JP7446928B2 - liquefied gas carrier - Google Patents

liquefied gas carrier Download PDF

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Publication number
JP7446928B2
JP7446928B2 JP2020102145A JP2020102145A JP7446928B2 JP 7446928 B2 JP7446928 B2 JP 7446928B2 JP 2020102145 A JP2020102145 A JP 2020102145A JP 2020102145 A JP2020102145 A JP 2020102145A JP 7446928 B2 JP7446928 B2 JP 7446928B2
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liquefied gas
tank
cargo
compartment
ship
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JP2021194986A (en
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崇 中田
俊太郎 江川
拓久 松本
達弥 木下
廉彦 佐藤
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Mitsui E&S Shipbuilding Co Ltd
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Mitsui E&S Shipbuilding Co Ltd
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Priority to JP2020102145A priority Critical patent/JP7446928B2/en
Priority to CN202021560786.XU priority patent/CN213735442U/en
Priority to KR2020210001786U priority patent/KR20210002850U/en
Publication of JP2021194986A publication Critical patent/JP2021194986A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B11/00—Interior subdivision of hulls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B15/00—Superstructures, deckhouses, wheelhouses or the like; Arrangements or adaptations of masts or spars, e.g. bowsprits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/24—Arrangement of ship-based loading or unloading equipment for cargo or passengers of pipe-lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/16—Shells
    • B63B3/20—Shells of double type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/08—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B2025/087—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid comprising self-contained tanks installed in the ship structure as separate units

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Description

本発明は液化ガス運搬船に関する。 The present invention relates to a liquefied gas carrier.

ＬＮＧ（液化天然ガス）やＬＰＧ（液化石油ガス）のような液化ガスを貨物として運搬する液化ガス運搬船は、液化ガスを貯蔵する液化ガスタンクを貨物区画に備える。
小型船用の液化ガスタンクは円筒状タンク（シリンダータンク）が一般的である（特許文献１）。一方で円筒状タンクは長手方向を船長方向に向けて配置するとタンクの上下端と船側との間に隙間が生じるため、容積効率を向上させ難い。そのため、一定以上の貨物容積で、船長、型幅、吃水に制約がない場合は、容積効率を向上させるために、円筒を並列に結合したバイローブタンク又はマルチローブタンクが用いられる（特許文献２）。バイローブタンクは円筒状タンクよりも小さい直径で同じ容積にできるため容積効率に優れ、タンク長さに対して幅広のタンクにできる。 Liquefied gas carriers that transport liquefied gas such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas) as cargo are equipped with liquefied gas tanks in their cargo compartments to store the liquefied gas.
A liquefied gas tank for a small boat is generally a cylindrical tank (cylinder tank) (Patent Document 1). On the other hand, if a cylindrical tank is arranged with its longitudinal direction facing the ship's vessel length, gaps will be created between the upper and lower ends of the tank and the ship's side, making it difficult to improve the volumetric efficiency. Therefore, if the cargo volume is above a certain level and there are no restrictions on ship length, mold width, or stuttering, bilobed tanks or multilobe tanks in which cylinders are connected in parallel are used to improve volumetric efficiency (Patent Document 2). ). Bilobed tanks have a smaller diameter than cylindrical tanks and can have the same volume, so they have excellent volumetric efficiency and can be made wider than the tank length.

特開平８－２４７８号公報Japanese Patent Application Publication No. 8-2478 特表２０１９－５１５２０９号公報Special table 2019-515209 publication

しかしながらバイローブタンクは円筒を並列に接合した構造であるため、円筒状タンクより構造が複雑で重くなる。またバイローブタンクの容積効率を向上させるために幅を広くすると船側とタンクの距離が近くなり、船側が損傷して貨物区画に浸水した際にタンクが損傷し易くなる。そのため復原性を維持するため貨物区画を複数の水密区画に分割して、区画ごとにタンクを設置する必要があり、タンク数が増えて重くなる。よって、河川用船舶のような浅吃水船は、タンク重量を支える排水量を確保するために、船幅をタンクの寸法に対して外航船以上に大きくする必要があり、バイローブタンクを用いても容積効率が向上し難い問題があった。船幅を大きくすると推進抵抗が悪化する問題や、狭水路で他船との衝突を回避し難くなる問題もあった。
本発明は上記課題に鑑みてなされたもので、貨物容積を小さくせずにタンク重量を軽くでき、船幅が広くなるのも抑制できる液化ガス運搬船の提供を目的とする。 However, since a bilobed tank has a structure in which cylinders are joined in parallel, the structure is more complicated and heavier than a cylindrical tank. Furthermore, increasing the width of bilobed tanks to improve their volumetric efficiency brings the tank closer to the ship's side, making the tank more susceptible to damage if the ship's side is damaged and water floods into the cargo compartment. Therefore, in order to maintain stability, it is necessary to divide the cargo compartment into multiple watertight compartments and install a tank in each compartment, which increases the number of tanks and increases the weight. Therefore, in order to ensure the displacement of a shallow water vessel such as a river vessel to support the weight of the tank, the width of the vessel must be larger than that of an ocean-going vessel in relation to the tank dimensions, and even if bilobed tanks are used, There was a problem that it was difficult to improve volumetric efficiency. Increasing the width of the ship worsened the propulsion resistance and made it difficult to avoid collisions with other ships in narrow channels.
The present invention has been made in view of the above-mentioned problems, and aims to provide a liquefied gas carrier ship that can reduce the weight of the tank without reducing the cargo volume, and can also prevent the ship from becoming wider.

本発明の貨物船は、貨物である液化ガスの積載可能容積が５００００ｍ３以下の液化ガス運搬船であって、前記液化ガスが積載される区画である貨物区画を備える船体と、円筒状の独立タンクで長手方向が船長方向を向くように前記貨物区画に１つ配置されるか、又は複数が直列配置されて前記液化ガスを貯蔵する液化ガスタンクと、を備え、型幅をＢ、前記液化ガスタンクの円筒の直径をＤとした場合に、以下の式（２）で示す関係を満たすことを特徴とする。
（５／３）＜（Ｂ／Ｄ）＜（１７／１０） …式（２） The cargo ship of the present invention is a liquefied gas carrier having a capacity for loading liquefied gas as cargo of 50,000 m3 or less, and includes a hull having a cargo compartment in which the liquefied gas is loaded, and a cylindrical independent tank. a liquefied gas tank that stores the liquefied gas, one or a plurality of which are arranged in series in the cargo compartment so that the longitudinal direction faces the ship's ship direction; It is characterized by satisfying the relationship expressed by the following equation (2) , where the diameter of the cylinder is D.
(5/3)<(B/D)<(17/10)...Formula (2)

この構成では、バイローブタンクより軽い円筒状タンクを直列配置して船側とタンクの距離を長くして浸水時のタンク損傷を抑制することで貨物区画の横隔壁数を減らす。横隔壁数が減ると貨物区画内の水密区画が船長方向に長くなるため、タンク長を長くすることで容積を減らさずにタンク数を減らし、タンク重量を抑制する。
そのため、貨物容積を小さくせずにタンク重量を軽くでき、船幅が広くなるのも抑制できる。 In this configuration, cylindrical tanks, which are lighter than bilobed tanks, are arranged in series to increase the distance between the tanks and the ship's side, thereby reducing the number of transverse bulkheads in the cargo compartment by reducing tank damage in the event of flooding. If the number of transverse bulkheads is reduced, the watertight section within the cargo compartment becomes longer in the longitudinal direction, so by increasing the tank length, the number of tanks can be reduced without reducing the volume, and the tank weight can be suppressed.
Therefore, the weight of the tank can be reduced without reducing the cargo volume, and the width of the ship can be prevented from increasing.

本発明によれば、貨物容積を小さくせずにタンク重量を軽くでき、船幅が広くなるのも抑制できる液化ガス運搬船を提供できる。 According to the present invention, it is possible to provide a liquefied gas carrier ship that can reduce the weight of the tank without reducing the cargo volume and can also prevent the ship from becoming wider.

本実施形態に係る液化ガス運搬船の概要を示す側面図である。It is a side view showing an outline of a liquefied gas carrier concerning this embodiment. 図１の正面図である2 is a front view of FIG. 1. 図１の平面図である。FIG. 2 is a plan view of FIG. 1; 図１の貨物区画上方の暴露甲板、上部構造物、貨物機器室及びマニフォールドの記載を省略した平面図である。FIG. 2 is a plan view with illustrations of the exposed deck, superstructure, cargo equipment room, and manifold above the cargo compartment in FIG. 1 omitted. 図１の変形例であって、液化ガスタンクを３つ直列配置した液化ガス運搬船を示す。This is a modification of FIG. 1, and shows a liquefied gas carrier in which three liquefied gas tanks are arranged in series. 図１の変形例であって、貨物機器室を機関区画の上方に設けた液化ガス運搬船を示す。2 shows a modification of FIG. 1, in which a liquefied gas carrier is provided with a cargo equipment room above the engine compartment.

以下、図１～図６を参照して本実施形態に係る液化ガス運搬船１の構成を説明する。
図１及び図２に示すように液化ガス運搬船１は、船体３、貨物区画７、液化ガスタンク１７、及び貨物機器室３３を備える。 The configuration of the liquefied gas carrier 1 according to this embodiment will be described below with reference to FIGS. 1 to 6.
As shown in FIGS. 1 and 2, the liquefied gas carrier 1 includes a hull 3, a cargo compartment 7, a liquefied gas tank 17, and a cargo equipment room 33.

船体３は液化ガス運搬船１の船殻となる構造体であり、船底７１、船側７３、及び暴露甲板６１で船内を囲むように構成される。具体的な船型や船殻構造、あるいは水密隔壁の配置等は液化ガス運搬船１の用途に応じて適宜設計される。 The hull 3 is a structure serving as the hull of the liquefied gas carrier 1, and is configured to surround the inside of the ship with a bottom 71, a ship side 73, and an exposed deck 61. The specific hull shape, hull structure, arrangement of watertight bulkheads, etc. are designed as appropriate depending on the use of the liquefied gas carrier 1.

液化ガス運搬船１は貨物である液化ガスの積載可能容積が５００００ｍ3以下である。積載可能容積が５００００ｍ3超の液化ガス運搬船１は、積載可能容積に余裕があるため、本実施形態の液化ガス運搬船１でなくても貨物容積を小さくせずに船幅が広くなるのも抑制できるためである。
液化ガスの積載可能容積の下限は液化ガス運搬船１に求められる輸送能力と輸送コストの兼ね合いで設定するが、例えば１００００ｍ3以上である。液化ガスの積載可能容積が１００００ｍ3未満の小型船は元々タンクが小さくタンク重量が軽いため、積載可能容積が１００００ｍ3以上の船舶と比べてタンク重量を軽くする必要性が低いためである。 The liquefied gas carrier 1 has a capacity for loading liquefied gas as cargo of 50,000 m 3 or less. Since the liquefied gas carrier 1 with a loadable capacity of more than 50,000 m 3 has ample capacity, even if it is not the liquefied gas carrier 1 of this embodiment, the width of the ship can be prevented from increasing without reducing the cargo volume. This is because it is possible.
The lower limit of the capacity of the liquefied gas that can be loaded is set based on the balance between the transportation capacity required of the liquefied gas carrier 1 and the transportation cost, and is, for example, 10,000 m 3 or more. This is because small ships with a capacity for carrying liquefied gas of less than 10,000 m 3 have small tanks and light weight, so there is less need to reduce the weight of the tanks compared to ships with a capacity of 10,000 m 3 or more.

液化ガス運搬船１の吃水は航行する水路の水深によるが、液化ガス運搬船１が河川用船舶である場合、図２に示す計画吃水ＦＤが６ｍ未満であるのが好ましい。
計画吃水ＦＤが６ｍ未満であれば、液化ガス運搬船１が長江のような大陸の河川を少なくとも中流域まで航行できる。 The swamp of the liquefied gas carrier 1 depends on the water depth of the waterway in which it navigates, but if the liquefied gas carrier 1 is a river vessel, it is preferable that the planned swamp FD shown in FIG. 2 is less than 6 m.
If the planned drainage FD is less than 6 m, the liquefied gas carrier 1 can navigate continental rivers such as the Yangtze River up to at least the middle reaches.

図１に示すように船体３は液化ガスが積載される貨物区画７を備える。より具体的には、船体３は船内区画として船尾から船首に向けて順に設けられた機関区画５、貨物区画７、及び船首区画９を備える。 As shown in FIG. 1, the hull 3 includes a cargo compartment 7 in which liquefied gas is loaded. More specifically, the hull 3 includes an engine compartment 5, a cargo compartment 7, and a bow compartment 9, which are provided in order from the stern to the bow as internal compartments.

機関区画５は主機等の液化ガス運搬船１の推進機構の動力源が配置される区画であり、船長方向において船体３の最も船尾側の区画である。
機関区画５の船首方向最先端には水密構造の横隔壁である機関隔壁１５が設けられ、機関区画５と貨物区画７は機関隔壁１５で船長方向に分離される。
機関区画５の上方の暴露甲板６１上には主機の燃焼で生じた排ガスを排気する排気管が配置される化粧煙突１３や、排ガス処理設備等が収納されたエンジンケーシング１１が必要に応じて設けられる。 The engine compartment 5 is a compartment in which the power source of the propulsion mechanism of the liquefied gas carrier 1, such as the main engine, is arranged, and is the compartment closest to the stern of the hull 3 in the ship's ship direction.
An engine bulkhead 15, which is a horizontal bulkhead having a watertight structure, is provided at the foremost end of the engine compartment 5 in the bow direction, and the engine compartment 5 and the cargo compartment 7 are separated by the engine bulkhead 15 in the ship's length direction.
On the exposed deck 61 above the engine compartment 5, a decorative chimney 13 in which an exhaust pipe for discharging exhaust gas generated by combustion of the main engine is arranged, and an engine casing 11 in which exhaust gas treatment equipment, etc. are housed are provided as necessary. It will be done.

液化ガス運搬船１は、船体３を船長方向に推進するための推進機構を備える。図３では推進機構としてプロペラ６を例示している。
プロペラ６の数は１基でもよいが、液化ガス運搬船１が河川用船舶の場合、図３に示すように複数のプロペラ６を船幅方向に対して並列配置するのが好ましい。ここでいう並列配置とは船幅方向に複数のプロペラ６を配置することを意味する。図３では２基のプロペラ６を例示しているが、３基以上でもよい。
このように液化ガス運搬船１が複数のプロペラ６を並列配置した多軸船とすることで、河川のような水深が浅い水路での座礁を防ぐためにプロペラ６の直径を大きくできない浅吃水船でも、必要な推進力を一軸船よりも得やすい。 The liquefied gas carrier 1 includes a propulsion mechanism for propelling the hull 3 in the direction of the ship's length. In FIG. 3, a propeller 6 is illustrated as the propulsion mechanism.
Although the number of propellers 6 may be one, if the liquefied gas carrier 1 is a river vessel, it is preferable to arrange a plurality of propellers 6 in parallel in the width direction as shown in FIG. The parallel arrangement here means that a plurality of propellers 6 are arranged in the width direction of the ship. Although two propellers 6 are illustrated in FIG. 3, three or more propellers may be used.
In this way, by making the liquefied gas carrier 1 a multi-shaft ship with a plurality of propellers 6 arranged in parallel, even a shallow water ship in which the diameter of the propeller 6 cannot be increased to prevent grounding in a shallow waterway such as a river, can be used. It is easier to obtain the necessary propulsion force than a single-shaft ship.

貨物区画７は液化ガス運搬船１が輸送する貨物が配置される区画であり、図１に示すように船長方向において、機関区画５と船首区画９の間に設けられる。
機関区画５の船首方向最先端には水密構造の横隔壁である貨物隔壁２１が設けられ、船首区画９と貨物区画７は貨物隔壁２１で船長方向に分離される。 The cargo compartment 7 is a compartment in which cargo to be transported by the liquefied gas carrier 1 is arranged, and is provided between the engine compartment 5 and the bow compartment 9 in the ship's length direction, as shown in FIG.
A cargo bulkhead 21, which is a transverse bulkhead having a watertight structure, is provided at the foremost end of the engine compartment 5 in the bow direction, and the bow compartment 9 and the cargo compartment 7 are separated by the cargo bulkhead 21 in the ship's length direction.

貨物区画７には液化ガスタンク１７が積載される。
液化ガスタンク１７は液化ガスを貯蔵するタンクである。液化ガスとは、常温、常圧で気体のガスを冷却や圧縮で液体にしたものであり、ＬＮＧ、ＬＰＧ、エタン、エチレン、アンモニア、水素を例示できる。 A liquefied gas tank 17 is loaded in the cargo compartment 7.
The liquefied gas tank 17 is a tank that stores liquefied gas. Liquefied gas is a gas that is a gas at room temperature and pressure and is turned into a liquid by cooling or compression, and examples thereof include LNG, LPG, ethane, ethylene, ammonia, and hydrogen.

図１及び図２に示すように液化ガスタンク１７は円筒状の独立タンクである。
ここでいう「円筒状」とは、軸方向に直交する断面が円環で構成され、円環の中心が１つのみの筒を意味する。よってバイローブタンクのように断面が複数の円環で構成され、複数の円環に対応した複数の中心がある形状は「円筒状」に含まない。
独立タンクとは、液密とタンク内圧をタンク自体で保持でき、船体３から独立しているタンクを意味する。 As shown in FIGS. 1 and 2, the liquefied gas tank 17 is a cylindrical independent tank.
The term "cylindrical" used herein means a cylinder whose cross section perpendicular to the axial direction is a ring, and the ring has only one center. Therefore, a shape such as a bilobed tank whose cross section is composed of a plurality of rings and has a plurality of centers corresponding to the plurality of rings is not included in the term "cylindrical".
An independent tank means a tank that can maintain liquid tightness and tank internal pressure within itself and is independent from the hull 3.

ここでいう「円筒状」とは、断面の直径が異なる部分を有する構造を含む。
例えば図１で示す液化ガスタンク１７は長手方向の両端が先細りの半球状であり、端部の断面の直径が中心部の断面の直径よりも小さいカプセル形状であるが、この形状も円筒状に含む。
ただし、両端が半球状の場合、長手方向の長さが短すぎると液化ガスタンク１７の外形が球形タンクに近くなり、タンクを船体３に設置するための支持構造が複雑になる。そのため、ここでいう「円筒状」とは、図１に示すようにタンクの全長Ｌcが、直径が等しい円筒部分の直径Ｄの１．５倍以上大きいことが望ましい。 The term "cylindrical" here includes a structure having portions with different cross-sectional diameters.
For example, the liquefied gas tank 17 shown in FIG. 1 has a hemispherical shape with tapered ends in the longitudinal direction, and has a capsule shape in which the diameter of the cross section at the end is smaller than the diameter of the cross section at the center, but this shape is also included in the cylindrical shape. .
However, when both ends are hemispherical, if the length in the longitudinal direction is too short, the outer shape of the liquefied gas tank 17 will become close to a spherical tank, and the support structure for installing the tank on the hull 3 will become complicated. Therefore, as shown in FIG. 1, the term "cylindrical" here means that the total length L c of the tank is preferably at least 1.5 times larger than the diameter D of the cylindrical portion having the same diameter.

液化ガスタンク１７は長手方向が船長方向を向くように貨物区画７に１つ配置されるか、又は複数が直列配置されて液化ガスを貯蔵する。直列配置とは、船長方向に１列に配置することを意味する。これは船幅方向に２列以上に液化ガスタンク１７を配置する並列配置の場合は、バイローブタンクと同様の配置になり、バイローブタンクを用いる場合と差異がないためである。なお、長手方向とは円筒の軸方向を意味する。
図１では２つの液化ガスタンク１７が直列配置されている。２つの液化ガスタンク１７の間には水密隔壁である貨物倉横隔壁３１が配置されており、２つの液化ガスタンク１７の一方が配置された区画に浸水しても、他方が配置された区画への浸水は貨物倉横隔壁３１に阻止される。 One liquefied gas tank 17 is arranged in the cargo compartment 7 so that its longitudinal direction faces the ship's ship direction, or a plurality of liquefied gas tanks 17 are arranged in series to store liquefied gas. Serial arrangement means arrangement in one row in the longitudinal direction. This is because in the case of a parallel arrangement in which the liquefied gas tanks 17 are arranged in two or more rows in the ship width direction, the arrangement is similar to that of a bilobed tank, and there is no difference from the case where a bilobed tank is used. Note that the longitudinal direction means the axial direction of the cylinder.
In FIG. 1, two liquefied gas tanks 17 are arranged in series. A cargo hold transverse bulkhead 31, which is a watertight bulkhead, is arranged between the two liquefied gas tanks 17, so that even if one of the two liquefied gas tanks 17 is flooded, the other one will not be flooded. Water intrusion is blocked by the cargo hold transverse bulkhead 31.

液化ガス運搬船１は、型幅をＢ、液化ガスタンク１７の円筒の直径をＤとした場合に、以下の式（１）で示す関係を満たす。
（５／３）＜（Ｂ／Ｄ）＜２ …式（１）
なお、ここでいう直径Ｄとは直径が等しい円筒部分の外径である。
式（１）の右側の不等号は液化ガスタンク１７の円筒の直径Ｄが貨物区画７の船幅（型幅Ｂ）の半分より大きいことを意味する。式（１）の左側の不等号は、液化ガスタンク１７を貨物区画７の船側７３に近接させずに距離を離して設置することを意味する。一般に液化ガスタンク１７は容積効率を向上させた上で積載可能容積を維持するため、船幅方向の長さを貨物区画７の船幅（型幅Ｂ）に近づけるが、本実施形態では逆に、船幅方向の長さである直径Ｄを小さくして船側７３との距離を離す。また、一般に液化ガスタンク１７は容積効率を向上させた上で積載可能容積を維持するために、バイローブタンクのように円筒を並列配置したタンクを用いるが、本実施形態では逆に円筒状のタンクを直列配置する。理由は積載可能容積を維持しつつ重量を削減するためである。 The liquefied gas carrier 1 satisfies the relationship expressed by the following equation (1), where B is the mold width and D is the diameter of the cylinder of the liquefied gas tank 17.
(5/3)<(B/D)<2...Formula (1)
Note that the diameter D here is the outer diameter of a cylindrical portion having the same diameter.
The inequality sign on the right side of equation (1) means that the diameter D of the cylinder of the liquefied gas tank 17 is larger than half of the ship width (type width B) of the cargo compartment 7. The inequality sign on the left side of equation (1) means that the liquefied gas tank 17 is installed at a distance from the ship's side 73 of the cargo compartment 7 without being close to it. Generally, the length of the liquefied gas tank 17 in the ship width direction is made close to the ship width (type width B) of the cargo compartment 7 in order to improve the volumetric efficiency and maintain the loadable volume, but in this embodiment, on the contrary, The distance from the ship side 73 is increased by reducing the diameter D, which is the length in the width direction of the ship. Furthermore, in general, the liquefied gas tank 17 uses a tank in which cylinders are arranged in parallel, such as a bilobed tank, in order to improve the volumetric efficiency and maintain the loadable volume, but in this embodiment, on the contrary, a cylindrical tank is used. are arranged in series. The reason is to reduce weight while maintaining loadable volume.

具体的には、まず円筒状タンクはバイローブタンクよりも構造が単純であり、同じ容積ではバイローブタンクより軽量なので重量を削減できる。次に、円筒状タンクを直列配置して直径Ｄを小さくすると、型幅Ｂを広くせずに船側７３とタンクの船幅方向の距離を長くできる。そのため、船側７３に他船や洋上構造物が衝突してもタンクが損傷し難くなるので、バイローブタンクのように船側７３とタンクを近接配置する場合よりも貨物区画７内の水密区画の数を減らしても損傷時の復原性を維持できる。特に貨物倉横隔壁３１の数を減らせるので、貨物区画７内の区画を船長方向に長くできる。区画が船長方向に長くなると、タンク長を長くできるので、同じ貨物容積でもタンク数を減らせる。タンク数が減ると同じ容積でもタンクの外壁面積が小さくなり、タンク内の艤装の物量も減るので、さらに重量を削減できる。 Specifically, first, a cylindrical tank has a simpler structure than a bilobed tank, and it is lighter than a bilobed tank for the same volume, so weight can be reduced. Next, by arranging cylindrical tanks in series and reducing the diameter D, the distance between the ship side 73 and the tank in the ship width direction can be increased without increasing the mold width B. Therefore, the tank is less likely to be damaged even if another ship or offshore structure collides with the ship's side 73, so the number of watertight compartments in the cargo compartment 7 is greater than when the tank is placed close to the ship's side 73 like a bilobed tank. Stability in the event of damage can be maintained even if the In particular, since the number of cargo hold transverse bulkheads 31 can be reduced, the compartments within the cargo compartment 7 can be made longer in the longitudinal direction. If the compartment becomes longer in the direction of the ship's length, the length of the tank can be increased, so the number of tanks can be reduced for the same cargo volume. If the number of tanks is reduced, the outer wall area of the tank will be smaller even if the volume is the same, and the amount of equipment inside the tank will also be reduced, resulting in further weight reduction.

このように、バイローブタンクよりも容積効率の悪い円筒状タンクを敢えて直径を小さくして直列配置すると、タンク長を長くできバイローブタンクを用いた場合と比べて積載可能容積を維持しつつ重量を削減でき、船幅が広くなるのも抑制できる。 In this way, by intentionally reducing the diameter of cylindrical tanks, which have lower volumetric efficiency than bilobed tanks, and arranging them in series, the length of the tanks can be increased, and the weight can be reduced while maintaining the loadable volume compared to using bilobed tanks. It is also possible to reduce the width of the ship and prevent it from becoming wider.

Ｂ／Ｄは大きい方が船側７３と液化ガスタンク１７の距離が長くなり、船側７３が損傷した場合に液化ガスタンク１７が損傷し難くなる。さらに液化ガスタンク１７の半径が小さくなり船体３の重心が低くなるため、損傷時の復原性の点では有利である。ただしＢ／Ｄが２以上になると、液化ガスタンク１７の直径Ｄが小さくなりすぎ、液化ガス運搬船１に要求される液化ガスの積載可能容積を満たせない可能性があるため、Ｂ／Ｄは２未満である。 The larger B/D is, the longer the distance between the ship's side 73 and the liquefied gas tank 17 becomes, and the liquefied gas tank 17 becomes less likely to be damaged when the ship's side 73 is damaged. Furthermore, since the radius of the liquefied gas tank 17 becomes smaller and the center of gravity of the hull 3 becomes lower, this is advantageous in terms of stability in the event of damage. However, if B/D becomes 2 or more, the diameter D of the liquefied gas tank 17 becomes too small and there is a possibility that the liquefied gas carrying capacity required for the liquefied gas carrier 1 cannot be satisfied, so B/D is less than 2. It is.

Ｂ／Ｄは小さい方が液化ガスタンク１７の直径Ｄを大きくできるため、積載可能容積を大きくできる点では有利である。ただしＢ／Ｄが５／３以下になると船側７３と液化ガスタンク１７の距離が近くなりすぎ、IGC code（ガスキャリアコード）で定める損傷時の復原性を維持するために貨物区画７内の水密区画の数を減らせなくなり、タンク長を伸ばせなくなる。そのためＢ／Ｄは５／３超である。IGC codeとはInternational Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulkの略称であり、国際海事機関（IMO）が規定する液化ガス運搬船の国際規則である。 A smaller B/D allows the diameter D of the liquefied gas tank 17 to be increased, which is advantageous in that the loadable volume can be increased. However, if B/D becomes 5/3 or less, the distance between the ship's side 73 and the liquefied gas tank 17 becomes too close, and in order to maintain stability in the event of damage as specified by the IGC code (gas carrier code), a watertight section in the cargo compartment 7 is required. It becomes impossible to reduce the number of tanks, and it becomes impossible to increase the tank length. Therefore, B/D is more than 5/3. The IGC code is an abbreviation for the International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk, and is an international code for liquefied gas carriers stipulated by the International Maritime Organization (IMO).

液化ガス運搬船１はＢ／Ｄが以下の式（２）で示す関係を満たすことが好ましい。
（５／３）＜（Ｂ／Ｄ）＜（１７／１０） …式（２）
式（２）は式（１）において上限をより小さな１７／１０にしたものである。式（２）の上限を満たすことで、式（１）よりも液化ガスタンク１７の直径Ｄをさらに大きくできるため、積載可能容積を大きくできる点で益々有利である。 It is preferable that B/D of the liquefied gas carrier 1 satisfies the relationship shown by the following equation (2).
(5/3)<(B/D)<(17/10)...Formula (2)
Equation (2) is obtained by changing the upper limit of Equation (1) to a smaller value of 17/10. By satisfying the upper limit of formula (2), the diameter D of the liquefied gas tank 17 can be made larger than that of formula (1), which is even more advantageous in that the loadable volume can be increased.

なお、積載可能容積を大きくする手段としては図１に示す船体３の全長ＬOAを長くして貨物区画７を船長方向に長くすることでタンク長を長くする手段もあるが、全長ＬOAが長過ぎると旋回性能等の運動性能が悪くなる。そのため、全長ＬOAは積載可能容積と運動性能の兼ね合いで適宜設定する。具体的には型幅Ｂと全長ＬOAの関係が以下の式（３）を満たせば、積載可能容積と運動性能を両立できる。
４．５≦（ＬOA／Ｂ）≦６ …式（３） In addition, as a means to increase the loadable capacity, there is also a method of increasing the tank length by increasing the overall length L OA of the hull 3 shown in Fig. 1 and lengthening the cargo compartment 7 in the ship's direction, but if the overall length L OA is If it is too long, motion performance such as turning performance will deteriorate. Therefore, the overall length L OA is set appropriately based on the balance between loadable volume and maneuverability. Specifically, if the relationship between mold width B and overall length L OA satisfies the following equation (3), both loadable volume and motion performance can be achieved.
4.5≦(L OA /B)≦6 …Formula (3)

貨物区画７は左右の船側７３が二重船側構造を備えるのが好ましい。例えば図４では左右の船側７３の全体が、船外に露出する外側船側７３ａと、外側船側７３ａよりも船内側に配置された内側船側７３ｂを備えた二重船側構造である。
外側船側７３ａと内側船側７３ｂは横隔壁である複数の二重船側隔壁７７で連結され、外側船側７３ａ、内側船側７３ｂ、二重船側隔壁７７、船底７１、及び暴露甲板６１で囲まれた複数の区画が二重船側区画７９を構成する。二重船側区画７９は水密区画であり、例えばバラストタンクである。 It is preferable that the cargo compartment 7 has the left and right ship sides 73 having a double ship side structure. For example, in FIG. 4, the entire left and right ship sides 73 have a double ship side structure including an outer ship side 73a exposed to the outside of the ship, and an inner ship side 73b arranged inward of the outer ship side 73a.
The outer ship side 73a and the inner ship side 73b are connected by a plurality of double side bulkheads 77, which are transverse bulkheads. The compartments constitute a double side compartment 79. The double side compartment 79 is a watertight compartment, for example a ballast tank.

貨物区画７の左右の船側７３が二重船側構造を備えることで、外側船側７３ａが損傷して浸水した場合でも内側船側７３ｂ及び二重船側隔壁７７で浸水が阻止され、浸水は損傷個所に接する１つの二重船側区画７９に限られる。
そのため、浸水時に液化ガスタンク１７が損傷する可能性がさらに低下するので、貨物区画７の貨物倉横隔壁３１の数をさらに削減できる。 Since the left and right ship sides 73 of the cargo compartment 7 are provided with a double ship side structure, even if the outer ship side 73a is damaged and flooded, the water will be blocked by the inner ship side 73b and the double ship side bulkhead 77, and the water will come into contact with the damaged area. Limited to one double side compartment 79.
Therefore, the possibility that the liquefied gas tank 17 will be damaged when flooded is further reduced, and the number of cargo hold horizontal bulkheads 31 in the cargo compartment 7 can be further reduced.

液化ガスタンク１７を軽量化する観点からは液化ガスタンク１７の数は少ない方が好ましく、１つであるのが最も好ましい。ただし液化ガスタンク１７の数が減るほど貨物区画７内の水密区画の数が減って浸水時の復原性が悪化する。また液化ガスタンク１７は製造工場の設備の大きさで製造できるタンクサイズが制約される。そのため液化ガスタンク１７の数は、浸水時の復原性の観点で決定される貨物倉横隔壁３１の数と船長方向の設置間隔、及び液化ガスタンク１７を製造する工場が製造可能な液化ガスタンク１７のタンクサイズで決まる。これらの条件次第ではタンク数が１つでもよいし、図５に示すように３つでもよい。あるいは４つ以上でもよい。 From the viewpoint of reducing the weight of the liquefied gas tank 17, the number of liquefied gas tanks 17 is preferably small, and most preferably one. However, as the number of liquefied gas tanks 17 decreases, the number of watertight compartments in the cargo compartment 7 decreases, and the stability during flooding deteriorates. Further, the size of the liquefied gas tank 17 that can be manufactured is limited by the size of the equipment at the manufacturing factory. Therefore, the number of liquefied gas tanks 17 is determined by the number of cargo hold horizontal bulkheads 31 and the installation spacing in the longitudinal direction, which are determined from the viewpoint of stability in the event of flooding, and the number of liquefied gas tanks 17 that can be manufactured by the factory that manufactures liquefied gas tanks 17. Determined by size. Depending on these conditions, the number of tanks may be one or three as shown in FIG. Alternatively, there may be four or more.

ただし貨物積載可能容積が１００００ｍ3以上の液化ガス運搬船１は液化ガスタンク１７の数が３つ以下であるのが好ましい。貨物積載可能容積が１００００ｍ3以上の液化ガス運搬船１は河川用船舶としてはタンク重量が大きくなりやすく、容積効率も向上させ難いため、液化ガスタンク１７の数を極力減らしてタンク重量を削減する要求が強いためである。 However, in a liquefied gas carrier 1 having a cargo loading capacity of 10,000 m 3 or more, it is preferable that the number of liquefied gas tanks 17 is three or less. For a liquefied gas carrier 1 with a cargo loading capacity of 10,000 m3 or more, the tank weight tends to be large for a river vessel, and it is difficult to improve the volumetric efficiency.Therefore, there is a demand to reduce the number of liquefied gas tanks 17 as much as possible to reduce the tank weight. It's because it's strong.

液化ガスタンク１７の具体的な構造は貯蔵する液化ガスの種類や貯蔵時の温度や圧力に応じて適宜設定する。液化ガスタンク１７を船体３に固定する構造も、液化ガスを貯蔵した液化ガスタンク１７を支持できる構造であれば、公知のスカート構造等を用いればよい。
特に液化ガスタンク１７は、液化ガスを－８０度以下で貯蔵可能な材料で構成されるのが好ましい。メタンやエタンのように―８０℃以下で液化するガスを貯蔵できるためである。なお液化ガスを－８０度以下で貯蔵する液化ガスタンク１７は材料が高価であるため、材料の使用量を減らしてコストを削減するためにタンク重量を削減する要求が強い。そのため、タンク重量を削減できる本実施形態の構造は、液化ガスを－８０度以下で貯蔵する場合に好適である。 The specific structure of the liquefied gas tank 17 is appropriately set depending on the type of liquefied gas to be stored and the temperature and pressure during storage. As the structure for fixing the liquefied gas tank 17 to the hull 3, a known skirt structure or the like may be used as long as the structure can support the liquefied gas tank 17 storing liquefied gas.
In particular, the liquefied gas tank 17 is preferably made of a material that can store the liquefied gas at -80 degrees Celsius or lower. This is because gases such as methane and ethane that liquefy at temperatures below -80°C can be stored. The liquefied gas tank 17, which stores liquefied gas at -80 degrees Celsius or below, is made of expensive materials, so there is a strong demand to reduce the weight of the tank in order to reduce the amount of materials used and cost. Therefore, the structure of this embodiment, which can reduce the weight of the tank, is suitable for storing liquefied gas at -80 degrees Celsius or lower.

図１の液化ガスタンク１７の一部は、貨物区画７に設置した状態で機関区画５の上方の暴露甲板６１よりも上方にある。そのため液化ガスタンク１７の上方には暴露甲板６１が設けられずに、貨物タンクカバー１９が設けられる。貨物タンクカバー１９は液化ガスタンク１７の暴露甲板６１よりも上方にある部分を覆って保護するカバーであり、暴露甲板６１よりも高い位置に設けられる。ただし液化ガスタンク１７の全部が暴露甲板６１よりも低い位置にある場合、暴露甲板６１が液化ガスタンク１７の上方を覆うので、貨物タンクカバー１９は不要である。 A portion of the liquefied gas tank 17 in FIG. 1 is located above the exposed deck 61 above the engine compartment 5 when installed in the cargo compartment 7. Therefore, the exposure deck 61 is not provided above the liquefied gas tank 17, but the cargo tank cover 19 is provided. The cargo tank cover 19 is a cover that covers and protects a portion of the liquefied gas tank 17 located above the exposure deck 61, and is provided at a higher position than the exposure deck 61. However, if all of the liquefied gas tanks 17 are located at a lower position than the exposure deck 61, the cargo tank cover 19 is not necessary because the exposure deck 61 covers the upper part of the liquefied gas tanks 17.

図１に示すように液化ガスタンク１７はベントマスト１０を備える。ベントマスト１０は、液化ガスタンク１７が貯蔵する液化ガスの揮発分を排出することでタンク内の圧力上昇を防ぐベント管である。図１のベントマスト１０は貨物タンクカバー１９の頂部から上方に突設されている。
図１に示すベントマスト１０の頂部と貨物タンクカバー１９の頂部の間の鉛直距離ＨBは６ｍ未満であるのが好ましい。
鉛直距離ＨBが６ｍ未満であると、ベントマスト１０を備えていてもエアドラフトを低くできるため、河川にかかる橋の下の水路のように、エアドラフト制限が厳しい水路を液化ガス運搬船１が通過できる。 As shown in FIG. 1, the liquefied gas tank 17 includes a vent mast 10. The vent mast 10 is a vent pipe that prevents an increase in pressure within the tank by discharging volatile components of the liquefied gas stored in the liquefied gas tank 17. The vent mast 10 in FIG. 1 projects upward from the top of the cargo tank cover 19.
The vertical distance H B between the top of the vent mast 10 and the top of the cargo tank cover 19 shown in Figure 1 is preferably less than 6 m.
If the vertical distance H B is less than 6 m, the air draft can be lowered even with the vent mast 10, so the liquefied gas carrier 1 can navigate waterways with strict air draft restrictions, such as waterways under bridges spanning rivers. Can pass.

図１に示すように液化ガスタンク１７はタンクドーム２７を備える。タンクドーム２７は液化ガスタンク１７に液化ガスを導入する際の入口となる筒状の構造物であり、液化ガスタンク１７のタンク上端から上方に突設される。
図３に示すように液化ガスタンク１７が２つの場合、船長方向における中心位置よりも、隣接する他の液化ガスタンク１７に近い位置にタンクドーム２７が設けられるのが好ましい。
図３に示す液化ガス運搬船１は船長方向において船尾側に配置された船尾側液化ガスタンク１７ａと、船首側に配置された船首側液化ガスタンク１７ｂの２つの液化ガスタンク１７を備える。船尾側液化ガスタンク１７ａは、中心位置ＣＬaよりも船首側液化ガスタンク１７ｂに近い位置にタンクドーム２７ａが設けられる。同様に船首側液化ガスタンク１７ｂは、中心位置ＣＬbよりも船尾側液化ガスタンク１７ａに近い位置にタンクドーム２７ｂが設けられる。
この構成では２つの液化ガスタンク１７のタンクドーム２７が近接配置される。タンクドーム２７は液化ガスタンク１７に液化ガスを導入する際の入口であるため、液化ガスを導入する配管等の設備が設置される。そのため、タンクドーム２７を近接配置することで配管等の設備を短くでき、重量削減に益々有利となる。 As shown in FIG. 1, the liquefied gas tank 17 includes a tank dome 27. The tank dome 27 is a cylindrical structure that serves as an inlet for introducing liquefied gas into the liquefied gas tank 17, and is provided to protrude upward from the upper end of the liquefied gas tank 17.
As shown in FIG. 3, when there are two liquefied gas tanks 17, it is preferable that the tank dome 27 is provided at a position closer to another adjacent liquefied gas tank 17 than the center position in the longitudinal direction.
The liquefied gas carrier 1 shown in FIG. 3 includes two liquefied gas tanks 17: a stern liquefied gas tank 17a located on the stern side in the ship's length direction, and a bow liquefied gas tank 17b located on the bow side. The stern side liquefied gas tank 17a is provided with a tank dome 27a at a position closer to the bow side liquefied gas tank 17b than the center position CL a . Similarly, the bow liquefied gas tank 17b is provided with a tank dome 27b at a position closer to the stern liquefied gas tank 17a than the center position CL b .
In this configuration, the tank domes 27 of the two liquefied gas tanks 17 are arranged close to each other. Since the tank dome 27 is an inlet for introducing liquefied gas into the liquefied gas tank 17, equipment such as piping for introducing the liquefied gas is installed therein. Therefore, by arranging the tank dome 27 close to each other, equipment such as piping can be shortened, which is even more advantageous in weight reduction.

