JPH0717671Y2 - Insulation tank independent tank for liquefied gas carrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a heat insulating structure for an independent tank of a liquefied gas carrier.

[Conventional technology]

In a liquefied gas carrier, for example, as shown in the horizontal cross-sectional view of FIG. 5, there is an appropriate space in the horizontal direction on the inner bottom plate 016 forming a part of the inner shell 015 formed inside the outer plate 014. Conventionally, as a heat insulating structure of a liquefied gas independent tank (hereinafter referred to as a tank) 019 mounted on a plurality of tank support bases 017 extending in the longitudinal direction via a tank support member 018,
For example, as shown in a partially enlarged view of FIG. 6, the inner bottom plate 016 and the tank support 017 are heat-insulated by a heat insulating material 020, and the surfaces thereof are covered with a secondary wall type surface material 021 to be liquid-tight, and the tank 019 The surface of the tank 019 is heat-insulated by the heat-insulating material 022, and the surface of the tank 019 is heat-insulated by the heat-insulating material 022, as shown in FIG. It is known that the inner bottom plate has a low temperature resistance method in which the surface material 023 is covered. Here, 027 is the hold.

In these heat insulating structures, if a crack 024 occurs in the tank 019, the leaked liquefied gas 025 is a heat insulating material in which the surface of the tank 019 and the surface are covered with a surface material 023 as shown in a partially enlarged view of FIG. Through a slight gap 026 provided between the back surface of the material 022 and the bottom surface of the tank 019, as shown by the arrow, the leaked liquefied gas 025 flows between the heat insulating material 022 and the heat insulating material 02.
2 through the tank support 018 and the secondary barrier type surface material 021
Or it is expected that it will flow down onto the inner bottom plate 016a, but this accident is dealt with by the secondary wall type surface material 021 and the heat insulating material 020 in the inner bottom plate full heat insulation method, and in the inner bottom plate low temperature resistant method. 016a, tank support 017a, adjacent hull structure, etc. are dealt with by using low temperature resistant steel.

However, such a structure has the following drawbacks.

(1) In the inner bottom plate whole surface heat insulation method, since the heat insulation range is wide and the secondary wall type surface material 021 is liquid-tightly formed, the material cost is increased and the work is difficult.

(2) In the low temperature resistant inner bottom plate method, since high quality steel is used for a wide range of hull structures, the material cost is high.

[Problems to be solved by the invention]

The present invention has been proposed in view of such circumstances,
It is an object of the present invention to provide an economical liquefied gas carrier independent tank heat insulating structure that does not require high material costs and is easy to work.

[Means for solving problems]

To this end, the present invention is supported by a plurality of tank supports placed side by side on the inner bottom plate at appropriate intervals via tank support members and covered with a heat insulating material having a surface material attached thereto. In a separate tank for a liquefied gas carrier, a liquid-permeable heat-insulating material arranged between a plurality of heat-insulating materials on the bottom of the tank, and a plurality of drainage liquids connected to the surface material below the liquid-permeable heat-insulating material. And a drainage pipe in which an automatic drainage valve that communicates with the lower surface opening of the drainage passage and releases the leaked liquefied gas is inserted, and a heat insulating material is mounted on the inner bottom plate below each drainage pipe. And an evaporator that evaporates the leaked liquefied gas flowing from the drain pipe and discharges it.

[Action]

With the above-mentioned configuration, the leakage of liquefied gas in the cargo hold without applying heat insulating material and secondary wall type surface material on the inner bottom plate and without using high quality steel for low temperature on the inner bottom plate Can be safely discharged.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a horizontal sectional view at the tank support level, FIG. 2 is a horizontal sectional view taken along line II-II of FIG. 1, and FIG. Figure II
FIG. 4 is a vertical sectional view taken along line I-III, and FIG. 4 is a vertical sectional view taken along line IV-IV in FIG.

In the above figure, the same reference numerals as those in FIGS. 5 to 8 indicate the same members as those in the same figure, respectively, and 1 indicates between the heat insulating material 022 divided into a plurality of heat insulating materials 022 and the tank supporting material 018 on the bottom surface of the tank 019. The liquid-permeable heat insulating material 2 respectively inserted between the two is connected to the surface material 023 below the liquid-permeable heat insulating material 1 to form a plurality of U-shaped discharges extending in the left-right direction so that the longitudinal section can be thermally contracted. The liquid passages 3 extend downward from the bottom surface of the central portion of each drainage passage 2, and the drainage pipes 4 are connected to the lower ends of the drainage pipes 3 via fasteners 5 and the relative displacement between the tank 019 and the inner bottom plate 016. A flexible joint pipe for absorbing liquefied gas, 6 a liquefied gas automatic drain valve connected to the lower end of the flexible joint pipe 4 through a fastener 7, and 8 a fastener 9 for each automatic drain valve 6. A duct having a flat rectangular cross section that is connected to each other through the drainage pipe 10 and that extends in the front-rear direction at the center in the left-right direction above the inner bottom plate 016 Tongue-shaped evaporator, 11 is an exhaust port cut out in the central upper surface of the evaporator 8, 12 is a heat insulating material installed between the evaporator 8 and the inner bottom plate 016, and 13 is a heat insulating material
A heat insulating material made of the same material as 22.

In such a structure, as shown in FIG.
If liquefied gas 025 leaks due to cracks 024 etc. in tank 019, it is spray shielded by heat insulating material 022,
The liquefied gas 025 flows down through a slight gap 026 between the tank 019 and the heat insulating material 022, and the liquefied gas 025 is provided between the heat insulating material 022 divided into a plurality of pieces on the bottom surface of the tank 019 or between the heat insulating material 022 and the tank supporting material 018.
When it reaches the liquid-permeable heat insulating material 1 provided between the heat-insulating material 022 and the discharge passage 2 attached to a part of the liquid-tight surface material 023 of the heat-insulating material 022, the liquefied gas 025 It flows along the discharge path 2, flows into the drainage pipe 3, automatically opens the automatic drainage valve 6 due to its low temperature characteristic, and then flows into the evaporator 8.

Here, the entire amount of the liquefied gas 025 is vaporized by the heat entering from the hold 027, escapes to the gas 028 from the exhaust port 11 (FIG. 1) of the evaporator 8, and at that time, the heat insulation provided on the bottom surface of the evaporator 8 Material
12 prevents the temperature of the inner bottom plate 016 from being lowered by the liquefied gas 025.

As described above, the liquefied gas 025 flowing out from the tank 019 is safely discharged.

With such a structure, the following effects can be obtained.

(1) Since it is unnecessary to apply a heat insulating material and a secondary wall type surface material to the inner bottom plate and the tank support, the material cost is reduced and the work is facilitated.

(2) Since it is not necessary to use high-quality steel materials for low temperatures such as the inner bottom plate and the tank support, the material cost is reduced.

(3) When the liquefied leaked gas is discharged, it is not immediately discharged to the hold, but is collected in one evaporator using the drainage channel that is continuous with the surface material of the heat insulating material. Is easy to manage.

(4) Since the leaked liquefied gas flows in a liquid state through the drainage passage in the heat insulating layer and becomes a room temperature gas when it goes out to the hold, the low temperature problem of the liquefied gas is eliminated and the safety is improved.

[Effect of device]

In short, according to the present invention, a heat insulating material which is supported on a plurality of tank supporting bases arranged in parallel on the inner bottom plate via tank supporting materials and has a surface material adhered to the surface thereof. In an independent tank for a liquefied gas carrier covered with, a liquid-permeable heat-insulating material arranged between a plurality of heat-insulating materials on the bottom surface of the tank and a plurality of liquid-cooling materials connected to the surface material below the liquid-permeable heat-insulating material. The drainage passage, a drainage pipe in which an automatic drainage valve that communicates with the lower opening of the drainage passage and releases the leaked liquefied gas is inserted, and a heat insulating material on the inner bottom plate under each drainage pipe. Since it is equipped with an evaporator that is placed on the tank and evaporates the leaked liquefied gas that flows in from the drain pipe and discharges it, the cost of materials does not increase and an economical liquefied gas carrier independent tank heat insulation structure that is easy to work Therefore, the present invention is extremely useful in industry.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view at the tank support level of one embodiment of the present invention, FIG. 2 is a horizontal sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. Longitudinal sectional view along the fourth
The drawing is a vertical sectional view taken along the line IV-IV in FIG. FIG. 5 is a cross-sectional view showing a hold of a known liquefied gas carrier,
6 and 7 are partially enlarged views showing different heat insulating procedures on the bottom plate in the hold of FIG. 5, respectively, and FIG. 8 is a partially enlarged view showing part VIII of FIG. DESCRIPTION OF SYMBOLS 1 ... Liquid-permeable heat insulating material, 2 ... Drainage channel, 3 ... Drainage pipe, 4 ... Flexible joint pipe, 5 ... Fastening fitting, 6 ... Automatic draining valve, 7 ... Fastening fitting, 8 ... Evaporator, 9 ... Fastener, 10 ... Drain pipe, 11 ... Exhaust port, 12 ... Heat insulating material, 13 ... Heat insulating material, 016 ... Inner bottom plate, 017 ... Tank support base, 018 ... Tank support material, 019 ... Tank, 022 ... Heat insulation Material, 023 ... Surface material, 024 ... Crack, 025 ... Liquefied gas, 026 ...
Clearance, 027 ... Funakura, 028 ... Gas.

Claims (1)

[Scope of utility model registration request] 1. A heat insulating material, which is supported on a plurality of tank supporting bases arranged in parallel on an inner bottom plate at appropriate intervals via a tank supporting material and has a surface material adhered to the surface thereof. In a separate tank for a liquefied gas carrier, a liquid-permeable heat-insulating material arranged between a plurality of heat-insulating materials on the bottom of the tank, and a plurality of drainage liquids connected to the surface material below the liquid-permeable heat-insulating material. And a drainage pipe in which an automatic drainage valve that communicates with the lower surface opening of the drainage passage and releases the leaked liquefied gas is inserted, and a heat insulating material is mounted on the inner bottom plate below each drainage pipe. A heat insulating structure for an independent tank of a liquefied gas carrier, comprising: an evaporator that is installed and that evaporates and discharges the leaked liquefied gas that flows in from the drainage pipe.