JP2017132619A - Pump lifting device and pump lifting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device for an LNG pump capable of reducing facility cost by adopting a manual winch as one of two winches and using a structure that is lighter than a jib crane and can be manufactured inexpensively, and a lifting method for the LNG pump.SOLUTION: An LNG pump lifting device (10) installed on a roof (2) of an LNG storage tank includes: a vertical column member (12) extending vertically by predetermined length; a beam member (13) having one end portion fixed to an upper portion of the column member (12) and protruding horizontally; a power-driven type winch (15) provided in the column member (12); a manually-driven type winch (16) provided in the column member (12); and a plurality of pulleys (17, 18, 19) provided in the beam member (13) to guide a plurality of lifting wires (4a, 4b) extending from the LNG pump (1) and connected to the power-driven type winch (15) and the manually-driven type winch (16).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pump lifting device and a pump lifting method installed on the roof of a storage tank.

  The LNG tank is equipped with an LNG pump for sucking LNG from the underground LNG tank or the above ground LNG tank and supplying it to the LNG supply system. The LNG pump is installed near the bottom of a vertical conduit-like pump barrel that extends through the roof of the LNG tank to the bottom of the tank.

  If the LNG pump breaks down, it seriously hinders the supply of LNG to the LNG consumption side. Therefore, the LNG pump needs to be maintained and inspected every predetermined operation time (for example, 8000 hours). Therefore, the LNG tank roof is equipped with an LNG pump lifting device for lifting and removing the LNG pump from the LNG tank.

  In the pump barrel, two wires connected to the LNG pump are extended to near the upper end. When the LNG pump is lifted, the two hoisting devices such as two hoists and winches are driven synchronously. Normally, the LNG pump is taken out from the upper end of the pump barrel by winding the wire at a constant speed. Two wires are preferred rather than lifting the LNG pump with one wire.

  In the LNG pump lifting device described in Patent Document 1, two hoists are provided on a jib that can turn around a vertical axis so as to be movable in the horizontal direction.

JP 2014-227255 A

  In consideration of safety, the conventional LNG pump lifting device is equipped with two hoisting devices for hoisting with two wires, and the two hoisting devices are driven synchronously when the LNG pump is hoisted. In this case, the equipment cost of the two hoisting devices and the drive control device that drives them synchronously becomes high. Therefore, it is conceivable to equip two manual hoisting devices in place of the two hoisting devices. However, when the LNG pump is lifted by the two manual hoisting devices, it is too inefficient and increases the burden on the operator. .

  Moreover, in the LNG pump lifting device of Patent Document 1, since two hoists are provided on a pivotable jib so as to be movable in the horizontal direction, the total weight of the LNG pump lifting device is increased, and the equipment cost is also increased.

  An object of the present invention is to provide a lifting device for an LNG pump and a lifting method for an LNG pump, which can reduce equipment costs.

The pump lifting device according to claim 1 is a pump lifting device installed on the roof of the storage tank.
A vertical column member extending a predetermined length in the vertical direction, a power drive winch equipped in the column member, a manual drive winch equipped in the column member, and a power extending from a pump housed in a pump barrel. A drive winch and a plurality of pulleys for guiding a plurality of wires connected to the manual drive winch are provided.

A pump lifting device according to a second aspect of the present invention includes, in the first aspect of the invention, a turning support mechanism that supports the column member so that the column member can turn about a vertical axis manually. It is characterized by that.

  According to a third aspect of the present invention, there is provided a pump lifting apparatus including the beam member fixed to the column member and projecting in a horizontal direction, wherein at least a part of the plurality of pulleys is mounted on the beam member. It is characterized by being.

A pump lifting device according to a fourth aspect is the invention according to the third aspect, wherein a plurality of mounting brackets to which the pulley can be attached are provided at a plurality of portions of the beam member.

According to a fifth aspect of the present invention, there is provided the pump lifting apparatus according to the second aspect, wherein two sliding plates having low friction are provided on the sliding portion of the swivel support mechanism.

