JPS5817199Y2 - Tank for cryogenic liquid storage - Google Patents

Description

[Detailed description of the invention] The present invention proposes a low-temperature liquid storage tank that has excellent airtightness and allows easy confirmation of membrane deformation.
An example of this will be described below based on FIG. 1.

1 is a concrete body, 2 is a cold insulating material attached to its inner surface, and 3 is a membrane disposed further inside to be able to be thermally deformed, and these components constitute a retank body 4.

Reference numeral 5 denotes a side plate erected from the concrete body 1, and a roof plate 7 is attached to the upper end of the side plate via a pair of upper and lower connecting plates 6A and 6B.

Reference numeral 8 indicates a cold insulating material attached to the inner surface extending from the side plate 5 to the roof 7.

9 is a manhole formed from the side plate 5 to the cold insulation material 8;
Reference numeral 10 indicates a urethane foam filling the manhole 9, and reference numeral 11 indicates a manhole cover.

Reference numeral 12 denotes a seal plate disposed between the connecting plate 6B (roof) and the membrane 3, and is constructed by connecting a plurality of curved thin metal plates 13A, 13B, and 13C (three in the example). be done.

That is, the adjacent ends of the metal thin plates 13A, 13B, and 13C are connected by resistance seam welding 14, and the lower end of the lower metal thin plate 13C is connected to the reinforcing ring 15 attached to the membrane 3. , the upper end of the upper metal thin plate 13A is connected to the connecting plate 6B.

Due to the presence of this seal plate 12, the low temperature liquid 1 in the tank chamber
The space above 6 is divided into a gas layer 17 and a cold insulating layer 18, and the adjacent end side where resistance seam welding 14 is applied protrudes toward the gas layer 17 side.

1cJ is a holding device that prevents the seal plate 12 from being deformed by more than a certain amount, and is connected to the roof plate 7.

In other words, the holding device 19 is attached to the support beam 20 which is vertically suspended from the roof plate 7, penetrates the cold insulation material 8, and is located in the gas layer 17, and the adjacent ends of the thin metal plates 13A, 13B, and 13C. Brackets 21A and 21 are attached to the support beam 20 so that the upper and lower pairs face each other.
B, 22 A, 22 B, and each set of brackets 21 A
, 21 A, 22 A, and 22 B, and vertical rods 23 and 24 that are fitted onto these rods 23 and 24 through through holes 25 and 26 and connected to adjacent ends by plasma welding 27. It consists of a movable plate 28 and 29,
The vertical movement A of both rotating plates 28 and 29 is the bracket) 21A.

21 B, 22 A, and 22 B, and the lateral movement B is allowed within the diameter range of the through holes 25, 26, deformation of the seal plate 12 beyond a certain amount is prevented.

Reference numeral 30 denotes a membrane suspension device that allows thermal deformation of the membrane 3 while also retaining its own weight, and is disposed from the outside of the seal plate 12 to the outside of the tank.

That is, the membrane hanging device 30 includes a connecting plate 6A,
6B, a guide tube 31 that penetrates through the roof plate 7 and the cold insulation material 8 and opens into the cold insulation layer 18, a rod 32 that is inserted through the guide tube 31 and is movable up and down, and the lower end of the rod 32 and the reinforcement. A link 33 connecting the ring 15, a swinging rod 35 attached to the bracket 34 from the connecting plate 6A for seesaw movement, and a metal fitting 36 connecting one end of the swinging rod 35 and the upper end of the rod 32. , a bellows 37 provided between the metal fitting 36 and the guide tube 31, a movement position regulating device 38, a weight 39 attached to the other end of the swinging rod 35, and a deflection for regulating the lateral deflection of the weight 39. It consists of a stopper 40 and a stopper 41 that regulates the lower limit of the weight 39, and the exposed portions outside the tank are disposed inside a protective cover 42 attached to the connecting plate 6A. A sight glass 43 with a scale that displays the amount of elevation is attached.

According to the cryogenic liquid storage tank with the above configuration, weight 3
The membrane 3 is lifted by the load 9 through the rod 32 and the link 33. Therefore, the amount of thermal contraction due to hanging the membrane is determined by the fact that the weight 39 rises in accordance with the contraction, which can be observed through the sight glass 43. This can be confirmed by

Further, accidents such as cutting of the membrane hanging device 30 can be discovered in the same manner.

Furthermore, since the membrane hanging device 30 is arranged outside the gas layer 17 due to the division of the seal plate 12, there is no fear of gas leakage, and there is no possibility that the N2 gas from the cold insulation layer 18 will leak from the guide pipe 31. However, this can be prevented by the bellows 37.

When storing heat in the membrane 3, the sealing plate 12 can absorb the heat by deforming each thin metal plate 13A, 13B, 13C, and the amount of heat absorbed can be increased by increasing the number of thin metal plates. This deformation of the seal plate 12 is caused by the sloshing pressure of the low-temperature liquid 16 during earthquakes, the pressure difference between both layers 1-7, 18, etc., but this is because the holding device 19 Seal plate 1
2. It can be withstood by preventing deformation of more than a certain amount.

Note that when manufacturing and attaching the seal plate 12, resistance seam welding 14 and plasma welding 27 are used in combination, so that a highly airtight state can be achieved.

In addition, since the welding area protrudes, highly reliable automatic welding can be performed on-site, and leak testing after welding can be easily performed.

The thin metal plates 13A, 13B, and 13C are simply curved, resulting in a smooth forming process.
There are fewer wrinkles and distortions during molding, and processing efficiency is increased.

FIG. 2 shows another embodiment in which the membrane suspension device 30 has a different shape and type.

That is, the guide tube 31 passes through the side plate 5 and the cold insulating material 8 and is disposed laterally.

The wire 44 inserted through the guide tube 31 and connected to the metal fitting 36 is hung from a pulley 46 attached to a bracket 45 connected from the side plate 5 into the non-gas layer 18, and then attached to the link 33. are combined.

Further, a pulley 48 is disposed within the protective cover 42 via a bracket 47, and one end of a wire 49 hung on the pulley 48 is connected to the metal fitting 36, and the other end is connected to the weight 39, respectively.

Note that the membrane suspension device 30 may adopt a hydraulic cylinder type instead of the type using the weight 39 as shown in both embodiments.

Further, in the embodiment, the holding device 19 is disposed within the gas layer 17, but it may be disposed within the cold insulation layer 18 with the direction of curvature of the seal plate 12 being reversed.

According to the low-temperature liquid storage tank of the present invention described above, a seal plate composed of a plurality of curved thin metal plates connected together is disposed between the roof and the membrane, and the seal plate Since a holding device for preventing the deformation of the roof is provided in a continuous manner from the roof, the following effects can be expected.

Thermal deformation (thermal contraction) of the membrane can be absorbed by the deformation of the sealing plate to ensure gas sealing at all times, and by increasing the number of thin metal plates, more of the amount of thermal contraction of the membrane can be absorbed.

○ The seal plate is greatly deformed and tends to break due to the sloshing pressure of low-temperature liquid and the pressure inside and outside the seal plate during earthquakes, etc., but this deformation is prevented by the holding device and it can withstand the aforementioned pressure sufficiently. d ○ Since a thin metal plate is formed into a simple curve, there are few wrinkles or distortions during forming, and processing can be performed smoothly and efficiently.

○ When manufacturing and installing a seal plate by welding thin metal plates, the welding area protrudes, making automatic welding possible on-site and highly reliable, and it is easy to perform a gluing test after welding.

Further, according to the present invention, the membrane hanging devices that allow thermal deformation of the membrane are arranged mutually outside the tank from the outside of the seal plate, so the following effects can be expected.

○ The gas in the tank is prevented from migrating to the hanging device side by the seal plate, so there is no gas leakage through the installation components of the hanging device.

○ The exposed part of the hanging device outside the tank allows the amount of heat shrinkage of the membrane to be observed at all times, and it also makes it easier to detect accidents such as wire cutting.

It is also easy to maintain.

Incidentally, as shown in the embodiment, when a counterweight system is adopted as the suspension device, accidents occurring during an earthquake can be reduced.

Furthermore, by employing the bellows, leakage of N2 gas from the cold insulation layer can be prevented.

[Brief explanation of drawings]

FIGS. 1 and 2 are longitudinal sectional views of essential parts showing embodiments of the present invention, respectively. 3r... Membrane, 4... Tank body, 5... Side plate, 7... Roof plate, 12.
... Seal plate, 13 A, 13 B, 13 C.
...Metallic thin plate, 14...Resistance seam welding, 17...Gas layer, 18...Cold insulation layer, 19...Holding device, 27... Plasma welding, 30... Membrane hanging device, 37.
...Bellows, 39' ...Weight, 4
3...Side glass.

Claims (1)

[Scope of utility model registration request] A sealing plate made up of a plurality of curved thin metal plates connected together is arranged between the roof membrane, and a holding device is installed from the roof to prevent the sealing plate from being deformed beyond a certain amount. 1. A tank for storing low-temperature liquids, characterized in that a membrane hanging device that is connected in series and that allows thermal deformation of the membrane is disposed outside of the sealing plate and extending to the outside of the tank.