voyage bridge is located in front of the liquefied gas tank at the forefront, the tall liquefied gas tank will not interfere with the forward view from the voyage bridge, ensuring a good forward view and improving the maneuverability. it can.

  In addition to LNG, liquefied gas storage facilities that can efficiently transport liquefied gas, such as ethane or ethylene, by LNG or short-distance transportation, and can be loaded and unloaded at multiple ports. It is possible to provide a floating structure provided with.

It is a side view which shows typically the structure of the liquefied gas carrier ship (exemplification as one of the floating structures provided with the liquefied gas storage equipment) of 1st Embodiment which concerns on this invention. It is a top view which shows typically the structure of the liquefied gas carrier ship of FIG. It is a side view which shows typically the structure of the liquefied gas carrier ship of 2nd Embodiment which concerns on this invention. It is a top view which shows typically the structure of the liquefied gas carrier ship of FIG. It is a side view which shows typically the structure of the liquefied gas carrier ship of 3rd Embodiment which concerns on this invention. It is a top view which shows typically the structure of the liquefied gas carrier ship of FIG. It is a side view which shows typically the structure of the liquefied gas carrier ship of 4th Embodiment concerning this invention. It is a top view which shows typically the structure of the liquefied gas carrier ship of FIG. It is a side view which shows typically the structure of the liquefied gas carrier ship of 5th Embodiment concerning this invention. It is a top view which shows typically the structure of the liquefied gas carrier ship of FIG. It is a figure which shows typically the structure of the design method of the floating body structure provided with the liquefied gas storage equipment of embodiment which concerns on this invention. It is a side view which shows typically the structure of the liquefied gas carrier ship of a prior art. It is a top view which shows typically the structure of the liquefied gas carrier ship of FIG.

  Hereinafter, a floating structure provided with a liquefied gas storage facility according to an embodiment of the present invention and a design method thereof will be described with reference to the drawings. As the floating structure equipped with this liquefied gas storage facility, a liquefied gas carrier ship, a ship equipped with a liquefied gas fuel tank, a floating structure equipped with a liquefied gas fuel tank, a floating structure having a liquefied gas storage facility, etc. However, here, a liquefied gas carrier ship having a cargo tank formed of a MOSS-type spherical low-temperature liquefied gas tank will be described as an example of a floating structure having a liquefied gas storage facility.

  However, the present invention is not limited to this liquefied gas carrier ship, but other liquefied gas carrier ships, ships equipped with liquefied gas fuel tanks, floating structures equipped with liquefied gas fuel tanks, or floating bodies having liquefied gas storage facilities The present invention can also be applied to a floating structure equipped with a liquefied gas storage facility such as a structure.

  In the case where the floating structure equipped with the liquefied gas storage facility is a liquefied gas carrier ship, a ship using liquefied gas as a fuel, or a ship equipped with a liquefied gas fuel tank, it normally sails. If the floating structure with storage facilities is a floating structure with a liquefied gas fuel tank or a floating structure with liquefied gas storage facilities, sail by self-navigation only when going to the offshore installation location. It will be.

  In the present invention, the liquefied gas tank and the liquefied gas fuel tank are cargo tanks formed of MOSS type spherical low-temperature liquefied gas tanks. In the following, the structural strength is described for ethylene. However, even when ethane is targeted, the present invention can be applied by replacing the liquid specific gravity from 0.57 of ethylene to 0.55 of ethane. Furthermore, the present invention can also be applied to other low-temperature liquefied gases containing LPG if the proper boiling point and specific gravity are corrected.

  For heat protection, LNG is targeted, but even if ethylene is the target cargo with the lowest transportation temperature among the planned cargoes to be loaded, the transportation temperature is changed from minus 162 ° C for LNG to minus 104 ° C for ethylene. The invention can be applied. Furthermore, the present invention can be applied to other low-temperature liquefied gases including LPG if the appropriate transport temperature is corrected.

  As shown in FIGS. 1 and 2, the liquefied gas carrier ship 1A according to the first embodiment of the present invention is surrounded by a ship bottom 2, a ship side 3, and an upper deck 4, A cargo compartment R1 having a tank 11 and an engine room 5 for housing a main engine (not shown) and auxiliary equipment are arranged behind the cargo compartment R1, in other words, on the stern side of the hull. And the propeller 6 for navigation is arrange | positioned at the propeller shaft extended back from this engine room 5, and the rudder 7 is arrange | positioned behind it.

  In addition, a part or all of the residential area 8 provided with the navigation bridge 8a (all in the configuration of FIGS. 1 and 2) is provided on the upper deck 4 of the bow. Further, a chimney 9 for releasing exhaust gas generated by the engine in the engine room 5 into the atmosphere is provided on the stern engine room 5.

  In the cargo compartment R1 in front of the engine room 5, a cargo tank 11 is disposed in a double bottom cargo hold 10 provided with a cargo hold bottom plate 2a on the ship bottom 2 in order to store liquefied gas. However, here, this cargo tank 11 is a tank formed of a spherical low-temperature liquefied gas tank called a MOSS type tank, and a part of this cargo tank 11 protrudes above the upper deck 4 and moves forward and backward. Three are arranged side by side in the direction.

The total installed volume of the ^three low-temperature liquefied gas tanks is 60,000 m ³ or more and 90,000 m ³ or less, but the tank volume per unit of the cargo tank 11 is 20,000 m ³ or more and 30,000 m. Try to be ³ or less. As a result, the number of cargo tanks 11 is three, and a high-efficiency liquefied gas transport ship can be obtained for medium-scale and short-distance transport of liquefied gas while maintaining high transport efficiency. Accordingly, it becomes possible to efficiently carry out a small amount of unloading at a consumption area during medium-scale transportation, and efficiency in medium-scale transportation can be achieved.

  Moreover, since the MOSS type low-temperature liquefied gas tank that does not generate sloshing and can be transported in a semi-mounted state is adopted for the cargo tank 11, the sloshing problem due to the liquefied gas liquid can be solved, and the membrane tank of the prior art This liquefied gas transport ship can be operated in a semi-loading tank, which was not possible due to sloshing, and small quantities can be unloaded at multiple ports.

  Further, the cargo tank 11 has a heat insulation structure for LNG. In other words, by having a thermal insulation structure for LNG that can cope with minus 162 ° C. during transportation, the thermal insulation structure is effective even for ethylene with minus 104 ° C. during transportation.

  At the same time, especially when mixed loading is possible, the structural strength of the cargo tank 11 is set to a structural strength that allows the mounting of ethylene. In other words, the structural strength of the cargo tank 11 is a large factor due to the liquid specific gravity during transportation. Therefore, the liquid specific gravity of ethylene, which is the larger of the liquid specific gravity during transportation of LNG and ethylene, is 0.57 (note that In the case of ethane, it is structured to have structural strength with respect to 0.55). Moreover, it is comprised so that it may be the intensity | strength which can respond also to each full load state and a half mounted state with respect to both LNG and ethylene from which specific gravity differs. As a result, both LNG and ethylene can be mounted on the cargo tank 11.

  In addition, the structure strength of the cargo hold 10 on which the cargo tank 11 is mounted is set to a structure strength that allows the mounting of ethylene. Thereby, it is comprised so that the structure intensity | strength of the cargo hold 10 can also respond | correspond to the full load state of ethylene.

  As for the hull structure, the strength of the hull that supports the cargo tank 11 and sails is sufficiently strong to cope with LNG in terms of temperature, and is sufficient to cope with ethylene in terms of load. It has a good overall strength.

  At the same time, regarding the hull, when LNG having a relatively low specific gravity is mounted on the entire cargo tank 11, ethylene having a relatively high specific gravity is mounted on the entire cargo tank 11, or LNG and ethylene are loaded on the cargo tank 11. When operating in the three cases of mixed loading, it is configured to have sufficient restoration performance against drought and lateral inclination for navigation.

  As a result, even when LNG with a relatively low specific gravity is installed, drafts necessary for navigation can be secured, and even when ethylene with a relatively heavy specific gravity is installed, the drought and stability performance (stability required for navigation) can be secured. ), And even when LNG and ethylene having different specific gravities are mixedly loaded, the trim (vertical inclination) of the hull can be made a trim suitable for navigation. In other words, even when only LNG with a relatively low specific gravity is installed, when only ethylene with a relatively high specific gravity is installed, or when LNG and ethylene are installed together, sufficient stability can be ensured and safe navigation is possible. Configure to be in a state. These configurations can be sufficiently configured by a well-known conventional technique by securing the capacity of the ballast water tank and setting the arrangement and hull shape of the ballast water tank.

According to the liquefied gas transport ship 1A having the above configuration, the MOSS type cargo tank 11, the LNG heat insulation structure in the cargo tank 11, the structural strength of the ethylene cargo tank 11, the structural strength of the ethylene cargo hold 10, and the LNG The combination of hull structure, ballast water system, and hull shape that can accommodate both ethylene makes it a medium-sized liquefied gas transport ship with a total cargo tank capacity of 60,000 m ³ or more and 90,000 m ³ or less. Equipped with multi-gas for efficient delivery.

In other words, by the combination of transport scale, MOSS type cargo tank 11, structural strength of multi-gas compatible tank, cargo hold structural strength, hull structural strength, and ensuring draft, trim and stability during voyage, Engage in medium-scale liquefied gas transportation that transports liquefied gas of 60,000 m ³ or more and 90,000 m ³ or less, which can efficiently transport liquefied gas of medium scale and load and unload at multiple ports A liquefied gas transport ship can be provided.

  In other words, this liquefied gas transport ship 1A transports low-temperature liquefied gas such as LNG, ethane, ethylene, LPG, etc., and can be used as a dedicated ship for each liquefied gas, By adopting a configuration in which the gas processing apparatus is permanently installed or added as necessary, the configuration can be adapted for use as a multi-gas carrier in which the load can be changed according to the use of the liquefied gas.

  Further, by arranging the cargo equipment room 12 behind the cargo section R1, the passage 17 connecting the stern side cargo equipment room 12 and the engine room 5 with the navigation bridge 8a on the bow side is exposed. If it is placed above the upper deck 4 as a passage or closed passage, that is, the navigation bridge 8a on the bow (front) and the cargo equipment room 12 or engine room 5 on the stern side (艫) For example, it is possible to always go between the navigation bridge 8a and the cargo equipment room 12 in a state where they are connected by a traffic passage 17 which is an all-weather type sky walk constructed in a closed section. Here, although this passage 17 is arranged at the center of the hull and at the top of the cargo tank 11, this passage 17 is arranged on the side of the cargo tank 11 on the starboard or port side. It may be in a state.

  Furthermore, in the liquefied gas carrier 1A of the first embodiment, the residential area 8 is disposed in front of the cargo section R1, that is, in front of the cargo tank 11 in the front row. In this configuration, when the voyage bridge 8a is arranged on the residential area 8, the voyage bridge 8a is arranged in front of the cargo tank 11 at the foremost position. However, the forward view from the voyage bridge 8a is not obstructed and the forward visibility can be secured well, so that the maneuverability is improved. In particular, when the cargo tank 11 has a large structure protruding on the upper deck 4 like a spherical MOSS type tank, it is difficult to ensure visibility because of the tall large structure. The effect of adopting is increased. Further, when the dodger 8b is arranged on the navigation bridge 8a, it becomes easy to monitor the side of the hull such as entering and leaving the port.

  Further, from the viewpoint of the forward view, the height of the navigation bridge 8a can be lowered on the bow side compared to the case where the navigation bridge is arranged on the stern side, and the upper structure arranged on the stern side. Since there is no need to increase the height of the object, the height of the entire ship can be kept low. As a result, since the air draft is reduced, the range in which the liquefied gas carrier 1A can navigate is increased, and the versatility of the liquefied gas carrier 1A can be enhanced. For example, by lowering the air draft, it is possible to enter two or more important ports (for example, Montart Port in France, Everett Port in the United States, etc.).

  Further, the cargo equipment room 12 is located behind the cargo compartment R1, that is, behind the rearmost cargo tank 11 and partly or entirely above the engine room 5 (a part in FIGS. 1 and 2). That is, the cargo equipment room 12 is disposed immediately above the engine room 5. In other words, the engine room 5 is configured as a whole directly below the cargo equipment room 12. The cargo equipment room 12 is disposed in front of the chimney 9.