7. The pump lifting method according to claim 6, wherein the pump is lifted by using a pump lifting device installed on the roof of the storage tank, and the first wire is wound by the power driven winch of the pump lifting device. A first step of lifting the pump housed in
The pump lifting device has a second step of eliminating looseness of the second wire connected to the pump independently of the first wire by a manually driven winch.

Since the invention of the present application has the configuration described in the section of the problem solving means, the following effects are achieved.
According to the first aspect of the present invention, a vertical column member, a power-driven winch and a manual-drive winch mounted on the column member, and a plurality extending from the pump and coupled to the power-drive winch and the manual-drive winch are connected. A plurality of pulleys that guide the wire of the wire, so that the slack of the wire extending from the pump and connected to the manually driven winch can be lifted by the manually driven winch while the pump is lifted through the wire by the power driven winch. Can be resolved.

  Therefore, since one of the two winches employs a manually driven winch that is less expensive than a power driven winch, and the drive control device for synchronously driving the two winches can be omitted, the equipment cost is reduced. Can be reduced.

  According to the invention of claim 2, since the turning support mechanism that supports the column member so as to be turnable so that the column member can be turned around the vertical axis by manual operation is provided, it is less expensive than the electric turning device. The column member can be swung manually by a swivel support mechanism that can be manufactured.

  According to the invention of claim 3, since the beam member that protrudes in the horizontal direction from the column member is provided and at least a part of the plurality of pulleys is mounted on the beam member, the pump can be lifted smoothly. it can.

  According to the invention of claim 4, since the plurality of mounting brackets to which the pulley can be attached are provided at a plurality of portions of the beam member, the position of the wire can be changed by replacing the plurality of pulleys. There is no need to equip the carriage.

  According to the fifth aspect of the present invention, since the sliding portion of the turning support mechanism is provided with two low friction sliding plates, the friction resistance of the sliding portion is reduced and the column member is turned manually. The load can be reduced.

  According to the sixth aspect of the present invention, the LNG pump is lifted through the first wire by the power driven winch and the pump is lifted by the power driven winch so as to eliminate the slack of the second wire by the manually driven winch. The slack of the second wire can be eliminated by sequentially winding with the manually driven winch while performing with the winch. Therefore, the pump can be efficiently lifted, and the load on the manually driven winch can be greatly reduced.

It is a side view of the LNG pump lifting device concerning the example of the present invention. It is explanatory drawing which shows arrangement | positioning of three pump barrels and a LNG pump lifting device. It is state explanatory drawing of the LNG pump lifting apparatus before work start. It is explanatory drawing of the state which lifted the holding volt | bolt and closed the foot valve. It is explanatory drawing of the state which lifts an LNG pump and a head plate to predetermined height. It is explanatory drawing of the state which unraveled the lifting wire from the head plate and put the head plate on the temporary placing stand. It is explanatory drawing of the preparation state which connected the lifting wire to the pump lifting device. It is explanatory drawing of the state which winds up an air inch and removes a support plate. It is explanatory drawing of the state just before starting winding up with an air inch. It is explanatory drawing of the state which the lower support metal fitting reached the pump barrel upper end. It is explanatory drawing of the state which isolate | separated the lifting wire from the lower support metal fitting, and was suspended with the crane from the ground. It is state explanatory drawing of the LNG pump lifting device at the time of completion of work.

  Hereinafter, an LNG pump lifting device (referred to as a pump lifting device) and an LNG pump lifting method according to an embodiment of the present invention will be described.

  As shown in FIG. 1, the LNG pump 1 is mounted near the bottom in a vertical conduit-like pump barrel 3 that extends through the roof 2 of the LNG tank to the bottom of the tank. However, the LNG pump 1 in FIG. 1 shows a state in which it is lifted to near the upper end of the pump barrel 3.

  The first and second lifting wires 4a and 4b for lifting the LNG pump 1 have lower ends connected to the LNG pump 1 and extending upward in the pump barrel 3, and the first and second lifting wires 4a, 4b The upper end side predetermined length part of 4b is being fixed to the back surface side of the head plate 5 (refer FIG. 3) fixed to the upper end of the pump barrel 3 so that attachment or detachment was possible. Cables 6 (see FIG. 9) such as power cables and instrument cables are also introduced into the pump barrel 3 through the head plate 5 and connected to the LNG pump 1.

