JPH08219399A - Nozzle piercing device for roof in low temperature liquefied gas storage device - Google Patents

Abstract

PURPOSE: To allow the number of sleeves to be reduced in comparison to the number of nozzles and narrow the installation range of the nozzles so as to reduce the labor of construction work such as welding. CONSTITUTION: A sleeve 4 is provided in such a way as to vertically piercing the roof 2 of a low temperature liquefied gas storage tank, and plural nozzles 3 are disposed in the sleeve 4. The number of sleeves 4 are reduced in comparison to the number of nozzles 3, and the installation range of the nozzles 3 is narrowed to reduce the labor of construction work such as welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for penetrating a roof of a low temperature liquefied gas storage tank for providing a nozzle through the roof of the low temperature liquefied gas storage tank.

[0002]

2. Description of the Related Art An example of a tank for storing a low temperature liquefied gas such as LNG will be described with reference to FIG.

FIG. 3 is a vertical cross-sectional view showing a schematic structure of a low temperature liquefied gas storage tank buried underground. 1 is a vertical cylindrical low temperature liquefied gas storage tank buried underground, and 2 is a low temperature liquefied gas. The dome-shaped roof of the storage tank 1,
3 is a tubular nozzle that extends vertically through the roof 2 and 4
Is a cylindrical sleeve attached to the portion where the nozzle 3 penetrates the roof 2 so as to surround the nozzle 3.

The detailed structure of the portion where the sleeve 4 penetrates the roof 2 will be described with reference to the enlarged vertical sectional view of FIG. 4. The roof 2 includes a reinforced concrete 5 on the upper side and a heat insulating material 6 attached to the lower surface of the reinforced concrete 5. , And a sealing membrane 7 made of a thin metal plate installed on the lower surface of the cold insulating material 6.

The sleeve 4 vertically penetrates the reinforced concrete 5, the cold insulating material 6, and the membrane 7 of the roof 2, the upper end of the sleeve 4 projects slightly above the upper surface of the reinforced concrete 5, and the lower end of the sleeve 4 is higher than the membrane 7. The sleeve 4 extends slightly downward and is welded to the membrane 7 at a position where the sleeve 4 penetrates the membrane 7.

The nozzle 3 is welded to the top plate 8 welded to the upper end of the sleeve 4, and the sleeve 4 is filled with a cold insulating material 9 so as to surround the nozzle 3.

When a low temperature liquefied gas such as LNG is stored in the low temperature liquefied gas storage tank 1 (see FIG. 3), the membrane 7 (see FIG. 4) causes thermal contraction due to cold heat. As described above, the corrugations 10 of the ridges are formed on the membrane 7 in a lattice shape so that the membrane 7 is easily deformed. And the aforementioned sleeve 4
5 penetrates through the membrane 7 at the lattice-shaped central portion of the corrugation 10 which is a fixed point of thermal contraction of the membrane 7 as shown in FIG.

[0008]

The nozzle 3 is used for receiving low-temperature liquefied gas into the low-temperature liquefied gas storage tank 1, for discharging low-temperature liquefied gas, for temperature measurement sensor, for liquid level measurement sensor, and for future use. A large number is required for all spares.

Conventionally, since the sleeves 4 are provided on the outer sides of the respective nozzles 3, it is necessary to provide the same number of the sleeves 4 as the number of the nozzles 3, and the corrugation 10 which is the center of the heat shrinkage of the membrane 7 is generated. When the sleeve 4 is provided in the central portion of the lattice, the installation range of the nozzle 3 is widened, and the stage provided on the low temperature liquefied gas storage tank 1 is also large.

In addition, there are many welding points between the sleeve 4 and the membrane 7 at positions where the sleeve 4 penetrates the membrane 7, which makes the construction work troublesome and increases the cost.

The present invention solves the above-mentioned conventional problems and requires a smaller number of sleeves than the number of nozzles, the installation range of the nozzles is narrow, and the work such as welding is reduced. It is an object of the present invention to provide a roof nozzle penetrating device in a low temperature liquefied gas storage tank which has been completed.

[0012]

A nozzle penetrating device for a roof in a low temperature liquefied gas storage tank of the present invention is provided with a sleeve so as to vertically penetrate the roof of the low temperature liquefied gas storage tank, and the low temperature liquefaction is provided in the sleeve. It is characterized in that a plurality of nozzles extending from the inside of the gas storage tank to the outside are provided.

[0013]

Since a plurality of nozzles are arranged in the sleeve, the number of sleeves is smaller than the number of nozzles, the nozzle installation range is narrowed, and the stage provided on the low temperature liquefied gas storage tank is also small. Therefore, the time and effort of construction work such as welding are reduced.

[0014]

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

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG.
2 is a view taken along the line II-II in FIG. 1, and the same parts as those shown in FIGS. 4 and 5 are designated by the same reference numerals.

Reinforced concrete 5 for roof 2, cold insulation 6,
The sleeve 4 provided by vertically penetrating the membrane 7 has a slightly larger diameter than the conventional one.
The membrane 7 is penetrated at the lattice-shaped central portion of the corrugation 10 which is a fixed point of the heat shrinkage.

A plurality of nozzles 3 are arranged inside one sleeve 4, and the sleeve 4 is filled with a cold insulating material 9 so as to surround all the plurality of nozzles 3.

Since a plurality of nozzles 3 are arranged inside one sleeve 4 as described above, the number of sleeves 4 can be smaller than the number of nozzles 3.

In this way, the installation range of the nozzle 3 is narrowed, the stage provided on the low temperature liquefied gas storage tank 1 is also reduced, the labor of construction work such as welding is reduced, and the cost can be reduced.

The nozzle penetrating device for the roof in the low temperature liquefied gas storage tank of the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the gist of the present invention. Of course.

[0021]

According to the present invention, since a plurality of nozzles are arranged in the sleeve, the number of sleeves is smaller than the number of nozzles, and the installation range of the nozzles is narrowed so that the low temperature liquefied gas storage tank can be installed. There is an effect that the stage provided above is also small, the time and effort for the construction work such as welding are reduced, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a vertical sectional view showing a schematic structure of a low temperature liquefied gas storage tank.

FIG. 4 is an enlarged vertical sectional view showing an example of a roof nozzle penetration device in a conventional low temperature liquefied gas storage tank.

5 is a view taken along the line VV of FIG.

[Explanation of symbols]

 1 Low temperature liquefied gas storage tank 2 Roof 3 Nozzle 4 Sleeve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Oomori Direct land 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toyosu General Office

Claims (1)

[Claims] 1. A sleeve is provided so as to vertically penetrate a roof of a low temperature liquefied gas storage tank, and a plurality of nozzles extending from the inside of the low temperature liquefied gas storage tank to the outside are provided in the sleeve. Nozzle penetration device for roof in low temperature liquefied gas storage tank.