JPS59160691A - Installation method of tank in low temperature liquefied gas transportation vessel - Google Patents

Abstract

PURPOSE:To efficiently carry out the positioning of a tank onto a new hull by making the new hull with a mount fitted to the side wall of a hold half-submerged, and after the support frame on the side of the tank floating on the sea is engaged with the mount in the hold, making the new hull to be floated up. CONSTITUTION:A new hull 1 is built in such a condition that one side of a hold is open, there in no lateral bulkhead, and a mount 7 for an LNG storage tank 3 is provided to a side wall 3 of the hold, and such hull is half-submerged on the sea. The LNG storage tank 3 having a support frame around it which corresponds to the mount 7 in the side wall of the hold is floated on the sea. Then, the floating tank 3 is drawn into the hold with the tank support frame engaged with the mount 7, and the hull is raised to complete the transfer of the tank to the new hull. Because of the mount 7 and support frame, the transfer and positioning of the tank can be done easily and efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for mounting tanks on a low-temperature liquefied waste carrier.

In ships carrying low-temperature liquefied gas such as LPG, high-grade materials are used in storage tanks, and the hull itself reaches the end of its lifespan earlier than the tanks, but tanks that can still be used are scrapped together with the hull. is extremely uneconomical. Therefore, a method has already been proposed to transfer only the tanks from the old old hull to the new hull. This method involves pulling the bare tanks one by one into the hold from the front or rear end of the hull, and After that, the hull is floated and the tank is supported on the hold floor plate. According to this method, the bottom of the tank is directly supported on the hold floor plate, so
There was a problem in that positioning was extremely difficult.

Therefore, an object of the present invention is to provide a method for mounting tanks in a low-temperature liquefied gas carrier that can solve the above-mentioned problems.

That is, the present invention provides a ship hull constructed with one end of the hold open, without a transverse bulkhead in the hold, and with a cradle for a low-temperature liquefied gas storage tank provided on the side wall of the hold. The tank was launched into a semi-submersible state, and then a low-temperature liquefied gas storage tank with a support stand attached to its outer periphery at a position corresponding to the pedestal on the side wall of the hold was floated on the ocean, and the tank was placed in the hold. A method for mounting a tank on a low-temperature liquefied gas carrier, characterized in that the tank is pulled into the tank, and then the hull is floated to support the tank on a pedestal on a side wall of the hold via its support, and according to this method, After the tank is pulled into the hold, the support stand for the tank is placed on the cradle on the hull side, making it easy to move it into position.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 8. (1) is the hull of the low-temperature liquefied waste carrier (2).
The front end of the hold (3) is opened and the transverse bulkhead (4)
), and with pedestals (7) for low-temperature liquefied gas storage tanks (6) installed on both sides of the hold (3) (inner surface of the hull) (5). .

As shown in FIGS. 7 and 8, the pedestal (7) has a first horizontal plate (8) having a predetermined width and a bracket (9) that supports the first horizontal plate (8). 3 have been created.

In addition, a first buffer material αO is arranged near the inner end of the first horizontal plate (8) of this pedestal (7), and the first horizontal plate (8)
The area between the hold side wall (5) and the first buffer material αQ, and between the inner end of the first buffer material α0 and a position slightly lower than this inner end is the inner circumference heat insulator αD and the intermediate door heat insulator a. So covered. The low-temperature liquefied gas storage tank (hereinafter simply referred to as tank) (6) installed in the above-mentioned hold (3) is supported on the entire outer circumference of its vertically intermediate portion (the position corresponding to the pedestal (7)). A stand α port is attached. The support stand 03 is composed of a second horizontal plate 0→ having a predetermined width and a bracket (to) supporting the second horizontal plate α→. Further, a second cushioning material aG is arranged near the inner end of the second horizontal plate α→, and further, the outer periphery of the upper half of the second cushioning material αQ from the outer end is covered with an upper heat insulating material (17).

Next, a method for mounting the tank inside the hull will be explained.

First, the hull (1) is launched, and as shown in FIGS. 1 and 2, ballast water is injected and the hull is submerged in a semi-submerged state. Next, a predetermined number (four in this example) of tanks (2) are floated on the ocean and towed to a position corresponding to the open front end of the hull (1), and as shown in FIG. 6A) (6B) (6C) (6D) at a predetermined position in the hold (3), that is, the second buffer material α on the tank (6) side matches the first buffer material (11) on the hold (3) side. The tank (6) to be drawn in
Among them, a predetermined tank (6), that is, the third tank in the chain (6
A transverse bulkhead (4) is installed in advance at the front and rear ends of C) and at the rear end of the first tank (6A). In this way, if the horizontal corner W (4) is provided in the tank (6) first, the installation work will be easier than if the horizontal @ wall (4) is installed later in the narrow hold (3). . When all the tanks (6) are drawn into the designated positions in the hold (3), the ballast water is discharged and the hull (1) is floated, and the seawater in the hold (3) is discharged and the 1 and 2nd buffer material +
10 (1!) to support the side of the tank (6) on the pedestal (7) on the hull (1) side. Then, when the seawater is completely drained, the tank (6) is placed in the lower part of the hold (3), that is, on both sides. inside IX'j
The lower part of the tank (6) is heat-insulated by connecting the bottom plate of the heat insulating material (c). Finally, the top of the tank (6) is held on the hold top plate (3b) by the upper part (4).

According to the above method, after the tank is pulled into the bow, the support stand for the tank is placed on the cradle on the hull side.
Positioning becomes easy. In addition, since the upper part of the tank support and the vicinity of the pedestal in the hold are covered with heat insulating material in advance, heat insulation work only needs to be done at the bottom of the tank after the tank is installed.

It goes without saying that the above tank mounting method can be applied even when loading a new tank onto a new hull, or when loading an old tank onto a new hull. Furthermore,
In the above embodiment, the tank is drawn into the hold from the front end of the hull, but for example, the engine part at the rear of the hull may be removed and the tank may be drawn into the hold from the rear of the hull.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the hull of a low-temperature liquefied gas carrier, FIG. 2 is a plan view of the same, and FIG. Figure 4 is a view from the ■-■ arrow of Figure 1, Figure 5 is a diagram explaining the loading procedure, Figure 6 is a view from the ■-■ arrow of Figure 5, and Figure 7 is a view of the tank after it has been installed. FIG. 8 is an enlarged view of the ■ part in FIG. 7. (1)...hull, (2)...low temperature liquefied gas carrier, (
3)... Hold, (3a) Floor plate, (3b) Top plate, (4) Transverse bulkhead, (6) Low temperature liquefied gas storage tank, (7) Receiving tank. Base, Gυ-...first buffer material,
(11)... Inner peripheral heat insulating material, u4... Intermediate heat insulating material,
03・Support stand, (10・Second buffer material, αη・・Upper heat insulation material, (to)−・Lower heat insulation material agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. Launching a ship built with one end of the hold open, without a transverse bulkhead in the hold, and with a cradle for a low-temperature liquefied gas storage tank installed on the side wall of the hold. and submerged in a semi-submersible state, and then floating a low-temperature liquefied gas storage tank with a support stand attached to its outer periphery at a position corresponding to the cradle on the side wall of the hold on the ocean, and pulling the tank into the hold; A method for mounting a tank on a low-temperature liquefied sludge transport ship, characterized in that the hull is then floated and the tank is supported on a pedestal on a side wall of the hold via the support pedestal.