JP2000238573A - Tank lorry for liquid transportation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always enable measurement of the total weight of a stored liquid so as to enable instantaneous confirmation of the liquid amount transported and supplied to a customer, by mounting a storage vessel on an automobile main body via a weight measurement device in a tank lorry for liquid transportation. SOLUTION: A plurality of weight measurement devices 4... are provided on chassises 3 of a transporting automobile main body 2 in a tank lorry 1 for liquid transportation, and a substantially cylindrical storage vessel 5 is mounted and fixed via the weight measurement devices 4. As the weight measurement devices 4, a plurality of, for example, 3 each and total 6 pieces of load cells are installed on the right and left chassises 3, respectively. A sub frame with the bottom part of an outer vessel 5a of the storage vessel 5 welded and fixed along the longitudinal direction is placed thereon for fixing the storage vessel 5. Accordingly, the total weight of the liquid stored in the storage vessel 5 can always be measured so that the liquid amount can be confirmed instantaneously at the time of transporting and supplying a liquid to a customer without the need of going to a measurement station installed separately and distantly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tanker truck for transporting liquid, which transports a liquid containing a low-temperature liquefied gas and fills it into a storage tank where it is used.

[0002]

2. Description of the Related Art In general, when liquids such as liquid fuel such as light oil and liquid edible raw materials such as edible oil which is a raw material of food ingredients are delivered to a use destination, a storage tank mounted on a tank truck is filled with these liquids. It is housed, transported and transported. At the time of this transportation, first, these liquid storage bases are filled into tanks mounted on tank trucks,
Next, this is transported to a place of use by operating a tank lorry, and liquid is sent from a tank of the tank lorry to a storage tank of the use destination, and the liquid is transferred to the storage tank of the use destination and supplied.

However, in transporting and supplying such a liquid material to a use destination, it is necessary to measure and check the supplied supply liquid amount (hereinafter referred to as “supply liquid amount”) of the liquid material to the use destination storage tank. is there. Usually, these liquids are measured by using a positive displacement flow meter or by using a glass liquid level meter to convert and measure the liquid level to check the supplied liquid amount. I have.

On the other hand, liquid nitrogen (boiling point at 1 atm.
5.6 ° C), liquid oxygen (boiling point at 1 atm-182.8)
° C), liquid argon (boiling point at 1 atm-185.5 ° C)
In the measurement of the supply amount of the low-temperature liquefied gas having a low-temperature boiling point (e.g., etc.), since the liquefied gas is at a low temperature, the flow meter is maintained at a constant low temperature by using the above-described positive displacement type flow meter. Otherwise, the low-temperature liquefied gas is vaporized, and there is an inconvenience that quantitative measurement cannot be performed. Also, in the measurement using the glass level gauge, since the sample is at a low temperature, the liquid indicating the liquid level freezes and solidifies and cannot be used.

[0005] In view of the above, the measurement of the supply amount of the low-temperature liquefied gas as described above is actually performed by a gravimetric method. In other words, in this method, when the low-temperature liquefied gas transported by the tank truck is sent to the storage tank of the use destination and transferred and filled, before the liquid is sent to the storage tank of the use destination, This is a method in which the weight of a tank truck is measured after the liquid is sent to the storage tank and after the transfer and filling are completed, and the supply liquid amount is measured based on the difference. In order to carry out this weight measuring method, it is necessary to provide a weighing station equipped with a large weighing device for weighing a tank truck at the place where the storage tank is used.

Conventionally, the transportation and supply of the low-temperature liquefied gas is generally carried out through a circulation route as shown in FIG. That is, in order to transport and supply to the customer, first, the tank truck 51 is moved to the low-temperature liquefied gas production plant A, and the low-temperature liquefied gas produced in the plant is stored in the storage tank 52 mounted on the bed of the tank truck 51.
Fill and store. Next, the tank truck 51
Goes to a weighing station B equipped with a weigh scale capable of measuring the weight of the tank truck 51 and measures the total weight including the weight of the vehicle. Next, the tank truck 51 travels to the location of the first customer C, fills and supplies the low-temperature liquefied gas into the storage tank C1 provided therein, returns to the weighing station B again, and returns to the tank truck. Measure the total weight of 51. Then, the difference between the total weight of the low-temperature liquefied gas before and after the supply of the low-temperature liquefied gas to the first customer C is performed as the supply amount of the low-temperature liquefied gas to the first customer C.

When the low-temperature liquefied gas is continuously supplied to the second customer D, if there is a sufficient amount of the low-temperature liquefied gas remaining in the storage tank 52 of the tank lorry 51, it goes directly to the location of the second customer D. Then, after charging and supplying the low-temperature liquefied gas to the storage tank D1 of the customer D, return to the measuring station B, and measure the difference between the total weight before and after the supply of the low-temperature liquefied gas to the customer D in the same manner as described above. With this, trading is performed as the supply amount of the low-temperature liquefied gas to the second customer D. When the amount remaining in the storage tank 52 of the tank truck 51 is not sufficient, the process returns to the low-temperature liquefied gas manufacturing plant A, and the liquid is supplied and supplied to the first customer C in the same manner. The low-temperature liquefied gas is supplied to the second customer D.

[0008]

However, according to the above-mentioned transaction method, it is necessary to calculate the amount of supply liquid to be traded every time the low-temperature liquefied gas is supplied. Therefore, it is necessary to return to the measuring station B for each transaction. Did not. For example, the first customer C
And the second customer D are nearby and the tank truck 51
Although it is possible to transport and supply cryogenic liquefied gas to both customers continuously, it is a different customer. there were. In addition, even if a plurality of storage tanks in the vicinity are the same customer, if each storage tank is used by a different department in charge, it is often processed in a separate accounting, and low-temperature liquefaction The fact is that each time gas is supplied to each storage tank, it returns to the weighing station in order to calculate the amount of supply liquid to be traded. Although a liquid level gauge is provided in the storage tank of the customer, this liquid level gauge is effective as a means for knowing the outline of the residual amount of the low-temperature liquefied gas amount in the storage tank, There is a problem in terms of accuracy when used for trading.

The present invention has been made in view of the above-mentioned disadvantages and problems, and the total weight of the stored liquid to be mounted and transported is:
It is always kept in the state of being measured, enabling instantaneous and accurate measurement. An object of the present invention is to provide a tanker truck for transporting liquid which can accurately measure and measure weight.

[0010]

According to a first aspect of the present invention, there is provided a liquid transportation tank lorry having a storage tank for storing a liquid to be transported to a destination. A tank truck, wherein the storage tank is mounted on a vehicle body via a weight measuring device. According to a second aspect of the present invention, there is provided the liquid transport tank lorry according to the first aspect, wherein a plurality of weight measuring devices are used for mounting the storage tank on a vehicle body. According to a third aspect of the present invention, there is provided the liquid transport tank lorry according to any one of the first and second aspects, wherein the weight measuring device is provided with a calculating means and a printing means. It is. The invention according to claim 4 is the tank truck for transporting liquid according to any one of claims 1 to 3, wherein the storage tank is a storage tank having heat insulation. According to a fifth aspect of the present invention, there is provided the liquid transport tanker truck according to the fourth aspect, wherein the liquid to be transported and supplied is a low-temperature liquefied gas.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The tanker truck for transporting liquid according to the present invention does not directly fix a storage tank for storing liquid to the vehicle body of the transport vehicle, but interposes a weight measuring device on a vehicle such as a chassis. It is fixed and mounted.

The weight of the storage tank is dispersed and supported by using a plurality of weight measuring instruments used for mounting the storage tank on a vehicle body, and the weight is divided and weighed to measure the weight of one weighing instrument. By making the applied load within the possible range a light weight, it is possible to improve the measurement accuracy by making the scale finer. In order to attach the weight measuring device to the vehicle body and the storage tank while interposing them, it is preferable that the weight measuring device be fixed by bolts and nuts so as to be replaceable. In addition, the number of weighing devices that support the storage tank is determined by selecting an appropriate number in consideration of the required measurement accuracy, based on the weight when the liquid is filled and stored in the storage tank at the maximum. I just need.

Each weighing device is connected to the calculating means and arranged and provided with a printing means, so that the weight of the storage tank, which changes every moment, is totaled from each weighing device and immediately calculated to calculate the weighing value. It can be calculated, and the value can be recorded and collected by printing out the value by a printing means as needed. Further, if the data storage / storage means is provided, the supply management can be further improved.

If the storage tank for storing the liquid is a storage tank having heat insulation, it can be suitably used for transporting a heating liquid or a cooling liquid. Further, it can be suitably used for transporting a cryogenic liquid such as a low-temperature liquefied gas, and the supply amount of the seed liquid can be accurately and appropriately measured, thereby enabling fair trade.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a liquid transportation tank truck of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view illustrating an example of a tank truck for transporting liquid of the present invention, and FIG. 2 is a schematic bottom view. 1 and 2
In the tank truck 1 for transporting liquid according to the present invention, a plurality of weight measuring devices 4
4 and so on, and put the storage tank 5 on this,
The storage tank 5 is connected to the chassis 3 via weight measuring devices 4, 4,.
It is fixed above.

When the storage tank 5 stores and transports a liquid that is in a liquid state at normal temperature, the storage tank 5 may be made of, for example, an acid-resistant or alkali-resistant material that can correspond to the characteristics of the liquid. desirable. Further, in the case of storing and transporting a liquid having a boiling point of 0 ° C. or less, such as a low-temperature liquefied gas, it is preferable to use a storage tank appropriately provided with heat insulation. As the heat insulation structure, a stainless steel inner / outer tank has a double wall, and a space formed between the walls of the inner / outer tank is filled with pearlite powder, and the space is evacuated. Then, a storage tank having good heat insulation performance is obtained. Note that this heat insulation structure is merely an example, and the present invention is not limited to this heat insulation structure, and it goes without saying that a storage tank having any generally known heat insulation structure can be used. Although not shown in FIGS. 1 and 2, when the storage tank 5 is filled with a liquid, or when the liquid is supplied from the storage tank 5 to the pipes, valves, and the like used when the liquid is sent from the storage tank 5 to the destination. Of course, in the case of transporting a low-temperature liquefied gas, a pressurizing evaporator or the like for obtaining a pressurizing gas to be used at the time of liquid sending is provided.

The above-mentioned storage tank 5 has a substantially cylindrical shape in appearance, and its longitudinal axis is arranged along the front-rear direction of the transport vehicle main body 2 so that the storage tank 5 can be moved forward and backward. It is fixed to two chassis 3, 3 extending in a horizontal direction on a plane along the direction via a weight measuring device 4. For this reason, in accordance with the separation distance S between the two chassis 3, 3 extending in parallel,
The steel subframes 6, 6 are provided in parallel with each other and fixed to the bottom of the outer tank 5a of the storage tank 5 by welding along the longitudinal direction. A plurality of load cells (six in FIG. 1 for a total of six) are installed on each of the two chassis 3 and 3 as the weight measuring device 4, and the load cells are placed on the bottom of the outer tank 5 a of the storage tank 5. A sub-frame welded and fixed along the longitudinal direction is placed, and a storage tank 5 is arranged on a chassis via a weight measuring device 4 and installed in the liquid transport vehicle main body 2. Then, the outputs from the weight measuring devices 4, 4,... Are input to arithmetic means (not shown) and calculated, so that a change in weight of the mounted storage tank 5 can be immediately confirmed. Further, printing means (not shown) is provided on the arithmetic means (not shown).
If the equipment is provided, the weight fluctuation of the storage tank 5 can be appropriately recorded and collected.

In the above, an example is described in which the weight measuring device 4 is installed on the chassis 3 of the transport vehicle body 2, the sub-frame 6 is mounted thereon, and the storage tank 5 fixed thereto is arranged on the chassis. did. In this case, the arrangement height of the storage tank 5 is increased by the height dimension of the weight measuring device 4, and there is a slight problem in that the stability of the transport vehicle body is lacking. For this reason, as shown in FIGS. 3 and 4, the weight measuring device 4 is mounted on the outer side surface 3a of the chassis 3 and fixed on the bottom of the outer tank 5a of the storage tank 5 on the upper surface thereof. To place storage tank 5
Is supported on the chassis 3 via the weight measuring device 4 and installed on the transport vehicle body so as to keep the height as low as possible. This will be further described with reference to FIGS.

