JPS6030560Y2 - Insulation structure of low temperature liquefied gas carrier - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat insulating structure for a low-temperature liquefied gas carrier that can sufficiently resist sloshing (impact caused by movement of liquid) of liquid in a tank.

The insulation structure of conventional low-temperature liquefied gas ships such as LNG ships and LPG ships, especially when they are membrane type, is such that the insulation structure is in contact with the membrane 7 containing LNG or LP01, as shown in the center cross-sectional view of the ship in Figure 3. It has a structure in which a heat insulating layer 6 is provided.

As shown in Figure 1a and b, this heat insulation structure
Support plates 3 are arranged in a grid pattern between the top plate 1, the bottom plate 2, and the support plate 2, and each space surrounded by the top plate 1, the bottom plate 2, and the support plate 3 is filled with a granular heat insulating material, for example, perlite powder 4. be.

The top plate 1, bottom plate 2, and support plate 3 are usually made of plywood.

In this configuration, the pressure of the tank liquid 8 applied to the top plate 1 via the membrane 7 is simply supported by the support plate 3, so when high pressure is generated due to the above-mentioned sloshing of the tank liquid 8, the high pressure The top plate 1 was bent, and this bending stress caused the top plate 1 to break and damage the membrane 7, resulting in many accidents.

Therefore, in order to increase the strength of the top plate 1, the thickness of the top plate 1 has been increased or the number of support plates 3 has been increased. The thicker it is, the more it affects the cost, and there is also a limit to the thickness itself.

Even if the thickness of the top plate 1 is increased, the pressure from the liquid 8 in the tank is received by the support plate 3, so the load is concentrated on the part where the top plate 1 contacts the support plate 3, and the top plate in this part sheet metal plate 1
The fibers of the top plate 1 were easily damaged, and the strength of the top plate 1 was sometimes reduced.

On the other hand, increasing the number of supporting plates 3 increases the number of paths through which heat can travel, which is a disadvantage of defeating the original purpose of heat insulation.

The present invention solves the above-mentioned drawbacks of the conventional insulation structure of a low-temperature liquefied gas ship, and provides an insulation structure of a low-temperature liquefied gas ship that can sufficiently resist sloshing of the liquid in the tank. A low-temperature liquefied gas produced by arranging plywood support plates in a lattice pattern between a plywood top plate and a bottom plate, and filling each space surrounded by the top plate, bottom plate, and support plate with granular heat insulating material. In the thermal insulation structure of a ship, a part of the powder insulation material has a height corresponding to the distance between the top plate and the bottom plate, and has a pressure-resistant solid insulation along the vertical and horizontal directions on both sides of the support plate. An insulation structure for a low-temperature liquefied gas carrier characterized by the use of
It is in.

Next, the present invention will be explained with reference to the drawings.

FIG. 2 is a sectional view of an embodiment of the present invention.

In FIG. 2, in this embodiment, support plates 3 are arranged in a grid pattern between the top plate 1 and the bottom plate 2, and each space surrounded by the top plate 1, the bottom plate 2, and the support plate 3 is filled with conventional filling. A part of the granular heat insulating material 4 that has been used as a material has a height corresponding to the distance between the top plate 1 and the bottom plate 2, and is a pressure-resistant solid heat insulating material along the vertical and horizontal directions on both sides of the support plate 3. This configuration uses material 5.

The pressure-resistant solid insulation materials used in the present invention include balsa wood, polyurethane foam, polyvinyl chloride foam, etc.

These pressure-resistant solid insulation materials are the top plate 1, the bottom plate 2, and the support plate 3.
Although it is possible to completely fill the space surrounded by , it is not necessary to do so as the construction work for this is troublesome. Pressure-resistant solid heat insulating material 5 is inserted along the longitudinal and lateral directions on both sides of the support plate 3 and has a height corresponding to the spacing of . 4 may be filled.

In other words, it is desirable to support the top plate 1 entirely with a pressure-resistant solid insulating material 5 that has strength, but even if there is a gap, if the gap is narrow, the bending applied to the top plate 1 will be Since the space decreases in proportion to the square of the span, the concentrated load applied to the top plate 1 can be eliminated by placing the solid heat insulating material 5 in the space to support it.

That is, the pressure strength of the top plate 1 and, by extension, the strength of the entire heat insulating structure increases.

In this way, the present invention improves the pressure resistance of the top plate 1 by combining the lattice-shaped support plate 3 and the pressure-resistant solid heat insulating material 5 having a height corresponding to the distance between the top plate 1 and the bottom plate 2. This is intended to strengthen the situation.

It should be noted that it is inappropriate to completely insert the above-mentioned solid heat insulating material between the top plate 1 and the bottom plate 2 and eliminate the support plate 3 from the viewpoint of the strength of the heat insulating material and other characteristics such as creep distortion. .

The effects of the present invention are as follows.

(1) The Shinjo strength of the heat-insulating structure can be significantly increased without reducing the heat-insulating properties of the heat-insulating structure.

(2) Construction is easy and costs are low.

As described above, the present invention provides a heat insulating structure for a low-temperature liquefied gas ship that can sufficiently resist sloshing of liquid in the tank, and is extremely useful for maintenance management of LNG ships, LPCa, etc.

[Brief explanation of the drawing]

Figure 1a is a perspective view of an example of the heat insulation structure of a conventional low-temperature liquefied gas ship, b is a sectional view of a, Figure 2 is a sectional view of an embodiment of the present invention, and Figure 3 is a perspective view of an example of the insulation structure of a conventional low-temperature liquefied gas carrier. It is an example of a cross-sectional view of the center part of the hull of a ship. In the figure, 1...top plate, 2...bottom plate, 3...support plate, 4...powder insulation material, 5...・Solid insulation material, 6...Insulation layer,
7...Membrane, 8...Liquid in tank (LNG, LPG).

Claims (1)

[Scope of utility model registration request] A low-temperature system made by placing plywood support plates in a grid pattern between a plywood top plate and a bottom plate, and filling the spaces surrounded by the top plate, the bottom plate, and the support plate with granular heat insulating material. In the insulation structure of a liquefied gas carrier, a part of the powder insulation material has a height corresponding to the distance between the top plate and the bottom plate, and is made of pressure-resistant solid material along the vertical and horizontal directions on both sides of the support plate. A thermal insulation structure for a low-temperature liquefied gas carrier characterized by the use of type insulation material.