KR20070008802A - Liquefied natural gas carrier with mooring arrangement in the upper deck - Google Patents

Abstract

An LNGC(Liquefied Natural Gas Carrier) having a mooring gear on an upper deck is provided to moor not only on the existing terminal but also with an FSRU(Floating Storage and Regasification Unit). An LNGC(100) having a mooring gear on an upper deck(112) comprises a slant(110) vertically cut on both sides of the upper end of a cargo tank(102) from the existing lateral side of the upper deck to have a horizontal unit broader than the existing upper deck; plural mooring winches(114) arranged on the horizontal unit of the broadened upper deck from a bow to a stern at regular intervals; and a mooring line formed on the upper deck to connect the LNGC with an FSRU side by side.

Description

Liquefied Natural Gas Carrier with mooring arrangement in the upper deck}

1 is a conceptual diagram showing the basic concept of the mooring method of the conventional liquefied natural gas carrier.

Figure 2 is a cross-sectional view showing an embodiment of a liquefied natural gas carrier having a mooring device on the upper deck according to the present invention.

3 is a cross-sectional view showing a central portion of a conventional liquefied natural gas carrier.

4 is a cross-sectional view showing a central portion of the embodiment shown in FIG.

<Explanation of symbols for the main parts of the drawings>

10: Spring Line 20: Breast Line

30: Head Line 40: Stern Line

100: liquefied natural gas carrier 102: Cargo Tank

106: mooring line 110: slant

111: trunk deck 112: upper deck

114: mooring winch 150: floating liquefied gas reservoir

152: hook

The present invention relates to a Liquefied Natural Gas Carrier (LNGC) having a mooring device on an Upper Deck, and more particularly, to a floating liquefied gas storage ship having mooring winches disposed on an upper deck. It relates to a liquefied natural gas carrier that can be moored alongside a Floating Storage and Regasification Unit (FSRU).

Natural gas is typically transported by pipeline from the area where it is produced to the area where it is consumed. However, in countries where production exceeds demand, large amounts of natural gas will remain and energy imbalances will increase unless there is an efficient way to transport natural gas to areas where demand exceeds demand.

Liquefaction of natural gas has facilitated the storage and transportation of natural gas.

Liquefied natural gas (LNG) is about 1/600 million of the volume occupied by the same amount of natural gas in the gas state, and liquefied natural gas is produced by cooling natural gas below its boiling point (-259 ° F. at ambient pressure).

For this reason, liquefied natural gas is stored in a cryogenic container at atmospheric pressure or slightly higher pressure, and the stored liquefied natural gas can be converted to a gas form by raising the temperature, which is called a regasification process. do.

In recent years, the demand for natural gas has increased, and liquefied natural gas carriers are introduced, in which special tanks are introduced in proportion to the demand.

 Natural gas produced in distant regions, such as Algeria, Borneo, Indonesia, etc., can be liquefied and shipped in the same way as above in Europe, Japan, or the United States. Collected into a liquefaction facility equipped with a bed.

Thereafter, the natural gas is pumped through a short pipeline and loaded into a tank installed in the cryogenic chamber.

After the liquefied natural gas carrier arrives at the destination port, the liquefied natural gas can be unloaded by a cryogenic pump to a land-based regasification facility where it can be stored liquefied or regasified.

To liquefy liquefied natural gas, the temperature rises until it exceeds the liquefied natural gas boiling point, and the liquefied natural gas returns to the gas state. The resulting natural gas can then be distributed through the pipeline system to the various areas where it is consumed.

However, since the 911 terrorist attacks in the United States in 2001, there has been an increasing demand for safety of dangerous goods, and if possible, there is a tendency to place dangerous facilities on the sea rather than on land. Fire facilities were also proposed to be at sea.

The regasification plant can be built on a fixed platform located at sea, or on a floating liquefied gas reservoir mooring offshore. Liquefied natural gas carriers can be docked or mooring in close proximity to the offshore regasification platform or ship so that liquefied natural gas can be unloaded by conventional means for storage or regasification. After regasification, natural gas can be transferred to onshore pipeline distribution systems.

1 is a conceptual diagram showing the basic concept of the mooring method of the liquefied natural gas carrier.

As shown in FIG. 1, the mooring line in the case of a general liquefied natural gas carrier can be largely divided into three categories.

Spring Line (10), Brest Line (Breast Line) 20, Head & Stern Line (Head & Stern Line) (30, 40) is divided into a double spring line 10 is a liquefied natural gas carrier Support the longitudinal force of 100.

In addition, the brest line 20 supports the transverse force of the liquefied natural gas carrier 100, and is located at the bow and stern in a direction perpendicular to the ship shaft, the headline 30 at the bow, the stun line 40 The stern serves to help the spring line 10 and the breast line 20, respectively.

However, although the mooring on a conventional terminal may be possible with such a general liquefied natural gas carrier, it is difficult to moor with a floating liquefied gas storage ship.

Therefore, there is a need for the development of a liquefied natural gas carrier that can not only moor on a general terminal but also with a floating liquefied gas storage ship.

The present invention has been made to overcome the disadvantages of the prior art as described above, to provide a liquefied natural gas carrier (LNGC) that can enable not only mooring on the existing terminal, but also mooring with the floating liquefied gas storage line (FSRU). To be a technical challenge.

In order to achieve the above technical problem, in order to moor side the liquefied natural gas carrier (LNGC) and the floating liquefied gas storage ship (FSRU) of the present invention, the mooring to the Upper Deck of the liquefied natural gas carrier Provided is a liquefied natural gas carrier having a mooring arrangement on an upper deck characterized in that the winches are arranged.

However, in the case of general liquefied natural gas carriers, most of the upper deck is an inclined portion, and the flat portion is narrowly formed on both sides of the ship, so the space for the mooring winches is limited. For this reason, the inconvenience of operation of the mooring winch, the lack of securing passage and the maintenance of the mooring winch are difficult.

Thus, a horizontal portion is further formed on the upper deck, and mooring winches are preferably mounted on the horizontal portion.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing an embodiment of a liquefied natural gas carrier having a mooring device on the upper deck according to the present invention.

As illustrated in FIG. 2, the liquefied natural gas storage line 100 is moored with the floating liquefied gas storage line 150 in a side by side manner.

As shown in FIG. 1, the mooring method of the general liquefied natural gas storage ship is connected to the head line 30 at the bow and the stern line 40 at the stern, and the breast line 20 is perpendicular to the ship shaft toward the center of the ship. In the middle, the spring line 10 is connected to the hook of the breast dolphin installed in the center position of the ship on the terminal.

However, in the case of FIG. 2, since the liquefied natural gas storage line 100 is moored alongside the floating liquefied gas storage line 150 at sea, a general mooring method cannot be used.

In other words, the head line and the stun line may be made similar to the mooring method on the existing terminal, but the breast line and the spring line should be different from the mooring method on the existing terminal.

As shown in FIG. 2, the floating natural gas storage ship 150 is positioned at one side of the liquefied natural gas carrier 100 at regular intervals, and the upper deck 112 of the liquefied natural gas carrier 100 is located. The mooring winch 114 is arranged in a row.

The mooring line 106 emerges from the mooring winch 114 arranged in a row and passes through a spaced space between two vessels, facing the side of the liquefied natural gas carrier 100. It is connected to the hook 152 mounted on one side of the gas storage line 150.

The mooring lines 106 are densely packed because of the narrow spacing between the two vessels, which can be seen as the characteristics of the spring line and the breast line, through which the two vessels are gradually narrowed and moored.

As described above, the hull capable of arranging the mooring winch 114 at a necessary point in the middle of the upper deck 112 in order to load and unload cargo by entering both the floating natural gas storage vessel 150 and the existing terminal. Rescue is required.

3 is a cross-sectional view showing a central portion of a conventional liquefied natural gas carrier.

Most membrane type liquefied natural gas carriers currently in use have a trapezoidal cross section at the top as shown in FIG. 3. That is, the upper portion of the hull is composed of the upper deck 112 and the trapezoidal upper horizontal deck deck 111 of both sides of the hull, the slanted slant (between the upper deck 112 and the trunk deck 111) 110, Slant).

In this case, when the mooring winch is mounted on the upper decks 112 existing on both side edges of the ship, the horizontal portion of the mooring winch is narrow due to the slant 110, making it difficult to secure the operation of the mooring winch or to secure a passage. Followed. Accordingly, the shape of the upper deck 112 is additionally changed for smooth side by side mooring with the floating natural gas storage ship.

4 is a cross-sectional view showing a central portion of the embodiment shown in FIG. Compared to FIG. 3, the slant 110 portions of the upper sides of the cargo tank 102 are cut at right angles to the side of the upper deck 112, so that the upper deck 112 has a wider horizontal angle than the conventional one. An addition is formed.

That is, by cutting the slant 110 is inclined long in the side of the existing upper deck 112 to have a wider upper deck 112, thereby the upper deck 112 is wider for several mooring The winch 114 may be arranged at predetermined intervals from the bow to the stern.

As described above, the liquefied natural gas carrier ship 100 and the floating natural gas storage ship 150 may be side by side mooring through the mooring line 106 on the upper deck 112. .

The rail system of the automatic welding device for pipes according to the present invention has been described above. Such a technical configuration of the present invention will be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be construed as being included in the scope of the present invention.

As described above, in the liquefied natural gas carrier (LNGC) of the present invention, although the horizontal part of the upper deck of the liquefied natural gas carrier is narrow in the past, the mooring winch cannot be mounted, but the upper portion of the liquefied natural gas carrier is cut off and The mooring winch can be arranged at regular intervals in the stern direction from the bow by expanding the horizontal part of the deck, allowing the floating liquefied gas storage ship (FSRU) and side by side mooring. It has the effect of making it work.

Claims (2)

In order to moor the liquid natural gas carrier (LNGC) and the floating liquid gas storage vessel (FSRU) side by side, Liquefied natural gas carrier having a mooring device on the upper deck, characterized in that the mooring winch is arranged along the cargo deck from the bow to the stern of the liquefied natural gas carrier. The method of claim 1, A liquefied natural gas carrier having a mooring device on the upper deck, wherein a horizontal portion is further formed on the upper deck, and mooring winches are mounted on the horizontal portion.

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