GB2410471A - An LNG carrier vessel with spherical tanks and a double bottom - Google Patents

An LNG carrier vessel with spherical tanks and a double bottom Download PDF

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Publication number
GB2410471A
GB2410471A GB0401847A GB0401847A GB2410471A GB 2410471 A GB2410471 A GB 2410471A GB 0401847 A GB0401847 A GB 0401847A GB 0401847 A GB0401847 A GB 0401847A GB 2410471 A GB2410471 A GB 2410471A
Authority
GB
United Kingdom
Prior art keywords
carrier
hollow
space
inner bottom
carrier according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0401847A
Other versions
GB2410471B (en
GB0401847D0 (en
Inventor
Per Herbert Kristensen
Lars Sannes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Moss Maritime AS
Original Assignee
Moss Maritime AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Moss Maritime AS filed Critical Moss Maritime AS
Priority to GB0401847A priority Critical patent/GB2410471B/en
Publication of GB0401847D0 publication Critical patent/GB0401847D0/en
Priority to DE602005021457T priority patent/DE602005021457D1/en
Priority to PCT/NO2005/000026 priority patent/WO2005073069A1/en
Priority to KR1020067015521A priority patent/KR20060127958A/en
Priority to JP2006550983A priority patent/JP4774373B2/en
Priority to EP05710931A priority patent/EP1711395B1/en
Priority to CN2005800026208A priority patent/CN1910079B/en
Publication of GB2410471A publication Critical patent/GB2410471A/en
Priority to NO20063818A priority patent/NO20063818L/en
Application granted granted Critical
Publication of GB2410471B publication Critical patent/GB2410471B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00Hulls characterised by their structure or component parts
    • B63B3/14Hull parts
    • B63B3/62Double bottoms; Tank tops
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B2025/087Load-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)

Abstract

A carrier vessel 2 is arranged with at least one spherical cargo tank 6 for transporting LNG. The carrier has an outer bottom 4 and an inner bottom 3 defining a double bottom, while a number of hollows 5 are provided in the inner bottom and spaced in the longitudinal direction of the carrier. Each hollow is designed to accommodate a portion of each cargo tank. The distance from the inner bottom to the neutral axis (NA) of the carrier constitutes about 25% of the distance from the outer bottom to the main deck 23. The space 16, 17 and 18 between the inner and outer bottoms is a closed space and constitutes voids and ballast tanks.

Description

The invention concerns a LNG carrier in accordance with the preamble of
claim 1.
In the following the ship transporting liquefied natural gas (I,NG) is named a carrier or a LNG-carrier. As the skilled person will understand the expression carrier is to be understood equal to a vessel, a ship etc. The vessels tonnage is often used to characterize a ships size such as a LNG-carrier.
The calculation of a ships tonnage is based on the overall enclosed volumes of the ships hull and most of the utility compartments of the ship. The ships tonnage is made use of, when calculating fees and tolls in harbour and canal transits. Due to various regulations and practice throughout the world of shipping, the method for calculating the ships tonnage may vary from various authorities.
The individual method for calculation the ships tonnage may be crucial to the specific ship, for instance when deciding the fiscal duty to let the ship pass through a canal. This is particularly true for the ships to enter for instance the Suez canal, as IS the authorities of the Suez canal has established a distinctive method for calculating the ships tonnage. According to this method the calculated volume of the ship may be reduced if the ship is constructed with a double bottom. When applying this method, and include in the design of the ship a true double bottom, the characterizing tonnage of the ship which is defined by subtracting the volume of the double bottom from the gross volume of the ship, will be reduced The alternative for ships not entering the entrance of the Suez canal, are to make the long journey around Africa, and thereby adding time to total travelling time and increasing the operation costs of the ship.
These specific regulations of the Suez has initiated the construction of a new LNG carrier, which specifically is adapted to fulfil the requirements of the Suez regulations regarding the calculated tonnage of the ship. A further initiative has been to bring about a well defined double bottom which evidently will be accepted within the regulatory definition of a double bottom and which fulfils the safety aspects for double bottoms set by the authorities. However, the double bottom must be adapted to the carrier ensuring that the carriers load capacity is attended to.
The object of the invention is to provide a LNG-carrier where the need for a clearly defined double bottom contributing to reduction of the tonnage of the vessel is balanced against the need for a double bottom which gives the carrier an adequate strength and satisfactory support for the LNG cargo tanks.
Seen purely from a commercial or economical point of view it would be desirable to provide a LNG-carrier with a highest possible double bottom to reduce the fiscal duties through the canal. But this desire has to be balanced against the need for a hull construction which has an adequate subdivision, adequate strength and is
stable.
The object of the invention is obtained with a carrier according to claim 1, wherein these aforementioned needs are balanced.
In accordance with the invention a carrier is arranged with at least one cargo tank for transporting liquefied gas preferably liquefied natural gas (LNG). The carrier will preferably be provided with a number of cargo tanks which have a spherical shape or near spherical shape. The carrier is designed with an outer bottom and an inner bottom defining a double bottom. A number of hollows are provided in the inner bottom and spaced in the longitudinal direction of the carrier wherein each hollow is designed to accommodate a lower part of each cargo tank. The distance from the inner bottom to the neutral axis of the carrier constitutes about 25% of the distance from the outer bottom to the main deck (depth of the vessel). The distance from the inner bottom to the neutral axis can vary, and thereby also the percentage which may vary from 15-to 30%.
The carrier is preferably provided with side tanks for ballast, which side tanks are separated from the double bottom and supported on the top of the double bottom on each longitudinal side of the carrier. The space between the inner bottom and the outer bottom (the double bottom) is a closed one and preferably void or used for ballast. In one embodiment of the invention the longitudinal bulkheads divides the space of the double bottom in port space(s), center space(s) and starboard space(s).
The carrier will be provided with skirts for supporting the cargo tanks. The skirts are attached to the cargo tanks and to the inner bottom.
Each hollow is a structure arranged in the inner bottom in a way that ensures that the space between the inner and outer bottom is a closed one and each hollow deepens into the space of the double bottom.
The horizontal sections of each hollow may vary with the depth of the hollow. Even so, the surface of the inner bottom is larger than the combined surfaces of a horizontal section of the hollows at the inner bottom level. In a preferred embodiment of the hollow, the horizontal section of the hollow decreases towards the bottom of the hollow. The hollow may be shaped as halved spherical structures or half polygon structures, and the horizontal section of the hollow may be octagonal, polygonal, spherical etc. In the following one example of a preferred embodiment of the invention is to be described in detail with reference to attached drawings where Figure 1 is a perspective view of the new carriers double bottom.
Figure 2 is a view of the cross section of the new carrier in the middle of a hollow.
Figure 3 is a view of the cross section of a carrier in accordance with present design.
Figure 4 is a perspective view of a lower section of the carrier in accordance with present design The carrier shown in figures I and 2, is a new LNG-carrier 1 designed with a double bottom 27 which is constituted by a inner bottom 3 and a outer bottom 4. l he carriers main deck is shown by 23. The inner bottom 3 is provided with a number of hollows 5 corresponding to the number of cargo tanks 6 to be arranged on the LNG carrier 1. The LNG-carrier I is further provided with skirts 7 to support the cargo tanks.
The horizontal sections of the hollows 5 may vary with the depth of the hollows, both in regard to shape and size of the surface of the horizontal section. In figure 1 it is seen that the surface of the inner bottom 3 is larger than the combined surfaces of an horizontal section of each hollow 5. The horizontal section of the hollows 5 at the level of the inner bottom 3 is shown to be octagonal. Each hollow 5 is arranged in the inner bottom 3 to deepen into the space between the inner bottom 3 and the outer bottom 4. The hollows 5 are integrated in the inner bottom 3 in a way that ensures that the space between the inner and outer bottom is kept closed.
The hollows 5 may be designed as a part of the inner bottom 3 or may be made as an independent structure which is joined to inner bottom 3. The shape of each hollow 5 may vary as long as it is capable of accomodating a portion of the cargo tank 6. In figure 1 each hollow 5 comprises plural surfaces which slopes downwards towards the outer bottom 4 and towards the center of the hollow 5. The bottom of the hollow 5 is oriented horizontally in a parallel relationship to the inner bottom 3.
In the following the new inventive design of the LNG-carrier as shown in the figures I and 2 is to be explained and compared to a present design shown in the figures 3 and 4.
The present design LNG-carrier as displayed by the cross-section in figure 3 has an outer hull 9 and an inner hull 8. The inner hull 8 is shaped to accommodate a lower portion of the cargo tanks 22. The structures 8a is given a rectangular shape to form the cargo hold. The hull is divided into separated spaces or compartments by longitudinal bulkheads 10, 11 and transverse boxes 12, se figure 4. The spaces 13a, 13b are provided as side deep tanks for ballast water and the space 13c is a tunnel for pipes. Skirts 21 for supporting the cargo tanks are attached to a platform integrated with the side tanks.
In figure 2 the LNG-carrier in accordance with the invention is shown. The double bottom 2 is constituted by the inner bottom 3 and the outer bottom 4, and hollows 5 for accommodating a lower portion of the cargo tank 6 is arranged in the inner bottom 3. Each hollow 5 is constructed by inclining elements Sa and a horizontal clement 5b. The longitudinal bulkheads 14, 15 divide the space of the double bottom in a port space 16, a center space 17 and a starboard space l 8. Side tanks 19, for ballast water are arranged on the inner bottom 3 and skirts 7 for supporting the cargo tanks are attached to the inner bottom 3.
When comparing the configuration of the hull in figure 3 to the configuration of the hull of the inventive LNG-carrier in figure 2, it will be apparent to the skilled person that the LNG carrier in figure 3 is not constructed with a double bottom, whereas the inventive LNG- carrier in figure 2 has a clearly defined double bottom.
In figure 3 the tanks 13a, 13b for ballast water are so-called hopper tanks, and each tank fills both part of the spaces at the bottom and at the sides of the LNG-carrier.
Whereas in figure 2 the double bottom 2 is separated from the spaces 19, 20 at the sides of the LNG-carrier by the inner bottom 3. The spaces 19, 20 at the sides function as tanks for ballast water while the spaces 16, 17, 18 of the double bottom may be for ballast water or are void spaces.
In figure 3 the structure 8a of the top of the hopper tank is given a rectangular shape to form the cargo hold, as illustrated in figure 4. The inner bottom 3 of the new LNG carrier in figure 2 is provided with hollows to accommodate the cargo tanks 6, in such a way that the surface of the inner bottom 3 is larger than the combined surfaces of an horizontal section of each hollow. This proportion is not applicable to the top of the hopper tank, see figure 4, where a predominant portion is rectangular shaped to accommodate the lower portion of the cargo tanks 22. This construction is not applicable as a double bottom.
The neutral axis is illustrated in figures 2 and 3 by NA. To minimize the deflections in the lower part of the supporting skirt the inner bottom 3 should be positioned close to the neutral axis. When the distance from the inner bottom 3 to the neutral axis NA of the carrier constitutes about 25% of the distance from the outer bottom 4 to the main deck 23, the invention fulfils both aspects of the object of the invention; The carrier and the cargo tank support are given an adequate strength and the double bottom is clearly defined and fulfilling the regulatory definition of the double bottom and the set safety aspects. Further, it is clear that the volume of the double bottom is to be subtracted when calculating the tonnage of the carrier to enter for instance the Suez canal.

Claims (9)

1. A carrier arranged with at least one cargo tank preferably spherical or near spherical, for transporting liquefied gas preferably liquefied natural gas (LNG), wherein the carrier has an outer bottom and a inner bottom defining a double bottom and a number of hollows are provided in the inner bottom and spaced in the longitudinal direction of the carrier, wherein each hollow is designed to accommodate a portion of each cargo tank, and wherein the distance from the inner bottom to the neutral axis of the carrier constitutes about 25% (15-30%) of the distance from the outer bottom to the main deck.
2. A carrier according to claim 1, wherein the side tanks preferably for ballast are separated from the double bottom and supported on the top of the double bottom.
3. A carrier according to claim lor 2, wherein the skirts for supporting the cargo tanks are attached to the inner bottom of the double bottom.
4. A carrier according to one of the claims 1-3, wherein the space between the inner bottom and the outer bottom is a closed one and constitutes voids and ballast tanks.
5. A carrier according to one of the claims 1-4, wherein longitudinal bulkheads divides the space of the double bottom in port space(s), center space(s) and starboard space(s).
6. A carrier according to one of the claims 1-5, wherein each hollow is a structure arranged in the inner bottom in a way that ensures that the space between the inner and outer bottom is a closed one and each hollow deepens into the space of the double bottom.
7. A carrier according to one of the claims 1-6, wherein the horizontal sections of the hollows may vary with the depth of the hollows and the surface of the inner bottom is larger than the combined surfaces of an horizontal section of the hollows.
8. A carrier according to one of the claims 1-7, wherein the hollow is shaped as half spherical structures or half polygon structures, and the horizontal section of the hollow may be octagonal, polygonal, spheric.
9. A carrier according to one of the claims 1-8, wherein the horizontal section of the hollow decreases towards the bottom of the hollow.
A carrier substantially as hereinbefore described bv way of example with reference to and as shown in the accompanying drawings
GB0401847A 2004-01-28 2004-01-28 An LNG-carrier with spherical tanks and double bottom Expired - Fee Related GB2410471B (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB0401847A GB2410471B (en) 2004-01-28 2004-01-28 An LNG-carrier with spherical tanks and double bottom
JP2006550983A JP4774373B2 (en) 2004-01-28 2005-01-21 LNG carrier with spherical tank and double bottom
PCT/NO2005/000026 WO2005073069A1 (en) 2004-01-28 2005-01-21 A lng-carrier with spherical tanks and double bottom
KR1020067015521A KR20060127958A (en) 2004-01-28 2005-01-21 A lng-carrier with spherical tanks and double bottom
DE602005021457T DE602005021457D1 (en) 2004-01-28 2005-01-21 LIQUID GAS CARRIER WITH SPHERICAL TANKS AND DOUBLE FLOOR
EP05710931A EP1711395B1 (en) 2004-01-28 2005-01-21 A lng-carrier with spherical tanks and double bottom
CN2005800026208A CN1910079B (en) 2004-01-28 2005-01-21 A lng-carrier with spherical tanks and double bottom
NO20063818A NO20063818L (en) 2004-01-28 2006-08-28 LNG transport device with spherical tanks and double bottom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0401847A GB2410471B (en) 2004-01-28 2004-01-28 An LNG-carrier with spherical tanks and double bottom

Publications (3)

Publication Number Publication Date
GB0401847D0 GB0401847D0 (en) 2004-03-03
GB2410471A true GB2410471A (en) 2005-08-03
GB2410471B GB2410471B (en) 2007-04-11

Family

ID=31971597

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0401847A Expired - Fee Related GB2410471B (en) 2004-01-28 2004-01-28 An LNG-carrier with spherical tanks and double bottom

Country Status (7)

Country Link
EP (1) EP1711395B1 (en)
JP (1) JP4774373B2 (en)
KR (1) KR20060127958A (en)
CN (1) CN1910079B (en)
DE (1) DE602005021457D1 (en)
GB (1) GB2410471B (en)
WO (1) WO2005073069A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008104769A1 (en) * 2007-02-26 2008-09-04 Piesold, Alexander, James Support system
RU2446980C2 (en) * 2007-11-16 2012-04-10 Мицубиси Хеви Индастрис, Лтд. Liquefied gas carrier

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CN101665143A (en) * 2008-09-05 2010-03-10 吴植融 Multifunctional offshore bases and quality replacement method for ballast seawater and LNG or LPG and the like
WO2010150126A2 (en) * 2009-06-23 2010-12-29 Thanappuhettige Sunil Somasiri Gomes Technology of ecodesigned spherical for latex handling
JP2012056429A (en) * 2010-09-08 2012-03-22 Mitsubishi Heavy Ind Ltd Liquefied gas carrying vessel
CN102322264B (en) * 2011-05-26 2014-07-02 上海交通大学 Gas hydrate exploitation, well completion, collection and conveying platform system
JP2015217749A (en) * 2014-05-15 2015-12-07 川崎重工業株式会社 Ship body support structure of liquefied gas tank, and liquefied gas carrier
CN104787249B (en) * 2015-03-27 2017-04-26 浙江欣海船舶设计研究院有限公司 River-sea transportation double-fuel LNG tank car transport ship
CN105292384B (en) * 2015-11-13 2017-07-25 舟山长宏国际船舶修造有限公司 A kind of antifreeze liquefied natural gas LNG goods tank ship
KR102196987B1 (en) * 2016-12-29 2020-12-30 현대중공업 주식회사 Gas Fuelled Container Carrier
JP6554126B2 (en) * 2017-02-21 2019-07-31 株式会社新来島どっく Gas fuel independent tank installation structure of car carrier
CN107776827A (en) * 2017-10-18 2018-03-09 上海新奥新能源技术有限公司 A kind of load-carring transport

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US3968764A (en) * 1974-10-31 1976-07-13 Moss Rosenberg Verft A/S Ships for transport of liquefied gases
US4090460A (en) * 1975-10-20 1978-05-23 Hitachi Shipbuilding & Eng. Co., Ltd. Spherical tank supporting system for low temperature liquified gas storage tank carrying vessel
US4382524A (en) * 1976-10-21 1983-05-10 Moss Rosenberg Verft A/S Spherical tank supported by a vertical skirt

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008104769A1 (en) * 2007-02-26 2008-09-04 Piesold, Alexander, James Support system
RU2446980C2 (en) * 2007-11-16 2012-04-10 Мицубиси Хеви Индастрис, Лтд. Liquefied gas carrier

Also Published As

Publication number Publication date
WO2005073069A1 (en) 2005-08-11
EP1711395B1 (en) 2010-05-26
JP4774373B2 (en) 2011-09-14
GB2410471B (en) 2007-04-11
DE602005021457D1 (en) 2010-07-08
GB0401847D0 (en) 2004-03-03
CN1910079A (en) 2007-02-07
JP2007519572A (en) 2007-07-19
KR20060127958A (en) 2006-12-13
EP1711395A1 (en) 2006-10-18
CN1910079B (en) 2012-11-28

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130128