JP2007211835A - Low temperature liquefied gas storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To substantially uniformly introduce low temperature liquefied gas into a plurality of inner tanks, when introducing the low temperature liquefied gas into the respective inner tanks by separating the gas from a low temperature liquefied gas supply source, in a low temperature liquefied gas storage tank for storing the plurality of inner tanks in one outer tank. <P>SOLUTION: This low temperature liquefied gas storage tank 10 stores the plurality of inner tanks 15A to 15C in one outer tank 14 for storing the low temperature liquefied gas, and has annular header pipes 17 and 20 forming an annular shape, low temperature liquefied gas introducing branch pipes 18A to 18C and 21A to 21C respectively arranged to the plurality of inner tanks 15A to 15C and connecting the respective inner tanks 15A to 15C to the annular header pipes 17 and 20, and low temperature liquefied gas introducing main pipes 19 and 22 for connecting the annular header pipes 17 and 20 to the low temperature liquefied gas supply source. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a low-temperature liquefied gas storage tank having a structure in which a plurality of inner tanks for storing low-temperature liquefied gases such as LNG (liquefied natural gas) and LPG (liquefied propane gas) are accommodated in one outer tank. It is.

  Conventionally, a low-temperature liquefied gas storage tank having a structure in which a plurality of inner tanks are accommodated in one outer tank is known, and this will be described with reference to FIG. FIG. 4 is a configuration explanatory view schematically showing the configuration of a conventional low-temperature liquefied gas storage tank. In addition, this kind of low temperature liquefied gas storage tank is what was shown by Unexamined-Japanese-Patent No. 2005-106127, for example.

  A conventional low-temperature liquefied gas storage tank 100 will be described. In FIG. 4, reference numeral 11 denotes a foundation, and an outer tub 14 in which an inverted dish-like ceiling portion 14 a is attached to a cylindrical body by welding is fixed on an annular mounting plate 13 fixed on the foundation 11. Has been. In this outer tank 14, a plurality of inner tanks for introducing and storing a low-temperature liquefied gas, in this example, three inner tanks 15A, 15B, 15C are accommodated. Each of the inner tanks 15A to 15C is formed by welding an inverted dish-shaped top and a dish-shaped bottom to a cylindrical body, and is supported and fixed in an upright position on the foundation 11 by leg members (not shown). Yes.

  Then, in order to configure a top-side low-temperature liquefied gas introduction line for dividing and introducing the low-temperature liquefied gas from the low-temperature liquefied gas supply source into the inner tanks 15A to 15C from the top of the inner tank, a non-loop is formed. A ring-shaped top-side non-annular header pipe 117 is provided for each of the inner tanks 15A to 15C and communicates with the top in each of the inner tanks A15 to 15C and the top-side non-annular header pipe 117. The top-side low-temperature liquefied gas introduction branch pipes 18A to 18C, the top-side non-circular header pipe 117, and the top-side low-temperature liquefied gas introduction main pipe 19 that communicate with the low-temperature liquefied gas supply source are provided.

  The tip side of the cryogenic liquefied gas introduction branch pipe 18A for the top side is inserted into the top of the inner tank 15A, and the spray ring is formed by forming a tube having a number of discharge ports in an annular shape at the top of the inner tank 15A. 16 is connected. The same applies to the other low-temperature liquefied gas introduction branch pipes 18B and 18C. The top-side non-annular header pipe 117 is connected to one end of the top-side low-temperature liquefied gas introduction main pipe 19 that is drawn out of the storage tank through the pipe insertion hole of the outer tank 14. The low temperature liquefied gas introduction main pipe 19 for the top side is provided with a flow rate control valve 19a at the other end, and is connected to a low temperature liquefied gas receiving line 51 to which a low temperature liquefied gas from a low temperature liquefied gas supply source is supplied. The gap of the pipe insertion hole through which the top-side low-temperature liquefied gas introduction main pipe 19T is inserted is hermetically sealed.