  As a result, the cargo equipment room 12 in which the facility for transferring the fuel gas is stored is placed between the cargo tanks 11 in the prior art, and in the present invention, the main machine and the power generation facility using the fuel gas are accommodated. Since the fuel gas pipes exiting from the cargo equipment room 12 are once taken out of the cargo equipment room and led to the engine room directly below, the engine room 5 is disposed directly above the engine room 5. It is also possible to adopt a configuration that immediately leads to a certain engine room 5.

  Further, the laying length of the high-pressure fuel gas pipe from the cargo equipment room 12 for using the liquefied gas as fuel to the main engine of the engine room 5 can be made short. By shortening the length of the fuel gas pipe, the possibility of leakage of the high-pressure gas is reduced correspondingly, and the risk of leakage of the high-pressure gas can be reduced. In addition, the range of anticorrosion measures is reduced, and the installation of electric wires such as power supply wires is facilitated.

  In addition, since the high-pressure fuel gas piping does not pass beside the residential area 8, even in the event of a gas leak, dangerous fuel gas can enter the residential area 8 or the high-pressure fuel gas can be directly boarded The possibility of injuring personnel can be significantly reduced.

  At the same time, it is no longer necessary to secure a space for placing the cargo equipment room 12 between the cargo tanks 11, so that it is possible to place other equipment between the cargo tanks 11. It will be possible to secure a place to install additional cargo handling equipment, additional superstructures and additional large fittings.

  Thereby, the place which can install equipments, such as the manifold 13 for cargo handling, and a ladder, spreads between the cargo tanks 11. That is, the cargo handling manifold 13 can be arranged not only at one location on both sides but also at two or more locations and at any location up to all locations between the cargo tanks 11.

  Since the cargo equipment room 12 is disposed in the narrow space between the cargo tanks 11 in the prior art, the first floor portion of the cargo equipment room 12 has to be a three-story structure with a front and rear passage space. Resolving the problem that the wind pressure resistance of the equipment room 12 increases and the height of the center of gravity increases, the cargo equipment room 12 is secured from the first floor to the left and right by using the full width of the upper deck 4 The installation height can be suppressed by using a two-story structure, which makes it possible to reduce wind pressure resistance and lower the center of gravity.

  Further, since the height of the cargo equipment room 12 provided on the engine room 5 on the stern side can be reduced, a steel material for the anti-vibration measures of the cargo equipment room 12 is not required, and the amount of the loaded load can be increased. Furthermore, since the height of the stern superstructure is low, the influence of wind pressure during mooring is reduced, so that the mooring equipment can be made smaller, and the amount of the loaded load can be increased accordingly. Moreover, since the height of the chimney is also low, the material used for the chimney 9 can be reduced, and the amount of loaded load can be increased accordingly.

  Further, when the deck tank (not shown) or the liquefied gas fuel tank 11a is arranged above the cargo equipment room 12, the upper side of the cargo equipment room 12 can be used effectively, and the liquefied gas fuel tank 11a and the cargo The fuel gas piping between the devices in the device chamber 12 can be shortened.

  In addition, if the cargo equipment chamber 12 is configured such that a flange or valve of the fuel gas pipe led to the main engine is arranged inside the cargo equipment room 12, the high-pressure fuel gas pipe is exposed to the outside so that the crew can pass therethrough. The risk of injury due to gas leakage from the fuel gas piping can be reduced, and safety can be increased.

  Next, with reference to FIG.3 and FIG.4, the liquefied gas carrier ship 1B of the 2nd Embodiment which concerns on this invention is demonstrated. The liquefied gas carrier 1B is the first embodiment in that the living quarter 8 is arranged behind the cargo equipment room 12 while the bow tower including the navigation bridge 8a is arranged in front of the cargo compartment R1. Different from the liquefied gas carrier 1A. According to the configuration of the liquefied gas carrier 1 </ b> B, a relatively simple layout change is required in which the residential area 8 is moved rearward from the cargo equipment room 12 and installed with the movement of the cargo equipment room 12. In particular, when there is no place to provide a residential area at the bow, it is possible to arrange the residential area without increasing the length of the ship. This arrangement is effective when it is not possible to secure the installation location of the cargo equipment room on the upper deck 4 of the cargo compartment and to secure the installation location of the residential district at the bow.

