JP2582340Y2 - Pump support structure for liquefied gas carrier - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a pump in a liquefied gas carrier for transporting liquefied gas such as liquefied natural gas by sea.

[0002]

2. Description of the Related Art As is well known, a liquefied gas carrier that transports liquefied gas such as LNG by sea is provided with facilities for pumping liquefied gas stored in a cargo tank out of the ship.
A cargo facility including a cargo pump disposed at the bottom in the cargo tank and a pipe connected to an upper end of the cargo pump and led out of the cargo tank is provided.

In such a loading facility, the loading pump is supported by a pedestal provided at the bottom of the cargo tank. In this case, a substantially intermediate portion in the vertical direction of the loading pump is directly supported by the pedestal.・ It has a fixed structure. The cargo pipe is introduced into the tank from an upper wall of the cargo tank, and hangs downward in the tank, and a lower end thereof is connected to an upper end of the cargo pump.

Further, when the liquefied gas is stored in the cargo tank or when the liquefied gas stored in the cargo tank is pumped out, thermal expansion and contraction due to the temperature difference occur in the cargo pump and the cargo pipe. In consideration of such thermal expansion and contraction, the pipe is provided with an offset bend or the like at an intermediate position in the vertical direction in consideration of such thermal expansion and thermal contraction.

[0005]

By the way, in the above-described load pump support structure, the load pump is directly supported by the support member fixed to the cargo tank. If the load pipe is deformed, the deformation stress is concentrated and applied to the joint between the load pipe and the load pump, and there is a possibility that the sealability of the joint is impaired. In particular, when the above-described offset bend is interposed, the load pump is deformed off the axis in the vertical direction, so that a significant bending stress is applied to the joint.

SUMMARY OF THE INVENTION The present invention provides a pump support structure for a liquefied gas carrier capable of avoiding concentration of deformation stress at a joint between a pump and a pipe and reliably pumping liquefied gas without impairing the sealing performance of the joint. It is intended to provide.

[0007]

According to a first aspect of the present invention, there is provided a pump support structure in which a pump is disposed at a bottom portion in a tank in which a liquefied gas is stored, and a pipe is connected to an upper end portion of the pump. The pipe extends upward and is led out of the tank. The pipe has a lower end fixed to a gantry installed at a bottom in the tank, and the pump has an upper end connected to the pipe. Characterized in that it is suspended and fixed to the lower end portion of the.

According to a second aspect of the present invention, there is provided a pump supporting structure according to the first aspect, wherein an engaging member having a vertical hole is fixed to an outer surface of the pump, and the pump is vertically mounted on the gantry. Protruding into the hole and arranged in the hole,
It is characterized in that an engaging rod is provided which engages with the engaging member and prevents the rotation when the pump tries to rotate around a vertical axis.

[0009]

According to the first aspect of the present invention, when the liquefied gas is stored in the tank, the pump and the pipe are rapidly cooled to cause thermal shrinkage, or the liquefied gas stored in the tank is discharged to the outside. Even if the temperature of the pump and pipe rises after pumping and thermal expansion occurs, the lower end of the pipe is fixed to a gantry installed at the bottom in the tank, and the upper end of the pump is attached to this lower end. Since the pumps are connected to each other and the pump is fixed in a state of being suspended from the pipe, deformation stress is not concentrated and applied to the joint between the pump and the pipe.

In the invention according to the second aspect, the engaging rod provided on the gantry is inserted through the hole of the engaging member fixed to the outer surface of the pump. Rotation of the pump around a vertical axis due to driving of the pump is prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show an example in which the pump support structure of the present invention is applied to a cargo pump in a liquefied natural gas carrier (hereinafter abbreviated as "LNG carrier") equipped with a self-supporting square type tank. is there. In the figure,
Reference numeral 1 is a cargo tank (tank), and B is its bottom.

As shown in FIG. 2, a gantry 2 is fixed at the center of the bottom B in the cargo tank 1 in which the liquefied gas is stored, and a load pump 3 is provided in the gantry. I have. A pipe 4 is connected to the upper end of the load pump 3 and extends upward and is guided to the outside through the upper wall of the dome 1a of the cargo tank 1. An approximately U-shaped offset when viewed from the front is provided at an intermediate portion in the vertical direction. Bend 5 is interposed.

As shown in FIGS. 1 (a) and 1 (b), the gantry 2 is mainly composed of angle steel, and a leg member is provided at a corner of a rectangular upper frame 2a in plan view. 2b
Are joined, and the upper frame 2a and the leg members 2b form a space in which the load pump 3 can be accommodated. The lower ends of these leg members 2b are fixed on reinforcing ribs 6, 6 which are vertically provided at the bottom B of the cargo tank 1.

A frame member 8 constituting the upper frame 2a of the gantry 2;
8, two angle steels 9, 9 are erected at predetermined intervals in the left-right direction on the paper (the same applies hereinafter), and the angle steel 9 is provided at an intermediate portion of the angle steel 9, 9 in the vertical direction. , 9 are fixed to support members 10, 10 extending in the left-right direction. At the tips of these support materials 10, 10,
Support plates 10a and 10a having a predetermined curvature are fixed. Plates 2c, 2c extending in the horizontal direction are fixed to the lower ends of the leg members 2b, and engaging pins (engaging rods) projecting downward are provided at the distal ends of the plates 2c, 2c. ) 2d are fixed.

The lower end of the pipe 4 is connected to the support plate 10.
a and 10a, and are sandwiched and fixed by the support plates 10 and 10.
The length of the pipe 4 is set so that its lower end is located below the upper frame 2a.
a is provided.

On the other hand, a flange 3a is provided at an upper end portion of the load pump 3 disposed in the gantry 2, and a flange 4a at a lower end of the load pipe 4 is provided on the flange 3a.
a are joined and connected by a fastener (not shown) composed of a bolt and a nut. That is, the cargo pump 3 is disposed in the gantry 2 and is fixed in a state of being suspended from the cargo pipe 4 with a predetermined clearance between the lower end thereof and the bottom B of the cargo tank 1. .

Plates (engaging members) 11, 11 extending in the horizontal direction and having vertical holes (not shown) are fixed to the outer surface of the load pump 3, and the plate members 2c are provided in the holes. , 2c are inserted through the pins 2d.

In the support structure of the load pump 3 having the above configuration,
When the cargo pump 3 and the cargo pipe 4 are rapidly cooled when the liquefied gas is stored in the cargo tank 1 and thermal contraction occurs, or after the liquefied gas stored in the cargo tank 1 is pumped out to the outside, the cargo pump 3. In the case where the temperature of the load pipe 4 rises and thermal expansion occurs, even if the load pump 4 is displaced from the axis in the vertical direction with the deformation of the offset bend 5, the lower end of the load pipe 4 Part is supported by a gantry 2 fixed to a bottom B in a cargo tank 1, and an upper end of the load pump 2 is connected to a lower end thereof.
And the load pump 3 and the load pipe 4 are not concentratedly loaded with the deformation stress.

Pins 2d fixed to the leg members 2b of the gantry 2 are inserted through holes of the plate members 11 fixed to the outer surface of the load pump 3, and the pins 2d are moved up and down due to thermal deformation of the load pump 3. The movement is not restricted, and only the rotation about the vertical axis due to the reaction force of the driving of the load pump 3 is prevented.

As described above, according to the support structure of the load pump 3 of the above embodiment, the lower end of the load pipe 4 is supported by the gantry fixed to the bottom B in the cargo tank 1, and the lower end of the load pipe 4 is supported. The cargo pump 3 is fixed in a suspended state by connecting the upper end portion of the cargo pump 3 to the cargo pump 3. Therefore, when the liquefied gas is stored in the cargo tank 1,
Alternatively, after the liquefied gas stored in the tank is pumped out, the deformation stress is not concentrated and applied to the joint between the loading pump 3 and the loading pipe 4. Therefore, without impairing the sealing performance at the joint,
The liquefied gas can be reliably pumped out of the cargo tank 1.

Further, since the pins 2d fixed to the legs 2b of the gantry 2 are inserted into the holes of the plate members 11, 11 fixed to the outer surface of the load pump 3, the load 2 is caused by the thermal deformation of the load pump 3. The vertical movement is not restricted, and only the rotation about the vertical axis accompanying the driving of the load pump 3 can be prevented. Therefore, even when the reaction force accompanying the driving of the pump is large, such as when the load pump 3 is large, the reaction force can be prevented from being concentrated on the joint between the load pump 3 and the load pipe 4, and the joint can be prevented. There is no loss of sealing performance.

In addition, when removing the load pump 3,
By removing the pins 2d and removing the fasteners at the joint with the load pipe 4, only the pump can be removed, and the load pump 3 can be easily maintained.

It should be noted that the pump support structure of the present invention is not limited to the application to the load pump of the above embodiment, but can be applied to other pumps such as a spray pump for pre-cooling the cargo tank 1. In this case, when the reaction force accompanying the driving of the applied pump is small, the rotation preventing mechanism for preventing the rotation of the pump as in the above-described embodiment may not be provided.

[0024]

According to the pump support structure of the liquefied gas carrier of the present invention, the following effects can be obtained. According to the support structure of the pump according to claim 1, the lower end of the pipe is fixed to a gantry installed at the bottom in the tank, and the upper end of the pump is connected to the lower end. Since the pump is fixed while suspended from the gantry, deformation stress is not concentrated and applied to the joint between the pump and the pipe. Therefore, the liquefied gas can be reliably pumped without impairing the sealing performance of the joint.

According to the pump support structure of the present invention, the engaging rod provided on the pedestal is inserted through the hole of the engaging member fixed to the outer surface of the pump. In addition, it is possible to prevent the pump from rotating around a vertical axis when the pump is driven. Therefore, even when the reaction force due to driving is large, such as when the pump is large, concentration of the reaction force at the joint between the pump and the pipe is avoided and the liquefied gas Can be pumped.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment in which a pump support structure in a liquefied gas carrier of the present invention is applied to a load pump;
(A) is a front view, (b) is a plan view.

FIG. 2 is a schematic front sectional view showing an arrangement of a pump support structure of the embodiment in a tank.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 tank 2 gantry 2d engaging rod 3 pump 4 pipe 11 engaging member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B63J 5/00 B63B 25/16

Claims (2)

(57) [Scope of request for utility model registration] 1. A pump is disposed at a bottom of a tank in which a liquefied gas is stored, a pipe is connected to an upper end of the pump, and the pipe extends upward and is led out of the tank. Liquefaction, wherein the pipe has a lower end fixed to a gantry installed at a bottom in the tank, and the pump has an upper end suspended and fixed to a lower end of the pipe. A support structure for a pump in a gas carrier. 2. The pump support structure according to claim 1, wherein an engaging member having a vertical hole is fixed to an outer surface of the pump, and the mounting base projects vertically into the hole. Liquefaction characterized by being provided with an engaging rod that is inserted and arranged and that engages with the engaging member to prevent the rotation when the pump is about to rotate around a vertical axis. A support structure for a pump in a gas carrier.