  Further, in order to configure a low-temperature liquefied gas introduction line for the bottom side, which splits the low-temperature liquefied gas from the low-temperature liquefied gas supply source and introduces it into the inner tanks 15A to 15C from the bottom of the inner tank. An annular non-circular header pipe 120 for the bottom side is provided for each of the inner tanks 15A to 15C, and the bottom of each of the inner tanks 15A to 15C is connected to the non-annular header pipe 120 for the bottom side. The bottom-side low-temperature liquefied gas introduction branch pipes 21A to 21C, and the bottom-side low-temperature liquefied gas introduction main pipe 22 that connect the bottom-side non-annular header pipe 120 and the low-temperature liquefied gas supply source are provided. . The bottom-side non-annular header pipe 20 is connected to one end of the bottom-side low-temperature liquefied gas introduction main pipe 22 drawn out of the storage tank through the pipe insertion hole of the outer tank 14. The low temperature liquefied gas introduction main pipe 22 for the bottom side is provided with a flow rate control valve 22a at the other end, and is connected to a low temperature liquefied gas receiving line 51 to which a low temperature liquefied gas from a low temperature liquefied gas supply source is supplied.

  Further, in order to configure a low temperature liquefied gas lead-out line for leading out and discharging the low temperature liquefied gas from the inner tanks 15A to 15C, each of the inner tanks 15A to 15C has a non-annular header pipe 23 and an inner tank 15A to 15C. The low-temperature liquefied gas outlet branch pipes 24A to 24C, which are provided to communicate between the bottoms of the inner tanks 15A to 15C and the non-annular header pipe 23, and communicate with the non-annular header pipe 23 and the consumption equipment. For this purpose, a low-temperature liquefied gas lead-out main pipe 25 is provided. The non-annular header pipe 22 is connected to one end of the low-temperature liquefied gas lead-out main pipe 25 drawn out of the storage tank through the pipe insertion hole of the outer tank 14. The low-temperature liquefied gas lead-out main pipe 25 is connected to a low-temperature liquefied gas discharge line 52 which is provided with a flow rate control valve 25a at the other end and communicates with the low-temperature liquefied gas consumption facility. Note that the gap between the pipe insertion holes through which the low-temperature liquefied gas outlet main pipe 25 is inserted is hermetically sealed.

  Further, in order to configure an inner tank gas phase pressure adjusting line for adjusting the gas phase pressure in the inner tanks 15A to 15C, each of the non-annular non-annular header pipe 26 and each of the inner tanks 15A to 15C is provided. Gas leading / introducing branch pipes 27A to 27C, which communicate with the top of each of the inner tanks 15A to 15C and the non-annular header pipe 26, and the non-annular header pipe 26 and gas pressure adjusting equipment. A gas lead-in main pipe 28 for communication is provided. The gas lead-out introduction main pipe 28 is provided with a flow rate control valve 28a at the other end, and is connected to a gas pressure adjustment line 53 communicating with the gas pressure adjustment facility.

  Thus, the inner tanks 15A to 15C are accommodated in the outer tank 14, and the above-described top-side low-temperature liquefied gas introduction line, bottom-side low-temperature liquefied gas introduction line, low-temperature liquefied gas lead-out line, and inner tank Each piping which comprises a gaseous-phase part pressure adjustment line is provided, Furthermore, between the outer tank 14 and the inner tanks 15A-15C, the powder pearlite which is not shown in figure as a heat insulating material is filled, and heat insulation space is formed. Yes.

  In the low-temperature liquefied gas storage tank configured as described above, when introducing and storing the low-temperature liquefied gas in the inner tanks 15A to 15C, the inner tanks 15A to 15C are newly installed and the cool-down is performed to cool the inner tanks 15A to 15C. Sometimes, the low-temperature liquefied gas from the low-temperature liquefied gas supply source is divided by the top-side low-temperature liquefied gas introduction line and introduced into the inner tanks 15A to 15C. During normal operation after cool-down, the bottom-side low-temperature liquefied gas introduction line or the bottom-side low-temperature liquefied gas introduction line (for example, sharing 90% of the filling amount) and the top-side low-temperature liquefied gas introduction line. By simultaneously using a liquefied gas introduction line (for example, sharing 10% of the filling amount), the low temperature liquefied gas is introduced into the inner tanks 15A to 15C.

  However, the low-temperature liquefied gas is in a gas-liquid two-phase flow depending on the temperature and pressure conditions, (1) at cool-down, (2) at the initial stage when the low-temperature liquefied gas is introduced in normal operation, and (3) in normal operation. At the end of the introduction of the low-temperature liquefied gas, a phenomenon in which the low-temperature liquefied gas is in a gas-liquid two-phase flow and flows through the piping in the outer tank 14 is likely to occur. When the low-temperature liquefied gas flows through the pipe as a gas-liquid two-phase flow, the flow of the low-temperature liquefied gas is very unstable and the pressure loss in the pipe fluctuates greatly, so that the inner tanks 15A to 15C It becomes difficult to introduce the low-temperature liquefied gas almost uniformly.

