JPH06321287A - Tank for transport - Google Patents

Abstract

PURPOSE:To provide an LNG tank in which loading efficiency is high and which can be manufactured easily and at a low cost. CONSTITUTION:The title tank is a tank which is built in a ship body 11 and made of membrane members 5 in which corrugation 4 is formed both in the vertical and horizontal directions at prescribed intervals. This tank 1 is formed of a rear tank part 2 whose shape seen in a top plan view is rectangular and a front tank part 3 which is arranged in continuation from the rear tank part 2. In this instance, the width of the front tank part 3 is designed to be narrower than that of the rear tank part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LNG tank mounted on an LNG transport ship, for example.

[0002]

2. Description of the Related Art Conventionally, LNG mounted on an LNG transport ship
In the membrane tank system for use, as a general rule, it was composed of a stainless steel membrane material in which wrinkles called corrugates that run vertically and horizontally at 340 mm intervals (pitch) were formed.

As described above, the corrugated structure is used because the LNG has an extremely low temperature and absorbs the expansion and contraction of the tank itself due to temperature changes and hull deformation.

As shown in FIGS. 9 (a) to 9 (c), in this type of tank 101, the corrugations 102a and 103a of the adjoining membrane materials 102 and 103 are continuous on their ridge lines, and In order to easily perform the connection process between the corrugations, the adjacent membrane materials 1
The intersection angle θ between 02 and 103 is 135 degrees (or 90
And the cross-sectional shape in the length direction was the same. 9A is a plan view of the tank,
(B) is the same front view, (c) is the same side view.

For this reason, the width of the tank 101 is made uniform over the entire length, and therefore the tank 101 shown in FIG.
As shown in, the width of the NO.1 tank 101A arranged near the bow portion of the hull 111 is narrowed in accordance with the hull width of the bow portion.

However, since the width of the NO.1 tank 101A is adjusted to the narrow width of the bow portion and close to the bow, a dead space S occurs in the hull 111 near the stern side of the NO.1 tank 101A. Therefore, there is a drawback that the loading efficiency becomes very poor.

In order to eliminate such a drawback, as shown in FIGS. 11 and 12, the tank 121
It has been proposed to make the planar view shape of the trapezoidal.

[0008]

However, as described above, when the shape of the tank in plan view is simply trapezoidal, the corrugations on the upper and lower wall surfaces of the tank horizontal portion 121a and the corrugations on the inclined wall surface of the tank chamfer portion 121b are formed. At the time of connection processing, in order to connect one corrugated wall, for example, the corrugated space on the inclined wall surface to the corrugated space on the upper and lower wall surfaces, it is necessary to match the space, or the angle at which both wall surfaces intersect is 135 degrees (or 9 degrees).
Since it slightly deviates from 0 degree), there are problems that the manufacturing process of the tank is increased, and the types of heat insulating panels to be installed on the outer side of the tank are increased, leading to an increase in cost.

[0009] Therefore, an object of the present invention is to provide a tank for a transport ship which can solve the above problems.

[0010]

In order to solve the above-mentioned problems, the first means of the present invention is a tank which is mounted on a hull and is made of a membrane material having corrugates formed at predetermined intervals in the vertical and horizontal directions. And a first tank part having a rectangular shape in plan view and a second tank part extending from the first tank part.
And a tank for a transport ship in which the width of the second tank portion is different from each other.

In order to solve the above problems, the second means of the present invention is the first and second means of the first means.
It is a tank for a transport ship in which the heights of the tank parts are different from each other.

[0012]

According to the structure of the first means, the tanks arranged at the positions where the width dimension of the hull changes have different shapes in two steps in the width dimension, so that the space in the hull can be effectively utilized. In addition, the heat insulating panel that can be used in the conventional rectangular tank can be used as it is, for example, when the tank needs a heat insulating structure.

According to the structure of the second means, in addition to the first means, the heights of both tank parts are made different, so that the space can be effectively used in the height direction. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 and FIG. 2, reference numeral 1 denotes, for example, a shape change position of a hull 11 of an LNG transport ship, that is, an LNG tank (transport ship tank) arranged at a bow 12, which runs in vertical and horizontal directions at 340 mm intervals (pitch) in principle. It is composed of a stainless steel membrane material 5 on which wrinkles or corrugations 4 are formed.

The front view of the tank 1 has an octagonal shape, and the widths of the front and rear portions of the tank 1 are different in the plan view. That is, depending on the shape of the bow 12 of the hull 11, the tank 1 itself
A wide rear tank portion (first tank portion) 2 on the stern side,
It is composed of a narrow front tank portion (second tank portion) 3 extending from the front end surface of the rear tank portion 2 on the bow side. Of course, the cross-sectional shape of each of these tank portions 2 and 3 is octagonal.

