JP5639754B2 - Displacer recovery device for displacer level gauge - Google Patents

Description

  The present invention provides a displacer type liquid level gauge used for measuring the liquid level of a liquid stored in a storage tank. When a wire connected to a displacer is cut, the displacer with the cut wire is The present invention relates to a displacer recovery device for a displacer type liquid level gauge used for recovery.

  As a kind of liquid level gauge for measuring the liquid level (position of liquid level) in storage tanks of LNG (liquefied natural gas), LPG (liquefied petroleum gas), other liquefied gases, and storage tanks of various liquids, for example A displacer type liquid level gauge having the configuration shown in FIG. 7 is known (see, for example, Patent Document 1).

  The displacer type liquid level gauge I shown in FIG. 7 is provided with a balance driving machine 10 on the upper side of the roof portion 1a of the storage tank 1, and is unwound from a wire drum (not shown) of the balance driving machine 10 and suspended in the storage tank 1. A displacer 12 having a specific gravity greater than that of the stored liquid 4 in the storage tank 1 is attached to the lower end (tip) of the lowered measuring wire 11.

  In the displacer type liquid level gauge I, when the displacer 12 suspended from the length measuring wire 11 is partially immersed in the storage liquid 4 in the storage tank 1, the displacer 12 changes the storage liquid 4 to the storage liquid 4. Buoyancy according to the volume of the submerged part comes to act. Therefore, the tension acting on the length measuring wire 11 that suspends the displacer 12 from the balance driving machine 10 changes with respect to when the displacer 12 is suspended in the air.

  Therefore, the displacer 12 is unwound and unwound by the balance driver 10 in a state in which the tension acting on the length measuring wire 11 is maintained so that the flooding of the displacer 12 is constant. It can be moved up and down accurately following the liquid level of the storage liquid 4. Therefore, when the displacer 12 is lifted and lowered following the liquid level of the storage liquid 4 in this manner, the length of the length measuring wire 11 unwound from the balance driving machine 10 is used to determine whether or not the inside of the storage tank 1 The liquid level of the storage liquid 4 can be measured.

  Further, the displacer type liquid level gauge I avoids the influence on the displacer 12 even when the storage liquid 4 in the storage tank 1 undulates as the storage liquid 4 is received in the storage tank 1. In order to be able to measure the liquid level of the storage liquid 4, a guide pipe 13 extends through the roof portion 1 a of the storage tank 1 to the vicinity of the bottom of the storage tank 1. The displacer 12 is arranged inside (inside) the guide pipe 13. The guide pipe 13 is formed with guide holes 14 at required intervals in the vertical direction so that the liquid level of the stored liquid 4 is the same inside and outside the guide pipe 13.

  Further, a calibration chamber 15 having a maintenance manhole 16 is attached to the upper end portion of the guide pipe 13 via a full-bore gate valve 17, and is attached to a flange 15 a at the upper end portion of the calibration chamber 15. The balance drive machine 10 is attached. The length measuring wire 11 unwound from the balance driving machine 10 passes through the calibration chamber 15 and the gate valve 17 and is connected to the displacer 12 disposed inside the guide pipe 13.

  By the way, in the displacer type liquid level gauge I, when the length measuring wire 11 is cut due to an unexpected situation, the displacement of the displacer 12 cannot be detected, and the liquid level of the stored liquid 4 cannot be measured. Further, when the measuring wire 11 is cut in this way, the displacer 12 sinks to the bottom of the guide pipe 13. In this case, the displacer type liquid level gauge I is not provided with a means for collecting the displaced displacer 12, so that the displacer 12 cannot be collected.

  In addition, when this displacer type liquid level gauge I is provided in a storage tank that is periodically opened and inspected like the LPG storage tank 1, the length measuring wire 11 may be caused by an unexpected situation. Even if it is cut, it is possible to collect the displacer 12 with the length measurement wire 11 cut from the bottom of the guide pipe 13 at the next opening inspection. Therefore, when the period until the next opening inspection is long, the displacer 12 that has been sunk by cutting the length measuring wire 11 is left at the bottom of the guide pipe 13 until the next opening inspection, and the length measuring wire is cut. By connecting 11 to the new displacer 12 as it is or after replacement, the function of the displacer type liquid level gauge I can be recovered and the operation can be continued.

  However, when this displacer-type liquid level gauge I is provided in the LNG storage tank, periodic opening inspection is not performed. Therefore, if the measuring wire 11 is cut due to an unexpected situation, the bottom of the guide pipe 13 There will be no opportunity to collect the displacer 12 that has settled down. Further, when the displacer 12 sunk in the bottom of the guide pipe 13 is left for a long period of time, the broken piece of the measuring wire 11 remaining on the displacer 12 side gradually becomes a pump for discharging LNG from the LNG storage tank. There is also a concern that the suction pump is sucked and a malfunction occurs in the discharge pump.

