JPS59179479A - Tank loading method for low-temperature liquefied gas carrier ship - Google Patents

Abstract

PURPOSE:To have safe and easy transfer of tanks by floating a hull constructed as opened at one end of the hold having a tank receptacle table, at sea and also floating a tank provided with upper heat insulation and a supporting table on the water, and then sinking the hull in submerged state, and by towing the tank in the hold. CONSTITUTION:The hull of this low-temp. liquefied gas carrier ship is constructed in the state that one of the ends of its hold 3 is opened and that its bilge hopper part is equipped with a receptacle table 7 for an LNG storing tank 6, and the hull is launched on the water. The LNG tank 6 is put afloat at sea, wherein a supporting table 13 is installed at the periphery of the hold 3 at its part mating with said receptacle 7 of bilge hopper 5. The constructed hull is sunk in submerged state, and the tank 6 is towed in the hold 3, whereafter the hull is set afloat and the tank is supported through the receptacle 13 and supporting table 13. This will assure safe and easy transfer and location of the tank.

Description

[Detailed Description of the Invention] The invention is directed to a tank mounting method i on a low temperature liquefied gas carrier.
Regarding c.

High-grade materials are used for the storage tanks of LPG-', ;j-, low-grade γ night gas carriers. Also, when comparing the survival of the tank and the hull, the hull itself has a shorter lifespan.

Therefore, it is very uneconomical to scrap the tanks that can still be used together with the hull. Therefore, a method has already been proposed to transfer only the tanks from the old hull to a new hull. In this method, bare tanks are pulled into the hold one by one from the front or rear end of the ship's hull, and then the ship is raised to the surface and the tanks are supported above the hold floorboard.

However, according to this method, since the bottom of the tank is directly supported on the floorboard of the hold, it is extremely difficult to position the tank and there is a problem with null fitting.

The present invention provides a method for mounting tanks in a low t7flt liquefaction power carrier ship that can solve the above problems. The purpose is to provide.

The second method for installing tanks in a low iM liquefied gas carrier of the present invention is such that one end of the hold is open and there is no transverse bulkhead in the hold, and a part of the bilge hopper of the hold is provided with a tank for low-temperature liquefied gas storage. The hull built with the platform installed was launched and submerged in a semi-submersible state, and an external station VC support platform was installed in the first part of the bilge hopper in the hold, corresponding to the F<HE cradle. Float the low-temperature liquefied gas storage tank on the ocean and pull the tank into the hold, then float the hull and connect the tank via its support to the cradle VC of a part of the bilge hopper in the hold. According to method 6C, after the tank f is pulled into the hold, the support stand on the tank side of the hull 11111 [7] is mounted on the support stand f ink m, which facilitates positioning. It is.

Hereinafter, a specific embodiment of the dunk mounting method of the present invention will be described with reference to FIGS. 1 to 8. (1) is the hull of a low-temperature liquefied gas carrier (2).The front end of the hold (3) is open, the transverse bulkhead (4) is flattened, and part of the bilge hopper of the hold (3) is open. 5) The VC is constructed with a pedestal (7) for the low-temperature liquefied gas storage tank (6). It is made up of a first horizontal plate (8) having two parts, and a bracket (9) that fully supports this first horizontal plate (8). ) near the inner edge, the first slow profit oO is fixed by 1,
Furthermore, 17th, the 64110 part between the bilge hopper part (5) of the flat plate material (8) and the first cushioning material +10, and the inner end of the first offender QI value material u+J and a position slightly below this inner end is inside. The peripheral part is covered with a heat insulating material TIN and the middle part is covered with a heat insulating material TIN. The low-temperature liquefied gas storage tank (hereinafter simply referred to as tank) (6) mounted in the cargo hold (3) is equipped with a support stand on its outer periphery [at a position corresponding to the pedestal (7)]. is installed. The support stand IJ3 is made up of a second horizontal plate d4 having a predetermined width t, and a bracket 4 that supports this second horizontal plate α41. This s again! 2. A second Kuramae material rle is placed near the inner end of the horizontal board I,
The outer periphery of the upper half of the second buffer material rm from its outer end is covered by the upper heat insulating material a7)vc.

Next, we will explain how to install the tank inside the hull.

First, the above-mentioned hull (1) is launched, and as shown in Figures 1 and 2, the hull (balance) (Water? Inject and semi-submerged state (C submerged.Next C-1 number of V (4 in the tree example)
dunk) 2) Float on the entire ocean and the hull (Rinot3)
Tow it to a point d corresponding to the open part at the tJ end.

As shown in Figure 5, these tanks (6A) (6B
) (6C) (6D) at a predetermined position in the hold (3), i.e., the S2 relaxation material Oe on the tank (6) side is placed in the first position in the hold (3)
Sequentially pull in positions 1c that match the buffer material Q[).

