CN116812082A

CN116812082A - Ocean tanker liquid storage system

Info

Publication number: CN116812082A
Application number: CN202310247509.5A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Beijing Fengrunming Science And Trade Co ltd
Current assignee: Beijing Fengrunming Science And Trade Co ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-09-29

Abstract

A liquid storage system for an ocean going tanker is described that includes a tank having a converging top wall. The converging top wall of the tank receives a substantial amount of liquid therein and reduces the free surface area associated with the liquid. The converging top wall of the tank extends onto the horizontal deck of the vessel and allows sufficient deck space to support the various required equipment.

Description

Ocean tanker liquid storage system

Technical Field

The invention discloses a liquid storage system of an ocean-going tanker, which generally relates to the marine transportation of liquid fuel. In another aspect, the present invention relates to an ocean going vessel for transporting Liquefied Natural Gas (LNG) over long distances. .

Background

Vessels for transporting Liquefied Natural Gas (LNG) are one of the most expensive commercial cargo vessels in the world. This is mainly due to the relatively light weight of lng (for some cargo weights, a large volume is required) and the low temperatures required to keep lng in the liquid state at low pressure to achieve commercially acceptable long haul sea transport of lng. Typically, the transport pressure of LNG is at or slightly above atmospheric pressure and the temperature is about-160 ℃ (-260 ℃ F.). All lng storage systems (i.e., storage tanks) must be made of materials that are capable of withstanding low temperatures and large temperature changes from atmosphere to conditions of use. In addition, all tanks should provide effective insulation to prevent unacceptable cooling and heat from entering the bilge hull structure.

Disclosure of Invention

The present invention aims to provide a solid liquid storage system for an ocean going tanker that minimizes liquid expansion without the use of internal baffles.

Another object is to provide a solid liquid storage system for ocean going tankers that improves the stability of the vessel.

It is another object to provide a solid liquid storage system for an ocean going tanker that minimizes the free surface area of the liquid contained therein.

Another object is to provide a solid liquid storage system for an ocean going tanker that is capable of effectively using a defined volume inside the hull.

It is another object to provide a solid liquid storage system for an ocean going tanker that can be filled at various levels below the total capacity.

Another object is to provide a solid-liquid storage system for ocean going tankers which keeps the centre of gravity of the vessel as low as possible.

It is also desirable to provide a solid LNG storage tank that minimizes vaporization of LNG during transportation.

A first aspect of the invention relates to a vessel comprising an aspherical tank defining a total internal volume. The tank includes at least three upwardly converging walls defining at least about 10% of the total internal volume therebetween.

A second aspect of the invention relates to a vessel comprising a prismatic tank and a deck. The prismatic tank includes a pair of laterally spaced apart and upwardly converging sidewalls. When the vessel is erected, the deck has a substantially horizontal top surface. At least a portion of the tank extends above the top surface of the deck.

A third aspect of the invention relates to a tanker for transporting a liquid. The tanker comprises a tank defining an internal volume for receiving and holding liquid. The interior volume has the shape of a pair of side surfaces that are laterally spaced apart and converge upwardly. The sides have upper and lower edges, respectively. The interior volume also has an upper surface extending between upper edges of the converging sides. The upper and lower edges of the converging sides are vertically spaced from each other by a minimum vertical distance that is at least 20% of the maximum lateral distance between the lower edges of the converging sides.

Drawings

Fig. 1 is a side view of a tanker in accordance with the principles of the present invention, particularly illustrating the shape and orientation of a plurality of prismatic tanks housed and supported in the hull.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, a tanker 10 including a hull 12, a structural deck 14, and a plurality of tanks 16. The tanker 10 may be any type of ocean going tanker designed for transporting liquid cargo over long distances. Preferably, the liquefied gas above the tanker 10 is configured to transport Liquefied Natural Gas (LNG), for example, at low temperatures and at atmospheric pressure of about-160 ℃ (e.g., about-260°f). The tank 16 is received and supported by the hull 12. Deck 14 extends across the top of hull 12 and has a substantially flat, substantially horizontal, and exposed top surface 18. A portion of the tank 16 preferably extends above the upper deck surface 18. Tanker 10 can also include an anchor device supported on upper surface 18 of deck 14. The anchoring equipment typically includes an anchoring winch 20, an anchoring rope and a drill bit. The anchoring winch 20 is preferably spaced from the sides of the tanker 10 to provide longer anchoring lines. The anchor rows are resilient and allow some movement between the tanker 10 and the dock (not shown) so that the longer the anchor rows anchor the tanker 10, the safer. The short berth forms a tighter connection between the quay and the tanker 10. Such a rigid connection may damage the tanker 10 or the quay if external forces (e.g., wind and waves) cause relative movement between the tanker 10 and the quay. Accordingly, the anchoring winch 20 is preferably located at a generally longitudinal centerline of the vessel 10, with the drill bit 24 being adjacent to a side of the vessel 10. Preferably, at least one mooring winch 20 is located on a generally horizontal upper surface 18 of deck 14, between the portions of adjacent tanks 16 that extend above upper deck surface 16. Also behind tank 16 is a rear roof structure 26 extending upwardly from deck 14.

Claims

1. A liquid storage system for an ocean going tanker, comprising: a deck comprising an aspherical tank having a flat horizontal top surface, the tank having at least three upwardly converging walls and a fourth vertical wall, the at least three upwardly converging walls comprising a pair of side walls facing each other, laterally spaced apart and converging, each side wall extending upwardly at an angle from horizontal to 30 degrees to 60 degrees; the upper surface of the deck forms a horizontal plane intersecting the converging wall of the tank at its lower edge, the tank including a pair of bottom side walls in full contact with the hull and supported laterally by the hull, and a vertical fourth wall extending vertically above the deck.

2. The ocean going tanker liquid storage system of claim 1 wherein the at least three upwardly converging walls comprise an upwardly converging third wall.

3. The ocean going tanker liquid storage system of claim 1, wherein the converging wall and the vertical wall form an upper portion of the total internal volume therein, the upper portion having a volume of at least 15% of the total internal volume; at all positions perpendicular to the direction of extension of the ship, the top surface is at least 25% of the maximum width of the ship, and the cross section of said top surface may extend through the tank.

4. A liquid storage system for an ocean going tanker according to claim 1, wherein the top edges are in the same plane and the lower edges of the tanks are in the same plane; the upper edges of two of the converging walls extend parallel to each other and the lower edges of the converging walls extend parallel to each other; each of the upwardly converging side walls and the upwardly converging third wall form wall planes, each wall plane formed by the upwardly converging side walls forming two dihedral angles intersecting the wall plane formed by the upwardly extending third wall.

5. A liquid storage system for an ocean going tanker according to claim 1, the storage tank being a prismatic membrane tank; a tank for liquid transport comprising a pair of laterally spaced and upwardly converging side walls, a third wall converging upwardly with the upwardly converging side walls; the fourth wall is vertical and the deck has a flat horizontal top surface, and each of the pair of laterally spaced and upwardly converging side walls and the upwardly converging third wall includes a lower edge, the upper surface of the deck forming a horizontal plane intersecting the converging walls of the tank at the lower edge of the converging walls.

6. The ocean going tanker's liquid storage system of claim 1, wherein the upper and lower edges of the upwardly converging side walls are vertically spaced apart from each other by a minimum vertical distance in the range of 30% to 70% of the maximum lateral distance between the lower edges, the upper edges of the upwardly converging side walls and the lower edges of the upwardly converging third walls are coplanar, and the upper edges of the upwardly converging side walls and the upper edges of the upwardly converging third walls are coplanar.