  Against this background, there has been proposed a displacer collection device that includes means for collecting the displacer 12 in the displacer-type liquid level gauge I having the guide pipe 13 (Patent Document 2). reference). The displacer collection device includes a basket storage portion provided at the lower end side of the guide pipe, the collection basket is stored in the basket storage portion, and a basket holding device capable of holding and releasing the collection basket. It is a thing.

Japanese Utility Model Publication No. 7-20531 JP 2009-14471 A

  However, in the displacer collection device, the basket holding device requires a hanging wire and an operation wire for operating the hook that is locked to the collecting basket and pulls it up. Therefore, it cannot be directly attached to the balance drive machine, and a dedicated temporary winch is required. Therefore, when actually collecting the collection basket, the balance driving machine is once removed and a temporary winch is attached. However, such replacement with a temporary winch is very complicated and an improvement is desired.

  The present invention has been made in view of the above circumstances, and the purpose of the present invention is that when the measuring wire connecting the displacer is cut, it is not necessary to replace the balance drive machine with the temporary winch, It is an object of the present invention to provide a displacer collecting device for a displacer type liquid level gauge that can easily collect a displacer that has sunk.

A displacer recovery device for a displacer-type liquid level gauge according to the present invention comprises a guide pipe that penetrates a roof portion of a storage tank and extends vertically in the storage tank, and is attached to the upper end side of the guide pipe. When a displacer is attached to the tip of the measuring wire that is further unwound, and the displacer is disposed on the liquid level of the stored liquid based on the tension acting on the measuring wire inside the guide pipe with a constant amount of water, The displacer-type liquid level gauge configured to measure the liquid level of the stored liquid in the storage tank based on the length dimension of the measuring wire unwinding from the balance driving machine. provided a basket containing portion at the lower end, accommodating the collecting basket to the basket storage portion, further, measuring unwinding from the balance-machine Attached to ear, it includes a basket holding device which is adapted for holding or withdrawal of the collecting basket,
An opening extending outwardly from the opening to the opening of the collecting basket and covering the gap between the inner wall surface of the basket storage portion and the outer surface of the collecting basket; and the opening An extension part comprising an inner extension part extending inwardly downward from the part,
The basket holding device is attached to the length measuring wire having three or more arms arranged radially in a plan view, and is attached to the arms so as to be rotatable so as to extend the collection basket. An engaging claw provided so as to be engageable with the inner extending portion of the protruding portion , and stopping the rotation of the engaging claw in a state where the engaging claw is engaged with the inner extending portion of the extending portion . And a stopper.

According to this displacer recovery device, the basket holding device has three or more arms arranged radially in plan view, and is attached to a length measuring wire that is unwound from a balance driving machine, An engaging claw that is pivotally attached and is provided inside the extending portion of the collection basket so as to be engageable, and the engaging claw engaged with the extending portion inside the extending portion. And a stopper that stops the rotation of the claw, so that if the measuring wire is cut unexpectedly and the displacer sinks to the bottom of the guide pipe, the balance drive machine is not replaced with a temporary winch. The displacer can be collected by attaching a basket holding device to the measuring wire and lifting the collection basket by the basket holding device.
That is, when the length measuring wire is unexpectedly cut and the displacer sinks to the bottom of the guide pipe, the displacer that has settled is housed in a collection basket housed in the basket housing portion of the guide pipe. Therefore, the basket holding device suspended by operating the balance driving device is lowered, and the engaging claw is locked inside the extending portion of the collection basket, and then the basket holding device is raised. The displacer accommodated in the collection basket can be collected.
In addition, since the engaging claw can be held in a state engaged with the inside of the extending portion by the stopper, when the collection basket is lifted or hung by this basket holding device, the engaging claw rotates unexpectedly. The engagement with the extending portion is prevented from being released.
Furthermore, since the extending portion of the collection basket is extended from the outside to the inside of the opening, the collection wall and the inner wall surface of the basket housing portion are collected while the collection basket is housed in the basket housing portion. Even if there is a gap with the outer surface of the basket for use, the gap can be covered with the outside of the extending portion, and therefore the engagement claw is prevented from unexpectedly fitting into the gap.

