JPH06337097A - Cold insulation device surrounding support seat for liquefied gas tank - Google Patents

Abstract

PURPOSE:To prevent heat conduction between the end of a cold insulation material fitted to the external side of a liquefied gas tank and the support seat thereof, and improve liquid-tightness. CONSTITUTION:A horizontal bulge section 5 is formed on the outer surface of a support seat 2 to bear the bottom of a liquefied gas tank at the intermediate level of height 4. The end of a cold insulation material fitted to the bottom of the tank 1 is kept in contact with the upper surface 10 of the section 5 of the seat 2, so that the end of the material 6 is slidable along the upper surface 10 of the section 5 in close contact state. In addition, the lower surface 8 of the section 5 is kept flush with the lower surface 12 of the material 6, and a liquid-tight tape 13 is pasted to the flush plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device around a liquefied gas tank support for attaching a cold insulating material around a support supporting a liquefied gas tank.

[0002]

2. Description of the Related Art A conventional cooling device around a liquefied gas tank support base will be described with reference to a sectional view of FIG. 4. An aluminum liquefied gas tank a provided inside an LNG ship or the like has a bottom portion at an appropriate number of locations. It is supported by the hull g on a support base b made of a material having high strength and high heat insulation such as plywood. A relatively hard cooling material c such as polyurethane foam is attached to the outside of the liquefied gas tank a so that the liquefied gas in the liquefied gas tank a can be kept at a low temperature.

Since the temperature of the liquefied gas tank a changes depending on the presence or absence of liquefied gas inside and expands and contracts, if the edge of the cold insulating material c is adhered to the support base b, the cold insulating material c is distorted and damaged. The edge of the cold insulating material c directly attached to the liquefied gas tank a is not adhered to the supporting base b, and glass wool d is filled between the edge of the cold insulating material c and the supporting base b to keep the external heat cold. The material is prevented from being transmitted to the liquefied gas tank a from between the edge of the material c and the support base b.

In the unlikely event that liquefied gas leaks from the liquefied gas tank a, glass wool d between the edge of the cold insulating material c and the support b.
If the liquefied gas leaks from the liquefied gas tank a, the leaked liquefied gas will not reach the hull g even if the liquefied gas leaks from the liquefied gas tank a. Conventionally, as shown by phantom lines in FIG. 4, a gutter f for receiving the leaked liquefied gas has been provided on the outer peripheral portion of the support base b, but it is not necessary to provide a gutter f for each support base b. Since it is uneconomical, the provision of the gutter f for each support base b is stopped, and instead, an aluminum foil is provided from a position near the edge of the lower surface of the cold insulating material c to the lower end of the glass wool d and the side surface of the support base b. Attach the tape e that integrates the glass cloth to the inner surface of the to seal it,
The leaked liquefied gas was intensively collected from a required location such as the central bottom of the liquefied gas tank a.

[0005]

However, in the conventional device shown in FIG. 4, since the glass wool d is only filled between the edge of the cold insulating material c and the support b, cold air is easily released, and Since the structure is not dense, the tape e is attached and sealed to prevent liquid leakage when the liquefied gas leaks from the liquefied gas tank a, from the position near the edge of the lower surface of the cold insulating material c to the side surface of the support base b. Since it is a corner portion that is bent at a right angle over the entire length, it is very difficult to attach the tape e, and it is very difficult to maintain a liquid-tight structure especially at the four corner portions of the support base b. was there.

The present invention eliminates such conventional drawbacks,
An object of the present invention is to provide a cooler around a liquefied gas tank support, which makes it difficult for cold air to escape from between an edge of a cold insulating material attached to the outside of a liquefied gas tank and a support, and which can improve liquid tightness. It is a thing.

[0007]

According to another aspect of the present invention, there is provided a cooling device around a liquefied gas tank support, wherein a horizontal protrusion is formed on an outer periphery of a height of a support which supports a bottom of the liquefied gas tank. The edge of the cold insulating material attached to the bottom is brought into contact with the upper surface of the overhanging portion of the support, and the lower surface of the overhanging portion and the lower surface of the cold insulating material are flush with each other, and the liquid tight tape is attached to the flat surface. In addition, a horizontal projecting portion is formed on the outer periphery at the middle of the height of the support base that supports the bottom of the liquefied gas tank, and the edge of the hard cool material attached to the bottom of the liquefied gas tank is attached to the support base. The upper surface of the overhanging portion is abutted, the soft cold insulating material is disposed on the lower surface side of the hard cold insulating material, and the edge of the soft cold insulating material is bonded to the side surface of the overhanging portion. .

