KR101017562B1 - Pipe connecter for withdrawing liquefied petroleum gas in pipe and withdrawing device and thereof withdrawing method - Google Patents

Abstract

The present invention discloses a system for recovering residual liquefied petroleum gas in a pipe which enables the recovery of liquefied petroleum gas remaining in the pipe. The present invention relates to a residual liquefied petroleum gas recovery system in a pipe, comprising: a storage tank in which liquefied petroleum gas is stored; A gas pipe communicating with one side of the storage tank and having a first gas shutoff valve installed at a front end and a second gas shutoff valve installed at an end thereof to selectively discharge vaporized gas; A liquid pipe communicating with the other side of the storage tank, having a first liquid shutoff valve installed at a front end and a second liquid shutoff valve installed at a distal end thereof to selectively fill the storage tank with liquefied petroleum gas of an LLP tank for a vehicle; A recovery device for communicating the liquid pipe exposed to the outside with the gas pipe to recover the liquefied petroleum gas remaining in the liquid pipe to the storage tank; The gas pipe branched from one side of the liquid pipe and then piped back to the liquid pipe after diesel, and includes a gas pipe installed on the line to recover the liquefied petroleum gas into the storage tank, thereby liquefying remaining in the transfer pipe. It is possible to prevent the rupture of various pipes due to the volume expansion of the remaining liquefied petroleum gas by completely recovering the petroleum gas, and to prevent the fire accident due to the external leakage of the liquefied petroleum gas.

 Liquefied petroleum gas, piping, recovery equipment

Description

PIPE CONNECTER FOR WITHDRAWING LIQUEFIED PETROLEUM GAS IN PIPE AND WITH DRAWING DEVICE AND THEREOF WITHDRAWING METHOD}

The present invention relates to a pipe connection and a recovery device for recovering residual liquefied petroleum gas in a pipe, and more particularly, to a volume of liquefied petroleum gas remaining by completely recovering the liquefied petroleum gas remaining in the transport pipe. The present invention relates to a pipe connection and a recovery device for recovering residual liquefied petroleum gas and a method for recovering the residual liquefied petroleum gas, which can prevent a plurality of pipes from rupturing due to expansion and also prevent a fire accident caused by an external outflow of the liquefied petroleum gas.

In general, the storage tank for storing liquefied petroleum gas is provided with a liquid pipe 30 for the LPG liquid is introduced and a gas pipe 20 for discharging the gas and a plurality of shutoff valves (21, 22, 31, 32) and backflow A high pressure hose and a coupling are connected to the prevention valve 33 and the liquid transfer pump 70 or the gas compressor 50 and the vehicle tank (hereinafter, referred to as a tank lorry, not shown).

In this way, the coupling of the high pressure hose coupling of the liquid pipe 30 and the gas pipe 20 connected to the storage tank to the LPG tank lorry, and then open the gas valve and the like, and operates the liquid transfer pump 70 or the gas compressor 50. When the gas in the storage tank 10 is discharged to the tank lorry and the LPG liquid of the tank lorry is transferred to the storage tank 10, the LPG is filled.

Then, when the filling is completed, the operation of the liquid transfer pump 70 or the gas compressor 50 is stopped, the shutoff valves 21, 22, 31, and 32 are closed, and the high pressure hose is separated by disassembling the coupling from the tank lorry. do. At this time, as the shutoff valves 21, 22, 31, and 32 of the storage tank are blocked, the release of the LPG is prevented.

Hereinafter, a conventional liquefied petroleum gas filling system will be described in more detail with reference to the accompanying drawings.

1 is a plan view showing the structure of a liquefied petroleum gas filling system installed with a conventional liquid transfer pump, Figure 2 is a plan view showing the structure of a liquefied petroleum gas filling system provided with a conventional gas compressor.

As shown in these figures, the conventional liquefied petroleum gas filling system is in communication with the storage tank 10 in which the liquefied petroleum gas is stored, and one side of the storage tank 10, and the first gas shutoff valve 21 at the front end. Is installed and a second gas shutoff valve 22 is installed at an end thereof to communicate with the gas pipe 20 through which gaseous gas is discharged, and the other side of the storage tank 10, and the first liquid shutoff valve 31 and The non-return valve 33 is installed and the second liquid shutoff valve 32 is installed at the end thereof to selectively fill the liquefied petroleum gas into the storage tank 10 and the liquid transfer pump 70 or the gas. The compressor 50 is comprised.

The storage tank 10 is formed in a tubular shape in which an outer surface having a predetermined inner space is bent so as to store liquefied petroleum gas therein, and a gas pipe 20 is connected to one side of the upper surface and the other side of the upper surface. The liquid pipe 30 is connected.

The length of the gas pipe 20 inserted into the upper surface of the storage tank 10 to be in communication with the storage tank 10 is inserted into the storage tank 10 to have a relatively shorter length than the liquid pipe 30. This is to facilitate the discharge of the liquefied petroleum gas in the storage tank 10 to the outside of the storage tank 10 by vaporizing the gas vaporized in the storage tank 10.

The first gas shutoff valve 21 for discharging the vaporized gas in the storage tank 10 is provided on the gas pipe 20 near the storage tank 10, that is, the gas pipe 20. At the end of the high-pressure hose (not shown) connected to the gas pipe 20, a second gas shutoff valve that can prevent the vaporized gas in the storage tank 10 from being discharged to the outside through the gas pipe 20 ( 22 is provided, and a coupling 23 is fixedly coupled to an end of the second gas shutoff valve 22.

The length of the liquid pipe 30 inserted into the upper surface of the storage tank 10 to be in communication with the storage tank 10 has a relatively longer length than the gas pipe 20 and the bottom surface of the storage tank 10. It extends to a close position and is inserted into the storage tank 10, which is to easily fill the storage tank 10 with liquefied petroleum gas.

The first liquid shutoff valve 31 for filling the liquefied petroleum gas into the storage tank 10 is provided on the liquid pipe 30 at the position close to the storage tank 10, that is, the liquid pipe 30. The non-return valve 33 is installed to prevent the liquefied gas in the storage tank 10 from flowing back to the outside, and the liquefaction remaining in the liquid pipe 30 at the end of the high pressure hose (not shown) connected to the liquid pipe 30. A second liquid shutoff valve 32 is installed to prevent the petroleum gas from being discharged to the outside through the liquid pipe 30 and a coupling 34 is provided at the end of the second liquid shutoff valve 32. ) Is fixedly coupled.

By such a configuration, a method of filling liquefied petroleum gas into the storage tank 10 by using a conventional liquefied petroleum gas filling system is, firstly, liquid and gas of a vehicle LPG tank (hereinafter referred to as a tank lorry) containing liquefied petroleum gas. After coupling the coupling of the piping (not shown) and the coupling of the high pressure hose (not shown) for the liquefied gas and the high pressure hose (not shown) for the vaporization gas of the storage tank 10, and installed in the gas piping and liquid piping The shutoff valves 21, 22, 31, and 32 are kept open, and then the liquid transfer pump 70 or the gas compressor 50 are operated.

Thereafter, the liquefied petroleum gas of the tank lorry (not shown) is introduced into the storage tank 10 through the liquid pipe 30, and the volume of the liquefied petroleum gas introduced into the storage tank 10 simultaneously with the introduction of the liquefied petroleum gas. The vaporized petroleum gas present in the vaporized state in the storage tank 10 is discharged to the tank lorry (not shown) through the gas pipe 20, thereby filling the liquefied petroleum gas.

When the desired amount of liquefied petroleum gas is filled into the storage tank 10, the second liquid shutoff valve 32 of the liquid pipe and the second gas shutoff valve 22 of the gas pipe are locked, and the tank lorry (not shown) is piped. Separating the coupling 34 and the filling of the liquefied petroleum gas is completed.

However, in the conventional liquefied petroleum gas filling system, after the filling of the liquefied petroleum gas in the storage tank 10 is completed, the vaporized LP gas remains in the gas pipe 20 and the liquid pipe 30 is in a liquefied state. LP gas remains, but if the residual liquefied LP gas is discharged to the outside, there is a problem not only causes environmental pollution, but also exposed to fire risk,

In addition, when the remaining liquefied LP gas is expanded due to the increase in the ambient temperature there is a problem that the connection portion or the high pressure hose of the liquid pipe 30 may be damaged.

The object of the present invention devised in view of the above point is to completely recover the liquefied petroleum gas remaining in the transport pipe and prevent the connection portion of the pipe or the high pressure hose from rupturing due to the volume expansion of the liquefied petroleum gas remaining. In addition, the present invention provides a pipe connection and a recovery device for recovering residual liquefied petroleum gas, and a method for recovering the residual liquefied petroleum gas, which can prevent a fire accident caused by external leakage of liquefied petroleum gas.

In order to achieve the object of the present invention as described above, the present invention, the one end and the front end of the storage tank in which the liquefied petroleum gas is stored and the end of the gas pipe is selectively discharged, and the other side of the storage tank and It is for recovering the liquefied petroleum gas in the pipe by communicating the front end and communicating with the end of the liquid pipe for selectively filling the liquefied petroleum gas of the vehicle LPI tank to the storage tank,
One end is provided with a first coupling member coupled to the coupling provided at the end of the gas pipe,
The other end is provided with a second coupling member coupled to the coupling provided at the end of the liquid pipe,
Both ends are coupled to the first coupling member and the second coupling member so that the first coupling member and the second coupling member communicate with each other so that communication means for communicating the gas pipe and the liquid pipe are provided. Provided is a piping connector for recovering residual liquefied petroleum gas in a pipe.
In this case, the communication means is a tubular communication member coupled to the end of the first coupling member and the second coupling member in a swivel joint structure.
The communication means is a communication tube formed of a tubular metal material fixedly coupled to the ends of the first coupling member and the second coupling member.
The communication means is a communication hose fixedly coupled to the ends of the first coupling member and the second coupling member, formed of a metal material or rubber material and can be flexibly bent.
In addition, the present invention, the storage tank in which liquefied petroleum gas is stored;
A gas pipe communicating with one side of the storage tank and having a first gas shutoff valve installed at a front end and a second gas shutoff valve installed at an end thereof to selectively discharge vaporized gas;
A liquid pipe communicating with the other side of the storage tank, having a first liquid shutoff valve installed at a front end and a second liquid shutoff valve installed at a distal end thereof to selectively fill the storage tank with liquefied petroleum gas of an LLP tank for a vehicle;
A pipe connecting part for recovering residual liquefied petroleum gas in the pipe for mutually communicating the liquid pipe exposed to the outside to recover the liquefied petroleum gas remaining in the liquid pipe to the storage tank;
Residual in the pipe characterized in that it comprises a diesel gas pipe branched on one side of the liquid pipe and after the diesel oil is re-integrated with the liquid pipe and a gas compressor for recovering liquefied petroleum gas into the storage tank is installed on the line. Provided is a liquefied petroleum gas recovery device.
In addition, a storage tank for storing liquefied petroleum gas;
A gas pipe communicating with one side of the storage tank and having a first gas shutoff valve installed at a front end and a second gas shutoff valve installed at an end thereof to selectively discharge vaporized gas;
A liquid pipe communicating with the other side of the storage tank, having a first liquid shutoff valve installed at a front end and a second liquid shutoff valve installed at a distal end thereof to selectively fill the storage tank with liquefied petroleum gas of an LLP tank for a vehicle;
A diesel gas pipe branched from one side of the liquid pipe and then piped back to the liquid pipe after diesel, and a pump for recovering liquefied petroleum gas to the storage tank is installed on the line;
A bypass pipe and the bypass pipe communicating with one side of a gas pipe between the first gas shutoff valve and the second gas shutoff valve, and one side of a liquid pipe between the first liquid shutoff valve and the second liquid shutoff valve. It provides a residual liquefied petroleum gas recovery device in the pipe, characterized in that consisting of a bypass valve installed on the.
And, as a method for recovering the residual liquefied petroleum gas in the pipe using the residual liquefied petroleum gas recovery system in the pipe,
After filling the storage tank with the liquefied petroleum gas of the vehicle LPG tank, separating the liquid pipe and the pipe of the vehicle LPG tank and locking the second liquid shutoff valve and the second gas shutoff valve;
Coupling a first coupling member and a second coupling member to the coupling, respectively, and opening the second liquid shutoff valve and the second gas shutoff valve;
Operating the gas compressor to introduce liquefied petroleum gas remaining in the liquid pipe into the storage tank, and to simultaneously discharge gaseous gas from the storage tank into the gas pipe. Provide a method for oil oil recovery.
In addition, as a method for recovering the residual liquefied petroleum gas in the pipe using the residual liquefied petroleum gas recovery device in the pipe,
After filling the storage tank with the liquefied petroleum gas of the vehicle LPG tank, separating the liquid pipe and the pipe of the vehicle LPG tank and locking the second liquid shutoff valve and the second gas shutoff valve;
Opening a bypass valve installed in the bypass pipe;
Operating the pump to introduce the liquefied petroleum gas remaining in the liquid pipe into the storage tank, and simultaneously discharging the vaporized gas of the storage tank into the gas pipe. Provided is a gas recovery method.

As described above, the piping connection and recovery device for recovering residual liquefied petroleum gas in the pipe according to the present invention and the method for recovering the same are obtained by completely recovering the liquefied petroleum gas remaining in the transfer pipe and expanding the volume of the remaining liquefied petroleum gas. Due to this, the connection part of the pipe or the high pressure hose is prevented from being ruptured, and the fire accident caused by the external leakage of the liquefied petroleum gas can be prevented in advance.

Hereinafter, the liquefied petroleum gas filling system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a plan view showing the structure of the residual liquefied petroleum gas recovery apparatus in the pipe according to an embodiment of the present invention, Figure 4 is a plan view showing the structure of the recovery device of Figure 3, Figure 5 is a recovery of Figure 3 6 is a plan view showing another structure of the apparatus, Figure 6 is a plan view showing another structure of the recovery device of Figure 3, Figure 7 shows the structure of the liquefied petroleum gas filling system in the pipe according to another embodiment of the present invention One floor plan.

As shown in these drawings, the residual liquefied petroleum gas recovery apparatus in the pipe according to an embodiment of the present invention, the storage tank 100, the liquefied petroleum gas is stored, and the one side of the storage tank 100 in communication with the shear The first gas shutoff valve 210 is installed in the second gas shutoff valve 220 is installed at the end is in communication with the gas pipe 200 and the other side of the storage tank 100 to selectively discharge the vaporized gas, The first liquid shutoff valve 310 is installed at the front end and the second liquid shutoff valve 320 is installed at the end to selectively fill the liquefied petroleum gas into the storage tank 100 and the liquid pipe ( It is branched from one side of the 300 and the diesel gas pipe 400 and the gas pipe after being piped back to the liquid pipe 300 and pumped to fill the liquefied petroleum gas into the storage tank 100 and installed on the line of the diesel pipe 400 The liquid transfer pump 500 and the liquefied petroleum gas remaining in the liquid pipe 300 are stored. It is configured to include a greater number of times to the to the outside (100) exposed to the liquid pipe 300 and the gas pipe 200 mutually communicates recovery pipe connector 600 of the.

The storage tank 100 is formed in a tubular shape in which an outer surface having a predetermined inner space is bent to store the liquefied petroleum gas therein, and one side of the upper surface is connected to the gas pipe 200, and the other side of the upper surface is The liquid pipe 300 is connected.

The length of the gas pipe 200 inserted into the upper surface of the storage tank 100 so as to communicate with the storage tank 100 is inserted into the storage tank 100 to have a relatively short length than the liquid pipe 300. This is for evaporating the liquefied petroleum gas into the storage tank 100 so as to easily discharge the vaporized gas filled in the storage tank 100 to the outside of the storage tank 100.

The first gas shutoff valve 210 for discharging the vaporized gas in the storage tank 100 is installed on the gas pipe 200 at the position close to the storage tank 100, that is, the gas pipe 200. A second gas blocking valve 220 is installed at the end of the gas pipe 200 to prevent unwanted vaporization of the vaporized gas inside the storage tank 100 to the outside through the gas pipe 200. The high pressure hose 250 is connected to the end of the second gas shutoff valve 220 exposed to the outside, and the coupling 230 is fixedly coupled to the end of the high pressure hose.

The length of the liquid pipe 300 inserted into the upper surface of the storage tank 100 to be in communication with the storage tank 100 has a relatively longer length than the gas pipe 200 and the bottom surface of the storage tank 100 It is extended to a close position is inserted into the storage tank 100, which is to easily fill the liquefied petroleum gas into the storage tank 100 and to send the liquefied petroleum gas in the storage tank 100 to another container.

A first liquid shutoff valve 310 for filling liquefied petroleum gas into the storage tank 100 is installed on the liquid pipe 300 at a position close to the storage tank 100, that is, the liquid pipe 300. A second liquid shutoff valve 320 is installed at the end of the liquid pipe 300 to prevent the liquefied petroleum gas remaining in the liquid pipe 300 from being discharged to the outside through the liquid pipe 300. The high pressure hose 350 is connected to an end of the second liquid shutoff valve 320 that is exposed to the outside, and the coupling 340 is fixedly coupled to the end of the high pressure hose 350.

In the intermediate position of the liquid pipe (300) is branched from one side of the liquid pipe (300), after the diesel, the diesel pipe 400 is coupled with the liquid pipe 300 is installed again, the diesel tank 400 on the storage tank ( A liquid transfer pump 500 is provided that provides power to fill the liquefied petroleum gas with 100.

At the rear end of the first liquid shutoff valve 310 of the liquid pipe 300, a non-return valve 330 is installed to prevent the liquefied petroleum gas from flowing back when the liquefied petroleum gas is filled into the storage tank 100. .

As shown in FIGS. 4 to 6, the recovery piping connectors 600, 700, and 800 may include first coupling members 610, 710, and 810 coupled to the couplings 230 and 340, and second couplings, respectively. The first coupling members 610, 710, 810 are coupled to ends of the members 620, 720, 820, the first coupling members 610, 710, 810, and the second coupling members 620, 720, 820. ) And a communication tube 630, 730, 830 for communicating the second coupling member 620, 720, 820.

4 is a swivel joint structure in which the first coupling member 610 and the second coupling member 620 are rotatable at both ends of the communication member 630 having a predetermined diameter. 5 and 6, the first coupling member 710 and 810 and the second coupling member 720 and 820 communicate with each other. It has a structure that is fixedly coupled to both ends of (730, 830), respectively.

Here, the communication pipes 630 and 730 of FIGS. 4 and 5 are preferably stainless steel and are formed of a metal material such as copper, and the communication pipe 830 of FIG. 6 is formed of a metal flexible hose or a high pressure hose having a rubber material. It is desirable to.

The operation of the liquefied petroleum gas filling system according to an embodiment of the present invention configured as described above is as follows.

First, the couplings 340 and 230 of the high pressure hoses 250 and 350 connected to the liquid pipe 300 and the gas pipe 200 are connected to the LPG tank (tanklori, not shown) containing the liquefied petroleum gas. The first liquid shutoff valve 310 and the second liquid shutoff valve 320 and the discharge valve 210 and the second gas shutoff valve 220 are kept open.

Thereafter, when the liquid transfer pump 500 is operated, the liquefied petroleum gas of the vehicle LPG tank (tankuri) (not shown) is introduced into the storage tank 100 through the liquid pipe 300 and the diesel oil pipe 400, and liquefied. LPG existing in the vaporized state in the storage tank 100 by the volume of the liquefied petroleum gas introduced into the storage tank 100 at the same time as the inflow of petroleum gas LPG tank (tank lorry) for the vehicle through the gas pipe 200 (not shown) By releasing the liquefied petroleum gas is made.

When the desired amount of liquefied petroleum gas is charged to the storage tank 100, the second liquid shutoff valve 320 of the liquid pipe 300 and the second gas shutoff valve 220 of the gas pipe 220 are locked and the vehicle is closed. When the couplings 230 and 340 are separated from the LPG tank (tankuri) (not shown), the filling of the liquefied petroleum gas is completed.

After the filling of the liquefied petroleum gas is completed, the couplings 230, 340 and the first coupling members 610, 710, and 810 of the recovery piping connectors 600, 700, and 800 shown in FIGS. The second coupling members 620, 720, and 820 are coupled to each other, and the liquid transfer pump 500 is operated to introduce liquefied petroleum gas remaining in the liquid pipe 300 into the storage tank 100 and at the same time the storage tank 100. ) Vaporized gas is introduced into the liquid pipe 300 through the gas pipe 200.

In this way, the liquefied petroleum gas remaining in the liquid pipe 300 can be recovered to the storage tank 100 and the connection portion of the liquid pipe 300 or the high pressure hose 350 due to the volume expansion of the residual liquefied petroleum gas. Accidents caused by breakage or external release of liquefied petroleum gas can be prevented.

7 is a plan view showing the configuration of the liquefied petroleum gas filling system according to another embodiment of the present invention, the description of the same parts as the configuration of the liquefied petroleum gas filling system according to an embodiment of the present invention will be omitted and different parts Only the description will be given.

In the liquefied petroleum gas recovery system in a pipe according to another embodiment of the present invention, one side of the gas pipe 200 between the first gas shutoff valve 210 and the second gas shutoff valve 220 and the first liquid shutoff valve ( Recovery composed of a bypass pipe 910 for connecting the one side of the liquid pipe 300 between the 310 and the second liquid shutoff valve 320 and a bypass valve 920 installed on the bypass pipe 910. The apparatus 900 is further installed.

By this configuration, the method of filling the liquefied petroleum gas is the same as the liquefied petroleum gas filling system according to an embodiment of the present invention, the method of recovering the remaining liquefied petroleum gas is separately collected in the coupling (230, 340) When the gas compressor 510 is operated while the second liquid shutoff valve 320 is closed and the bypass valve 920 is opened, the liquefied gas remaining in the liquid pipe 300 is not stored in the storage tank. At the same time, the vaporized gas in the storage tank 100 flows into the liquid pipe 300 through the gas pipe 200 and the gas compressor 510 to recover the liquefied gas.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

1 and 2 are a plan view showing the structure of a conventional liquefied petroleum gas filling system,

3 is a plan view showing the structure of a liquefied petroleum gas filling system according to an embodiment of the present invention,

4 is a plan view showing the structure of the recovery device of FIG.

5 is a plan view showing another structure of the recovery device of FIG.

6 is a plan view showing still another structure of the recovery device of FIG.

7 is a plan view showing the structure of a liquefied petroleum gas filling system according to another embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

100: storage tank 200: gas piping

210: first gas shutoff valve 220: second gas shutoff valve

300: liquid piping 310: first liquid shutoff valve

320: second liquid shutoff valve 400: gas pipe

410: non-return valve 500: liquid transfer pump

510: gas compressor 600, 700, 800, 900: recovery device

610, 710, 810: first coupling member 620, 720, 820: second coupling member

630: communication tube (swivel joint) 730: communication tube

830: Communication hose (metal flexible hose or high pressure hose) 910: Bypass pipe
920: bypass valve

Claims (8)