例えば図１の液化ガス運搬船１は船長方向においてタンクドーム２７間の上甲板である暴露甲板６１上側にマニフォールド２９が設けられる。マニフォールド２９は液化ガスタンク１７と、陸上の液化ガス貯蔵施設との間を連結する管であり、一端がタンクドーム２７に接続され、他端が陸上の液化ガス貯蔵施設に接続される。
このようにタンクドーム２７間の上甲板上側にマニフォールド２９を設けることで、液化ガスの搬出入に係る配管をさらに短くできる。 For example, in the liquefied gas carrier 1 shown in FIG. 1, the manifold 29 is provided above the exposure deck 61, which is the upper deck between the tank domes 27 in the ship's ship direction. The manifold 29 is a pipe that connects the liquefied gas tank 17 and a liquefied gas storage facility on land, with one end connected to the tank dome 27 and the other end connected to the liquefied gas storage facility on land.
By providing the manifold 29 above the upper deck between the tank domes 27 in this way, the piping involved in carrying in and out the liquefied gas can be further shortened.

船首区画９は図示しないサイドスラスターや投錨装置が設けられる区画であり、船長方向において船体３の最も船首側の区画である。
図１に示すように船首区画９の船尾側端部は水密隔壁である貨物隔壁２１で貨物区画７と分離されている。 The bow section 9 is a section in which a side thruster and an anchoring device (not shown) are provided, and is the section closest to the bow of the hull 3 in the ship's direction.
As shown in FIG. 1, the stern end of the bow compartment 9 is separated from the cargo compartment 7 by a cargo bulkhead 21 that is a watertight bulkhead.

船首区画９の暴露甲板６１上には船橋２３が設けられる。
船橋２３は船員の居住区及び操船の指揮所となる多層の上部構造物であり、下層には船員の居住区が配置され、上層には指揮所が配置される。
図１に示すように船橋２３は船首区画９上の暴露甲板６１に設けられており、貨物区画７よりも船首側に設けられる。 A bridge 23 is provided on the exposed deck 61 of the bow compartment 9.
The bridge 23 is a multi-layered superstructure that serves as a living quarters for sailors and a command center for ship operation, with the living quarters for the sailors arranged in the lower layer and the command center arranged in the upper layer.
As shown in FIG. 1, the bridge 23 is provided on the exposed deck 61 above the bow compartment 9, and is provided closer to the bow than the cargo compartment 7.

このように貨物区画７よりも船首側に船橋２３を設けることで、貨物区画７よりも船尾側の機関区画５の上方に船橋２３を設ける場合よりも機関区画５の船長方向の長さを小さくでき、貨物区画７の船長方向長さを大きくできる。そのため、液化ガスタンク１７のタンク長を長くでき、容積を小さくせずにタンク重量を軽くするのに益々有利である。 By providing the bridge 23 on the bow side of the cargo compartment 7 in this way, the length of the engine compartment 5 in the longitudinal direction can be made smaller than when the bridge 23 is provided above the engine compartment 5 on the stern side of the cargo compartment 7. This allows the length of the cargo compartment 7 in the longitudinal direction to be increased. Therefore, the length of the liquefied gas tank 17 can be increased, which is more advantageous in reducing the weight of the tank without reducing its volume.

図１に示す船橋２３は天井から上方にレーダーマスト１２が突設されている。レーダーマスト１２は液化ガス運搬船１が安全に航海するためや、外部と通信を行うのに必要な設備が設置された帆柱であり、具体的には航海灯、レーダーアンテナ、信号灯、無線用アンテナ、海事衛星用パラボラアンテナ等が設置される。
液化ガス運搬船１は、レーダーマスト１２のような暴露甲板６１上の上部構造物のうち、図２に示す、頂部が最も高い位置にある上部構造物の頂部と計画吃水線ＬＷＬの間の鉛直方向距離ＨLが２４ｍ以下であるのが好ましい。
「頂部が最も高い位置」とは、上部構造物が起倒式のマストのように、高さを変えられる構造の場合、マストを倒した状態のように高さが最も低い状態で比較して頂部が最も高い位置を意味する。
この構造では液化ガス運搬船１がレーダーマスト１２を備えていてもエアドラフトを低くできるため、河川にかかる橋の下の水路のように、エアドラフト制限が厳しい水路を通過できる。 The bridge 23 shown in FIG. 1 has a radar mast 12 projecting upward from the ceiling. The radar mast 12 is a mast that is equipped with equipment necessary for the liquefied gas carrier 1 to sail safely and communicate with the outside world, and specifically includes navigation lights, radar antennas, signal lights, radio antennas, A parabolic antenna for maritime satellites will be installed.
The liquefied gas carrier 1 is located in the vertical direction between the top of the superstructure whose top is at the highest position and the planned water line LWL, which is shown in FIG. 2 among the superstructures on the exposed deck 61 such as the radar mast 12. Preferably, the distance H L is 24 m or less.
``The highest position at the top'' means that when the upper structure has a structure that can change the height, such as a collapsible mast, the height is the lowest, such as when the mast is folded down. The top means the highest position.
With this structure, even if the liquefied gas carrier 1 is equipped with the radar mast 12, the air draft can be lowered, so that it can pass through waterways with strict air draft restrictions, such as waterways under bridges spanning rivers.

貨物機器室３３は液化ガスタンク１７内の液化ガスの温度や圧力を制御する機器である貨物機器が配置される部屋である。貨物機器室３３の設置位置は他の設備と干渉しない位置で、かつ液化ガスタンク１７から離れすぎない位置が好ましい。 The cargo equipment room 33 is a room in which cargo equipment that controls the temperature and pressure of the liquefied gas in the liquefied gas tank 17 is arranged. The installation position of the cargo equipment room 33 is preferably a position where it does not interfere with other equipment and is not too far away from the liquefied gas tank 17.

例えば図１に示すように複数の液化ガスタンク１７が直列配置されており、長手方向両端が半球状のようなタンクの外側に向かって凸な曲面の場合、液化ガスタンク１７の長手方向の最先端部１６より上方で、貨物区画７における液化ガスタンク１７の半球状の部分と、貨物倉横隔壁３１との間の空間に貨物機器室３３を設けてもよい。
具体的には、液化ガスタンク１７の両端が半球状の場合、長手方向の最先端部１６の上方で、かつ液化ガスタンク１７の半球状の部分と貨物倉横隔壁３１の間には空間が生じる。この空間に貨物機器室３３を配置する。
この構造では貨物機器室３３の頂部がタンク頂部を大きく超えないため、上部構造物の高さを抑制できる。
また、この構造では、貨物倉横隔壁３１を貨物機器室３３の側壁とすることで、側壁を別途設置する必要がなく、コストや製造工数の点で有利である。
さらに図１のように液化ガスタンク１７の上方が貨物タンクカバー１９で覆われている場合、貨物タンクカバー１９を貨物機器室３３の天井とすれば、天井を別途設置する必要もなく、コストや製造工数の点で益々有利である。ただし、貨物タンクカバー１９を貨物機器室３３の天井とすると貨物機器室３３の高さが不足する場合は、貨物機器室３３の一部を貨物タンクカバー１９の上方に突設し、天井を別に設けてもよい。なお、液化ガスタンク１７が暴露甲板６１よりも上方に位置しない等の理由で貨物タンクカバー１９がない場合は、暴露甲板６１を貨物機器室３３の天井とするか、貨物機器室３３の一部を暴露甲板６１の上方に突設し、天井を別に設ければよい。 For example, if a plurality of liquefied gas tanks 17 are arranged in series as shown in FIG. A cargo equipment compartment 33 may be provided above 16 in the space between the hemispherical portion of the liquefied gas tank 17 in the cargo compartment 7 and the cargo hold transverse bulkhead 31 .
Specifically, when both ends of the liquefied gas tank 17 are hemispherical, a space is created above the leading end 16 in the longitudinal direction and between the hemispherical portion of the liquefied gas tank 17 and the cargo hold horizontal bulkhead 31. A cargo equipment room 33 is arranged in this space.
With this structure, the top of the cargo equipment room 33 does not greatly exceed the top of the tank, so the height of the superstructure can be suppressed.
Further, in this structure, by using the cargo hold horizontal bulkhead 31 as a side wall of the cargo equipment compartment 33, there is no need to separately install a side wall, which is advantageous in terms of cost and manufacturing man-hours.
Furthermore, if the upper part of the liquefied gas tank 17 is covered with a cargo tank cover 19 as shown in FIG. This is more advantageous in terms of man-hours. However, if the height of the cargo equipment room 33 is insufficient when the cargo tank cover 19 is used as the ceiling of the cargo equipment room 33, a part of the cargo equipment room 33 may be protruded above the cargo tank cover 19, and the ceiling may be set separately. It may be provided. In addition, if there is no cargo tank cover 19 because the liquefied gas tank 17 is not located above the exposure deck 61, the exposure deck 61 may be the ceiling of the cargo equipment room 33, or a part of the cargo equipment room 33 may be It is sufficient to protrude above the exposure deck 61 and provide a separate ceiling.

船橋２３を船首区画９の暴露甲板６１に設けている場合、貨物機器室３３の全部若しくは一部を機関区画５の上方に配置してもよい。図６では貨物機器室３３の全部を機関区画５の上方に配置している。この構造では、船橋２３を機関区画５の上方に設置する場合に船橋２３が設けられる位置に貨物機器室３３が設けられる。
この構造では液化ガスタンク１７の上方ではなく、液化ガスタンク１７から船尾側にずれた位置に貨物機器室３３が配置されるため、上部構造物の高さを抑制できる。 When the bridge 23 is provided on the exposed deck 61 of the bow compartment 9, all or part of the cargo equipment compartment 33 may be located above the engine compartment 5. In FIG. 6, the entire cargo equipment room 33 is arranged above the engine compartment 5. In this structure, the cargo equipment room 33 is provided at the position where the bridge 23 is installed when the bridge 23 is installed above the engine compartment 5.
In this structure, the cargo equipment room 33 is arranged not above the liquefied gas tank 17 but at a position shifted toward the stern from the liquefied gas tank 17, so that the height of the upper structure can be suppressed.

機関区画５の上方に貨物機器室３３を設置する場合、暴露甲板６１を貨物機器室３３の床面３３ａにしてもよい。
ただし貨物機器室３３の床面３３ａを暴露甲板６１よりも高い位置に設けた高床構造にしてもよい。具体的には図６に示すように、暴露甲板６１上に設置された脚部１４に貨物機器室３３の床面３３ａを支持させることで、床面３３ａを暴露甲板６１よりも高い位置に設置すればよい。この場合、床面３３ａと暴露甲板６１の間を側壁等で囲む必要はなく、床面３３ａの下方の暴露甲板６１が船外に露出した状態にしてよい。
この構造では貨物機器室３３の床面３３ａと暴露甲板６１の間に空間が生じるため、係船機等を設けるスペースを貨物機器室３３の下方の暴露甲板６１上に確保できる。
以上が本実施形態に係る液化ガス運搬船１の構成の説明である。 When installing the cargo equipment room 33 above the engine compartment 5, the exposed deck 61 may be the floor surface 33a of the cargo equipment room 33.
However, the cargo equipment room 33 may have a raised floor structure in which the floor 33a is located higher than the exposed deck 61. Specifically, as shown in FIG. 6, the floor 33a of the cargo equipment room 33 is supported by the legs 14 installed on the exposure deck 61, so that the floor 33a is installed at a higher position than the exposure deck 61. do it. In this case, there is no need to surround the space between the floor surface 33a and the exposed deck 61 with a side wall or the like, and the exposed deck 61 below the floor surface 33a may be exposed to the outside of the ship.
In this structure, a space is created between the floor surface 33a of the cargo equipment room 33 and the exposed deck 61, so that a space for installing a mooring machine or the like can be secured on the exposed deck 61 below the cargo equipment room 33.
The above is the explanation of the configuration of the liquefied gas carrier 1 according to the present embodiment.

このように本実施形態の液化ガス運搬船１は、バイローブタンクより軽量な円筒状の液化ガスタンク１７を１つ配置するか、又は複数を直列配置して船側７３とタンクの距離を長くする。
この構成では船幅を広くせずに浸水時のタンク損傷を抑制して横隔壁数を減らすことでタンク長を長くしてタンク数を減らして容積を維持しつつタンク重量を抑制する。
そのため、貨物容積を小さくせずにタンク重量を軽くでき、船幅が広くなるのも抑制できる。 In this way, the liquefied gas carrier 1 of this embodiment has one cylindrical liquefied gas tank 17 that is lighter than the bilobed tank, or a plurality of cylindrical liquefied gas tanks 17 are arranged in series to increase the distance between the ship side 73 and the tank.
With this configuration, tank damage during flooding is suppressed without widening the ship, and by reducing the number of transverse bulkheads, the tank length is increased and the number of tanks is reduced to maintain volume and reduce tank weight.
Therefore, the weight of the tank can be reduced without reducing the cargo volume, and the width of the ship can be prevented from increasing.

以上、実施形態を参照して本発明を説明したが、本発明は実施形態に限定されない。当業者であれば、本発明の技術思想の範囲内において各種変形例及び改良例に想到するのは当然のことであり、これらも本発明に含まれる。 Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the embodiments. It is natural for those skilled in the art to come up with various modifications and improvements within the scope of the technical idea of the present invention, and these are also included in the present invention.

１ ：液化ガス運搬船
３ ：船体
５ ：機関区画
６ ：プロペラ
７ ：貨物区画
９ ：船首区画
１０ ：ベントマスト
１１ ：エンジンケーシング
１２ ：レーダーマスト
１３ ：化粧煙突
１４ ：脚部
１５ ：機関隔壁
１６ ：最先端部
１７ ：液化ガスタンク
１７ａ ：船尾側液化ガスタンク
１７ｂ ：船首側液化ガスタンク
１９ ：貨物タンクカバー
２１ ：貨物隔壁
２３ ：船橋
２７ ：タンクドーム
２７ａ ：船尾側タンクドーム
２７ｂ ：船首側タンクドーム
２９ ：マニフォールド
３１ ：貨物倉横隔壁
３３ ：貨物機器室
３３ａ ：床面
６１ ：暴露甲板
７１ ：船底
７３ ：船側
７３ａ ：外側船側
７３ｂ ：内側船側
７７ ：二重船側隔壁
７９ ：二重船側区画 1: Liquefied gas carrier 3: Hull 5: Engine compartment 6: Propeller 7: Cargo compartment 9: Bow compartment 10: Vent mast 11: Engine casing 12: Radar mast 13: Decorative chimney 14: Legs 15: Engine bulkhead 16: Top Tip part 17: Liquefied gas tank 17a: Stern side liquefied gas tank 17b: Bow side liquefied gas tank 19: Cargo tank cover 21: Cargo bulkhead 23: Bridge 27: Tank dome 27a: Stern side tank dome 27b: Forward side tank dome 29: Manifold 31 : Cargo hold transverse bulkhead 33 : Cargo equipment room 33a : Floor 61 : Exposed deck 71 : Bottom 73 : Ship side 73a : Outer ship side 73b : Inner ship side 77 : Double ship side bulkhead 79 : Double ship side compartment

Claims (14)

貨物である液化ガスの積載可能容積が５００００ｍ ３ 以下の液化ガス運搬船であって、
前記液化ガスが積載される区画である貨物区画を備える船体と、
円筒状の独立タンクで長手方向が船長方向を向くように前記貨物区画に１つ配置されるか、又は複数が直列配置されて前記液化ガスを貯蔵する液化ガスタンクと、
を備え、
型幅をＢ、前記液化ガスタンクの円筒の直径をＤとした場合に、以下の式（２）で示す関係を満たすことを特徴とする液化ガス運搬船。
（５／３）＜（Ｂ／Ｄ）＜（１７／１０） …式（２） A liquefied gas carrier with a capacity for carrying liquefied gas as cargo of 50,000 m3 or less ,
A ship body comprising a cargo compartment in which the liquefied gas is loaded;
A liquefied gas tank in which one cylindrical independent tank is placed in the cargo compartment with its longitudinal direction facing the ship length direction, or a plurality of cylindrical independent tanks are arranged in series to store the liquefied gas;
Equipped with
A liquefied gas carrier, characterized in that it satisfies the relationship expressed by the following equation (2), where B is the mold width and D is the diameter of the cylinder of the liquefied gas tank .
(5/3)<(B/D)<(17/10)...Formula (2) 貨物積載可能容積が１００００ｍCargo loading capacity is 10,000m ３3 以上であり、前記液化ガスタンクの数が３つ以下である請求項１に記載の液化ガス運搬船。The liquefied gas carrier according to claim 1, wherein the number of liquefied gas tanks is three or less. 前記船体は、
船尾から船首に向けて順に設けられた機関区画、前記貨物区画、及び船首区画と、
前記船首区画の暴露甲板に設けられた船橋と、
を備えることを特徴とする請求項１又は２に記載の液化ガス運搬船。 The hull is
a machinery compartment, the cargo compartment, and a bow compartment provided in order from the stern to the bow;
a bridge provided on the exposed deck of the bow compartment;
The liquefied gas carrier according to claim 1 or 2, comprising: 前記貨物区画は、左右の船側が二重船側構造を備える請求項１又は２に記載の液化ガス運搬船。 The liquefied gas carrier according to claim 1 or 2, wherein the cargo compartment has a double side structure on left and right sides. 計画吃水が６ｍ未満である請求項１又は２に記載の液化ガス運搬船。 The liquefied gas carrier according to claim 1 or 2, wherein the planned water intake is less than 6 m. 前記船体の船尾に並列配置され、前記船体を船長方向に推進させる複数の推進機構を備える請求項１又は２に記載の液化ガス運搬船。 The liquefied gas carrier according to claim 1 or 2, comprising a plurality of propulsion mechanisms that are arranged in parallel at the stern of the hull and propel the hull in a longitudinal direction. 貨物である液化ガスの積載可能容積が５００００ｍ ３ 以下の液化ガス運搬船であって、
前記液化ガスが積載される区画である貨物区画を備える船体と、
円筒状の独立タンクで長手方向が船長方向を向くように前記貨物区画に１つ配置されるか、又は複数が直列配置されて前記液化ガスを貯蔵する液化ガスタンクと、
を備え、
型幅をＢ、前記液化ガスタンクの円筒の直径をＤとした場合に、以下の式（１）で示す関係を満たし、
前記液化ガスタンクは長手方向両端がタンクの外側に向かって凸な曲面であり、複数が直列配置され、
前記貨物区画は、
複数の前記液化ガスタンクの間に設けられた水密隔壁である貨物倉横隔壁と、
前記液化ガスタンクの長手方向の最先端部より上方で、かつ前記液化ガスタンクの前記曲面の部分と前記貨物倉横隔壁の間の空間に配置された貨物機器室を備えることを特徴とする液化ガス運搬船。
（５／３）＜（Ｂ／Ｄ）＜２ …式（１） A liquefied gas carrier with a capacity for carrying liquefied gas as cargo of 50,000 m3 or less ,
A ship body comprising a cargo compartment in which the liquefied gas is loaded;
A liquefied gas tank in which one cylindrical independent tank is placed in the cargo compartment with its longitudinal direction facing the ship length direction, or a plurality of cylindrical independent tanks are arranged in series to store the liquefied gas;
Equipped with
When the mold width is B and the diameter of the cylinder of the liquefied gas tank is D, the relationship shown in the following formula (1) is satisfied,
The liquefied gas tank has a curved surface that is convex at both longitudinal ends toward the outside of the tank, and a plurality of liquefied gas tanks are arranged in series,
The cargo compartment is
a cargo hold horizontal bulkhead that is a watertight bulkhead provided between the plurality of liquefied gas tanks;
A liquefied gas carrier comprising: a cargo equipment room disposed above the longitudinally most forward end of the liquefied gas tank and in a space between the curved surface portion of the liquefied gas tank and the cargo hold horizontal bulkhead. .
(5/3)<(B/D)<2...Formula (1) 前記機関区画の上方に、貨物機器室の全部若しくは一部を配置する請求項３に記載の液化ガス運搬船。 The liquefied gas carrier according to claim 3, wherein all or part of a cargo equipment room is arranged above the engine compartment. 貨物である液化ガスの積載可能容積が５００００ｍ ３ 以下の液化ガス運搬船であって、
前記液化ガスが積載される区画である貨物区画を備える船体と、
円筒状の独立タンクで長手方向が船長方向を向くように前記貨物区画に１つ配置されるか、又は複数が直列配置されて前記液化ガスを貯蔵する液化ガスタンクと、
を備え、
型幅をＢ、前記液化ガスタンクの円筒の直径をＤとした場合に、以下の式（１）で示す関係を満たし、
前記船体は、船尾から船首に向けて順に設けられた機関区画、前記貨物区画、及び船首区画と、前記船首区画の暴露甲板に設けられた船橋とを備え、
前記機関区画の上方に、貨物機器室の全部若しくは一部を配置し、
前記貨物機器室の床面が、前記暴露甲板上に設置された脚部に支持されて前記暴露甲板よりも高い位置にあり、前記床面の下方の前記暴露甲板が船外に露出していることを特徴とする液化ガス運搬船。
（５／３）＜（Ｂ／Ｄ）＜２ …式（１） A liquefied gas carrier with a capacity for carrying liquefied gas as cargo of 50,000 m3 or less ,
A ship body comprising a cargo compartment in which the liquefied gas is loaded;
A liquefied gas tank in which one cylindrical independent tank is placed in the cargo compartment with its longitudinal direction facing the ship length direction, or a plurality of cylindrical independent tanks are arranged in series to store the liquefied gas;
Equipped with
When the mold width is B and the diameter of the cylinder of the liquefied gas tank is D, the relationship shown in the following formula (1) is satisfied,
The hull includes a machinery compartment, a cargo compartment, and a bow compartment provided in order from the stern to the bow, and a bridge provided on the exposed deck of the bow compartment,
All or part of the cargo equipment room is located above the machinery compartment,
The floor of the cargo equipment room is supported by legs installed on the exposure deck and is at a higher position than the exposure deck, and the exposure deck below the floor is exposed to the outside of the ship. A liquefied gas carrier.
(5/3)<(B/D)<2...Formula (1) 前記液化ガスタンクのうち隣り合う２つのタンクにおいて、
船長方向における中心位置よりも、隣接する他の前記液化ガスタンクに近い位置のタンク上端から上方に突設され、前記液化ガスタンクに前記液化ガスを導入する際の入口となるタンクドームを備える請求項１又は２に記載の液化ガス運搬船。 In two adjacent tanks among the liquefied gas tanks,
Claim 1, further comprising a tank dome that protrudes upward from the upper end of the tank at a position closer to the other adjacent liquefied gas tank than the center position in the longitudinal direction, and serves as an inlet when introducing the liquefied gas into the liquefied gas tank. Or the liquefied gas carrier according to 2. 前記液化ガスタンクと陸上の液化ガス貯蔵施設との間を連結する管であるマニフォールドが船長方向において前記タンクドーム間の上甲板上側に設けられる請求項１０に記載の液化ガス運搬船。 The liquefied gas carrier according to claim 10, wherein a manifold, which is a pipe connecting the liquefied gas tank and an onshore liquefied gas storage facility, is provided above the upper deck between the tank domes in the longitudinal direction. 暴露甲板上の上部構造物のうち、頂部が最も高い位置にある上部構造物の頂部と計画吃水線の間の鉛直方向距離が２４ｍ以下である請求項１又は２に記載の液化ガス運搬船。 The liquefied gas carrier according to claim 1 or 2, wherein the vertical distance between the top of the superstructure having the highest top among the superstructures on the exposed deck and the planned water line is 24 m or less. 前記液化ガスタンクの一部は暴露甲板よりも上方にあり、
前記船体は、前記液化ガスタンクの前記暴露甲板よりも上方にある部分を覆う貨物タンクカバーを備え、
前記液化ガスタンクは、貯蔵している前記液化ガスの揮発分を排出するベント管を備えるベントマストを備え、
前記ベントマストの頂部と前記貨物タンクカバーの頂部の鉛直方向距離が６ｍ未満である請求項１又は２に記載の液化ガス運搬船。 A portion of the liquefied gas tank is located above the exposure deck;
The hull includes a cargo tank cover that covers a portion of the liquefied gas tank above the exposed deck,
The liquefied gas tank includes a vent mast that includes a vent pipe that discharges volatile components of the stored liquefied gas,
The liquefied gas carrier according to claim 1 or 2, wherein a vertical distance between the top of the vent mast and the top of the cargo tank cover is less than 6 m. 前記液化ガスタンクは、前記液化ガスを－８０度以下で貯蔵可能な材料で構成される請求項１又は２に記載の液化ガス運搬船。 The liquefied gas carrier according to claim 1 or 2, wherein the liquefied gas tank is made of a material capable of storing the liquefied gas at -80 degrees Celsius or lower.
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