By using such a two-stage tank, the corrugate 5 of the membrane material 4 which constitutes the tank is formed.
The space may be the same as the conventional one, so that the heat insulating panel that can be used in the conventional rectangular tank can be used as it is, and the LNG tank can be almost in line with the bow shape of the hull without increasing the cost. Since it can be shaped, the dead space of the hull can be effectively used.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the first embodiment,
Only the widths of the upper and lower surfaces of the front tank portion are narrowed so that the side surface portions of the front tank portion and the rear tank portion have the same shape. However, in the second embodiment, FIG. 3 and FIG.
, The tank 21 having the same cross-sectional shape along the entire length.
Both sides of the front tank portion 23 are cut with a predetermined thickness (δ).

That is, the upper portions of the front tank portion 23 and the rear tank portion 22 have the same shape, but the shape of the side surface portion is such that the front tank portion 23 is wider than the rear tank portion 22 in its width. The shape is also narrowed.

Also in this case, the same effect as that of the first embodiment can be obtained. Next, a third embodiment of the present invention will be described with reference to FIGS. In the second embodiment described above, both sides of the front tank portion of the tank having the same cross-sectional shape over the entire length are cut with a predetermined thickness (δ), but in the third embodiment, As shown in FIGS. 5 and 6, in a tank 31 similar to that of the second embodiment, the bottom portion of the front tank portion 33 is cut out at a predetermined height (h).

In this case, the same effect as in the first embodiment,
That is, it is possible to effectively use the dead space in the width direction of the ship, and also in the case where the bottom of the bow is extremely thin and the height of the space inside the bow is low, only the rear tank portion 32 is provided. Since the height can be increased, the dead space can be effectively used even in the height direction of the hull.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 7 and 8. In the second embodiment,
Both sides of the front tank portion 23 of the tank 21 having the same sectional shape over the entire length are cut out with a predetermined thickness (δ), but in the fourth embodiment, it is shown in FIGS. 7 and 8. As described above, in the same tank 41 as that of the second embodiment, the front bottom portion of the front tank portion 43 whose width is narrower than that of the rear tank portion 42 is cut obliquely at an angle of 45 degrees with respect to the horizontal plane, for example. It is the one.

Also in this case, the same effect as that of the third embodiment can be obtained. In addition, in FIG. 4, FIG. 6 and FIG.
(A) is a plan view of the tank, (b) is a front view, and (c) is a side view.

By the way, in each of the above embodiments, the shape of the tank arranged on the bow side has been described, but of course, the shape of the tank arranged on the stern side can be applied. In this case, the rear tank portion of the tank is smaller in width or height than the front tank portion.

[0024]

As described above, according to the configuration of the present invention, the shape of the tank is simply a two-step shape having different widths on the one end side and the other end side. If necessary, it becomes possible to use the heat insulating panel that can be used in the conventional rectangular tank as it is,
Therefore, the tank can be formed to substantially conform to the bow shape or the stern shape of the hull without increasing the cost, so that the loading efficiency of the hull can be improved.

In addition, by making the heights of the tanks different from each other in addition to the width dimension, the height direction of the hull can be
The space can be effectively used, and thus the loading efficiency of the entire hull can be further improved.

[Brief description of drawings]

FIG. 1 is an external perspective view of a tank according to a first embodiment of the present invention.

FIG. 2 is a plan view showing how a tank is mounted on a hull in the first embodiment.

FIG. 3 is an external perspective view of a tank according to a second embodiment of the present invention.

FIG. 4 is a view showing the outer appearance of a tank according to the second embodiment.

FIG. 5 is an external perspective view of a tank according to a third embodiment of the present invention.

FIG. 6 is a view showing the outer appearance of a tank according to the third embodiment.

FIG. 7 is an external perspective view of a tank according to a fourth embodiment of the present invention.

FIG. 8 is a view showing the outer appearance of a tank according to the fourth embodiment.

FIG. 9 is a diagram showing an appearance of a tank in a conventional example.

FIG. 10 is a plan view of relevant parts showing a state in which a tank is mounted on a hull in a conventional example.

FIG. 11 is a plan view showing a modified example of a conventional tank mounted on a hull.

FIG. 12 is a front view of a tank in the modified example.

[Explanation of symbols]

 1 Tank 2 Rear Tank Part 3 Front Tank Part 4 Corrugate 5 Membrane Material 21 Tank 22 Rear Tank Part 23 Front Tank Part 31 Tank 32 Rear Tank Part 33 Front Tank Part 41 Tank 42 Rear Tank Part 43 Front Tank Part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Sumida 5-3-8, Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.

Claims (2)

[Claims] 1. A tank comprising a membrane material, which is mounted on a hull and has corrugations formed at predetermined intervals in the vertical and horizontal directions, the first tank section having a rectangular shape in plan view, and the first tank section. A tank for a transport ship, which is characterized in that it is composed of a second tank portion extended to the above, and the widths of the first and second tank portions are different from each other. 2. The tank for a transport ship according to claim 1, wherein the heights of the first and second tank portions are different from each other.