[0008]

[Function] Since the edge of the cold insulating material is in contact with the upper surface of the overhanging portion, the gap between the cold insulating material and the periphery of the support is eliminated, heat is not transferred to the liquefied gas tank, and the expansion and contraction due to the temperature change of the cold insulating material , The edge of the cold insulating material is slidably displaced on the upper surface of the overhanging portion so that it can be dealt with without damage, and further, a liquid tight tape is provided between the lower surface of the overhanging portion and the lower surface of the cold insulating material on the same plane. Since it is pasted, the workability of pasting is improved and the liquid tightness is surely maintained.

Further, in the case where the soft cold insulating material is arranged on the lower surface of the hard cold insulating material, the soft cold insulating material expands and contracts due to the temperature change in a state where the edge of the soft cold insulating material is adhered to the side surface of the overhanging portion. It is liquid-tight and will not be damaged.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a cross-sectional view of an embodiment of the invention of claim 1, in which the bottom of the liquefied gas tank 1 made of aluminum provided inside the LNG ship or the like has an appropriate number of places such as wood plywood. Is supported on the hull 3 by a support base 2 made of a material having high strength and high heat insulation. A horizontal overhanging portion 5 is integrally formed on the outer periphery of the height of the support base 2 in the middle thereof.

The thickness 7 of the relatively hard cooling material 6 such as polyurethane foam attached to the outside of the bottom of the liquefied gas tank 1 is equal to the dimension from the outer surface of the bottom of the liquefied gas tank 1 to the lower surface 8 of the overhang 5. The edge of the cold insulating material 6 attached to the bottom of the liquefied gas tank 1 has an appropriate space between the outer periphery 9 of the support base 2 above the projecting portion 5 and the side surface 11 of the projecting portion 5. The upper surface 10 of the overhanging portion 5 is kept in contact with the upper surface 10 while being kept.
In FIG. 1, reference numeral 16 is a heat insulating material such as glass wool filled in a gap between the edge of the cold insulator 6 and the outer periphery 9 of the support 2 above the overhanging portion 5 and the side surface 11 of the overhanging portion 5. is there.

Since the thickness 7 of the cold insulating material 6 is made equal to the dimension from the outer surface of the bottom of the liquefied gas tank 1 to the lower surface 8 of the overhanging portion 5, the lower surface 8 of the overhanging portion 5 and the cold insulating material 6 are formed. It is flush with the lower surface 12. Then, on this plane, a liquid-tight tape 13 is attached from a position near the edge of the lower surface 12 of the cold insulating material 6 to the lower surface 8 of the overhang portion 5.

In this embodiment, since the heat insulating material 6 is in close contact with the upper surface 10 of the overhanging portion 5 and no gap is generated, heat is reliably cut off, and when the heat insulating material 6 expands and contracts in the horizontal direction due to temperature change. The edge of the cold insulating material 6 is the upper surface 10 of the overhang portion 5.
The tape 13 can be dealt with without being damaged by sliding displacement, and when the tape 13 is attached, a flat surface is formed from a position near the edge of the lower surface 12 of the cold insulating material 6 to the lower surface 8 of the overhanging portion 5. Since it will be attached to the place where it is present, the attaching work can be performed extremely easily and the construction can be surely kept liquid-tight.

FIG. 2 is a cross-sectional view of an embodiment of the invention of claim 2, wherein the bottom of the liquefied gas tank 1 made of aluminum is made of a material having high strength and high heat insulation such as wood plywood. It is supported on the hull 3 by a supporting base 2 that is present, and a horizontal overhanging portion 5 is integrally formed on the outer periphery of the height 4 of the supporting base 2 in the middle. The thickness 7 of the relatively hard cooling material 6 such as polyurethane foam attached to the outside of the bottom of the liquefied gas tank 1 is made equal to the dimension from the outer surface of the bottom of the liquefied gas tank 1 to the upper surface 10 of the overhang 5. The cold insulating material 6 has an edge formed on the bulge 5 of the support base 2.
The upper surface 10 is abutted.

On the lower surface 12 of the relatively hard cooling material 6 such as polyurethane foam, a relatively soft cooling material 14 such as polyethylene foam is provided. The thickness of the relatively soft cold insulation material 14 is the same as the thickness of the overhang portion 5, and the edge of the cold insulation material 14 is bonded to the side surface 11 of the overhang portion 5.

When the cold insulating materials 6 and 14 expand and contract in the horizontal direction due to temperature change, the edge of the hard cold insulating material 6 can be slidably displaced on the upper surface 10 of the overhanging portion 5 without being damaged, Since the soft cooling material 14 can be expanded and contracted while the end edge thereof is adhered to the side surface 11 of the overhang portion 5, it can be dealt with without being damaged.

In this embodiment, the cold insulating material 6 does not come into close contact with the upper surface 10 of the overhanging portion 5 to form a gap, and the edge of the soft cold insulating material 14 is bonded to the side surface 11 of the overhanging portion 5. Therefore, it is possible to reliably block the heat and prevent the leaked liquefied gas from flowing out toward the hull 3. However, if necessary, the liquid from the location near the edge of the lower surface of the cold insulator 14 to the lower surface 8 of the overhanging portion 5 The tape 13 for close contact may be attached.