Further, in the displacer collection device, the basket holding device has the same posture as the state in which the engaging claw is engaged with the inside of the extending portion even when the engaging claw is not engaged with the inside of the extending portion. The first holding device attached to the arm and the engaging claw are engaged with the inside of the extending portion so that the first holding device and the engaging claw are held in the vertical direction and substantially upright in the vertical direction by rotating. Any one of the second holding device attached to the arm so as to be substantially upright along the vertical direction in a state where the arm is not turned, and to rotate and engage with the inside of the extending portion. It is preferable to have.
The first holding device is held in the same posture as the state in which the engaging claw is not engaged with the inside of the extending portion and engaged with the inside of the extending portion, and rotates. The first holding device is dropped into the opening of the collection basket when the collection basket stored in the basket storage section is lifted, because it is attached to the arm so as to be substantially upright along the vertical direction. Then, by pulling up thereafter, the engaging claw can be easily engaged with the inside of the extending portion. That is, although the engaging claw is held in the same posture as that engaged with the extending portion even in normal times, the engaging claw is substantially upright by rotating, so the first holding device Is dropped into the opening of the collection basket, the engaging claw rotates by contacting the inside of the extending portion and does not interfere with the extending portion. And if it reaches the downward part of an extension part, it will rotate again by the contact | abutting to an extension part being cancelled | released, and comes to engage with the inside of an extension part.

  Further, the second holding device is configured such that the engaging claw is substantially upright along the vertical direction in a state in which the engaging claw is not engaged with the inside of the extending portion, and is rotated and engaged with the inside of the extending portion. Since it is attached to the arm so that it fits, after the collection basket is suspended and stored in the basket storage section, the second holding device is further dropped into the suspended collection basket opening. Thus, the engaging claw engaged with the inside of the extending portion can be easily removed from the extending portion. That is, since the engaging claw is substantially upright in a normal state, the second holding device is inserted into the opening of the collection basket from the state where the engaging claw is engaged with the inside of the extending portion. By further dropping, the engaging claw rotates and is substantially upright and is held in that state. Therefore, by pulling up the second holding device in this state, it is possible to easily remove the second holding device from the collection basket without causing the engaging claw to interfere with the inside of the extending portion.

Moreover, in the displacer recovery apparatus, it is preferable that the basket holding device has both the first holding device and the second holding device.
If it does in this way, lifting of the collection basket accommodated in the basket storage part can be facilitated by using the first holding device. Further, by using the second holding device, it becomes easy to suspend the collection basket and store it in the basket storage portion.

Further, in the displacer recovery device, it is preferable that the outer diameter of the extending portion of the recovery basket is smaller than the inner diameter of the roof penetration portion of the storage tank at the upper end portion of the guide pipe.
In this way, the collection basket stored in the basket storage section can be surely passed through the roof penetration portion of the guide pipe, and therefore, it is more reliable and easy to recover the displacer with the length measurement wire cut. .

Further, in the displacer recovery apparatus, the guide pipe is configured such that the diameter of the roof penetration portion of the storage tank at the upper end of the guide pipe is smaller than the diameter of the portion of the guide pipe located in the storage tank. In addition, it is preferable that the basket storage portion is provided on the lower end side of the guide pipe with a reducer interposed.
In this way, even if the displacer with the length measurement wire cut down sinks to a position displaced from the axial center of the guide pipe, the displacer is guided by the reducer so that the displacer inside the basket storage portion can be recovered. It comes to be securely stored in the basket.

In the displacer recovery system of the displacer type level gauge of the present invention, when the displacer off measuring wire is sinking to the bottom of the guide pipe, without replacing the balance driving machine to a temporary winch, measuring its Since the displacer can be collected by attaching the basket holding device to the long wire and lifting the collection basket with this basket holding device, once the displacer is collected, the balance drive is temporarily removed. Then, complicated work such as attaching a temporary winch is not necessary, and workability can be greatly improved. Further, it is not necessary to provide a temporary winch separately from the balance driving device for collecting the displacer, and therefore, maintenance management of the temporary winch becomes unnecessary, and the cost can be reduced accordingly. Furthermore, the equipment cost required for the temporary winch can be eliminated, and the equipment cost of the entire displacer recovery device can be reduced.
Further, when the collection basket is lifted or suspended, the stopper is prevented from unexpectedly turning the engagement claw and releasing the engagement with the extension portion. Lifting or hanging can be performed more reliably.
In addition, since the engaging claw is prevented from unexpectedly fitting into the gap between the inner wall surface of the basket housing portion and the outer surface of the collecting basket, the extending portion of the collecting basket prevents it. Lifting or hanging can be performed more easily and reliably.

It is a figure which shows one Embodiment of the displacer collection | recovery apparatus of the displacer type liquid level gauge of this invention, (a) is principal part sectional drawing which shows the normal operation state of a displacer liquid level gauge, (b) is collection | recovery of a displacer. It is a principal part sectional side view which shows the state which performs. It is a principal part expanded sectional view which expands and shows the collection | recovery basket and basket holding | maintenance apparatus in the apparatus of FIG. It is a figure which shows schematic structure of a 1st holding | maintenance apparatus, Comprising: (a) is a side view, (b) is a top view, (c) is a principal part enlarged view. It is a figure which shows schematic structure of a 2nd holding | maintenance apparatus, Comprising: (a) is a side view, (b) is a principal part enlarged view. (A), (b) is a side view for demonstrating operation | movement of a 1st holding | maintenance apparatus. (A), (b) is a side view for demonstrating operation | movement of a 2nd holding | maintenance apparatus. It is principal part sectional drawing which shows schematic structure of an example of the displacer collection | recovery apparatus of the conventional displacer type liquid level gauge.