  FIG. 5 is an explanatory diagram of the case where the low-temperature liquefied gas flows through the piping when the three inner tanks are cooled down in FIG. 4.

In the case where the top-side low-temperature liquefied gas introduction line has a tournament-type pipe connection structure with a non-annular header pipe 117, it is originally inferior in even distribution. For this reason, when the low-temperature liquefied gas is introduced into the gas-liquid two-phase flow state when the low-temperature liquefied gas is first introduced at the time of the cool-down of the inner tanks 15A to 15C, As shown, the low temperature liquefied gas does not flow evenly between (b) and [(c) + (d)] in the non-annular header pipe 117, and (b) is more likely to be (c) and (d). In the case where the flow is larger than that, the top-side low-temperature liquefied gas introduction branch pipe 18A cools faster than the other top-side low-temperature liquefied gas introduction branch pipes 18B and 18C, thereby the top-side low-temperature liquefaction liquefaction for the inner tank 15A. The gas introduction branch pipe 18 </ b> A is further cooled because the low-temperature liquefied gas easily flows. As a result, the cooling rates of the inner tanks 15A to 15C cannot be kept substantially equal, and a large temperature difference occurs between the inner tank 15A and the inner tanks 15B and 15C, and thermal stress in the low-temperature liquefied gas storage tank is concentrated. There is a risk of damage to components (such as the nozzle at the tip of the pipe) that are easily damaged. It is difficult to predict in advance the behavior of the gas-liquid two-phase flow generated by the low-temperature liquefied gas. In addition, regarding the above-described low-temperature liquefied gas introduction line for the bottom side, which introduces the low-temperature liquefied gas from the bottom into the inner tanks 15A to 15C, the inner tanks 15A to 15C are obtained by the low-temperature liquefied gas being in a gas-liquid two-phase flow state. The low temperature liquefied gas cannot be introduced almost uniformly.
Japanese Patent Laying-Open No. 2005-106127 (FIG. 3)

  Accordingly, an object of the present invention is to provide a low-temperature liquefied gas storage tank in which a plurality of inner tanks are accommodated in one outer tank, and when a low-temperature liquefied gas from a low-temperature liquefied gas supply source is divided and introduced into each of the inner tanks. Another object of the present invention is to provide a low-temperature liquefied gas storage tank in which the low-temperature liquefied gas can be introduced almost uniformly into the plurality of inner tanks.

  In order to solve the above problems, the present invention takes the following technical means.

  The invention of claim 1 is a low-temperature liquefied gas storage tank in which a plurality of inner tanks for storing a low-temperature liquefied gas are accommodated in one outer tank, and an annular header pipe having an annular shape, and the plurality of inner tanks A low-temperature liquefied gas introduction branch pipe which is provided for each and communicates the inner tank and the annular header pipe, and a low-temperature liquefied gas introduction main pipe which communicates the annular header pipe and a low-temperature liquefied gas supply source. A low-temperature liquefied gas storage tank.

  The invention of claim 2 is the low-temperature liquefied gas storage tank according to claim 1, comprising as the annular header pipe, a top-side annular header pipe and a bottom-side annular header pipe, and as the low-temperature liquefied gas introduction branch pipe, The top side cryogenic liquefied gas introduction branch pipe connecting the top part in each inner tank and the top side annular header pipe, and the bottom side connecting the bottom part and bottom side annular header pipe in each inner tank A low-temperature liquefied gas introduction branch pipe for the top side, the low-temperature liquefied gas introduction main pipe for connecting the top-side annular header pipe and the low-temperature liquefied gas supply source, and the bottom-side side A low-temperature liquefied gas introduction main pipe for the bottom side that communicates the annular header pipe and the low-temperature liquefied gas supply source is provided.

  The invention of claim 3 is a low-temperature liquefied gas storage tank comprising a plurality of inner tank groups consisting of a plurality of inner tanks for storing a low-temperature liquefied gas, wherein the plurality of inner tank groups are accommodated in one outer tank. An annular header pipe having an annular shape for each of the plurality of inner tank groups, and each of the inner tanks and the annular header pipe provided for each of the plurality of inner tanks constituting the inner tank group. A low-temperature liquefied gas storage tank comprising: a low-temperature liquefied gas introduction branch pipe that communicates with the annular header pipe and a low-temperature liquefied gas introduction main pipe that communicates with a low-temperature liquefied gas supply source.