  As shown in FIG. 1, the pump lifting device 10 is mounted on the upper surface of the roof 2 of the LNG tank. For example, as shown in FIG. 2, when the three pump barrels 3a, 3b, 3c are arranged at the vertices of an equilateral triangle in plan view, the column member 12 of the pump lifting device 10 is the center of the equilateral triangle. The LNG pump 1 installed in the three pump barrels 3a, 3b, 3c can be individually lifted by using one set of the LNG pump lifting device 10 of this embodiment. ing. However, the arrangement of the plurality of pump barrels is not limited to the above, and various arrangements can be adopted.

  The pump lifting device 10 includes a work deck 11, a vertical column member 12, a beam member 13 fixed to the upper part of the column member 12, and a swing support that rotatably supports a predetermined portion on the lower end side of the column member 12. A mechanism 14, a power drive winch 15 and a manual drive winch 16 mounted on the column member 12, a plurality of pulleys 17 to 19 mounted on the beam member 13, a movable work table 20, and the like are provided. .

The work deck 11 is horizontally constructed near the upper part of the roof 2 of the LNG storage tank, and is supported by the roof 2. An upper end portion of the pump barrel 3 penetrates the work deck 11 and protrudes upward by a predetermined length.
The column member 12 is formed of a steel cylindrical member having a sufficient length in a circular cross section, and is disposed in a penetrating manner on the work deck 11, and most of the column member 12 extends above the work deck 11, and has a lower end side. The predetermined portion 12a is supported by the turning support mechanism 14 so as to freely turn.

  The turning support mechanism 14 supports the column member 12 so that the column member 12 can turn around the vertical axis manually. The turning support mechanism 14 is a fixed-side outer cylinder member 14a having a predetermined length mounted on the roof 2 in a vertical posture, and is fixed so that the lower end-side predetermined portion 12a of the column member 12 is internally fitted and can be turned freely. A side outer cylinder member 14a is provided. The fixed-side outer cylinder member 14 a is fixed to a support column 21 provided in the vicinity thereof via an upper end side bracket 22 and a lower end side bracket 23. The support column 21 is vertically provided at the intersection of the roof bone (not shown) of the roof 2 and supported by the roof bone, and the upper end portion is fixed to the work deck 11.

  A predetermined portion 12a on the lower end side of the column member 12 is fitted into the fixed outer cylinder member 14a with a slight sliding gap, and the column member 12 is placed on the rotary sliding portion at the bottom of the fixed outer cylinder member 14a. A low-friction sliding plate 14b (made of synthetic resin and having a friction coefficient of 0.1 to 0.3) is provided in a two-ply structure that is pivotably supported. However, a thrust bearing may be employed instead of the sliding plate 14b.

 One hole 24 is formed in the middle of the column member 12 in the height direction above the work deck 11, and a base end portion of a rod-shaped handle member (not shown) is detachably inserted into the hole 24. Therefore, the column member 12 is manually turned by the handle member.

  The beam member 13 is made of a steel beam material (for example, I-shaped steel or H-shaped steel) having a predetermined length in the horizontal direction. The beam member 13 is arranged in a horizontal posture at a position slightly lower than the upper end of the column member 12. One end portion is fixed to the column member 12, and the outer end portion of the beam member 13 and the upper end portion of the column member 12 are connected by an inclined member 13a.

Next, the power drive winch 15 and the manual drive winch 16 will be described.
In the present embodiment, an air-driven air winch 15 is employed as the power-driven winch 15, but nitrogen, steam, or the like other than air may be employed as the driving medium, or an electric winch may be employed. The air inch 15 is mounted on a mounting base 25 fixed to the column member 12 at a height position close to the work deck 11. The air inch 15 is disposed on the same side as the side on which the beam member 13 extends with respect to the column member 12. Of course, the air winch 15 and the manually driven winch 16 are not limited to the above arrangement, and may be arranged at positions suitable for work.

An air regulator 27 including an air pressure regulator is disposed below the mounting base 25, and an air hose 28 for supplying pressurized air is connected to the air regulator 27.
The manually driven winch 16 is mounted on a mounting base 26 fixed to the column member 12 at a position above the air winch 15. The manually driven winch 16 is disposed at a side portion (on the front side of the paper) that is closer to the column member 12 than the side on which the beam member 13 extends. An operator goes up to the stepping platform 29 and performs a winding operation on the manually driven winch 16 and a rewinding operation.

Next, the pulleys 17 to 19 will be described.
In the vicinity of the column member 12, two first and second mounting brackets 17a and 18a are fixedly provided on the lower surface of the beam member 13, and the first and second mounting brackets 17a and 18a are connected to the first and first mounting brackets 17a and 18a, respectively. The first and second pulleys 17 and 18 are connected to each other via the two connecting fittings 17b and 18b. A plurality of third mounting brackets 19a are fixedly provided on the lower surface of the beam member 13 in the middle of the beam member 13 and in the vicinity of the distal end, and any two of the third mounting brackets 19a are connected to the third connecting bracket 19b. The 3rd pulley 19 is connected via.

  When the LNG pump 1 is lifted, the first lifting wire 4a extending from the LNG pump 1 is connected to the drum of the air winch 15 via the third pulley 19 and the first pulley 17 so as to be wound up. A second lifting wire 4b extending from 1 is connected via a third pulley 19 and a second pulley 18 so as to be rewound by a drum of a manually driven winch 16.

Next, the work table 20 will be described.
The work table 20 includes a gantry 20a having a triangular shape in a side view and a front view shown in FIG. 1 and four idler wheels 20b at the lower end of the gantry 20a, and is movable on the work deck 11. The gantry 20a has a trap and an upper stage, and an operator can stand on the stage and work on the first to third pulleys 17-19.

  Next, a method for lifting the LNG pump 1 using the pump lifting device 10 and the ground crane 30 will be described with reference to FIGS.

FIG. 3 shows the pump barrel 3 and the pump lifting device 10 before starting the lifting operation.
The LNG pump 1 is located at the bottom of the pump barrel 3, and the first and second lifting wires 4 a and 4 b connected to the LNG pump 1 extend upward from the LNG pump 1, and wrap around the inner surface of the head plate 5. It is fixed in a state. A support wire 31 connected to the LNG pump 1 extends to an upper portion in the pump barrel 3, and a holding bolt 33 is connected to an upper end of the support wire 31 via a support fitting 32. The holding bolt 33 is connected to the head plate 5. And protrudes upward.

Next, as shown in FIG. 4, an eye bolt 35 (suspension ring) is screwed onto the upper end of the holding bolt 33, a weight scale 36 is connected to the eye bolt 35, and the sling wire 37 extended from the hook 30 a of the crane 30 is weighted. Connect to a total of 36 hooks.
Next, when the hook 30a of the crane 30 is wound up by a predetermined length and the LNG pump 1 is raised, the foot valve 38 at the lower end of the pump barrel 3 is closed. Next, a clamp holding rod 39 (see FIG. 5) serving as a spacer is externally fitted to the holding bolt 33 between the ring member 33a fixed to the middle portion of the holding bolt 33 and the head plate 5, whereby the LNG pump 1 Is supported by the head plate 5 and the pump barrel 3.

  Next, pressurized nitrogen gas is supplied to a nitrogen gas supply pipe connected to the upper part of the pump barrel 3, and the LNG in the pump barrel 3 is pushed out from the foot valve 38 into the tank (inside LNG). After filling the inside with nitrogen gas, the foot valve 38 is switched to the closed state. Next, the inside of the pump barrel 3 is depressurized to atmospheric pressure by extracting a part of the nitrogen gas from the nitrogen gas supply pipe.

  Next, as shown in FIG. 5, the sling wire 37 of the crane 30 is connected to the head plate 5, and the head plate 5 and the LNG pump 1 are lifted by a predetermined distance by the crane 30, and cables such as a power cable and an instrument cable are used. 6 is wound around the cable reel 41.

  Next, as shown in FIG. 6, when the LNG pump 1 is further raised and the support fitting 32 reaches the position of the upper end of the pump barrel 3, a support plate 42 with a slit is placed on the upper end of the pump barrel 3. Then, the pin member is inserted through the hole of the support metal fitting 32 on the upper side of the support plate 42 and supported by the support plate 42, so that the load of the LNG pump 1 is supported by the support plate 42 and the pump barrel 3. To do.

  Next, the upper end side predetermined length portion of the first and second lifting wires 4a, 4b is unwound from the head plate 5, the lower end portion of the holding bolt 33 is separated from the upper end of the support fitting 32, and the head plate 5 and its accessories. Is placed on the temporary table 44.

  Next, as shown in FIG. 7, the upper end portion of the first lifting wire 4a is connected to the drum of the air winch 15 via the third pulley 19 and the first pulley 17 so that the air winch 15 can be wound. Is driven to bring the first lifting wire 4a into a slack-free state. Further, the upper end portion of the second lifting wire 4b is connected to the drum of the manually driven winch 16 via the third pulley 19 and the second pulley 18 so as to be rewound, and the manually driven winch 16 is driven to drive the second lifting wire 4b. 2 Set the lifting wire 4b to be in a state without slack.

As shown in FIGS. 8 and 9, the air winch 15 is slightly driven, and the support plate 42 is removed after the load of the LNG pump 1 is supported by the first lifting wire 4 a.
Then, after removing the support plate 42, the air winch 15 winds the first lifting wire 4a (first step), and follows the winding of the second lifting wire 4b on the manually driven winch 16 side. The LNG pump 1 is lifted by repeating the elimination of the slack of the second lifting wire 4b (second step).

  When the plurality of cable clamps 45 are removed during lifting, only the first and second lifting wires 4 a and 4 b are separated, and the cables 6 such as the power cable and the instrument cable and the support wire 31 are wound around the cable reel 45. To go.

  Next, as shown in FIG. 10, a lower support fitting 46 that connects the lower ends of the support wire 31 and the first and second lifting wires 4 a and 4 b to the upper end portion of the LNG pump 1 is formed on the flange portion at the upper end of the pump barrel 3. When the support plate 42 is reached, the support plate 42 is attached again, and the pin member 47 is inserted into the pin hole of the lower support fitting 46 on the upper side of the support plate 42, so that the load of the LNG pump 1 is lowered between the lower support fitting 46 and the pin member 47. Through the support plate 42 and the pump barrel 3.

  Next, as shown in FIG. 11, the first and second lifting wires 4 a and 4 b are separated from the lower support fitting 46, and the lower end portion of the slinging wire 37 of the crane 30 is connected to the lower support fitting 46 to connect the LNG pump 1. Then, the support plate 42 and the pin member 47 are removed, and the LNG pump 1 is accommodated in the dry pot 48 mounted on the roof 2 for a predetermined time. After the temperature rises to near normal temperature, the LNG pump 1 is suspended to a predetermined position on the ground by the crane 30. FIG. 12 shows a state where the lifting work of the LNG pump 1 is completed.

  Using the crane 30 and the pump lifting device 10, the crane 30 and the pump lifting device 10 are mounted in the pump barrel 3 in a procedure almost opposite to the lifting operation.

Next, the operation and effect of the pump lifting device 10 and the pump lifting method will be described.
Vertical column member 12, beam member 13, air winch 15 and manually driven winch 16 mounted on column member 12, and mounted on beam member 13 and extending from LNG pump 1, air winch 15 and manually driven type Since the first to third pulleys 17 to 19 for guiding the first and second lifting wires 4a and 4b respectively connected to the winch 16 are provided, the LNG pump is connected to the air winch 15 via the first lifting wire 4a. The slack of the second lifting wire 4b can be eliminated by the manually driven winch 16 while lifting 1.

  Therefore, in order to adopt the manually driven winch 16 that is lighter and cheaper than the power driven winch 15 in one of the two winches 15 and 16, and to drive the two winches 15 and 16 synchronously. The drive control device can be omitted, and the equipment cost can be reduced.