Hereinafter, the displacer collection device of the displacer type liquid level gauge of the present invention will be described in detail.
FIGS. 1A, 1B, and 2 are views showing an embodiment of a displacer recovery device for a displacer type liquid level gauge of the present invention. In these drawings, reference numeral 1 denotes a storage tank. This storage tank 1 stores LNG (liquefied natural gas) 4a as a storage liquid, and has a displacer type liquid level gauge I of the type provided with a guide pipe 13 as in the example shown in FIG. It is. 1A, 1B, and 2, the same components as those in FIG. 7 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 1A, a basket storage portion 21 is formed at the lower end of the guide pipe 13, and a basket 22 for collecting the displacer 12 is stored in the basket storage portion 21. In the displacer type liquid level gauge I, when the length measuring wire 11 of the balance driving machine 10 is cut and the displacer 12 sinks to the bottom of the guide pipe 13, as shown in FIG. A basket holding device (first holding device 24) is provided that collects the displacer 12 by lifting the 22.

  The guide pipe 13 has a portion (a roof penetration portion) 13a that penetrates the roof portion 1a of the storage tank 1 at its upper end portion, which is formed in a relatively small diameter. The part 13b to be formed is formed to have a larger diameter than the roof penetrating part 13a. Thereby, in the roof penetration part 13a of the guide pipe 13, the heat input from the outside into the storage tank 1 is suppressed, and a small gate diameter is used as the gate valve 17 connected to the upper side of the roof penetration part 13a. It is supposed to be.

  In addition, a taper portion 13c that gradually increases in diameter from the upper end side toward the lower end side is provided between the roof penetrating portion 13a of the guide pipe 13 and the portion 13b located in the storage tank 1. Thus, a step in the vertical direction is not formed on the peripheral wall surface of the guide pipe 13.

  Further, at the lower end side of the guide pipe 13, a basket storage portion 21 having the same diameter as the roof penetration portion 13 a or a slightly smaller diameter and a depth corresponding to the height of the collection basket 22. However, they are integrally formed through the reducer 19. The reducer 19 is formed by gradually reducing the diameter from the guide pipe 13 to the basket storage portion 21. As shown in FIG. 2, the basket storage portion 21 has, for example, a cross-shaped bottom portion (not shown) at the lower end portion thereof, and holds the collection basket 22 inserted therein from above. It is like that.

  The collection basket 22 has an outer diameter corresponding to the inner diameter of the basket storage portion 21, that is, an outer diameter slightly smaller than this, and has a height dimension substantially equal to the height of the basket storage portion 21. It has a bottom cylindrical shape. In other words, the collection basket 22 has a cylindrical bottom portion 22b attached to the lower end portion of the cylindrical side wall 22a, thereby allowing the LNG 4a to circulate in the collection basket 22. .

  The collection basket 22 extends from the outside to the inside over the entire circumference in the upper end of the side wall 22a, that is, the opening of the collection basket 22, and from the outside to the inside. The extension part 23 which inclines toward the downward direction is provided. The extending portion 23 includes an outer extending portion 23a that extends outward and obliquely upward from the opening portion, and an inner extending portion 23b that extends obliquely downward and inward from the opening portion. It has become. The outer extending portion 23a and the inner extending portion 23b are integrally formed of a single plate material, and therefore the upper surface thereof is a continuous inclined surface that is inclined downward from the outside to the inside as described above. It has become.

  Further, the extending portion 23 composed of the outer extending portion 23a and the inner extending portion 23b is inclined obliquely downward along the inclined surface formed by the inner wall surface of the reducer 19, and this extension is thereby performed. The protruding portion 23 does not form a large step with the slope of the reducer 19. In particular, the outer extending portion 23a covers the gap between the inner wall surface of the basket housing portion 21 and the outer surface of the collection basket 22, so that the basket holding device unexpectedly enters the gap. It is designed not to fit. Moreover, the engaging claw of the basket holding device is engaged with the inner extending portion 23b from below.

In the present embodiment, the basket holding device includes a first holding device 24 shown in FIG. 3 and a second holding device 25 shown in FIG.
The first holding device 24 is configured to be operable by the balance driving machine 10 via the length measuring wire 11, and has three arms 27 as shown in FIG. And an engaging claw 29 rotatably attached to the arm 27, and a stopper 28 for stopping the rotation of the engaging claw 29.

The attachment 26 is formed by integrally connecting three arms 27 at the respective upper ends, and a through hole 26b attached to the length measuring wire 11 of the balance driving machine 10 is formed in the connection portion 26a. It is a thing.

  The arm 27 includes a plate body 30a inclined so as to descend toward the outside from the connecting portion 26a, a plate body 30b inclined so as to descend toward the inside from the lower end portion of the plate body 30a, and the plate body 30b. And a plate body 30c that hangs down from the lower end. These three arms 27 are made of a lightweight metal such as aluminum, stainless steel, or the like, and are connected to the connecting portion 26a so as to open radially in a plan view. These three arms 27 are arranged at equal intervals in the circumferential direction with respect to the connecting portion 26a. Therefore, as shown in the plan view of FIG. 3B, the angle formed by the adjacent arms 27 is made. However, they are arranged radially in plan view so as to be 120 °. With such a configuration, the three arms 27 can be suspended in a well-balanced manner without tilting to one side when the collection basket 22 is lifted or suspended as will be described later. Of course, the number of arms 27 may be four or more as long as the collection basket 22 can be suspended in a well-balanced manner.

  As shown in FIG. 3 (c), the engaging claw 29 is provided on the outer side of the lower end portion of the plate body 30c, and is made of a plate material formed in a substantially parallelogram shape, and a rotation point 29a on one end side thereof. And is attached to the plate 30c in a rotatable manner. Further, a stopper 28 is provided on the inner side of the lower end portion of the plate body 30c so as to contact the engaging claw 29. The stopper 28 is arranged so that the side 28a on the side of the engaging claw 29 is along the vertical direction and substantially coincides with the center line of the plate 30c.

  Under such a configuration, the engaging claw 29 can be rotated in a range from a position indicated by a solid line in FIG. 3C to a position indicated by a two-dot chain line in FIG. 3C. The outward rotation is stopped by the stopper 28. Further, the engaging claw 29 is arranged such that its rotation point 29a is biased toward the lower end on the stopper 28 side, so that its center of gravity is located outside the rotation point 29a (on the side opposite to the stopper 28), Therefore, at the normal time when no external force is applied to the engaging claw 29, as shown by the solid line in FIG. 3C, the engaging claw 29 falls to the outside and jumps out of the plate 30c. Further, when an external force is applied to the stopper 28 side, it turns inward as shown by a two-dot chain line in FIG. 3C, and comes to fit inside the plate 30c by being substantially upright in the vertical direction. ing. Therefore, with this configuration, the engaging claw 29 is detachably engaged with the inner extending portion 23b of the collection basket 22 by falling to the outside of the plate 30c, particularly by falling outward. ing.

As shown in FIG. 4A, the second holding device 25 is different from the first holding device 24 in the configuration of the engaging claw 31 and the stopper 32. In addition, about another structure, it is the same as the 1st holding | maintenance apparatus 24, Therefore The description is abbreviate | omitted.
As shown in FIG. 4B, the engaging claw 31 of the second holding device 25 is formed longer than the engaging claw 29, and the rotation point 31a is on the upper side. And it is biased and arranged at the lower end outside the plate 30c. On the other hand, the stopper 32 has a lower end portion thereof that is obliquely cut away from the stopper 28, thereby partially eliminating the restriction on the lower end portion side of the engaging claw 31.

  Under such a configuration, the engaging claw 31 can rotate in a range from a position indicated by a solid line in FIG. 4B to a position indicated by a two-dot chain line in FIG. 4B. The outward rotation is stopped by the stopper 32. Further, the engaging claw 31 is arranged such that its pivot point 31a is biased to the upper side and to the lower end outside the plate body 30c, so that its center of gravity is inside the pivot point 29a (on the stopper 28 side). ), And therefore, when the external force is not applied to the engaging claw 29, as shown by a two-dot chain line in FIG. 4 (b), it closes to the inside of the plate body 30c by standing substantially vertically. It is like that. Further, when the lower end side receives an external force toward the stopper 32 side, as shown by the solid line in FIG. 4 (b), the upper end part rotates outward and jumps out of the plate 30c. . Therefore, with this configuration, the engaging claw 31 can be engaged with and disengaged from the inner extending portion 23b of the collection basket 22 particularly when the upper end portion rotates outward and jumps out of the plate body 30c. It comes to match.

  In the first holding device 24 and the second holding device 25, the three arms 27 have outer diameters formed by respective lower end portions (plate bodies 30c), that is, circles passing through these three plate bodies 30c. Is formed to be slightly smaller than the inner diameter of the inner extending portion 23b of the collection basket 22. Under such a configuration, the plate body 30c of the three arms 27 is placed inside the inner extending portion 23b of the collection basket 22 with the engaging claws 29 and 31 rotating and closed inside. It can enter.