  According to a fourth aspect of the present invention, in the low-temperature liquefied gas storage tank according to the third aspect, the annular header pipe includes a top-side annular header pipe and a bottom-side annular header pipe, and the low-temperature liquefied gas introduction branch pipe, The top side cryogenic liquefied gas introduction branch pipe connecting the top part in each inner tank and the top side annular header pipe, and the bottom side connecting the bottom part and bottom side annular header pipe in each inner tank A low-temperature liquefied gas introduction branch pipe for the top side, the low-temperature liquefied gas introduction main pipe for connecting the top-side annular header pipe and the low-temperature liquefied gas supply source, and the bottom-side side A low-temperature liquefied gas introduction main pipe for the bottom side that communicates the annular header pipe and the low-temperature liquefied gas supply source is provided.

  The low-temperature liquefied gas storage tank of the present invention has a line for dividing a low-temperature liquefied gas from a low-temperature liquefied gas supply source into a plurality of inner tanks, an annular header pipe having an annular shape, and each of the plurality of inner tanks. A low-temperature liquefied gas introduction branch pipe that is provided and communicates between the inner tank and the annular header pipe, and a low-temperature liquefied gas introduction main pipe that communicates between the annular header pipe and the low-temperature liquefied gas supply source. In this way, unlike the conventional type having a tournament type pipe connection structure with a non-annular header pipe that does not form a loop, it has an annular type pipe connection structure with an annular header pipe. Therefore, it is excellent in the uniform distribution of low-temperature liquefied gas to multiple inner tanks, and even if the phenomenon that the low-temperature liquefied gas is in a gas-liquid two-phase flow occurs, the deterioration of the uniform distribution due to the pressure loss fluctuation is minimized. Therefore, the low-temperature liquefied gas can be introduced almost uniformly into the plurality of inner tanks, and the risk of damage due to the thermal stress of the constituent members in the low-temperature liquefied gas storage tank can be eliminated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration explanatory view schematically showing the configuration of the low-temperature liquefied gas storage tank according to the first embodiment of the present invention. Here, the difference from the low-temperature liquefied gas storage tank 100 shown in FIG. 4 is that the annular header pipes 17 and 20 are provided, and the other configurations are the same. Therefore, the low-temperature liquefied gas storage tank shown in FIG. The same reference numerals as those in FIG. 4 are attached to the same components as those in FIG.

As shown in FIG. 1, the low-temperature liquefied gas storage tank 10 of the first embodiment includes a top-side annular header pipe 17 that is annular unlike the conventional one. Thereby, the low-temperature liquefied gas storage tank 10 divides the low-temperature liquefied gas from the low-temperature liquefied gas supply source and introduces the low-temperature liquefied gas introduction line for the top side into the inner tanks 15A to 15C from the top of the inner tank. The top side annular header pipe 17, the top side low temperature liquefied gas introduction branch pipes 18 </ b> A to 18 </ b> C connecting the inner tanks 15 </ b> A to 15 </ b> C and the top side annular header pipe 17, and the top side annular header pipe 17 and low temperature liquefaction. A top-side low-temperature liquefied gas introduction main pipe 19 that communicates with a gas supply source is used.

Further, the low-temperature liquefied gas storage tank 10 includes a bottom-side annular header pipe 20 that is annular, unlike the conventional one. As a result, the low-temperature liquefied gas storage tank 10 divides the low-temperature liquefied gas from the low-temperature liquefied gas supply source, introduces the low-temperature liquefied gas introduction line for receiving from the bottom of the inner tank into the inner tanks 15A to 15C. Bottom-side annular header pipe 20, bottom tank-side low temperature liquefied gas introduction branch pipes 21A to 21C connecting inner tanks 15A to 15C and bottom-side annular header pipe 20, bottom-side annular header pipe 20 and low-temperature liquefaction The bottom-side low-temperature liquefied gas introduction main pipe 22 communicates with the gas supply source.

As described above, the low-temperature liquefied gas storage tank 10 is different from the conventional one having the tournament-type pipe coupling structure with the non-annular header pipes 117 and 120 that do not form a loop, and the annular type with the annular header pipes 17 and 20. It has a pipe connection structure.

Therefore, the connection points a to c and a 'to c' (see FIG. 2) between the low temperature liquefied gas introduction branch pipes 18A to 18C and 21A to 21C communicating with the inner tanks 15A to 15C and the annular header pipes 17 and 20 are almost the same. Even if the low pressure liquefied gas storage tank 10 is excellent in the uniform distribution of the low temperature liquefied gas to the inner tanks 15A to 15C and the low temperature liquefied gas becomes a gas-liquid two-phase flow state, the pressure loss occurs. It is possible to introduce the low temperature liquefied gas into the inner tanks 15 </ b> A to 15 </ b> C almost evenly while minimizing the deterioration of the uniform distribution due to the fluctuation. Therefore, the possibility of damage due to thermal stress of the constituent members in the low temperature liquefied gas storage tank 10 caused by the temperature difference between the inner tanks 15A to 15C due to uneven distribution of the low temperature liquefied gas can be eliminated.

FIG. 3 is an explanatory diagram schematically showing the configuration of the low-temperature liquefied gas storage tank according to the second embodiment of the present invention. Here, the difference from the low-temperature liquefied gas storage tank 10 of FIG. 1 is that a plurality of inner tank groups including a plurality of inner tanks are provided (the low-temperature liquefied gas storage tank 10 is constituted by inner tanks 15A to 15C. Since the other configuration is the same, the components common to the cryogenic liquefied gas storage tank 10 shown in FIG. 1 are given the same reference numerals as in FIG.

In FIG. 3, 11 'is a foundation, 13' is a mounting plate, and 14 'is an outer tub having a ceiling portion 14a'. As shown in FIG. 3, the low-temperature liquefied gas storage tank 10 'according to the second embodiment includes a plurality of inner tank groups, in this example, two inner tank groups, and one of the inner tanks 15A to 15C. The tank group and its piping, and the other inner tank group consisting of the inner tanks 15 </ b> A ′ to 15 </ b> C ′ and its piping are accommodated in one outer tank 14.

As shown in FIG. 3, the inner tanks 15A 'to 15C' constituting the other inner tank group and their pipes (the top side annular header pipe 17 ', the top side low temperature liquefied gas introduction branch pipes 18A' to 18C ', Low temperature liquefied gas introduction main pipe 19 'for the top side, annular header pipe 20' for the bottom side, low temperature liquefied gas introduction branch pipes 21A 'to 21C' for the bottom side, low temperature liquefied gas introduction main pipe 22 'for the bottom side, non-annular header Tube 23 ', low temperature liquefied gas outlet branch pipes 24A' to 24C ', low temperature liquefied gas outlet main pipe 25', non-annular header pipe 26 ', gas outlet introducing branch pipes 27A' to 27C 'and gas outlet introducing main pipe 28') Is the same configuration as the inner tanks 15A to 15C constituting one inner tank group and its piping as described in FIG.

Thus, the low-temperature liquefied gas storage tank 10 ′ has the same storage capacity as one inner tank group composed of the inner tanks 15 </ b> A to 15 </ b> C in one outer tank 14, and the one inner tank group, The other inner tank group composed of the inner tanks 15A ′ to 15C ′ is accommodated. In this low-temperature liquefied gas storage tank 10 ', both the inner tank groups are initially filled with the low-temperature liquefied gas, and one of the inner tank groups is used for dispensing. When the amount is reduced to a predetermined amount, the other inner tank group is used for dispensing. When the storage amount of the other inner tank group is decreased to a predetermined amount, one inner tank group filled in the meantime is used for dispensing. It is used by switching alternately.

And according to the low-temperature liquefied gas storage tank 10 'configured in this way, each of the plurality of inner tank groups is provided with an annular type pipe coupling structure by the annular header pipes 17, 20 and 17', 20 '. The low temperature liquefied gas can be introduced almost uniformly into the inner tanks 15A to 15C for one inner tank group, and the low temperature liquefied gas can be introduced almost equally to the inner tanks 15A 'to 15C' for the other inner tank group. can do.

It is a configuration explanatory view schematically showing the configuration of the low-temperature liquefied gas storage tank according to the first embodiment of the present invention. It is explanatory drawing which shows the principal part of the low-temperature liquefied gas storage tank of FIG. It is composition explanatory drawing which shows typically the structure of the low-temperature liquefied gas storage tank by 2nd Embodiment of this invention. It is structure explanatory drawing which shows the structure of the conventional low-temperature liquefied gas storage tank typically. It is explanatory drawing about the case where a low-temperature liquefied gas flows through piping at the time of the cool-down of three inner tanks in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10 '... Low temperature liquefied gas storage tank 11, 11' ... Base 13, 13 '... Mounting plate 14, 14' ... Outer tank 14a, 14a '... Ceiling part 15A-15C, 15A'-15C' ... Inner tank 16 , 16 '... spray ring 17, 17' ... top side annular header pipe 18A-18C, 18A'-18C '... top side low temperature liquefied gas introduction branch pipe 19, 19' ... top side low temperature liquefied gas introduction main pipe 19a , 19a '... flow control valve 20, 20' ... bottom side annular header pipe 21A-21C, 21A'-21C '... bottom side low temperature liquefied gas introduction branch pipe 22, 22' ... bottom side low temperature liquefied gas introduction main pipe 22a, 22a '... flow control valve 23, 23' ... non-annular header pipe 24A-24C, 24A'-24C '... low temperature liquefied gas outlet branch pipe 25, 25' ... low temperature liquefied gas outlet main pipe 25a, 25a ... Flow control valves 26, 26 '... Non-circular header pipes 27A to 27C, 27A' to 27C '... Gas lead-in / out branch pipes 28,28' ... Gas lead-in / out main pipes 28a, 28a '... Flow control valves 51, 51' ... Low-temperature liquefied gas acceptance line 52,52 '... Low-temperature liquefied gas discharge line 53,53' ... Gas pressure adjustment line

Claims (4)

  In the low-temperature liquefied gas storage tank in which a plurality of inner tanks for storing the low-temperature liquefied gas are accommodated in one outer tank, an annular header pipe having an annular shape is provided for each of the plurality of inner tanks. A low temperature liquefied gas introduction branch pipe connecting each inner tank and the annular header pipe, and a low temperature liquefied gas introduction main pipe connecting the annular header pipe and a low temperature liquefied gas supply source are provided. Liquefied gas storage tank.   As the annular header pipe, a top-side annular header pipe and a bottom-side annular header pipe are provided, and as the low-temperature liquefied gas introduction branch pipe, the top in each inner tank and the top-side annular header pipe are connected. A low-temperature liquefied gas introduction branch for the top side, and a low-temperature liquefied gas introduction branch for the bottom side connecting the bottom and the bottom-side annular header pipe in each of the inner tanks, as the low-temperature liquefied gas introduction main pipe The bottom side low temperature liquefied gas introduction main pipe connecting the top side annular header pipe and the low temperature liquefied gas supply source, and the bottom side low temperature liquefied gas connecting the bottom side annular header pipe and the low temperature liquefied gas supply source The low-temperature liquefied gas storage tank according to claim 1, further comprising a gas introduction main pipe.   In the low-temperature liquefied gas storage tank provided with a plurality of inner tank groups consisting of a plurality of inner tanks for storing the low-temperature liquefied gas, the plurality of inner tank groups are accommodated in one outer tank, the plurality of inner tank groups An annular header pipe having an annular shape and a low-temperature liquefied gas introduction branch that is provided for each of the plurality of inner tanks constituting the inner tank group and communicates with each inner tank and the annular header pipe. A low-temperature liquefied gas storage tank comprising a pipe, and a low-temperature liquefied gas introduction main pipe connecting the annular header pipe and a low-temperature liquefied gas supply source.   As the annular header pipe, a top-side annular header pipe and a bottom-side annular header pipe are provided, and as the low-temperature liquefied gas introduction branch pipe, the top in each inner tank and the top-side annular header pipe are connected. A low-temperature liquefied gas introduction branch for the top side, and a low-temperature liquefied gas introduction branch for the bottom side connecting the bottom and the bottom-side annular header pipe in each of the inner tanks, as the low-temperature liquefied gas introduction main pipe The bottom side low temperature liquefied gas introduction main pipe connecting the top side annular header pipe and the low temperature liquefied gas supply source, and the bottom side low temperature liquefied gas connecting the bottom side annular header pipe and the low temperature liquefied gas supply source The low-temperature liquefied gas storage tank according to claim 3, further comprising a gas introduction main pipe.

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