JP5905145B1 - Physical quantity measuring device and physical quantity measuring method using physical quantity measuring device - Google Patents

Abstract

A physical quantity measuring device for a liquefied natural gas tank and a physical quantity measuring method using the physical quantity measuring device are provided. A casing 10 placed in a preliminary opening 2 provided in an upper part of a tank, and a guide wire in which a weight part 50 is suspended at one end and suspended from the casing 10 via the preliminary opening 2. 30, a guide wire 30 is wound, a winding part 40 that can move up and down the weight part 50, and a probe 20 that can be moved up and down while being guided by the guide wire 30 and can detect a physical quantity of liquefied natural gas. And an open / close valve portion 60 that is switchable between a communication state in which the casing 10 and the tank communicate with each other via the auxiliary opening 2 and a non-communication state in which the casing 10 and the tank do not communicate with each other through the auxiliary opening 2. The probe 20 and the weight part 50 are accommodated in the casing 10 in a state where the probe 20 is located above the weight part 50 and the weight part 50 is located above the on-off valve part 60. Make up to capacity. [Selection] Figure 2

Description

  The present invention relates to a physical quantity measuring device for a liquefied natural gas tank and a physical quantity measuring method using the physical quantity measuring device.

Liquefied natural gas (hereinafter referred to as LNG), which is a raw material for city gas used in Japan, is imported from multiple production areas.
Since LNG is a natural product, for example, when referring to its density, the density varies from production area to production area, and even for LNG from the same production area, the density varies depending on the transport and storage process. . In recent years, LNG import destinations have also diversified, but there are not enough facilities to use different storage tanks for each production area. Therefore, even LNG having different production areas are stored in the same tank.
However, in general, in LNG mixed storage, when LNG of different density (multiple production areas) is stored in the storage tank, it is known that the LNG has a density distribution with a higher density of LNG in the lower layer, and stratifies. It has been. It is known that when such stratification occurs, it causes a dangerous state in which an abnormal occurrence of boil-off gas occurs, so-called “rollover”.

In order to prevent this rollover, it is necessary to always know accurately the LNG density distribution stored in the tank. Therefore, there is an increasing need to install a density measuring device for monitoring the storage state of LNG in an “existing” LNG tank for the purpose of preventing this rollover.
For this reason, a simple density measuring device that periodically measures the density of LNG stored in a tank has been proposed (see, for example, Patent Document 1). The method of the cited document 1 includes two guidewires (ribbon cables) in which a detector attached to a cable that can be moved up and down by a driving device installed on a roof plate of an LNG tank is suspended by the weight of an anchor fixed in advance. ) To drive in a predetermined upper and lower section at a fixed position in the LNG tank, and the temperature and density during this period are detected by a sensor.

Japanese Patent No. 3383078

  In order to newly install a physical quantity measuring device such as a density measuring device in an “existing” LNG tank, if the tank is opened once and a new installation port is newly added, a large cost is required for the installation work. Therefore, it is desired to examine a method of newly installing an existing spare opening (for example, a small-diameter nozzle provided for release to the atmosphere). However, the density measuring device of the cited document 1 is excellent in that it can be installed using an existing preliminary opening, but it cannot be easily maintained and has room for improvement.

  Therefore, there has been a demand for a physical quantity measuring device that can be easily maintained in a state where it is attached to a limited space such as a preliminary opening of an existing LNG tank.

  In view of the above circumstances, an object of the present invention is to provide a physical quantity measuring device for a liquefied natural gas tank with high maintainability and a physical quantity measuring method using the physical quantity measuring device.

A characteristic configuration of a physical quantity measuring device for a liquefied natural gas tank according to the present invention is a casing placed in a preliminary opening provided in an upper portion of a tank for storing liquefied natural gas, and a weight portion is suspended at one end, A guide wire suspended from the casing through the preliminary opening, the guide wire is wound, and a winding portion capable of moving up and down the weight portion, and can be moved up and down while being guided by the guide wire. A probe configured to detect a physical quantity of the liquefied natural gas, a communication state in which the casing and the tank communicate with each other via the spare opening, and the casing and the tank communicate with each other through the spare opening. And an open / close valve that can be switched to a non-communication state,
The probe includes a guide portion having a guide hole through which the guide wire is inserted,
The guide portion includes an upper guide portion positioned on the upper side and a lower guide portion positioned on the lower side of the upper guide portion, and the upper surface of each of the upper guide portion and the lower guide portion is arranged from the center side. It has a guide part inclination structure that inclines downward as it goes outward,
The guide wire is configured to include a pair of a first guide wire and a second guide wire,
An interval restricting portion for determining an interval between the first guide wire and the second guide wire; and a guide link placed on the weight portion suspended from the first guide wire,
The interval regulating portion includes a first insertion portion through which the first guide wire is inserted, and a second insertion portion through which the second guide wire is inserted,
On the upper surface of the first insertion part, provided with a first guide link inclined structure that is inclined downward as it is separated from the second insertion part,
On the upper surface of the second insertion part, provided with a second guide link inclination structure that inclines downward as it is separated from the first insertion part,
The probe and the weight portion are configured to be housed in the casing in a state where the probe is located above the guide link and the weight portion is located above the on-off valve portion. is there.

  According to this configuration, the probe and the weight part can be stored in the casing in a state where the probe is located above the weight part and the weight part is located above the opening / closing valve part. The probe and the weight portion are accommodated in the casing so that the obstruction obstructing the opening and closing of the opening / closing valve portion is eliminated in the preliminary opening, and the tank can be sealed by making the opening / closing valve portion in a non-communication state. Since it can be sealed in this way, the casing can be opened without causing the natural gas evaporated from the tank to flow out, and this physical quantity measuring device (particularly, the probe and weight part in the casing) can be easily maintained.

  In other words, when in use, the probe is moved up and down in the tank to guide the guide wire, and the physical state is measured. During maintenance, the open / close valve is disconnected, the tank is sealed, and natural gas does not leak from the tank. A physical quantity measuring device for a liquefied natural gas tank that can be maintained in a safe state and has high maintainability can be provided.

In addition, the probe is guided by the guide wire through the guide hole at the guide portion, and can be moved up and down reliably.
The upper surface of the guide portion is provided with a guide portion inclined structure that is inclined downward from the center side toward the outer side. Therefore, when the probe is stored in the casing via the auxiliary opening, the guide portion is reserved. Even if it collides with an opening or the like, the collision force is received by the inclined structure of the guide portion, and can pass smoothly without being caught by the preliminary opening or the like, and can be stored in the casing.