  As shown in FIGS. 1A and 1B, a purge gas supply line 40 and a gas discharge line 41 are connected to the calibration chamber 15. Thereby, when opening the maintenance manhole 16 of the calibration chamber 15, the gate valve 17 is closed to disconnect the calibration chamber 15 from the atmosphere inside the storage tank 1, and then the calibration chamber 15 is filled. The vaporized gas of the LNG 4a can be purged to the gas discharge line 41 by a purge gas 42 such as nitrogen gas supplied from the purge gas supply line 40.

  Since the storage liquid in the storage tank 1 is LNG 4a having an extremely low temperature of −162 ° C., the members that come into contact with the LNG 4a such as the basket storage portion 21, the collection basket 22, the basket holding device, etc. are basically stainless steel. It is made of.

  When using the displacer recovery device of the displacer type liquid level gauge having the above-described configuration, as shown in FIG. 1A, the recovery basket 22 is previously placed in the basket storage portion 21 on the lower end side of the guide pipe 13. Keep it in the stowed state. It should be noted that the balance drive unit 10 is attached to the upper side of the calibration chamber 15, and in this state, like the displacer type liquid level gauge I shown in FIG. The liquid level of the LNG 4a in the storage tank 1 is measured based on the amount of unwinding from the balance driving machine 10 of the length measuring wire 11 connected to the displacer 12 arranged on the surface with constant flooding.

  While the displacer type liquid level gauge I is operating in this way, when the length measuring wire 11 is cut due to an unexpected situation, the displacer 12 sinks in the guide pipe 13 and is collected in the basket storage portion 21. In the basket 22 for use, it comes to be accommodated. At that time, since the reducer 19 is provided between the lower end portion of the guide pipe 13 and the basket storage portion 21, even if the displacer 12 sinks at a position off the axial center in the guide pipe 13. The displacer 12 is guided by the reducer 19 so that the displacer 12 is surely accommodated in the collection basket 22 inside the basket storage portion 21.

On the other hand, if the length measuring wire 11 is cut in this way, the tension due to the weight of the displacer 12 does not act on the length measuring wire 11 that is unwound from the balance driving device 10. The cutting of the long wire 11 is easily detected.
When the cutting of the length measuring wire 11 is detected in this way, first, all the length measuring wires 11 unwound from the balance driving device 10 are wound up to the balance driving device 10 side.
Next, after closing the gate valve 17, the vaporized gas of the LNG 4a filled in the calibration chamber 15 is purged.

Next, the maintenance manhole 16 is opened, and the first holding device 24 of the basket holding device is attached to the lower end portion (tip portion) of the length measuring wire 11 wound up earlier. Note that the first holding device 24 is attached to the length measuring wire 11 by, for example, providing an appropriate hook member on the length measuring wire 11 and hooking it to the through hole 26 b of the fixture 26.

  When the first holding device 24 is attached in this way, the maintenance manhole 16 is closed, and the gate valve 17 is further opened. Then, the length measuring wire 11 is unwound from the balance driver 10 again, and the first holding device is 24 is lowered to the inside of the collection basket 22 at the lower end of the guide pipe 13. Then, the engaging claw 29 can be rotated, and the three arms 27 are formed so that the outer diameter thereof is substantially equal to the inner diameter of the inner extending portion 23 b of the collection basket 22. The lower end portion of the holding device 24 easily enters the inside extension portion 23 b of the collection basket 22.

  That is, when the first holding device 24 is dropped into the opening of the collection basket 22, the engaging claws 29 are opened outward as shown by the solid line in FIG. By abutting against the inner extension 23b, the inner extension 23b rotates inward as shown in FIG. When further lowered, the engaging claw 29 is substantially upright as shown by a two-dot chain line in FIG. 3C, and this is not interfered with the inner extending portion 23b. It enters into the opening of the collection basket 22. Then, the engagement claw 29 is released from the contact with the inner extending portion 23b and is rotated outward by its own weight to open outward. Therefore, when the 1st holding | maintenance apparatus 24 is pulled up after that, as shown in FIG.5 (b), the engagement nail | claw 29 engages with the inner surface side of the inner side extension part 23b from the downward direction.

  Here, since the gap between the inner wall surface of the basket housing portion 21 and the outer surface of the collection basket 22 is covered with the outer extending portion 23a, when the first holding device 24 is lowered, this is described above. It is designed not to accidentally fit into the gap.

  When the engaging claw 29 is engaged with the inner extending portion 23b in this way, the length measuring wire 11 unwound by the balance driving machine 10 is wound up again while maintaining the state. Thereby, the collection basket 22 can be pulled up, and therefore the displacer 12 accommodated therein can be collected. That is, when the collected recovery basket 22 reaches the calibration chamber 15, the balance driver 10 is stopped and the gate valve 17 is closed. Then, after purging the vaporized gas of LNG 4a in the calibration chamber 15, the maintenance manhole 16 is opened, and the displacer 12 accommodated in the lifted collection basket 22 is collected.