  Further, since the height of the residential area 8 provided on the engine room 5 on the stern side can be reduced, the vibration of the residential area 8 is reduced, thereby eliminating the need for steel materials for anti-vibration measures. The load can be increased. Furthermore, since the influence of the wind pressure during mooring is reduced because the height of the residential area 8 is reduced, the mooring equipment can be made smaller, and the amount of loaded load can be increased accordingly. In addition, since the height of the chimney is also reduced, the material used for the chimney can be reduced, and the amount of loaded load can be increased accordingly.

  Therefore, the height of the residential area 8 can be suppressed, the effect of improving the general versatility of the ship by suppressing the air draft, the weight of reinforcement for moisturizing measures, and the weight of fitting equipment for mooring can be suppressed. It is possible to obtain the effect of increasing the size and the effect of preventing the false image reflection of the radar.

  Next, a liquefied gas carrier 1C according to a third embodiment of the present invention will be described with reference to FIGS. The liquefied gas carrier 1C is different from the liquefied gas carrier 1B according to the second embodiment in that a section 14 is disposed between the residential area 8 including the cargo equipment room 12 and the navigation bridge 8a.

  This section 14 is in a state in which any one or more of a cofferdam, a void, a fuel oil tank, and a water tank are disposed, or a part of the engine room 5 is formed from the upper deck 4 The engine room protrudes above and is in a state where it is provided as a projecting part, or a state in which either one or both of a machine room and a warehouse that are separate from the engine room 5 are arranged is provided. It is configured as follows. In this machine room, an air conditioner (air conditioner), hydraulic equipment, and the like are arranged.

  As a result, the compartment 14 does not require the cargo equipment room 12 and the residential area 8 to be adjacent to each other. Therefore, even if a gas leak occurs in the cargo equipment room 12, the leaked gas in the residential area 8 Can reduce the risk of intrusion.

  Next, a liquefied gas carrier 1D according to a fourth embodiment of the present invention will be described with reference to FIGS. The liquefied gas carrier 1D has a cofer dam, a void, a fuel oil tank, a water tank, a fuel oil transfer pump, a ballast pump, and a ballast water treatment device at the front of the engine room 5 below the cargo equipment room 12. The point provided with the division 15 ahead of the engine room 5 provided with any one or more differs from the liquefied gas carrier ship 1B of 2nd Embodiment.

  With this configuration, a space can be provided between the engine room 5 and the cargo compartment R 1, and the fuel gas pipe from the cargo equipment room 12 is disposed in the compartment 15 in front of the engine room 5. As a result, even when a gas leak occurs in the cargo equipment room 12, the risk of the leaked gas entering the engine room 5 can be reduced.

  Next, with reference to FIG.9 and FIG.10, the liquefied gas carrier ship 1E of the 5th Embodiment which concerns on this invention is demonstrated. This liquefied gas carrier 1E is located above the engine room 5 having any one or more of a cofferdam, a void, a fuel oil tank, and a water tank above the engine room 5 below the cargo equipment room 12. This section is different from the liquefied gas carrier ship 1B of the second embodiment.

  With this configuration, since a gap can be arranged between the cargo equipment room 12 and the engine room 5, even when a gas leak occurs in the cargo equipment room 12, the leakage is caused in the engine room 5. The risk of the invading gas can be reduced.

  According to the liquefied gas carriers 1 </ b> A to 1 </ b> E having the above-described configuration, the cargo equipment room 12 is disposed above the engine room 5, so that the cargo equipment room 12 is located between the cargo tanks 11 and the last cargo tank 11. In the high-pressure fuel gas piping from the cargo equipment room 12 to the main engine of the engine room 5 that is used for using liquefied gas such as natural gas as fuel Since the length can be reduced, the risk of leakage of high-pressure fuel gas can be reduced.

  At the same time, the movement of the cargo equipment room 12 eliminates the restriction that the cargo equipment room 12 can be accommodated in the space between the cargo tanks 11, and the cargo equipment room 12 can be made larger. The space where there was 12 can be made vacant, so that it is possible to secure a place to install additional cargo handling equipment such as an additional cargo handling manifold, additional superstructure for another use, and additional large equipment. It becomes like this.

  Next, a method for designing a floating structure provided with a liquefied gas storage facility according to an embodiment of the present invention will be described. This liquefied gas transport ship design method has a cargo compartment equipped with a cargo tank 11 formed of a MOSS type low-temperature liquefied gas tank, an engine room behind the cargo compartment, and a part of the residential district 8. Or it is the design method of the floating body structure provided with the liquefied gas storage equipment provided all on the upper deck 4, Here, the liquefied gas transport ship 1 (1 is adopted as a generic name of 1A to 1E) is taken as an example. explain.

  As shown in FIG. 11, the steps of this design method, that is, the design step S1 of the liquefied gas transport ship 1, are the tank design step S10, the tank peripheral design step S20, the hull design step S30, and the room arrangement design step S40. It is comprised.

In this tank design process S10, the total loading volume of the cargo tank 11 is set to 60,000 m ³ or more and 90,000 m ³ or less. At the same time, especially when mixed loading is possible, the structural strength of the cargo tank 11 and the structural strength of the cargo hold 10 on which the cargo tank 11 is mounted are designed to be structural strength against ethylene. Further, in the tank design step S10, the heat-proof specification of the cargo tank 11 is designed as the heat-proof specification for the cargo having the lowest transport temperature among the cargo to be loaded.

  In other words, the cargo tank 11 is designed to be able to cope with heat shrinkage and high load so as to satisfy the handling of LNG at a very low temperature and satisfy the handling of the high specific gravity of ethylene. This liquefied gas transport ship 1 transports liquefied gases such as LNG, LPG, ethane, ethylene, etc., and can be used as a dedicated ship for each liquefied gas, and if necessary, a liquefier, By additionally providing a gas processing device, the structure can be adapted for use as a multi-gas carrier that can change the load according to the type of liquefied gas.

The tank design step S10 includes a tank volume determination step S11 in which the number of cargo tanks 11 is set to three and the tank volume per unit is set to 20,000 m ³ or more and 30,000 m ³ or less. It is preferable that the number of cargo tanks 11 is three, thereby maintaining high transportation efficiency and efficiently carrying out a small amount of unloading at a consumption area for medium-scale transportation. A liquefied gas transport ship 1 can be designed.

  In the tank peripheral design step S20, a cargo handling manifold 13 is connected to one, some or all of the cargo tanks 11 (all between each in FIG. 1) on the land or offshore cargo handling equipment side piping. Is designed to be placed.

  Thereby, the liquefied gas transport ship 1 provided with the manifold 13 for cargo handling which increased the consistency with the cargo handling equipment side on land or the ocean can be designed efficiently. In addition, you may comprise this tank periphery design process S20 so that it may be included in the tank design process S10 or the hull design process S30.

  In the hull design step S30, the hull structure is the same as that when the LNG is mounted on the entire cargo tank 11, when ethylene is mounted on the entire cargo tank 11, or when LNG and ethylene are mixedly loaded on the cargo tank 11. It is designed to operate in each case.

Further, in this hull design step S30, for example, re-use by removing the cargo tank 11 of the existing LNG carrier, such as having to 4 to the cargo tank 11 of 125,000M ³ or more 135,000M ³ below MOSS type 5 group It is preferable that the hull structure is configured to include an existing tank utilization process S31 that is designed in accordance with the cargo tank 11 of an existing LNG ship on the assumption that the hull is mounted. Thereby, it becomes unnecessary to design the MOSS type cargo tank 11 again, and the liquefied gas transport ship 1 can be designed efficiently.

  In the room arrangement design step S40, the cargo equipment room 12 is arranged behind the cargo compartment R1 and partly or entirely above the engine room 5. Note that the cargo equipment room 12 is disposed on a part or all of the upper side of the engine room 5 when the part of the ceiling of the engine room 5 becomes the floor of the cargo equipment room 12 and when the whole of the ceiling of the engine room 5 is covered. The case where it becomes the floor of the cargo equipment room 12 is shown. Thereby, when there are three cargo tanks 11, the cargo equipment room 12 is arranged on the upper side of the engine room 5, so that there are two places for placing the cargo handling manifold 13 on both sides. The degree of freedom of the arrangement location of the manifold 13 occurs.

According to the floating structure 1 having the above-structured liquefied gas storage facility and its design method, the cargo equipment room 12 is located between the cargo tanks 11 by arranging the cargo equipment room 12 above the engine room 5. will be moved to the rear of the cargo tank 11 of the rearmost end from the liquefied gas such as natural gas is used for use as a fuel, high-pressure fuel gas pipe leading to the main engine of the engine room 5 from the cargo equipment room 12 Since the laying length can be shortened, the risk of leakage of high-pressure gas can be reduced.

  At the same time, by moving the cargo equipment room 12 from the arrangement of the cargo equipment room 12 between the conventional cargo tanks 11 to the rear of the cargo compartment R1, the space between the cargo tanks 11 is obtained in the configuration of the present invention. The restriction of accommodating the cargo equipment room 12 can be eliminated, the cargo equipment room 12 can be enlarged, and the space for the cargo equipment room 12 between the cargo tanks 11 is vacant. It will be possible to secure a place to install additional cargo handling equipment, additional superstructure, and additional large fittings.

  In addition to LNG, liquefied gas storage facilities that can efficiently transport liquefied gas, such as ethane or ethylene, by LNG or short-distance transportation, and can be loaded and unloaded at multiple ports. It is possible to provide a floating structure provided with.

  According to the floating structure having the liquefied gas storage facility of the present invention and the design method thereof, the high-pressure fuel gas pipe used for using the liquefied gas as a fuel from the cargo equipment room to the main engine of the engine room is used. Since the laying length can be shortened, the risk of leakage of high-pressure gas can be reduced, and at the same time, the cargo equipment room is freed from the restriction of being placed in the space between cargo tanks. The room can be enlarged, and the space for the cargo equipment room between the cargo tanks is vacant, and it is possible to secure a place to install additional cargo handling equipment, additional superstructure, and additional large equipment. Therefore, a liquefied gas carrier ship equipped with a liquefied gas storage facility, a ship equipped with a liquefied gas fuel tank, a floating structure equipped with a liquefied gas fuel tank, or a floating body having a liquefied gas storage facility It can be used for floating construction and the design method thereof comprising a liquefied gas storage facility, such as a creation.

1A-1E, 1X Liquefied gas carrier (floating structure with liquefied gas storage facility)
2 Ship bottom 2a Cargo hold bottom plate 3 Ship side 4 Upper deck 5 Engine room 6 Propeller 7 Rudder 8 Residential area 8a Navigational bridge 9 Chimney 10 Cargo hold 11 Cargo tank 11a Liquefied gas fuel tank 12 Cargo equipment room 13 Cargo manifold 14 Compartment 15 Engine room Section 16 ahead of Section 17 above engine room 17 Road R1 Cargo section

Claims (16)

A cargo compartment equipped with a cargo tank formed of a MOSS-type cryogenic liquefied gas tank, an engine room behind the cargo compartment, and a part or all of the residential district is provided on the upper deck A floating structure with a liquefied gas storage facility,
In a state where a cargo equipment room is arranged at the rear of the cargo compartment and partly or entirely above the engine room,
The total loading volume of the cargo tank is 60,000 m ³ or more and 90,000 m ³ or less,
And the structural strength of the cargo tank and the structural strength of the cargo hold on which the cargo tank is mounted are structural strengths that allow mounting of LNG, ethane, ethylene, or LPG,
In addition, the hull structure has a structure in which LNG is mounted on all the cargo tanks, ethane, ethylene, or LPG is mounted on all of the cargo tanks, or a plurality of LNG, ethane, ethylene, and LPG are installed on the cargo tank. A floating structure equipped with a liquefied gas storage facility, characterized in that, in three cases of mixed loading, the ship is provided with sufficient recovery performance against drought and lateral inclination during navigation.   The floating structure provided with the liquefied gas storage facility according to claim 1, wherein the cargo tank has a thermal insulation structure for cargo. The liquefied gas storage facility according to claim 1 or 2, wherein the number of cargo tanks mounted is three and the tank volume per unit is 20,000 m ³ or more and 30,000 m ³ or less. Floating structure.   The cargo handling manifold capable of connecting piping on the side of the cargo handling equipment on land or offshore is arranged at one, some or all between each of the cargo tanks. A floating structure provided with the liquefied gas storage facility according to any one of the above.   The liquefied gas storage facility according to any one of claims 1 to 4, further comprising a bow tower including a voyage bridge disposed in front of the cargo section or the residential area. Floating structure.   A bow tower including a voyage bridge disposed in front of the cargo section, and a residential area disposed behind the cargo equipment room without the voyage bridge. Item 5. A floating structure including the liquefied gas storage facility according to any one of Items 1 to 4. Is a compartment in which any one or more of a cofferdam, an empty space, a fuel oil tank, and a water tank are disposed behind the cargo equipment room, and the residential area is disposed behind the compartment? ,
Alternatively, an engine room projecting portion is provided behind the cargo equipment room, with a part of the engine room projecting above the upper deck, and the residential area is located behind the engine room projecting portion. Or
Alternatively, a compartment in which either one or both of a machine room and a warehouse, which is a compartment different from the engine room, is disposed behind the cargo equipment room, and the residential area is disposed behind the compartment. The floating structure provided with the liquefied gas storage facility according to any one of claims 1 to 6, wherein   One or more of a cofer dam, an empty space, a fuel oil tank, a water tank, a fuel oil transfer pump, a ballast pump, and a ballast water treatment device are provided at the front of the engine room below the cargo equipment room. The floating structure provided with the liquefied gas storage facility according to any one of claims 1 to 7, wherein the compartment is arranged.   A section in which any one or more of a cofferdam, an empty space, a fuel oil tank, and a water tank are disposed below the cargo equipment room and above the engine room is characterized in that A floating structure provided with the liquefied gas storage facility according to any one of claims 1 to 7.   The floating body provided with the liquefied gas storage facility according to any one of claims 1 to 9, wherein a flange or a valve of a fuel gas pipe led to the main engine is arranged inside the cargo equipment room. Structure.   The floating structure equipped with the liquefied gas storage facility is either a liquefied gas carrier ship, a ship using liquefied gas as a fuel, a liquefied gas carrier ship having a regasification device, a floating gas liquefaction facility, or a floating body regasification facility. It is one, The floating body structure provided with the liquefied gas storage facility of any one of Claims 1-10 characterized by the above-mentioned. A liquefied gas having a cargo compartment equipped with a cargo tank formed of a MOSS type low-temperature liquefied gas tank, an engine room behind the cargo compartment, and a part or all of the residential district provided on the upper deck A method for designing a floating structure with a storage facility,
The total loading volume of the cargo tank is set to 60,000 m ³ or more and 90,000 m ³ or less, and the structural strength of the cargo tank and the structural strength of the cargo hold on which the cargo tank is mounted are structures for LNG, ethane, ethylene, or LPG. Tank design process to design with strength,
When the LNG is mounted on all of the cargo tanks, ethane, ethylene, or LPG is mounted on all of the cargo tanks, or a plurality of LNG, ethane, ethylene, and LPG are mixedly mounted on the cargo tank. A hull design process designed to enable navigation in each of the three cases,
A design of a floating structure with a liquefied gas storage facility, comprising a room arrangement design step of arranging a cargo equipment room at a part or all of the rear of the cargo compartment and above the engine room Method.   13. The floating body with a liquefied gas storage facility according to claim 12, wherein, in the tank design step, the heat-proof specification of the cargo tank is designed as a heat-proof specification for cargo having the lowest transport temperature among cargo to be loaded. How to design a structure. The tank design step includes a tank volume determination step of designing the cargo tank so that the number of cargo tanks mounted is three and the tank volume per unit is 20,000 m ³ or more and 30,000 m ³ or less. The design method of the floating structure provided with the liquefied gas storage facility of Claim 12 or 13. The hull design step, 125,000m ³ or more 135,000M ³ following the said cargo hull structure on the assumption that mounting remove the cargo tank of an existing LNG carrier the existing LNG carrier having a cargo tank The design method of the floating structure provided with the liquefied gas storage facility according to any one of claims 12 to 14, further comprising an existing tank utilization process designed in accordance with the tank.   16. A tank peripheral design step of arranging a cargo handling manifold for connecting piping on the side of the cargo handling equipment on land or offshore to one, some or all of the cargo tanks. The design method of the floating body structure provided with the liquefied gas storage facility of any one of Claims.

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