FIG. 3 is a cross-sectional view of another embodiment of the invention of claim 2, wherein the bottom of the liquefied gas tank 1 made of aluminum is made of a material such as wood plywood which is strong and has a high heat insulating property. It is supported by the hull 3 on a supporting base 2 which is horizontal, and a horizontal overhanging portion 5 is integrally formed on the outer periphery in the middle of the height 4 of the supporting base 2, and the outer peripheral lower surface of the overhanging portion 5 faces downward. A step portion 15 is provided.

The thickness 7 of the relatively hard cooling material 6 such as polyurethane foam attached to the outside of the bottom of the liquefied gas tank 1 is equal to the dimension from the outer surface of the bottom of the liquefied gas tank 1 to the upper surface 10 of the overhang 5. Thus, the edge of the cold insulator 6 contacts the upper surface 10 of the overhanging portion 5 of the support base 2.

On the lower surface 12 of the relatively hard cooling material 6 such as polyurethane foam, a relatively soft cooling material 14 such as polyethylene foam is provided. The thickness of the relatively soft cold insulation material 14 is the same as the thickness of the overhang portion 5, and the edge of the cold insulation material 14 is adhered to the side surface 11 of the overhang portion 5 and the downward step portion 15. As a result, since the soft cold insulator 14 has adhesive surfaces in both the horizontal and vertical directions, it can be easily adhered by pressure bonding, and the attachment is more reliable than the embodiment of FIG.

When the cold insulating materials 6 and 14 expand and contract in the horizontal direction due to temperature changes, the edge of the hard cold insulating material 6 can be slidably displaced on the upper surface 10 of the overhanging portion 5 without being damaged, Since the soft cooling material 14 can be expanded and contracted while the end edges thereof are adhered to the side surface 11 of the overhanging portion 5 and the downward step portion 15, it can be dealt with without being damaged.

In this embodiment, the heat insulating material 6 does not come into close contact with the upper surface 10 of the overhanging portion 5 to form a gap, and the edge of the soft cold insulating material 14 is the side surface 11 of the overhanging portion 5 and the step portion 15 facing downward. Since it is adhered to the sheet, the heat is blocked and the leaked liquefied gas is prevented from flowing out toward the hull 3 more reliably than in the embodiment of FIG. A liquid-tight tape 13 may be attached from a near position to the lower surface 8 of the overhang portion 5.

The cooling device around the liquefied gas tank support according to the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the present invention. is there.

[0025]

According to the first aspect of the present invention, since the cold insulating material does not come into close contact with the upper surface of the overhanging portion to form a gap, heat is reliably cut off, and when the cold insulating material expands and contracts in the horizontal direction due to temperature change. Has an effect that the edge of the cold insulating material can be slidably displaced on the upper surface of the overhanging portion to prevent the damage from being damaged. In addition, there is an effect that liquid tightness can be surely achieved by sticking the tape on the same plane.

According to the second aspect of the present invention, since the hard cold insulator does not come into close contact with the upper surface of the overhang portion to form a gap, and the edge of the soft cold insulator is bonded to the side surface of the overhang portion, heat There is an effect that the shutoff and the prevention of the leaked liquefied gas in the direction of the hull are ensured.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the invention of claim 1;

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

FIG. 3 is a sectional view of another embodiment of the invention of claim 2;

FIG. 4 is a cross-sectional view of a conventional device.

[Explanation of symbols]

 1 Liquefied gas tank 2 Support 4 Height 5 Overhanging part 6 Cooling material 9 Outer periphery 10 Upper surface 11 Side surface 12 Lower surface 13 Tape 14 Cooling material

Claims (2)

[Claims] 1. A horizontal projecting portion is formed on an outer periphery of a height of a support table that supports the bottom portion of the liquefied gas tank, and an edge of a heat insulating material attached to the bottom portion of the liquefied gas tank is formed on the projecting portion of the support table. A cooler around the liquefied gas tank support, characterized in that the lower surface of the overhanging portion and the lower surface of the cold insulating material are flush with each other, and a liquid tight tape is attached to the flat surface. 2. A horizontal projecting portion is formed on an outer periphery of a height of a support table supporting a bottom portion of the liquefied gas tank, and an edge of a hard cold insulator attached to the bottom portion of the liquefied gas tank is formed on the projecting portion of the support table. Of the liquefied gas tank supporting base around the liquefied gas tank support, characterized in that a soft cold insulating material is disposed on the lower surface side of the hard cold insulating material, and an edge of the soft cold insulating material is bonded to the side surface of the overhang portion. Cooler.