Further, the probe is guided by the guide wire through the guide hole at the upper and lower guide portions of the upper guide portion and the lower guide portion, and can be moved up and down in a reliable and stable state.
Since the upper guide portion and the lower guide portion are each provided with an inclined guide portion structure, when the probe is housed in the casing via the spare opening portion, the upper guide portion or the lower guide portion is the spare opening portion. Even if it collides with a part or the like, the collision force is received by the inclined structure of the guide part, and can pass smoothly without being caught by the preliminary opening part and stored in the casing.

Further, when the probe is guided only by one axis of one guide wire, although the guide of the raising / lowering operation of the probe can be performed, the rotation operation about the one guide wire may not be prevented. In addition, since there is a flow due to convection of liquefied natural gas inside the tank, if the rotation operation cannot be prevented, the probe cannot be lifted or lowered reliably.
However, according to this configuration, since the probe can be guided by two axes of the first guide wire axis and the second guide wire axis, when the probe moves up and down, the probe rotates about the lifting direction. This can be prevented and lifted up and down reliably.
The guide link spacing restricting section always keeps the distance between the first guide wire and the second guide wire constant between the first insertion section and the second insertion section, so that the probe is always stably and reliably It can be moved up and down, and entanglement of both guide wires can be suppressed.
In addition, since the interval restricting portion includes the first guide link inclined structure and the second guide link inclined structure, even when the guide link collides with the preliminary opening or the like when the guide link is stored in the casing, the first The guide link inclined structure or the second guide link inclined structure receives the collision force, and can pass smoothly without being caught by the preliminary opening or the like, and can be stored in the casing.

According to a further feature of the physical quantity measuring device for a liquefied natural gas tank according to the present invention, the weight part is in contact with the inside of the tank when the winding part is lowered into the tank when operated. The point is to apply a tensile force to the winding part.

According to this configuration, by operating the winding part, the weight part suspended from one end of the guide wire is lowered by, for example, hanging down inside the tank, and is wound by the weight part while being in contact with the inside of the tank. Since a tensile force is applied to the part, the guide wire can be tensioned in a state where it is lowered in the vertical direction, for example. On the other hand, the weight part receives a frictional force corresponding to the difference between the weight of the weight part and the tensile force from the inside of the tank, for example, the floor of the tank. And by changing the winding state of the winding part and adjusting the tensile force, the tension of the guide wire and the frictional force between the weight part and the inside of the tank are adjusted. It can be kept stationary against the flow of liquefied natural gas convection inside the tank. Thereby, the inside of the tank can be moved up and down while the probe is guided by the guide wire, and the probe can be prevented from swinging.

A further characteristic configuration of the physical quantity measuring device for a liquefied natural gas tank according to the present invention is a pair of suspensions for suspending the guide wire at an upper position in the casing at a position between the winding portion and the weight portion. The probe is provided with a hanging portion, and the probe is configured to be movable up and down between the hanging portion and the guide link while being guided by the guide wire.

According to this configuration, the guide wire is suspended by the suspension portion, and the probe is further used as the guide wire.
It can be made to guide and raise / lower between a suspension part and the guide link mounted in the weight part.
  And since a suspension part suspends a guide wire in the position between a winding part and a weight part, the vector of the tensile force of a guide wire is changed by the suspension part to the direction changed with respect to the raising / lowering direction. The winding part can be installed at a position shifted from the ascending / descending direction. If it does so, since a winding part can be installed in the side surface of a tank, a physical quantity measuring device can be made compact.

  According to a further feature of the physical quantity measuring device for a liquefied natural gas tank according to the present invention, the weight part includes a top part formed in a substantially conical shape and a body part formed in a substantially cylindrical shape, It is in a point suspended from the guide wire.

  According to this configuration, the weight portion is suspended from the guide wire in a state where the body portion is positioned downward while the substantially conical top portion is positioned upward. Therefore, when the guide wire is wound and the weight portion is accommodated in the casing, even if the top collides with the preliminary opening, the collision force is received by the substantially conical shape effect, and it is smooth without being caught by the preliminary opening or the like. And can be stored in the casing.

  A further characteristic configuration of the physical quantity measuring device for a liquefied natural gas tank according to the present invention is that the casing is configured to include an openable / closable opening / closing portion on a side surface portion with respect to the lifting / lowering direction of the weight portion. is there.

According to this configuration, the opening / closing part can be closed during use to shut off the inside of the casing from the outside.
Since the opening / closing part is provided on the side surface of the casing with respect to the lifting / lowering direction of the weight part, when the probe and the weight part are stored in the casing, the opening / closing part is opened and the casing is opened when the opening / closing valve part is not in communication. The maintenance work can be performed by easily accessing the probe inside the casing.
That is, according to this configuration, the maintenance of the physical quantity measuring device is extremely easy.

  A further characteristic configuration of the physical quantity measuring device for a liquefied natural gas tank according to the present invention is that the opening / closing portion is configured to have a larger opening area than the preliminary opening portion in an open state.

  According to this configuration, when performing maintenance, the maintenance work through the opening / closing part is further facilitated than the maintenance from the opening part of the casing connected to the preliminary opening part. That is, the physical quantity measuring device can be maintained without removing the casing from the tank.

The characteristic configuration of the physical quantity measuring method using the physical quantity measuring device according to the present invention is that a casing placed in a preliminary opening provided in an upper part of a tank for storing liquefied natural gas, and a weight part is suspended at one end. The guide wire is suspended from the casing through the preliminary opening, the guide wire is wound, and the weight portion can be raised and lowered, and the guide wire is raised and lowered in a state guided by the guide wire. A probe that is freely configured and capable of detecting a physical quantity of the liquefied natural gas, a communication state in which the casing and the tank communicate with each other through the spare opening, and the casing and the tank through the spare opening. suspending the non-communicated state on the switching freely movable valve which does not communicate with the upper part of the said casing, said guide wire at a position between the weight portion and the winding portion Te And a suspender of the pair,
The probe includes a guide portion having a guide hole through which the guide wire is inserted,
The guide portion includes an upper guide portion positioned on the upper side and a lower guide portion positioned on the lower side of the upper guide portion, and the upper surface of each of the upper guide portion and the lower guide portion is arranged from the center side. It has a guide part inclination structure that inclines downward as it goes outward,
The guide wire is configured to include a pair of a first guide wire and a second guide wire,
An interval restricting portion for determining an interval between the first guide wire and the second guide wire; and a guide link placed on the weight portion suspended from the first guide wire,
The interval regulating portion includes a first insertion portion through which the first guide wire is inserted, and a second insertion portion through which the second guide wire is inserted,
On the upper surface of the first insertion part, provided with a first guide link inclined structure that is inclined downward as it is separated from the second insertion part,
In the physical quantity measuring method using the physical quantity measuring device provided with the second guide link inclined structure that is inclined downward as it is separated from the first insertion part on the upper surface of the second insertion part ,
After switching the on-off valve portion to be in the non-communication state, after attaching the probe and the weight portion with the probe positioned above the guide link inside the casing,
The guide wire is operated by switching the on-off valve portion to be in the communication state, and operating the winding portion to apply a tensile force to the winding portion in a state where the weight portion is landed on the tank. Fixed,
Thereafter, the physical quantity of the liquefied natural gas is measured by moving the probe up and down between the suspension and the guide link in the tank while being guided along the guide wire.

According to this configuration, the probe and the weight part are attached to the inside of the casing in a state where the tank is sealed in a non-communication state and the probe is positioned above the weight part. Measurement can be started with the casing and tank in communication.
Then, as a measurement operation, the winding part is operated to lower the weight part to the tank and land on the tank, and a tensile force is applied to the winding part to fix the guide wire. Can be fixed in a state of being surely lowered into the tank.
Further, since the physical amount of liquefied natural gas is measured by moving the probe up and down inside the tank while being guided along the guide wire, the probe can be prevented from swinging and the measurement accuracy is improved.

Schematic diagram showing physical quantity measuring device Main part explanatory drawing (front view) of physical quantity measuring device Explanatory drawing of main part of physical quantity measuring device (side view) Illustration of winding part of physical quantity measuring device Explanatory drawing (front view) of probe of physical quantity measuring device Explanatory drawing of probe of physical quantity measuring device (side view) Explanatory drawing of weight part of physical quantity measuring device (front view) Explanatory drawing of weight part of physical quantity measuring device (side view)

  A physical quantity measuring device for a liquefied natural gas tank that stores liquefied natural gas according to the present embodiment is provided in a preliminary opening 2 provided in an upper portion of a tank 1 that stores liquefied natural gas 9, as shown in FIGS. The weight part 50 is suspended from one end of the casing 10 to be placed, the guide wire 30 suspended from the inside of the casing 10 via the preliminary opening 2, and the guide wire 30 is wound to move the weight part 50 up and down. The probe 20, which is configured to freely move up and down while being guided by the guide wire 30 and capable of detecting the physical quantity of the liquefied natural gas 9, the casing 10, and the tank 1 through the preliminary opening 2. And an open / close valve portion 60 that can be switched to a non-communication state in which the casing 10 and the tank 1 do not communicate with each other via the preliminary opening 2. It is located, and, in a state of being positioned by weight 50 above the movable valve 60, the probe 20 and the parts 50 are housed configured to be able to casing 10.

The weight portion 50 applies a tensile force to the winding portion 40 while being in contact with the floor plate 3 inside the tank 1 when the winding portion 40 is operated and lowered into the tank 1.
The top plate 17 at the top of the casing 10 is provided with a suspension portion 33 that suspends the guide wire 30 at a position between the winding portion 40 and the weight portion 50, and the probe 20 is guided by the guide wire 30. In the state, it can be moved up and down between the suspension part 33 and the weight part 50.

The probe 20 includes a sensor case 21 (guide portion) having a guide hole 24 through which the guide wire 30 is inserted, and a guide that is inclined downward on the upper surface of the sensor case 21 from the central side toward the outer side. It has a part inclination structure.
The sensor case 21 includes an upper guide portion 22 positioned on the upper side and a lower guide portion 23 positioned on the lower side of the upper guide portion 22, and guides are provided on the upper surfaces of the upper guide portion 22 and the lower guide portion 23. It has a part inclination structure.
The guide wire 30 is configured to include a first guide wire 31 and a second guide wire 32, and includes an interval restricting portion 73 that determines an interval between the first guide wire 31 and the second guide wire 32. A guide link 70 having an interval restriction portion 73, a support side engagement portion 71 (first insertion portion) through which the first guide wire 31 is inserted, and a supported side engagement portion through which the second guide wire 32 is inserted. 72 (second insertion portion), and on the upper surface of the first engagement hole 71a, a chamfered portion 74 (first guide link inclined structure) that is inclined downward as it is separated from the second engagement hole 72a, On the upper surface of the second engagement hole 72a, a chamfered portion 74 (second guide link inclined structure) that is inclined downward as it is separated from the first engagement hole 71a is provided.
The weight portion 50 includes a top portion 51 formed in a substantially conical shape and a body portion 52 formed in a substantially cylindrical shape, and is suspended from the guide wire 30 at the top portion 51.

  The casing 10 includes an opening / closing portion 11 that can be opened and closed on the side surface with respect to the lifting / lowering direction of the weight portion 50. The opening / closing portion 11 is configured to have an opening area larger than that of the preliminary opening portion 2 in an opened state.

Hereinafter, the physical quantity measuring device will be described in detail.
First, the tank 1 to which the physical quantity measuring device is attached will be described. The tank 1 is a tank that stores the liquefied natural gas 9, and the top plate portion is formed on a spherical surface, and includes a preliminary opening 2 that is a general-purpose inspection port. The bottom surface inside the tank 1 is composed of a floor plate 3 that is a horizontal floor. The physical quantity measuring device is used by being attached to the preliminary opening 2.

  The physical quantity measuring device includes a casing 10, a probe 20, an elevator 29, a guide wire 30, a winding part 40, a weight part 50, and an opening / closing valve part 60.

The casing 10 will be further described.
The casing 10 is a main body of the physical quantity measuring device. The casing 10 includes a substantially cylindrical large-diameter portion 10a, a reduced-diameter portion 10b whose cylindrical shape is reduced in diameter downward, and a cylindrical small-diameter portion 10c having a smaller diameter than the large-diameter portion 10a. The upper part of the casing 10 is constituted by a large diameter part 10a, and the lower part is constituted by a small diameter part 10c. The large diameter part 10a and the small diameter part 10c are connected via a reduced diameter part 10b.
An upper flange 15 is provided at the top of the large diameter portion 10a, and a lower flange 16 is provided at the bottom of the small diameter portion 10c.
The large-diameter portion 10a includes a flange-shaped opening / closing portion 11. Further, a base 41 serving as a base for supporting the winding part 40 is provided on the side surface of the large diameter part 10a. A guide wire introduction port 12 that guides the guide wire 30 from the winding portion 40 to the inside of the casing 10 is provided on the side surface of the large diameter portion 10a.
Further, a suspension portion 33 that suspends the guide wire 30 is provided inside the large-diameter portion 10 a and on the lower surface of the top plate 17.
The casing 10 is fixed to the preliminary opening 2 by the lower flange 16 via the on-off valve portion 60.
A top plate 17 is fixed to the upper flange 15 by flange connection. An elevator 29 for the probe 20 is placed on the top surface of the top plate 17.

It supplements about the flange-shaped opening-and-closing part 11, the upper flange 15, and the lower flange 16. FIG.
The flange-shaped opening / closing part 11, the upper flange 15 and the lower flange 16 each have a circular opening. In this example, the opening diameter of the flange-shaped opening / closing portion 11 and the upper flange 15 is configured to be larger than the opening diameter of the lower flange 16. In this example, the opening diameters of the flange-shaped opening / closing part 11 and the upper flange 15 are the same. The opening diameter of the flange-shaped opening / closing portion 11 and the upper flange 15 is approximately 1.5 times the opening diameter of the lower flange 16.
In this way, when the inside of the casing 10 is accessed to maintain the physical quantity measuring device by making the opening diameter of the opening / closing portion 11 and the upper flange 15 larger than the opening diameter of the lower flange 16, the lower flange is used. It is easier to access the inside of the casing 10 via the opening / closing part 11 or the upper flange 15 than opening the door 16 and accessing from there. That is, the maintainability of the physical quantity measuring device is improved.
In this example, the opening / closing portion 11 has a flange diameter of 12B. Further, the flange diameter of the upper flange 15 is 12B. The flange diameter of the lower flange 16 is 8B.

The probe 20 will be further described.
The probe 20 is a sensor unit that moves up and down in the tank 1 and measures a physical quantity (for example, density) of the liquefied natural gas 9.
The probe 20 includes a sensor head 25 that is a physical quantity detection unit and a sensor case 21 that supports the sensor head 25.
Further, the probe 20 is connected to a length measuring tape 28 that pulls the probe 20 up and down and plays a role of a gauge that detects the height of the probe 20 through a connector 26. The length measuring tape 28 further includes a power line and a signal line connected to the sensor head 25.

  The probe 20 is suspended from the length measuring tape 28 when used (measured) and suspended from the tank 1 during maintenance. The probe 20 is pulled by the length measuring tape 28 during maintenance, and is moved to the casing 10 together with the length measuring tape 28. Stored. The length measuring tape 28 is wound up by an elevator 29 and is moved up and down by being wound up. The length measuring tape 28 is mainly made of stainless steel (SUS316L), and the surface thereof is coated with tetrafluoroethylene resin. By coating with tetrafluoroethylene resin, the probe 20 can be moved up and down smoothly.

  The sensor case 21 includes an upper guide portion 22, a lower guide portion 23, and a column 21 a and a connection tool 26 that connect and support the upper guide portion 22 and the lower guide portion 23, respectively. In this example, the sensor case 21 is made of stainless steel (SUS304).

  The sensor case 21 has a bowl-like shape that connects the upper guide portion 22 and the lower guide portion 23 using the support column 21a in this way, thereby reducing the weight of the sensor case 21 and improving the workability of maintenance. be able to. Further, when the sensor case 21 is suspended from the outside of the room temperature tank 1 into the low temperature liquefied natural gas 9, distortion occurs due to the temperature change. Even if the strain stays only in the longitudinal direction of 21a and the strain is generated in the other direction, strain stress is received by the elastic force of the column 21a, which is a rod, and the strain is not affected.

The upper portion of the upper guide portion 22 has a substantially conical shape with an acute angle whose horizontal cross section is distorted into an elliptical shape. In other words, the upper surface of the upper guide portion 22 has a structure (guide portion inclined structure) that is inclined downward as it goes from the center side to the outer side. And the upper guide part 22 is equipped with the two guide holes 24 in the both ends of this elliptical long-axis direction.
In this example, the angle of the inclined surface of the substantially conical shape is an angle α = 60 ° in a front view shown in FIG. 5, and an angle β in a side view shown in FIG. 6 is β = 67 °. A preferred range for α is approximately 45 ° to 80 °. A preferred range for β is approximately 50 ° to 80 °.
Further, both end portions in the major axis direction of the lower portion of the upper guide portion 22 are chamfered on the lower surface side so as to incline from the center side of the upper guide portion 22 toward the outer side. By forming the upper guide portion 22 in this way, the fluid resistance generated between the upper guide portion 22 and the liquefied natural gas 9 when the probe 20 moves up and down is reduced, and the probe 20 can be moved up and down smoothly. become able to.
In this way, when the probe 20 is housed in the casing 10, even if the upper guide portion 22 collides with the preliminary opening portion 2 or the opening portion of the lower flange 16, the collision force is received by the inclined structure of the guide portion, and the preliminary opening portion 2. It is possible to pass through the opening of the lower flange 16 smoothly without being caught by the like.
Furthermore, the upper guide portion 22 includes an upper guide portion through hole 22a penetrating in the vertical direction at the center portion thereof.

The lower guide portion 23 has a horizontal cross section that is distorted into an elliptical shape. And the lower guide part 23 is equipped with the two guide holes 24 in the both ends of this elliptical long-axis direction.
The lower guide portion 23 is chamfered on both the upper surface side and the lower surface side so as to incline from the center side of the lower guide portion 23 toward the outer side at both ends in the major axis direction. That is, the upper surface of the lower guide portion 23 has a structure (guide portion inclined structure) that is inclined downward as it goes from the center side to the outer side.
By forming the lower guide portion 23 in this way, the fluid resistance generated between the lower guide portion 23 and the liquefied natural gas 9 when the probe 20 moves up and down is reduced, and the probe 20 can be moved up and down smoothly. become able to.
In this way, when the probe 20 is suspended from the casing 10, even if the upper guide portion 22 collides with the opening portion of the preliminary opening portion 2 or the lower flange 16, the guide portion inclined structure receives the collision force and the preliminary opening portion. The opening of the lower flange 16 can be smoothly passed without being caught by the part 2 or the like.
Further, the lower guide portion 23 includes a lower guide portion through hole 23a penetrating in the vertical direction at the center thereof.

  Each of the upper guide portion 22 and the lower guide portion 23 includes a guide hole 24 through which the guide wire 30 is inserted to guide the probe 20 to move up and down.

  The connection tool 26 includes a probe suspending portion 26a, a support column 26b, a connector support portion 26c, and a support column 26d that are suspended from the length measuring tape 28. The support column 26b is fixed to the upper guide portion 22 inside the upper guide portion through hole 22a. The connector support portion 26c is suspended by a support column 26b.

The sensor head 25 is suspended from the connector support portion 26c by a column 26d in a state of slightly entering the lower guide portion through hole 23a. Thus, by making the sensor head 25 slightly enter the upper guide portion through hole 22a, the sensor provided in the sensor head 25 is surrounded by the lower guide portion through hole 23a, and the liquefied natural gas 9 inside the tank 1 is enclosed. Therefore, the measurement accuracy of the physical quantity measuring device can be improved.
The power line and the signal line included in the length measuring tape 28 are inserted into the upper guide part through hole 22a and further connected to the sensor head 25 via the connector 27 supported by the connector support part 26c.

The guide wire 30 will be further described. In this example, the guide wire 30 is made of stainless steel (SUS304).
When the probe 20 moves up and down, the guide wire 30 guides the probe and suppresses swinging. A guide wire connection terminal 30a is provided at the tip of the guide wire 30, and the weight portion 50 is suspended.

  In use, the guide wire 30 is supported while being applied with a tensile force by the winding portion 40, and is guided into the casing 10 through the guide wire introduction port 12. And it is suspended by the tank 1 through the preliminary | backup opening part 2 in the state which suspended the weight part 50 in the state suspended by the suspension part 33 which is a pulley. At this time, the weight portion 50 is suspended on the guide wire 30 in a state where the weight portion 50 is in contact with the floor plate 3 and a tensile force is applied to the winding portion 40.

In this example, the guide wire 30 is configured as a pair of guide wires 30 of a first guide wire 31 and a second guide wire 32. One end of each of the first guide wire 31 and the second guide wire 32 is supported by an individual winding part 40, and a weight part 50 is individually suspended from the other end. The first guide wire 31 and the second guide wire 32 are suspended by individual suspension portions 33 at positions between the winding portion 40 and the weight portion 50.
The distance L1 between the first guide wire 31 and the second guide wire 32 is regulated by the guide link 70 to be constant. In this example, L1 is approximately 100 mm. And when the weight part 50 is suspended by each of the 1st guidewire 31 and the 2nd guidewire 32 currently controlled by the guide link 70, the width L2 of the two weight parts 50 suspended is About 180 mm.

The guide link 70 includes an interval restricting portion 73 that defines an interval between the first guide wire 31 and the second guide wire 32, a support side engaging portion 71, and a supported side engaging portion 72.
The guide link 70 is made of stainless steel (SUS304) in this example.

  The support side engaging portion 71 is provided with a first engaging hole 71a through which the first guide wire 31 is swingably inserted. The support side engaging portion 71 is placed on the weight portion 50 suspended from the first guide wire 31 and is further supported by the first guide wire 31 via the first engaging hole 71a. Support.

  The interval restricting portion 73 is a rod-shaped member provided between the first guide wire 31 and the second guide wire 32. The interval restricting portion 73 is supported at one end of the interval restricting portion 73 at an upper position of the support side engaging portion 71.

  The supported-side engaging portion 72 is supported by the other end portion of the interval restricting portion 73. The supported engagement portion 72 includes a second engagement hole 72a through which the first guide wire 31 is swingably inserted.

It supplements about the space | interval control part 73. FIG.
A pair of guide wires 30 are provided at both ends of the space restricting portion 73, that is, at each corner between the space restricting portion 73 and the support side engaging portion 71 and at each corner between the space restricting portion 73 and the supported side engaging portion 72. A chamfered portion 74 is provided which is inclined downward toward the outside. The angle γ of the chamfered portion 74 is γ = 60 ° in this example.

The chamfer 74 will be supplemented.
The chamfered portion 74 has an inclined structure inclined downward on the upper surface of the support side engagement portion 71 (first engagement hole 71a) as the distance from the supported side engagement portion 72 (second engagement hole 72a) increases. And a guide link inclined structure that is inclined downward as the distance from the support-side engagement portion 71 (first engagement hole 71a) increases, on the upper surface of the supported-side engagement portion 72 (second engagement hole 72a).

  The guide wire 30 is wound up by the winding portion 40 during maintenance, and the weight portion 50 is accommodated in the casing 10 together with a part of the guide wire 30 connected to the weight portion 50.

The relationship between the probe 20 and the guide wire 30 will be supplemented.
The probe 20 includes a guide hole 24 that guides the ascent and descent of the probe 20 through the guide wire 30. The guide hole 24 includes an upper guide hole 24 a and an upper guide hole 24 b provided in the upper guide part 22, and a lower guide hole 24 c and a lower guide hole 24 d provided in the lower guide part 23.
The upper guide hole 24 a and the lower guide hole 24 c are guided by the first guide wire 31. The upper guide hole 24 b and the lower guide hole 24 d are guided by the second guide wire 32.

The guide hole 24 is engaged with the guide wire 30 to suppress the swinging of the probe 20. Thus, the upper guide portion 22 has two locations, the upper guide hole 24a and the upper guide hole 24b. By being guided by the guide wire 30 (31, 32) of the book, the probe 20 can be prevented from rotating and swinging when being raised and lowered, and can be raised and lowered stably. In addition, the lower guide portion 23 is guided by the two guide wires 30 (31, 32) at the two locations of the lower guide hole 24c and the lower plan, so that the rotation and swinging of the probe 20 during ascent and descent are suppressed. As a result, the elevator can be moved up and down stably.
That is, the probe 20 is guided by the two guide wires 30 (31, 32) through the four guide holes 24 (24a, 24b, 24c, 24d), so that the probe 20 can be reliably rotated and swung when the probe 20 is raised and lowered. Can be suppressed.

It supplements about the winding part 40. FIG.
The winding part 40 winds up the guide wire 30 and winds it down and hangs down to give a tensile force. In this example, a so-called winch is used as the winding part 40. As the winding portion 40, a general-purpose product can be used regardless of its form as long as it exhibits a similar function other than a so-called winch.
In this example, each of the first guide wire 31 and the second guide wire 32 is provided with a winding part 40. As shown in FIG. 3, the winding parts 40 are not arranged in parallel. Rather, it is arranged with respect to the casing 10 so as to be arranged in a V shape with a certain angle with respect to the center of the casing 10.
Thus, by arrange | positioning so that it may rank in a V shape, the two bases 41 and the winding part 40 can be provided also with respect to the casing 10 with a small diameter.

The weight part 50 will be supplemented.
The weight part 50 includes a top part 51, a body part 52, and a bottom part 53. The weight portion 50 is made of stainless steel (SUS304) in this example.
The top 51 is formed in a substantially conical structure that is convex upward. The weight part 50 is suspended from the guide wire 30 at the top part 51. Since the top portion 51 is configured in a conical shape, when the guide wire 30 is wound up and the weight portion 50 is accommodated in the casing 10, even if the top portion 51 collides with the opening portion of the lower flange 16, the top portion 51 receives the collision force. The opening of the lower flange 16 can be smoothly passed without being caught by the opening 2 or the like. The angle δ of the top 51 is δ = 60 ° in this example.

The trunk | drum 52 is comprised by the cylindrical shape.
The bottom portion 53 has a flat plate portion 53a that is a bottom portion formed in a flat plate shape, and a chamfered chamfered portion 53b is provided on the outer peripheral portion thereof. Since the chamfered portion 53b is provided, when the weight portion 50 is suspended from the casing 10, even if the bottom portion 53 collides with the opening portion of the lower flange 16, the collision force is received and smoothly passes through the opening portion of the lower flange 16. can do.

Further, by providing the top portion 51 and the chamfered portion 53 b, the chamfered portion 53 b receives the fluid drag of the liquefied natural gas 9 when it hangs down in the liquefied natural gas 9, and the top portion 51 is further back of the weight portion 50. In order to suppress the occurrence of turbulent flow of the liquefied natural gas 9, it is possible to hang straight toward the floor plate 3 without swinging the weight portion 50.
The diameter D of the weight part 50 is approximately 80 mm in this example.

It supplements about the on-off valve part 60. FIG.
The on-off valve portion 60 can pass through the probe 20, the guide wire 30, and the weight portion 50 in a communication state in which the casing 10 and the tank 1 communicate with each other, and reliably in a non-communication state in which the preliminary opening 2 is sealed. What is necessary is just to be able to seal the preliminary opening 2. In this example, a full-bore type ball valve suitable for this purpose is used, but other types of valves and closures are not limited as long as they have similar functions. The on-off valve unit 60 may be provided in the casing 10.

Next, a physical quantity measuring method using the physical quantity measuring apparatus will be described.
The physical quantity measuring method using this physical quantity measuring device uses the above-described physical quantity measuring device to switch the on-off valve portion 60 so that the casing 10 and the tank 1 are not in communication with each other. After the probe 20 and the weight part 50 are attached in a state where the probe 20 is positioned above the weight part 50, the on-off valve part 60 is switched to bring the casing 10 and the tank 1 into communication with each other. A state where the guide wire 30 is fixed by applying a tensile force to the winding portion 40 in a state where the weight portion 50 is landed on the tank 1 by operating, and then the probe 20 is guided along the guide wire 30. Then, the physical quantity of the liquefied natural gas 9 is measured by raising and lowering inside the tank 1.
Hereinafter, as a description of a physical quantity measuring method using the physical quantity measuring apparatus 100, a use start procedure and a maintenance procedure will be described.

First, a description of the procedure for starting use will be added.
[Explanation of start-up procedure]
[Starting procedure 1]
Before the start of use of the physical quantity measuring device, that is, after the most recent maintenance of the physical quantity measuring device is performed, the opening / closing valve portion 60 is connected and fixed to the preliminary opening 2, and the lower flange 16 of the casing is connected and fixed to the opening / closing valve portion 60. The opening / closing part 11 is opened with the opening / closing valve part 60 sealed. Further, the probe 20, the guide wire 30, the weight portion 50, and the guide link 70 are removed and are outside the casing 10. The length measuring tape 28 is in a state of being hung inside the casing 10. Further, the opening / closing part 11 is released.

  First, the other end side (not shown) of the guide wire connection terminal 30a of the first guide wire 31 is inserted into the first engagement hole 71a of the guide link 70 from below. Next, the other end side is inserted through the lower guide hole 24c and the upper guide hole 24a of the sensor case 21 in this order.

  Next, the first guide wire 31 is hooked on the pulley which is the suspension portion 33, and the other end side is inserted into the guide wire introduction port 12 from the inside of the casing 10. Then, the other end side is connected to the winding part 40. The operation inside the casing 10 can be performed through an opening of the opening / closing part 11 provided in a side surface portion of the casing 10.

  Thereafter, the first guide wire 31 is wound up by the winding portion 40 until the guide wire connecting terminal 30a protrudes to the outside of the casing 10 through the opening / closing portion 11 to an appropriate length.

  Next, the other end side (not shown) of the guide wire connection terminal 30 a of the second guide wire 32 is inserted into the second engagement hole 72 a of the guide link 70 from below. Next, this other end side is inserted through the lower guide hole 24d and the upper guide hole 24b of the sensor case 21 in this order.

Next, the second guide wire 32 is hooked on the pulley which is the suspension portion 33, and the other end side is inserted from the inside of the casing 10 into the guide wire introduction port 12.
Then, the other end side is connected to the winding part 40. The operation inside the casing 10 can be performed through an opening of the opening / closing part 11 provided in a side surface portion of the casing 10.

  Thereafter, the second guide wire 32 is wound up by the winding portion 40 until the guide wire connection terminal 30a protrudes to the outside of the casing 10 through the opening / closing portion 11 to an appropriate length.

  And the weight part 50 is connected to each of the guide wire connection terminal 30a and the guide wire connection terminal 30a outside the casing 10.

  Here, the “appropriate length” relating to the handling of the guide wire connection terminal 30a and the guide wire connection terminal 30a means that the length from the suspension portion 33 to the bottom portion 53 of the weight portion 50 in the guide wire 30 is within the casing 10. Means a length that is shorter than the distance from the suspension portion 33 to the lower flange 16 and that secures a sufficient distance for performing the work of attaching the weight portion 50 outside the casing 10.

  Next, the winding part 40 is unwound so that the guide wire 30 has a sufficient length. The weight 20 is inserted into the casing 10 and the bottom 53 is opened and closed while maintaining the state in which the probe 20 is pulled out of the casing 10 together with a part of the guide wire 30 through the opening / closing portion 11. Land on the valve surface of the valve portion 60. Here, the sufficient pre-length is the entire surface of the probe 20 in a state where the probe 20 engaged with the guide wire 30 is pulled out to the outside of the casing 10 through the opening / closing part 11 together with a part of the guide wire 30. In addition, it means that the worker can easily access.

  Next, the length measuring tape 28 is pulled out of the casing 10 via the opening / closing portion 11 and fixed to the probe suspension 26 a, and the electric wires and signal lines of the length measuring tape 28 are connected to the connector 27.

  Next, the probe 20 is inserted into the casing 10, the length measuring tape 28 is wound up by the elevator 29, and the probe 20 is suspended directly below the suspension part 33. The pre-length of the guide wire 30 is wound up by the winding part 40 and the weight part 50 is suspended below the probe 20.

  By the above procedure, the suspension part 33, the probe 20, the guide link 70, and the weight part 50 are arranged in the order of the suspension part 33, the probe 20, the guide link 70, and the weight part 50 in order from the top in the vertical direction. 10 will be arranged and housed inside.

In this state, the opening / closing part 11 is closed. The air inside the casing 10 is discharged from the elevator vent hole 29a while supplying an inert gas (for example, nitrogen gas) from the casing purge hole 13, the guide wire inlet purge hole 14, and other purge holes (not shown) to the casing 10. Then, the inside of the casing 10 is replaced with an inert gas. This is to suppress the risk of igniting the mixture of natural gas and air.
When this replacement is completed, the on-off valve portion 60 is opened, and the casing 10 and the tank 1 can be communicated safely.

[Starting procedure 2]
The on-off valve part 60 is opened, the second guide wire 32 is unwound by the winding part 40, the weight part 50 is suspended inside the tank 1, the flat plate part 53a of the weight part 50 is landed on the floor board 3, and the weight In a state where the weight of the portion 50 is supported by both the floor plate 3 and the second guide wire 32, the second guide wire 32 is fixed and the installation of the second guide wire 32 is completed. If it does so, tensile force will act on the winding part 40 via the 2nd guidewire 32, and the 2nd guidewire 32 will be in a tension | tensile_strength state. At the same time, a static frictional force acts between the floor plate 3 and the flat plate portion 53a. By fixing the second guide wire 32 in such a state, the second guide wire 32 and the weight portion 50 are substantially stationary even if there is a convection flow of the liquefied natural gas 9 inside the tank 1. become.
When the second guide wire 32 is unwound by the winding portion 40 and the weight portion 50 is suspended inside the tank 1, the guide link 70 is suspended from the first guide wire 31 by the support side engaging portion 71. The weight portion 50 is supported by the top portion 51 of the weight portion 50 and remains inside the casing 10.

Next, the same operation as described above is performed on the first guide wire 31 and the weight portion 50. At this time, the guide link 70 is supported by the top part 51 of the weight part 50 suspended from the first guide wire 31 by the support side engaging part 71 together with the first guide wire 31 and the weight part 50. 1, the first guide wire 31 and the second guide wire 32, which are a pair of guide wires 30, are regulated by the spacing regulating portion 73 and are kept parallel while maintaining the desired spacing L 1. And is vertically suspended and fixed.
In this way, the installation of the guide wire 30 (31, 32) is completed. If it does so, the probe 20 will be in the state which can be raised / lowered between the suspension part 33 and the guide link 70. FIG.

  When the installation of the guide wire 30 is completed in this way, the physical quantity of the liquefied natural gas 9 can be measured while the probe 20 is suspended inside the tank 1 by the elevator 29 and moved up and down inside the liquefied natural gas 9. become.

[Maintenance procedure]
When maintenance is performed, the state before the start of use is restored by a procedure reverse to the procedure described in the above [Description of Start of Use Procedure].
Specifically, when the on-off valve unit 60 is sealed and the on-off unit 11 is opened, and the probe 20, the guide wire 30, the weight unit 50, and the guide link 70 are removed, the casing is removed. If the length measuring tape 28 is hung inside the casing 10, the maintenance is completed.
Hereinafter, since it is the reverse operation of [Explanation of the procedure for starting use], only the necessary part will be explained.

  First, the suspension part 33, the probe 20, the guide link 70, and the weight part 50 are in order from the top in the vertical direction in the reverse order of the above [Starting Procedure 2]. 70 and the weight part 50 are arranged in the casing 10 and stored in the order of the weight part 50.

  The probe 20, the guide link 70, and the weight portion 50 are accommodated in the casing 10 through the preliminary opening 2 and the opening of the lower flange 16 when the guide wire 30 is rolled up and stored in the casing 10. When passing through the preliminary opening 2 or the opening of the lower flange 16, the probe 20, the guide link 70, or the weight part 50 collides with the opening of the preliminary opening 2 or the lower flange 16 due to the swinging motion when moving up and down. There is. However, in this example, since the probe 20 has the guide portion inclined structure, even if it collides with the preliminary opening 2 or the like, the top portion 51 receives the collision force and can be stored smoothly. Moreover, since the weight part 50 is provided with the substantially cone-shaped top part 51, even if it collides with the preliminary | backup opening part 2 etc., the top part 51 will receive the collision force, and can be accommodated smoothly. Similarly, since the chamfer 74 receives the collision force, the guide link 70 can be stored smoothly.

After the suspension part 33, the probe 20, the guide link 70, and the weight part 50 are accommodated in the casing 10, the on-off valve part 60 is disconnected. Then, the natural gas inside the casing 10 is replaced with an inert gas. This replacement procedure is the same as the replacement in [Starting Procedure 1].
When this replacement is completed, the opening / closing part 11 is opened, and the probe 20, the guide wire 30, the weight part 50, and the guide link 70 are taken out of the casing 10 by a procedure reverse to the method shown in [Starting Procedure 1]. The length measuring tape 28 is hung inside the casing 10.
This is the end of the maintenance.

[Another embodiment]
The present invention is not limited to the above-described embodiment, and various other modifications are possible. As an example of the change, another embodiment of the present invention will be described below. Note that the configurations of the following embodiments are not limited to those applied individually, and can be applied in combination with the configurations of other embodiments as long as no contradiction arises.

(1) In the above-described embodiment, the physical quantity measuring device is a density meter, for example, as a physical quantity. However, any physical property can be used as long as it is a physical quantity of the liquefied natural gas 9.
For example, the liquid level height of the liquefied natural gas 9 stored in the tank 1 can be measured. Of course, the temperature can also be measured. Further, if the sensor head 25 includes a light detection unit of a near-infrared spectroscopy system and an optical fiber instead of the signal line of the length measuring tape 28 or together with the signal line, the physical properties of the liquefied natural gas 9 are integrated. Can also be understood.

(2) In the above-described embodiment, an example in which the physical quantity measuring device is, for example, one of the density meters as the physical quantity has been described. It can also be configured to measure.

  Note that the configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. The embodiment disclosed in this specification is an exemplification, and the embodiment of the present invention is not limited to this. The embodiment can be appropriately modified without departing from the object of the present invention.

  The physical quantity measuring apparatus according to the present invention can be usefully used as a physical quantity measuring apparatus for a liquefied natural gas tank with high maintainability, and can be usefully used as a physical quantity measuring method using the physical quantity measuring apparatus.

1: Tank 2: Preliminary opening 3: Floorboard (inside)
9: liquefied natural gas 9: natural gas 10: casing 11: opening / closing part 20: probe 21: sensor case (guide part)
22: Upper guide part 23: Lower guide part 24: Guide hole 30: Guide wire 33: Suspension part 40: Winding part 50: Weight part 51: Top part 52: Body part 60: On-off valve part 70: Guide link 71a: Support side engagement hole (engagement hole)
72a: supported side engagement hole (engagement hole)
73: Spacing regulating portion 74: Chamfered portion (first guide link inclined structure, second guide link inclined structure)

Claims (7)

A casing placed in a preliminary opening provided in an upper portion of a tank for storing liquefied natural gas; a guide wire having a weight portion suspended from one end and suspended from the casing through the preliminary opening; The guide wire is wound, and a winding part capable of moving up and down the weight part, and a probe configured to be movable up and down while being guided by the guide wire, and capable of detecting a physical quantity of the liquefied natural gas, An open / close valve portion that is switchable between a communication state in which the casing and the tank are communicated with each other via the preliminary opening, and a non-communication state in which the casing and the tank are not communicated with each other through the preliminary opening.
The probe includes a guide portion having a guide hole through which the guide wire is inserted,
The guide portion includes an upper guide portion positioned on the upper side and a lower guide portion positioned on the lower side of the upper guide portion, and the upper surface of each of the upper guide portion and the lower guide portion is arranged from the center side. It has a guide part inclination structure that inclines downward as it goes outward,
The guide wire is configured to include a pair of a first guide wire and a second guide wire,
An interval restricting portion for determining an interval between the first guide wire and the second guide wire; and a guide link placed on the weight portion suspended from the first guide wire,
The interval regulating portion includes a first insertion portion through which the first guide wire is inserted, and a second insertion portion through which the second guide wire is inserted,
On the upper surface of the first insertion part, provided with a first guide link inclined structure that is inclined downward as it is separated from the second insertion part,
On the upper surface of the second insertion part, provided with a second guide link inclination structure that inclines downward as it is separated from the first insertion part,
The probe and the weight portion are configured to be housed in the casing in a state where the probe is located above the guide link and the weight portion is located above the on-off valve portion. Physical quantity measuring device for liquefied natural gas tank.   The liquefied natural gas tank for a liquefied natural gas tank according to claim 1, wherein the weight portion applies a tensile force to the winding portion while being in contact with the inside of the tank when the winding portion is operated and lowered into the tank. Physical quantity measuring device. The upper part in the casing is provided with a pair of suspension parts for suspending the guide wire at a position between the winding part and the weight part, and the probe is guided by the guide wire in the state of the guide wire. The physical quantity measuring device for a liquefied natural gas tank according to claim 1, wherein the physical amount measuring device is configured to be movable up and down between a suspension portion and the guide link . The parts by weight, and the top portion formed in a substantially conical shape, and a body portion formed in a substantially cylindrical shape, in any one of claim 1 to 3, which is hanging in the guide wire in said top The physical quantity measuring device for the liquefied natural gas tank described. The physical quantity measuring device for a liquefied natural gas tank according to any one of claims 1 to 4 , wherein the casing is configured to include an openable and closable opening / closing portion at a side surface portion with respect to the lifting / lowering direction of the weight portion. . The physical quantity measuring device for a liquefied natural gas tank according to claim 5 , wherein the opening / closing portion is configured to have an opening area larger than that of the preliminary opening portion in an open state. A casing placed in a preliminary opening provided in an upper portion of a tank for storing liquefied natural gas; a guide wire having a weight portion suspended from one end and suspended from the casing through the preliminary opening; The guide wire is wound, and a winding part capable of moving up and down the weight part, and a probe configured to be movable up and down while being guided by the guide wire, and capable of detecting a physical quantity of the liquefied natural gas, An open / close valve portion switchable between a communication state in which the casing and the tank are communicated with each other via the preliminary opening and a non-communication state in which the casing and the tank are not communicated with each other through the preliminary opening ; A pair of suspension parts for suspending the guide wire at a position between the winding part and the weight part on the upper part ;
The probe includes a guide portion having a guide hole through which the guide wire is inserted,
The guide portion includes an upper guide portion positioned on the upper side and a lower guide portion positioned on the lower side of the upper guide portion, and the upper surface of each of the upper guide portion and the lower guide portion is arranged from the center side. It has a guide part inclination structure that inclines downward as it goes outward,
The guide wire is configured to include a pair of a first guide wire and a second guide wire,
An interval restricting portion for determining an interval between the first guide wire and the second guide wire; and a guide link placed on the weight portion suspended from the first guide wire,
The interval regulating portion includes a first insertion portion through which the first guide wire is inserted, and a second insertion portion through which the second guide wire is inserted,
On the upper surface of the first insertion part, provided with a first guide link inclined structure that is inclined downward as it is separated from the second insertion part,
In the physical quantity measuring method using the physical quantity measuring device provided with the second guide link inclined structure that is inclined downward as it is separated from the first insertion part on the upper surface of the second insertion part ,
After switching the on-off valve portion to be in the non-communication state, after attaching the probe and the weight portion with the probe positioned above the guide link inside the casing,
The guide wire is operated by switching the on-off valve portion to be in the communication state, and operating the winding portion to apply a tensile force to the winding portion in a state where the weight portion is landed on the tank. Fixed,
Thereafter, the physical quantity measuring device that measures the physical quantity of the liquefied natural gas by moving the probe up and down between the suspension portion and the guide link in the tank while being guided along the guide wire. Method of measuring physical quantity using

Images