  When the displacer 12 is collected in this manner, the collection basket 22 is first removed from the first holding device 24 in order to replace the basket holding device from the first holding device 24 to the second holding device 25. Subsequently, the second holding device 25 is attached to the length measuring wire 11 as in the case of the first holding device 24, and the collection basket 22 is suspended by the second holding device 25. At this time, the engaging claws 31 of the second holding device 25 are closed by rotating their upper ends inwardly as indicated by a two-dot chain line in FIG. After the nail 31 is once dropped into the opening of the collection basket 22, the collection basket 22 and the second holding device 25 are turned upside down. Then, since the center of gravity of the engaging claw 31 is biased, its upper end portion (which is on the lower side by being overturned) rotates outward as shown by the solid line in FIG. As a result, the inner extending portion 23b of the collection basket 22 can be engaged.

  Therefore, after engaging these engaging claws 31 with the inner extending portion 23b, the collection basket 22 and the second holding device 25 are overturned again and placed in the original state, so that the second holding The collection basket 22 is suspended by the device 25. When the collection basket 22 is suspended as described above, the maintenance manhole 16 is closed and the gate valve 17 is opened to store the collection basket 22 in the basket storage portion 21 again.

  Subsequently, the length measuring wire 11 wound up by the balance driving machine 10 is unwound again, and the second holding device 25 is lowered. As a result, the collection basket 22 suspended from the second holding device 25 is stored in the basket storage portion 21 as shown in FIG. Then, after the collection basket 22 reaches the bottom of the basket storage portion 21, the second holding device 25 is further lowered and dropped into the basket storage portion 21.

  Then, the engagement claw 31 is disengaged from the inner extension 23b of the collection basket 22, and the engagement claw 31 is rotated substantially as shown in FIG. Is done. Therefore, by pulling up the second holding device 25 under this state, the second engaging device 25 can be removed from the collecting basket 21 without causing the engaging claw 31 to interfere with the inner extending portion 23b as shown in FIG. The two holding devices 25 can be easily removed.

  Therefore, when the second holding device 25 is removed from the collection basket 21 in this way, the length measuring wire 11 is again wound up by the balance driving machine 10, and then the gate valve 17, the maintenance manhole 16 and the like are operated. Then, the second holding device 25 is removed from the measuring wire 11 in the calibration chamber 15.

  Thereafter, the previously collected displacer 12 is attached to the length measuring wire 11, and in that state, the length measuring wire 11 is unwound again by the balance driving device 10, and the displacer 12 is lowered to the liquid level of the LNG 4a. Hold. Thereby, the function of the displacer type liquid level gauge I can be recovered.

In such a displacer recovery device of the displacer type liquid level gauge I, when the length measuring wire 11 is cut and the displacer 12 sinks to the bottom of the guide pipe 13, the balance driver 10 is replaced with a temporary winch. Without attaching the first holding device 24 as a basket holding device to the measuring wire 11 and lifting the collection basket 22 by the first holding device 24, the displacer 12 can be collected. Therefore, when recovering the displacer 12 as in the prior art, a complicated operation such as once removing the balance driving device 10 and then attaching a temporary winch is unnecessary, and the workability can be greatly improved. Further, it is not necessary to provide a temporary winch separately from the balance drive unit 10 for collecting the displacer 12, so that maintenance management of the temporary winch becomes unnecessary, and the cost can be reduced accordingly. Furthermore, the equipment cost required for the temporary winch can be eliminated, and the equipment cost of the entire displacer recovery device can be reduced.

  In addition to the first holding device 24, a second holding device 25 is prepared as a basket holding device. When the disposer 12 is collected and the collection basket 22 is stored in the basket storage portion 21, the first holding device is used. Since the second holding device 25 is used in place of the device 24, the functions of both the first holding device 24 and the second holding device 25 as the basket holding device are simplified and the configuration is simple. This makes it particularly possible to reduce the weight. Therefore, the load on the balance driving machine 10 is reduced, and the displacer 12 can be recovered without difficulty by the balance driving machine 10.

Further, when the collection basket 22 is lifted or hung, the stoppers 28 (32) may cause the engagement claws 29 (31) to rotate unexpectedly and disengage from the inner extension 23b. Therefore, the collection basket 22 can be lifted or hung more reliably.
Further, the outer extending portion 23 a of the collection basket 22 prevents the engaging claw 29 (31) from unexpectedly fitting into the gap between the inner wall surface of the basket housing portion 21 and the outer surface of the collection basket 22. Therefore, the collection basket 22 can be lifted or hung more easily and reliably.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably. For example, the sizes of the displacer 12, the guide pipe 13, the basket storage portion 21, and the collection basket 22 are not limited to the illustrated sizes, and may be appropriately determined according to the actual size of the storage tank 1 and the properties of the liquid to be stored. Can be changed. In addition, regarding the material of each of the above members, a material other than stainless steel can be adopted depending on the properties of the liquid to be stored.

  In addition, the displacer recovery apparatus of the present invention is suitable for use as a displacer recovery apparatus when a displacer type liquid level gauge having a guide pipe 13 is installed in the storage tank 1 of the LNG 4a. The present invention may be applied to a displacer type liquid level gauge I installed in a storage tank 1 for storing liquid.

  In addition, with respect to the collection basket 22, when stored or held in the basket holding device, the stored liquid such as LNG 4a can be flowed so as not to cause a large resistance and the length measuring wire 11 can be flown. If the length of the measuring wire 11 attached to the displacer 12 that sinks into the collection basket 22 when it is cut does not pass easily, the bottom 22b has a structure other than a mesh such as punching metal. Further, the side wall 22a may have the same structure as the bottom 22b.

  In addition, the collection basket 22 is prevented from being tilted or swung like a pendulum when the collection basket 22 is lifted or suspended while being held in the basket holding device. Alternatively, a balance weight may be provided in the basket holding device.

  DESCRIPTION OF SYMBOLS 1 ... Storage tank, 1a ... Roof part, 4a ... LNG (storage liquid), 10 ... Balance drive machine, 11 ... Measuring wire, 12 ... Displacer, 13 ... Guide pipe, 13a ... Roof penetration part, 13b ... In storage tank 16 ... Maintenance manhole, 17 ... Gate valve, 19 ... Reducer, 21 ... Basket storage part, 22 ... Collection basket, 23 ... Extension part, 23a ... Outer extension part, 23b ... Inner extension 24, first holding device (basket holding device), 25 ... second holding device (basket holding device), 26 ... fixture, 27 ... arm, 28 ... stopper, 29 ... engagement claw, 31 ... engagement Claws, 32 ... stopper

Claims (5)

A guide pipe that penetrates the roof of the storage tank and extends in the vertical direction in the storage tank is provided, and a displacer is attached to the tip of the length measuring wire that is unwound from the balance drive attached to the upper end of the guide pipe. The displacer is unwound from the balance driving machine when the displacer is placed on the liquid surface of the stored liquid with constant flooding based on the tension acting on the length measuring wire inside the guide pipe. A displacer type level gauge configured to measure the liquid level of the storage liquid in the storage tank based on the length dimension is provided with a basket storage portion on the lower end side of the guide pipe, and the basket storage portion the recovered basket housed, further attached to a measuring wire unwinding from the balanced driving machine, holding or withdrawal of the collecting basket It includes a basket holding device to perform,
An opening extending outwardly from the opening to the opening of the collecting basket and covering the gap between the inner wall surface of the basket storage portion and the outer surface of the collecting basket; and the opening An extension part comprising an inner extension part extending inwardly downward from the part,
The basket holding device is attached to the length measuring wire having three or more arms arranged radially in a plan view, and is attached to the arms so as to be rotatable so as to extend the collection basket. An engaging claw provided so as to be engageable with the inner extending portion of the protruding portion , and stopping the rotation of the engaging claw in a state where the engaging claw is engaged with the inner extending portion of the extending portion . A displacer recovery device for a displacer type liquid level gauge, characterized by comprising a stopper. The basket holding device holds the engaging claw is in the same position as the state engaged with the inner extending portion of the extending portion even when not engaged with the inner extending portion of the extending portion And a first holding device attached to the arm so as to be substantially upright along the vertical direction by rotating,
The engaging claw is substantially upright along the vertical direction in a state where the engaging claw is not engaged with the inner extending portion of the extending portion , and rotates to engage with the inner extending portion of the extending portion . The displacer recovery device for a displacer-type liquid level gauge according to claim 1, further comprising: a second holding device attached to the arm.   3. The displacer recovery device for a displacer type liquid level gauge according to claim 2, wherein the basket holding device includes both the first holding device and the second holding device.   The outer diameter of the extending portion of the collection basket is set to be smaller than the inner diameter of the roof penetration portion of the storage tank at the upper end portion of the guide pipe. Displacer collection device for the displacer type liquid level gauge as described in the section.   The guide pipe is configured such that the diameter of the roof penetration portion of the storage tank at the upper end of the guide pipe is smaller than the diameter of the portion of the guide pipe located in the storage tank, and the lower end of the guide pipe 5. The displacer recovery device for a displacer type liquid level gauge according to claim 4, wherein the basket storage portion is provided on the side with a reducer interposed.

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