FIG. 3 is a schematic explanatory view of an essential part for explaining an example of a structure in which a storage tank is mounted on a transportation vehicle chassis, and FIG. 4 is FIG.
FIG. 3 and 4, components common to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description is omitted. 3 and 4, the subframe 6 fixed to the bottom of the outer tank 5a of the storage tank 5 along the longitudinal direction thereof is outwardly expanded with the outer end side wall 6b of the bottom surface 6a facing upward. And a receiving portion 6c whose one inner end of the bottom surface 6a projects vertically (L-shaped) upward.
Is formed of a long steel member. A plurality of storage tank fixing support members 7, 7,... Made of a triangular steel plate having one side 7a welded and fixed along the top and bottom of the side wall outer surface 6d are provided on the side wall outer surface 6d. I have.

The sub-frames 6 having such a structure are arranged in the outer tank 5a of the storage tank 5 so as to keep the two parallel along the longitudinal direction, and the side walls 6b of each sub-frame 6
So that the inner surface of the upper end 6e abuts against the side wall of the outer tub 5a,
Further, an end of a receiving portion 6c which is provided at an end of the bottom portion 6a and protrudes upward is arranged so as to contact the bottom of the outer tank 5a.
Then, the upper end 6e of the side wall of the subframe 6 and the end of the bottom receiving portion 6c, which are the contact portions, are connected to the outer tank 5 of the storage tank 5.
The sub-frames 6, 6 are fixed to the outer tank 5a of the storage tank 5 by welding along the longitudinal direction.

On the other hand, on the chassis 3 on which the weight measuring device 4 is installed, on the outer side surface 3a of the chassis 3 located at the place where the weight measuring device 4 is arranged, a steel installation substrate having an inverted L-shaped longitudinal section is provided. 11 suspends the bent upper surface 11a on the upper surface 3b of the chassis 3 and the other side surface 1a.
1b is attached and tightly attached to the outer side surface 3a of the chassis 3 with bolts and nuts 12. In this case, even if the storage tank 5 is supported via the weight measuring device 4 on the receiving table 13 arranged on the installation substrate 11,
The load of the storage tank 4 is the bent upper surface 11a of the installation substrate 11.
It is preferable that the bolts and nuts 12 are configured to be loaded and unloaded.

Further, on a side surface 11b of the installation board 11, a steel pedestal 1 for mounting and installing the weight measuring device 4 is provided.
3 is arranged perpendicularly to the side surface 11b of the installation substrate 11 and is fixed to the surface 11b by welding.
The lower surface of 3 is also fixedly supported by welding with the support member 14 so as to maintain horizontality. A weight measuring device 4 such as a load cell is positioned and fixed on the receiving table 13 with bolts and nuts 15 so that the weight measuring device 4 can be replaced with the mounting base 4a facing upward. The output terminal 4b of the weight measuring device 4 is provided with a conducting wire 16 connected to a separately provided operation means (not shown).

As described above, the mounting base 4a above the weight measuring device 4 installed on the outer side surface 3a of the chassis 3
Are fixed to the bottom sides 7b, 7b,... Of the plurality of storage tank fixing support members 7 fixedly provided on the outer surface 6d of the side wall of the sub-frame 6 disposed on the bottom of the outer tank 5a of the storage tank 5 on the upper surface of the storage tank 5. Place the support base 8 on the flat plate fixed and arranged by
The support base 8 is fixed to the mounting base 4 of the weight measuring device 4 with bolts and nuts 9. In addition, the support base 8 fixedly disposed on the bottom side 7b of the plurality of storage tank fixing support members 7 provided on the side wall outer surface 6d of the sub-frame 6,
The subframe 6 is arranged in the bottom of the storage tank 5 or in the storage tank 5 so that the subframe 6 is directly attached to the transportation vehicle body 2 such as the chassis 3. It is needless to say that it is necessary to design and form them so that they do not come into contact with each other and are spaced apart from each other with a gap T in consideration of their thickness, length, width and the like as appropriate.

When the support base 8 provided on the sub-frame 6 provided in the outer tank 5a of the storage tank 5 is fixedly mounted on the mounting base 4a of the weight measuring device 4, a packing is provided between them. When P is interposed, the vertical vibration during transportation operation is absorbed, the useless load on the weight measuring device 4 such as the load cell is reduced, and the occurrence of errors is prevented,
The occurrence of damage can be reduced.

With the above-described mounting structure, the storage tank 5 of the liquid transport tank truck 1 of the present invention is mounted on the chassis 3 of the transport vehicle via the weight measuring device 4. The number of installation positions of the mounting portion of the storage tank 5 having such a structure varies depending on the size of the storage tank to be mounted, but at least one for each of the two chassis.
It is preferable that the storage tank 5 is installed at a plurality of locations so that the storage tank 5 is supported and mounted. Although the location is not particularly specified, it is convenient for measurement to arrange the chassis 3 at symmetrical positions on the left and right, and on the front and rear, since the load applied to each is equally divided. It is. Are transmitted from the terminals 4b, 4b,... To the calculation means (not shown) through the conductors 16 through the terminals 4b, 4b,. Is measured.

Further, if a printing means (not shown) is connected to the arithmetic means (not shown), the measured weight of the storage tank 5 can be immediately recorded and collected. In addition, a central management system in which the data storage and storage means are connected to the calculation means by a communication line is provided, and the measurement and recording of the supply liquid amount is divided for each customer, collected, stored, stored and managed. If this is done, the usage status can always be grasped, and supply plans, production adjustments, etc. can be easily made and convenient.

As described above, the tanker truck 1 for transporting liquid according to the present invention is constructed by mounting the storage tank 5 for storing liquid on the transportation vehicle body 2 and filling and storing the liquids in the storage tank 5. It is transported to the destination of use and sent to a tank or the like for storage at the use destination and supplied. Then, since the total weight of the supplied liquid is always calculated by measuring the storage tank weight with the plurality of weight measuring devices 4, the total weight before and after the supply to the storage tank used is read. By taking a record, it can be measured immediately. Therefore, it is possible not only to immediately report the supplied liquid amount to the customer who is the user, but also to confirm the supplied amount in front of the customer, and to carry out a fair and fair transaction without misunderstanding. . Further, the present invention has a remarkable effect also in terms of business management such as formulation of a liquid supply plan.

[Experiment] An experiment was conducted to confirm the measuring accuracy of the weighing of the tanker truck for transporting liquid of the present invention. The tanker truck for transporting liquid used was a vehicle of the type shown in FIGS. 1 and 2, and the mounting structure of the storage tank 5 on the chassis 3 was the structure shown in FIGS. 3 and 4. Is as follows. ● Specifications of the transport vehicle body 2 ・ Length: 11m90cm ・ Overall width: 2m80cm ・ Chassis 3: 9m90cm in length, 70cm in length and two parallel arrangements ・ Body weight: about 9 tons ・ Loading weight: 6 tons

● Specifications of mounted storage tank 5 ・ Style: Insulated storage tank ・ Adiabatic method: Filling with perlite powder, keeping vacuum below 10 ^-2 Torr. ・ Length: about 7m30cm ・ Diameter of outer tank 5a: 1m80cm ・ Maximum loading capacity : 6000L ● Specifications of the weight measuring device 4 used ・ Model: Load cell manufactured by SI Technology, "SY91
-01050 "・ Usage mode: A total of 6 units are installed at 3 places on the outer side surface of each chassis 3.

The tank truck for transporting liquid as described above 1
About 3200 L (weight conversion: about 450) of liquid argon (boiling point at 1 atm-185.5 ° C) is placed in the insulated storage tank 5 mounted on the
0 kg) Filled and stored, transported to three customers A, B, and C and transported and filled with liquid argon in the storage tanks of each customer. Then, the measured value (X kg) obtained by measuring the supply liquid amount at each customer at each time is displayed in Table 1. In addition, the weighed value (Xk
In order to confirm the accuracy of the value of g), as a comparative example, the measurement was carried out at a weighing station at each customer at the same time using a conventional large-scale weighing machine for weighing the entire vehicle. As a comparative example, the weighing values (Ykg) measured at a conventional weighing station are also shown in Table 1, the difference between these weighing values (Y-X), and the weighing value of the present invention relative to the weighing value in the conventional method. Of the change [(Y−
X) / Y] × 100 (%).

[0031]

[Table 1]

As is apparent from the display in Table 1, the weighing value (X kg) of the tanker truck for transporting liquid of the present invention is about 1% as compared with the weighing value (Y kg) measured by the conventional large weighing machine. It was confirmed that a weighing value (Xkg) substantially equivalent to the weighing value (Ykg) obtained by the measurement using the conventional large-scale weighing machine was obtained. In addition, it has been confirmed that the tank truck 1 of the present invention can exhibit the convenience that the amount of liquid stored in the storage tank 5 can be immediately measured and grasped at an appropriate place.

In the above experiment, the case where liquid argon was transported using an adiabatic storage tank as the mounted storage tank was described as an example, but the present invention is not limited to this.
The present invention can be suitably applied to transport of low-temperature liquefied gas such as liquid oxygen, liquid nitrogen, and liquid helium, liquid hydrogen, and liquefied petroleum gas such as propane. Further, it is needless to say that a single-wall liquid storage tank capable of storing liquid can be mounted as a storage tank, and the present invention can be applied to transportation of liquid having a boiling point of 0 ° C. or more under atmospheric pressure.

[0034]

The tank truck for transporting liquid according to the present invention is implemented in the above-described embodiment, and has the following effects.
That is, since the liquid storage tank mounted on the transport vehicle body is mounted on the chassis with a weight measuring device interposed, the amount of liquid stored in the storage tank is always measured, so the liquid is transported to the customer and supplied. The measured liquid volume can be checked immediately without going to the weighing station that is separated from the storage tank to be supplied.This eliminates the need to stop at the weighing station before and after supply delivery, which occurs in conventional transport. it can. As a result, energy savings and cost savings due to the reduction of the mileage of tanker trucks, time savings and opportunities for traffic accidents are reduced, and low-temperature liquefied gas and other low-boiling liquefied gas are transported over time. Can prevent the occurrence of a measurement error, and can always perform correct measurement.

Further, since the weighing work before and after the supply and transfer of the liquid from the installed storage tank to the storage tank can be performed at the transfer and filling place, it is possible to measure and confirm the measurement in the presence of the customer. As a result, it is possible to carry out fair weighing transactions, and it is possible to carry out transactions with high mutual reliability. Furthermore, it is not necessary to set up a weighing station with a large measuring device for the customer to which the liquid is to be supplied, so that the equipment cost can be greatly reduced and the economic effect is extremely large.

[Brief description of the drawings]

FIG. 1 is a schematic side view illustrating an example of a tank truck for transporting liquid according to the present invention.

FIG. 2 is a schematic bottom view illustrating an example of a tanker truck for transporting liquid according to the present invention.

FIG. 3 is a schematic diagram illustrating a main part of an example of a structure in which a storage tank is mounted and installed on a transport vehicle chassis.

FIG. 4 is a schematic front view of a main part of the structure of the storage tank mounted in FIG. 3;

FIG. 5 is an explanatory diagram of a distribution operation route of a tank truck when transporting and supplying a low-temperature liquefied gas in the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... The tank truck for liquid transport of the present invention, 2 ... Transportation vehicle main body, 3 ... Chassis, 4 ... Weight measuring device, 4a ...
Mounting stand for weight measuring device, 5 ... storage tank, 5a ... outer tank,
6: Sub-frame, 7: Storage tank fixing support member, 8: Support base, 9, 12, 15: Bolt / nut, 11: Installation board, 13: Cradle, 14: Support member, 16: Conducting wire, P: Packing, S: The distance between the two chassis,
T: gap

Claims (5)

[Claims] 1. A liquid transport tank truck equipped with a storage tank for storing a liquid to be transported and supplied to a use destination, wherein the storage tank is mounted on a vehicle body via a weight measuring device. Tanker truck for transporting liquid. 2. The liquid transportation tank lorry according to claim 1, wherein a plurality of weight measuring devices are used to mount the storage tank on a vehicle body. 3. The liquid transportation tank lorry according to claim 1, wherein the weight measuring device is provided with a calculating means and a printing means. 4. The tank truck for transporting liquid according to claim 1, wherein the storage tank is a storage tank having heat insulation properties. 5. The tank truck for transporting liquid according to claim 4, wherein the liquid to be transported and supplied is a low-temperature liquefied gas.