  Since the turning support mechanism 14 that supports the column member 12 so that the column member 12 can turn about the vertical axis by manual operation is provided, the turning support that is lighter and cheaper than the electric turning device can be manufactured. The column member 12 can be turned by manual operation via the mechanism 14. The swivel support mechanism 14 includes a fixed outer cylinder member 14a having a predetermined length that fits in a predetermined portion on the lower end side of the column member 12 and can be swung freely. Therefore, the swivel support mechanism 14 can be manufactured with a simple structure at low cost. It becomes the turning support mechanism 14.

  The handle member can be inserted into a hole 24 formed in the middle of the column member 12 in the height direction, and the column member 12 can be turned by the handle member. Since the two-layered low-friction sliding plate 14b that rotatably supports the column member 12 is provided at the bottom sliding portion in the fixed outer cylinder member 14a, the column member 12 can be rotated with a light force.

  According to the method for lifting the LNG pump, the first lifting wire 4a extending from the LNG pump 1 is connected to the air winch 15 in advance so as to be able to be wound, and the second lifting wire 4b extending from the LNG pump 1 is connected to the manually driven winch. 16, the LNG pump 1 is lifted via the first lifting wire 4 a by the air winch 15 in the first step, and the second lifting wire 4 b is lifted by the manually driven winch 16 in the second step. Since the LNG pump 1 is lifted by repeating the loosening, the slack of the second lifting wire 4b can be eliminated by the manually driven winch 16 while the LNG pump 1 is lifted by the air winch 15. . Therefore, the LNG pump 1 can be efficiently lifted and the load on the manually driven winch 16 can be greatly reduced.

  In the second step, the LNG pump 1 is lifted by the air winch 15 via the first lifting wire 4a, and the looseness of the second lifting wire 4b is eliminated by the manually driven winch 16, so that the second lifting wire 4b is loosened. The slackness of the second lifting wire 4b can be eliminated so as not to become excessive.

Next, a modified example in which the embodiment is partially modified will be described.
(1) In the structure of the pump lifting device 10, the support column 21 may be used also as the fixed outer cylinder member 14a.
(2) The arrangement of the dry pot 48 and the pump lifting device 10 is not limited to the above arrangement.

(3) The pump lifting device 10 can be applied not only to an above-ground LNG tank, but also to an underground LNG tank, and can also be applied to an LPG tank and other storage tanks.
(4) In addition, those skilled in the art can implement the present invention by adding various modifications to the above-described embodiments, and the present invention includes such modifications.

DESCRIPTION OF SYMBOLS 1 LNG pump 3 Pump barrel 4a, 4b 1st, 2nd lifting wire 10 LNG pump lifting device 12 Column member 13 Beam member 14 Turning support mechanism 14a Fixed side outer cylinder member 14b Sliding plate 15 Power drive winch (air winch)
16 Manually driven winch 17-19 First to third pulley 24 hole

Claims (6)

In the pump lifting device installed on the roof of the storage tank,
A vertical column member extending a predetermined length in the vertical direction;
A power-driven winch equipped with the column member;
A manually driven winch mounted on the column member;
A pump lifting device comprising: a power-driven winch extending from a pump housed in a pump barrel; and a plurality of pulleys for guiding a plurality of wires connected to a manually-driven winch.   The pump lifting device according to claim 1, further comprising a turning support mechanism that rotatably supports the column member so that the column member can be turned about a vertical axis by manual operation.   The pump lifting device according to claim 1, further comprising a beam member fixed to the column member and projecting in a horizontal direction, wherein at least a part of the plurality of pulleys is mounted on the beam member. .   The pump lifting device according to claim 3, wherein a plurality of mounting brackets to which the pulley can be attached are provided at a plurality of portions of the beam member.   The pump lifting device according to claim 2, wherein two sliding plates with low friction are provided on the sliding portion of the swivel support mechanism. In the method of lifting the pump using the pump lifting device installed on the roof of the storage tank,
A first step of lifting the pump housed in the pump barrel by winding the first wire with a power-driven winch of the pump lifting device;
A second step of eliminating slack in the second wire connected to the pump independently of the first wire by the manually driven winch of the pump lifting device;
A pump lifting method characterized by comprising: