JPS58204995A - Pump device for pumping liquefied gas - Google Patents

Abstract

PURPOSE:To enable main parts of a pump device to be easily removed from a liquefied gas storage tank by hanging down a pump body into a barrel with a cover and a discharge casing being mounted on the pump body. CONSTITUTION:A pump body 3 having a head cover removed and a cover 11 and a discharge casing 9 mounted is hung down into a barrel 2 with a wire 18 hooked on a flange portion to a discharge casing 9. Then, a cable 13 is secured fixedly to the discharge casing 9 with a stud 14. Under these condition, liquefied gas is completely shut off by a gate valve 15 without leakage to the outside and the pump body 3 can be hung down into the barrel 2 so that main parts of the pump device can be easily removed from the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquefied gas pumping device for pumping flammable liquefied gas such as methane, propane, butane, etc. from a storage tank.

Fig. 1 shows a conventional pump device for pumping up liquefied gas.

FIG. 2 will be explained. In FIG. 1, a barrel 2 is suspended within a liquefied gas storage tank 1, and a pump body 3 is installed within this barrel 2. A valve 4 for cutting off the liquefied gas 'a' in the storage tank 1 is attached to the lower end of the barrel 2. When lifting the pump body 3f, the valve 4 removes the liquefied gas in the barrel 2, replaces the vaporized gas in the barrel 2 with inert gas, and then closes the barrel 2 and tank 1.
was blocking it. As shown in Fig. 2, the valve structure is such that when the pump main body 3 is lowered in the burner 2 and the lower end of the pump main body 3 contacts the valve 4, and the valve 4 is pushed down against the splash 5 by its own weight, the storage The liquefied gas in the tank 1 is introduced into the burner 2. The pump body 3 descends until the seven flange 6 abuts the tapered sealing surface 7. Conversely, when the pump body 3 is pulled up, it is released from its own weight and the valve 4 is closed by the tension of the spring 5, and the inside of the parrel is cut off from the storage tank 1.

In this type of pump device for pumping liquefied gas,...
Since the valve device, which is the central part of the door device, is located at the bottom of the hill, it is difficult to check valve operation 1 disassembly and inspection.
It was difficult to ensure sufficient reliability for long-term use. SUMMARY OF THE INVENTION An object of the present invention is to provide a pump device for pumping up liquid gas which has an extremely simple structure and which ensures that liquefied gas does not leak to the outside during lifting and installation of the pump.

Embodiments of the present invention will be described below with reference to the drawings.

Components that are the same as those in FIGS. 1 and 2 will be described with the same reference numerals.

In FIG. 3, 1 is a liquefied gas storage tank buried underground, and a barrel 2 is suspended within this tank 1. A guide wheel 8 is attached to the outer periphery of the pump body 3 and is suspended from a discharge casing 9 so as to come into contact with the inside of the burner nol 2 to facilitate movement. This discharge casing 9 is fixed to the head cover 10 by welding or the like, and is divided into a plurality of parts by cutting in the axial direction and connected by 7 flange. 11 is a discharge case m, l'l' ,,:, An expandable covering body that surrounds the y-g 9 and connects the upper part of the barrel and the pump body 3, and is made of, for example, a stainless steel bellows.In this embodiment, the covering body 11 is attached to the pump body. 3 is connected to the upper part of the barrel noll 2, but the pump body 3 and the head cover 10 may be connected to each other.As shown in FIG. Connected by welding Ma1Mb, it is made into a bellows shape and configured to be expandable and contractible. 12 is a terminal box and cable 13
It is supplied to the motor section of the pump body 3 via. The cable 13 is fixed to the discharge casing 9 by a catch 14 . Reference numeral 15 denotes a gate valve, and after housing the pump body 3 in the upper part of the barrel 2, the gate valve 15 is closed to isolate the liquefied gas storage tank 1 from the upper part of the barrel 2.

Next, the lifting and installation of the pump body will be explained.

When the pump body 3 is installed in the burner 2, the gate pulp 15 is first closed and the gas between the head cover (not shown) and the gate pulp 15 is replaced with an inert gas. 16.
17 is an inert gas introduction pipe and a liquefied gas (vaporized gas) discharge pipe. Next, remove the head cover and cover 11.
．． With the discharge casing 9 attached to the pump body 3, a 7-lung portion of the discharge casing 9 is suspended by a wire 18, and the pump body 3 is suspended into the barrel 2 while the wire 18 is fed by a crane 19 or the like. At that time, at the same time, the cable 13'i is fed out from the cable drum 20, and the cable 1
3 is fixed to the discharge casing 9 with a stopper 14. In this state, the liquefied gas is completely shut off by the gate valve 15.
The pump body 3 can be suspended within the burner 2 without leaking to the outside. After suspending the pump body 3 to some extent, the upper end of the covering body ii is
/Secure with bolts to 2. Next, the gate valve 15
is opened and the pump body 3 is lowered into the liquefied gas storage tank 1. (See Fig. 6) The connection work for the discharge casing 9 is to connect the discharge casing 9i with bolts while the discharge casing is suspended from the jig 21 that straddles the head cover 10, as shown in Fig. 7 which shows the direction of arrow A in Fig. 6. . In this case, the covering 11 expands as the pump body 3 moves downward,
The vaporized gas rising inside the burner 2 is blocked by the covering 11 and does not leak to the outside. However, the inside of the discharge casing 9 communicates with the storage tank 1 through the flow path of the pump body 3, and vaporized gas leaks out.

Therefore, a blind cover 22 is attached to the upper end of the discharge casing 9 to prevent this. When the 72-inch portion of the discharge casing 9 is connected with bolts, the blind cover 22 is removed and the connection is performed. Also, at the same time as connecting the discharge casing 9, the cable 13 is connected to the cable drum 2.
It is fixed to the discharge casing 9 with the delivery stopper 14 from 0. Finally, the installation work is completed by fixing the head cover 10 to the upper end of the barrel 2.

When pulling up the pump body 3 from the barrel 2, the above procedure can be reversed.

As explained above, according to the present invention, the main parts of the pump device can be taken out of the liquefied gas storage tank, making maintenance management easier. In addition, the gas pressure and liquid pressure difference i acting on the parrel are almost zero, so that: - In terms of strength, the wall thickness can be made extremely thin compared to the conventional vernor that also serves as a discharge pipe. In addition, while conventional barrels that also serve as discharge pipes require purging of liquefied gas, with this invention, only the vaporized gas in the upper part of the gate valve can be replaced with inert gas, making the work extremely easy. .

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional pump device for pumping up liquefied gas.
2 is a sectional view of the main part of FIG. 1, FIG. 3 is a sectional view of the pump device for pumping up liquefied gas of the present invention, FIG. 4 is a sectional view of the covering of FIG. 3, and FIGS. 6 is a diagram illustrating the installation of the pump main body in FIG. 3, and FIG. 7 is a view taken in the direction of arrow A in FIG. 6. DESCRIPTION OF SYMBOLS 1...Storage tank, 2...Barrel, 3...Pump main body, 8...Guide wheel, 9...Discharge casing, 10...Head cover, 11...AE subject,
1s...gate valve. 1st concave Y z Figure VJ, 3 Figure 4 Figure S In Japanese Patent Publication No. 58-204995 (4) True 5 Roshi] Rain 7 Figure 9 Every square cut

Claims (1)

[Scope of Claims] 1. A pump device for pumping up liquefied gas in which a barrel is installed hanging down in a liquefied gas storage tank, and a pump body moves up and down inside the barrel, wherein the pump body is connected to a discharge casing by an upper 7 flange. A pump for pumping up liquefied gas, characterized in that an expandable cover is disposed between the pump main body and the barrel upper part or the upper seven flange so as to hang down from above and surround the discharge casing. Device. 2. Claim 1 is characterized in that, when the pump body is pulled up to the top of the barrel, a gate valve is disposed on the barrel to separate the pump body from the housing part. Pump equipment for pumping liquefied gas. 3. A pump device for pumping up liquefied gas according to claim 1, wherein the discharge casing is divided into a plurality of parts in the axial direction. 4. A pump device for pumping up liquefied gas according to claim 1, wherein the covering body is configured in a bellows shape. 5. A pump device for pumping up liquefied gas according to claim 4, wherein the covering body is made of metal. 6. In claim 1, a guide wheel is attached to the outer periphery of the pump body, and the guide wheel is configured to roll on the inner surface of the barrel to facilitate the raising and lowering of the pump body. A pump device for pumping liquefied gas characterized by: