KR101751842B1

KR101751842B1 - Method for building lng carrier using pre-constructing cargo containment system and lng carrier thereby

Info

Publication number: KR101751842B1
Application number: KR1020150122819A
Authority: KR
Inventors: 손정군
Original assignee: 대우조선해양 주식회사
Priority date: 2015-08-31
Filing date: 2015-08-31
Publication date: 2017-06-28
Also published as: KR20170025820A

Abstract

The present invention relates to a drying method of a liquefied gas carrier using a pre-holding of a cargo hold construction and a liquefied gas carrier manufactured by the drying method of the liquefied gas carrier, wherein in a pre-erection area (PE) By constructing a cargo hold consisting of tanks, all of the cofferdams of each cargo tank are constructed with a closed structure, and the construction work on the land is completed, so the construction period on the wall is greatly shortened, and work efficiency is improved and drying cost is reduced And it is possible to prevent the outer surface of the ship from being seriously contaminated by exposing the seawater for a long time, thereby omitting the step of cleaning by reintroducing the completed ship into the dock, The maintenance and management costs required to maintain the state of maintenance can be reduced, It is possible to increase the rotation rate of the dock, to improve the production and operation efficiency, and to lower the production cost by enlarging the proportion of work on the land which is less constrained by the working environment.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a liquefied gas carrier, and more particularly, to a method for drying a liquefied gas carrier using a pre-

The present invention relates to a method for drying a liquefied gas carrier using pre-processing of a cargo hold and a liquefied gas carrier manufactured by the method for drying the liquefied gas carrier, and more particularly, to a liquefied gas carrier having a pre-erection area (PE) The construction of the cargo hold consisting of a plurality of cargo tanks is completed, and all of the cofferdams of the cargo tanks are constructed in an airtight structure to complete the cargo hold construction on the land, thereby greatly shortening the construction period at the cargo wall, And a liquefied gas carrier line manufactured by the drying method of the liquefied gas carrier line.

Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane, and the like, and has recently been regarded as a low-pollution energy source in various technical fields. In particular, LNG is relatively inexpensive and less polluting, making it suitable for generating fuel.

In recent years, development of various marine resources has become active due to the depletion of landfilled energy, and the acquisition and development of oil wells and gas wells for the extraction of crude oil and natural gas from the sea have been taking place in various countries.

Natural gas may be transported in a gaseous state and may be transported to a remote location by a Liquefied Natural Gas Carrier (LNGC) in the form of liquefied natural gas (LNG).

Liquefied natural gas is obtained by cooling natural gas at a cryogenic temperature of approximately -163 ° C or below. Its volume is reduced to approximately 1/600 of that of natural gas, which makes it very suitable for long distance transportation through the sea.

Since the liquefaction temperature of natural gas is a cryogenic temperature of about -163 ° C at normal pressure, LNG is evaporated even if its temperature is slightly higher than -163 ° C at normal pressure. While LNG is stored in the LNGC's cargo hold and external heat is continuously transferred to the LNG, LNG is continuously vaporized in the cargo hold and boil-off gas is generated in the cargo hold.

Therefore, the cargo holds of liquefied natural gas carrier (LNGC) must be dried to ensure that natural gas cooled and liquefied at a temperature of -162 ° C can be stored stably while the hull has unstable motion, such as being shaken or impacted by waves do.

The liquefied natural gas carrier can be divided into a moss type in which four or five cargo tanks are independently provided, and a membrane type in which the cargo tanks are integrally installed.

Membrane type is made of 36% nickel steel (invar), NO 96 type with the same degree of liquid tightness and strength as the primary and secondary insulation barrier, and stainless steel with 1.2 mm thick corrugated primary insulation barrier There is Mark III type using steel, and although it has an integral shape, it generally has a structure in which the cargo holds are divided into four zones.

Conventional liquefied natural gas carriers are manufactured by assembling small and medium sized blocks and assembling them into a large block of 500 tons or less that can move to a location adjacent to a dock and moving to a land crane, (PE, pre-erection) is carried out on the land.

The large block or super large block completed on the land is moved to the dock and placed on the bottom of the bottom or mounted on the barge and the blocks transferred to the inside of the dock are combined to complete the cargo hold. Complete the hull. Then, air test and hydro test are carried out, and the hull is transferred to the seawall to perform the warming work of the cargo hold and the mounting and installation work of the chair with the seawall on the seawall.

1 is a side view showing a cargo hold of a conventional liquefied natural gas carrier.

Referring to FIG. 1, a cargo hold (cargo hold) 1 is manufactured by connecting the cargo tanks 10-40 in the dock after manufacturing the angle of each of the four cargo tanks 10-40 on the land . That is, after the first cargo tank to the fourth cargo tank 10-40 are respectively manufactured, the cargo hold (cargo hold) 1 is manufactured by welding at the dock. The first to fifth cofferdam 11-51 are formed in the first to fourth cargo tanks 10-40.

After cargo hold (cargo hold) (1) is moved to the seaport, carry out cargo hold construction and design work on the seaport.

However, the conventional liquefied natural gas carrier can not perform the cargo hold construction on the ground because it can not be carried out on the ground. The reason why the cargo hold construction can not be performed on the ground is that the fifth copper dam 51 of the fourth cargo tank 40 is opened , Because the stern bulkhead (bulkhead) is structurally included in the engine room block of the stern block.

Therefore, it is necessary to perform the cargo hold construction on the quay without being able to perform on the land. Therefore, the construction period at the quay wall takes about 9 months, so that the turnover rate of the dock is lowered and the mooring It is necessary to clean the outer wall of the ship such as removing the moss and contaminants by transferring the ship back to the dock.

Korean Patent Publication No. 10-2014-0048717

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cargo hold structure in which a cargo hold composed of a plurality of cargo tanks is dried in a pre-erection area (PE) The drying method of the liquefied gas carrier using the advancement of the cargo hold construction which can improve the working efficiency and reduce the drying cost by drastically shortening the construction period at the seashore by completing the cargo hold construction all over the land and the drying method of the liquefied gas carrier And to provide a liquefied gas carrier manufactured by the method.

In order to achieve the above-mentioned object, the present invention provides a liquefied gas carrier line drying method using the cargo window pre-operation and a liquefied gas carrier line manufactured by the drying method of the liquefied gas carrier line.

The drying method of the liquefied gas carrier using the pre-cargo hold construction according to the present invention is characterized in that a cargo hold composed of a plurality of cargo tanks is dried in a pre-erection area (PE), and the coffer dam of each cargo tank is sealed And constructing the cargo hold construction to complete the cargo hold construction; Depositing the cargo hold on a floating barge and flooding it to the sea; Drying the vessel by mounting the cargo hold, the fore block and the stern block after the cargo hold is docked in the dock; Launching the ship; And a step of mooring the ship which has been launched on the quay wall and performing the installation work of the equipment.

In the completion of the cargo hold construction, the cargo hold comprises a first cargo tank to a fourth cargo tank, and first to fifth copper dams to fifth copper dams, wherein the first to fifth copper dams are all sealed .

The first coffer dam is formed independently from the partition (bulkhead) of the bow block, and the fifth coffer dam is divided into a bulkhead (bulkhead) of an engine room formed in the stern block, Independently.

Perform an air test and a hydro test on the cargo tank to inspect and verify that the dimensions of the cargo hold are within the tolerated tolerances.

As described above, according to the present invention, in the preceding loading area, a cargo hold composed of a plurality of cargo tanks is dried, and all of the cofferdams of the cargo tanks are constructed in a sealed structure, The construction period can be drastically shortened, so that the work efficiency can be improved and the drying cost can be reduced.

Also, since the seawater is exposed for a long time, it is possible to prevent the outer surface of the ship from being seriously contaminated, thereby omitting the cleaning process by reintroducing the finished ship into the dock.

In addition, there is an effect that the cost of maintenance and management, which is required to maintain a state in which the ship is stably fixed for a long period of time, can be reduced and the production cost can be lowered.

In addition, by increasing the proportion of work on the land, which is relatively less restricted by the work environment than the dock or the wall, it is possible to increase the turnover rate of the dock, improve the production and operation efficiency, and reduce the production cost.

It is also possible to improve the turnover rate of the dock by eliminating the need for the coupling of the block and the cargo hold, the watertightness test, and the confirmation of the cargo hold dimension in the dock, thereby positively influencing the adjustment of the construction period of waiting vessels for the use of the dock, It is possible to further improve the space and time utilization of the display device.

1 is a side view showing a cargo hold of a conventional liquefied natural gas carrier
FIG. 2 is a block diagram illustrating a method of drying a liquefied gas carrier using a pre-hold operation according to a preferred embodiment of the present invention
3 is a side view showing a cargo hold according to a preferred embodiment of the present invention.
FIG. 4 is a perspective view showing a liquefied gas carrier line using a cargo window pre-work according to a preferred embodiment of the present invention.
5 is a view for explaining completion of construction of a cargo hold on the land;
Fig. 6 is a view showing the cargo hold being floated on the sea after first arriving on the launch barge

Hereinafter, a method of drying a liquefied gas carrier using a pre-hold operation according to a preferred embodiment of the present invention and a liquefied gas carrier manufactured by the method of drying the liquefied gas carrier will be described in detail with reference to the accompanying drawings.

3 is a side view showing a cargo hold according to a preferred embodiment of the present invention, and FIG. 4 is a side view showing the cargo hold according to the preferred embodiment of the present invention. Is a perspective view showing a liquefied gas carrier using a cargo window pre-work according to a preferred embodiment of the present invention, and Fig. 5 is a view for explaining completion of a cargo hold construction on the land. And Fig. 6 is a view showing a cargo hold being loaded on the main barge and floated to the sea.

As shown in the above drawings, the drying method of the liquefied gas carrier using the pre-cargo hold construction according to the present invention is characterized in that in the pre-erection area (PE), a plurality of cargo tanks 110-140 (S 10) of drying the cargo hold (cargo hold) 100 by forming the cofferdam (s) 111 - 151 of each cargo tank (110 - 140) in a sealed structure to complete the cargo hold construction onshore; (S 20) loading the cargo hold (100) to the sea after first loading the cargo hold (100) on the nose barge; A step S30 of docking the cargo hold 100 in the dock and then drying the ship by mounting the cargo hold 100, the bow block 200 and the stern block 300; Launching the ship (S40); (Step S50) of mooring the ship on the quay wall and installing the remaining equipment.

More specifically, in the step of drying the cargo hold (cargo hold) 100 (S 10), it is possible to combine the small and middle blocks together into a large block of a weight that can be transferred to the crane, The ship's hull is to be combined with the cargo hold, and a chief is installed inside the manufactured cargo hull for installation of equipment and heat insulation equipment, and a chair is installed inside the cargo hull.

The cargo hold 100 is composed of the first cargo tank to the fourth cargo tank 110-140 and the first to fifth cofferdames 111 to 151 in the completion of the cargo hold construction , And the first to fifth copper dam (111-151) are all formed in a closed structure.

The first cofferdam 111 is formed independently from the partition wall (bulkhead) of the bow block 200 and the fifth coffer dam 151 is formed in the engine compartment of the stern block 300 ).

Upon completion of the cargo hold, carry out air test and hydro test on each cargo tank (110-140) on the shore to inspect and confirm that the size of the cargo hold is within the allowable tolerance.

After the cargo hold 100 is first loaded on the main barge and the cargo hold 100 is lifted to the sea (S 20), the cargo hold 100 is first laid on the main barge using a modular transporter (not shown) (See FIG. 6).

The cargo hold 100 is docked in the dock and then the cargo hold 100 and the bow block 200 and the stern block 300 are mounted to dry the ship S30, A ship block 200 already manufactured on the land is mounted and a stern block 300 already manufactured on the land is mounted on the stern side of the cargo hold 100 to dry the ship.

Then, the hull completed in the dock is launched, moved to the seawall, and mounted on the seawall, with the extra seats installed and assembled to complete the ship construction.

As described above, in the drying method of the liquefied gas carrier using the cargo hold construction precedent, the cargo hold 100 composed of the first to fourth cargo tanks 110 to 140 is dried in each of the cargo tanks 110-140 The first to fourth cofferdam 111-141 and the fifth cofferdam 151 of the fifth cofferdam 151 as well as the fifth cofferdam 151 are constructed in a closed structure to perform the cargo hold construction such as the manufacture of the cargo hold, It is possible to greatly reduce the construction period at the quay wall, thereby improving the work efficiency and reducing the drying cost.

In addition, it is possible to prevent the outer surface of the ship from being seriously contaminated due to long-time exposure to the seawater, thereby omitting the cleaning process by reintroducing the completed ship into the dock.

100: Cargo hold
110: 1st cargo tank
120: Second cargo tank
130: Third cargo tank
140: Fourth cargo tank
111: First copper dam
121: Second copper dam
131: Third copper dam
141: Fourth copper dam
151: the fifth copper dam
200: player block
300: stern block

Claims

Drying a cargo hold made up of a plurality of cargo tanks in a pre-erection area (PE), wherein the cofferdam of each cargo tank is formed in a closed structure to complete the cargo hold construction; Depositing the cargo hold on a floating barge and flooding it to the sea; Drying the vessel by mounting the cargo hold, the fore block and the stern block after the cargo hold is docked in the dock; And launching the vessel,
Wherein the cargo hold comprises a first cargo tank to a fourth cargo tank and a first copper dam to a fifth copper dam, wherein the first copper dam to the fifth copper dam are formed in a closed structure And the fifth coffer dam is formed independently from a partition wall of an engine room formed in the stern block, wherein the fifth coffer dam is formed independently of the partition wall of the engine room formed in the stern block.

The method according to claim 1,
The method comprising the steps of: mooring the ship to the quay wall and installing the remaining equipment; and drying the liquefied gas carrier using the cargo hold construction advancement.

delete

The method according to claim 1,
Wherein the first cofferdam is formed independently from the partition of the bow block in the completion of the cargo hold construction.

The method according to claim 1,
A method of drying a liquefied gas carrier using pre-hold cargo work, comprising performing an air test and a hydro test on the cargo tank at the completion of the cargo hold construction.

A liquefied gas carrier produced by the method for drying a liquefied gas carrier as claimed in any one of claims 1, 2, 5 and 6.