In addition, among the tanks (6) to be drawn in, a predetermined tank (
6), that is, the front and rear ends of the 3Mth tank (6C) and the rear end IC of the first tank (6A) are provided with a transverse bulkhead (4) in advance. In this way, IKJ, tank + 6) and transverse bulkhead (4)? If it is installed, the installation work will be easier than when the transverse bulkhead (4) is narrowed and installed inside the hold (3).

When all the tanks (6) are pulled into the designated positions in the hold (3), the ballast water is discharged and the hull (1) is retracted.
Float the seawater in the hold (3) and drain the tank + via the first and second buffers
6) (111+ part is supported on the pedestal (7) of the hull (1) control.
3) In the lower part, that is, the middle part heat insulation material of both 1111 parts +12
An upper heat insulating material (to) is provided to connect the F ends and insulate the lower part of the tank (6). 1 on the hold floor plate (3a). Finally, the top of the tank (6) is held by the upper support (toward) by the hold top plate (3b) K.

In the above embodiment 2, the pedestal (7) and the support stand U3 are located on the bilge hopper (5) side of the hold (3) and on the tank (6) side, respectively.
) side so that the west facing surface was horizontal, but this was due to the fact that the dunk (6) was used for discharging ballast water with the tank (6) retracted into the hold (3). In the case where the acid part is supported by a suitable means such as a jack, the pedestal (7) is used for 1c.
) The bottom and support stand (to) are each a bilge hopper (5)
, the contact surface may be inclined from the tank (6).

fzh, how to install the above tank is di Even if you load a large tank into a new L/1 hull, is it still an old tank? It goes without saying that this can be applied even when loading onto a new ship, but when transferring tanks (6) from an old hull to a completely new hull, remove 1 part of the heat insulation material before pulling tanks (6) from the old hull out to sea. Attach the support base (13) to the chamfer.
Thereafter - withdrawal to sea and retraction into the ship's hull is carried out.

In the above embodiment 1c and b, the tank was 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 drawn into the hold from the rear of the hull.

In the above explanation, as shown in Akira, the low-temperature J gas carrier of the present invention has two
According to the tank mounting method, after the tank is pulled into the hold, a support stand for the tank is placed on the pedestal on the hull side, making positioning easier.

In addition, since the upper part of the tank's support base and the dowels in the hold are each covered with heat insulating material, the heat insulating work only needs to be done at the bottom of the tank after the tank is installed.

(According to the tank mounting method of the present invention, the following effects can be obtained.

O To support the tank with part of the bilge hopper,! 1))
High stability against body rolling.

The position of the tank corresponding to the bilge hopper in the O hold is located near the IA: section of this tank, and the empty tank is generally below this position when the tank is pulled out to sea 1. Most of the parts of the new IyzJl tank, except for the bottom part of the tank, can be pre-installed with heat insulating material. The removal area of heat insulating material is small, and in P17-1 inside the new hull, only the heat insulating work at the bottom of the tank is required. There are no obstructions and construction is extremely easy.

[Brief explanation of the drawing]

The drawings show a specific 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. 3 is a view taken from the f-1 arrow in FIG. Figure 4 is the same as Figure 1.
- ■ Arrow view, Figure 5 is a diagram explaining the loading procedure, '@6 Figure is a l1l-1ll arrow view of Figure 5, Figure 7 is a view equivalent to Figure 6 of 9, FIG. 8 is an enlarged view of the bar portion of FIG. 7. (1)...hull, (2)...low temperature liquefied gas carrier,
(3)...Hold, (3a)...Floor plate, (3b)...
・Top plate, (4)...Horizontal bulkhead, 15)...Part of bilge hopper, (6)...Tank for low temperature liquefied gas storage, (7)
- pedestal, ul...first buffer material-tll)...inner circumferential heat insulating material, u2--middle heat insulating material, 0. )...Support stand, 0υ...Second buffer material, ση...Upper heat insulation material, (To)...Lower heat insulation material agent Yoshihiro Soki Figure 7 Figure β

Claims (1)

[Claims] 1. Launching a ship built with one end of the hold open and without a transverse bulkhead inside the hold, and with a cradle for a low-temperature liquefied gas storage tank installed in a part of the bilge hopper of the hold. The tank was submerged in a semi-submersible state, and then a tank for low-temperature liquefied gas storage, which had a support stand attached to its outer circumference at a position corresponding to the N3 cradle in front of a part of the bilge hopper in the hold, was placed offshore.
Draw the tank into the hold with Gakubero, /K
K+IU Note 41) A tank mounting method for separating into a low-temperature liquefied gas carrier, characterized by supporting the tank on a pedestal of a part of a bilge hopper in a hold via its support stand.