One end of the storage tank in which the liquefied petroleum gas is stored and the front end of the gas pipe in which the front end and the vaporization gas is selectively discharged, the other side and the front end of the storage tank is in communication with the liquefied petroleum gas of the vehicle LLP tank to the storage tank In order to recover the liquefied petroleum gas in the pipe by communicating with the end of the liquid pipe for selectively filling, One end is provided with a first coupling member coupled to the coupling provided at the end of the gas pipe, The other end is provided with a second coupling member coupled to the coupling provided at the end of the liquid pipe, Both ends are coupled to the first coupling member and the second coupling member so that the first coupling member and the second coupling member communicate with each other so that communication means for communicating the gas pipe and the liquid pipe are provided. Piping connector for residual liquefied petroleum gas recovery in the pipe characterized in that. The method of claim 1, The communication means is a pipe connecting member for restoring liquefied petroleum gas in the pipe, characterized in that the tubular communication member coupled to the end of the first coupling member and the second coupling member in a swivel joint structure. The method of claim 1, The communication means is a pipe connection for the remaining liquefied petroleum gas recovery in the pipe, characterized in that the communication pipe formed of a tubular metal material fixedly coupled to the end of the first coupling member and the second coupling member. The method of claim 1, The communication means is a residual liquefied petroleum in the pipe, characterized in that the communication hose fixedly coupled to the end of the first coupling member and the second coupling member, formed of a metal material or rubber material and can be bent flexibly Piping connection for gas recovery. A storage tank in which liquefied petroleum gas is stored; A gas pipe communicating with one side of the storage tank and having a first gas shutoff valve installed at a front end and a second gas shutoff valve installed at an end thereof to selectively discharge vaporized gas; A liquid pipe communicating with the other side of the storage tank, having a first liquid shutoff valve installed at a front end and a second liquid shutoff valve installed at a distal end thereof to selectively fill the storage tank with liquefied petroleum gas of an LLP tank for a vehicle; Residual in the pipe according to any one of claims 1 to 4 for communicating the liquid pipe and the gas pipe exposed to the outside to recover the liquefied petroleum gas remaining in the liquid pipe to the storage tank. Piping connection for liquefied petroleum gas; Residual in the pipe characterized in that it comprises a diesel gas pipe branched on one side of the liquid pipe and after the diesel oil is re-integrated with the liquid pipe and a gas compressor for recovering liquefied petroleum gas into the storage tank is installed on the line. Liquefied petroleum gas recovery system. A storage tank in which liquefied petroleum gas is stored; A gas pipe communicating with one side of the storage tank and having a first gas shutoff valve installed at a front end and a second gas shutoff valve installed at an end thereof to selectively discharge vaporized gas; A liquid pipe communicating with the other side of the storage tank, having a first liquid shutoff valve installed at a front end and a second liquid shutoff valve installed at a distal end thereof to selectively fill the storage tank with liquefied petroleum gas of an LLP tank for a vehicle; A diesel gas pipe branched from one side of the liquid pipe and then piped back to the liquid pipe after diesel, and a pump for recovering liquefied petroleum gas to the storage tank is installed on the line; A bypass pipe and the bypass pipe communicating with one side of a gas pipe between the first gas shutoff valve and the second gas shutoff valve, and one side of a liquid pipe between the first liquid shutoff valve and the second liquid shutoff valve. Residual liquefied petroleum gas recovery device in the pipe, characterized in that consisting of a bypass valve installed on the top. A method for recovering residual liquefied petroleum gas in a pipe using the residual liquefied petroleum gas recovery system in a pipe according to claim 5, After filling the storage tank with the liquefied petroleum gas of the vehicle LPG tank, separating the liquid pipe and the pipe of the vehicle LPG tank and locking the second liquid shutoff valve and the second gas shutoff valve; Coupling a first coupling member and a second coupling member to the coupling, respectively, and opening the second liquid shutoff valve and the second gas shutoff valve; Operating the gas compressor to introduce the liquefied petroleum gas remaining in the liquid pipe into the storage tank, and to simultaneously discharge the vaporized gas from the storage tank into the gas pipe. Liquefied petroleum gas recovery method. A method for recovering residual liquefied petroleum gas in a pipe using the residual liquefied petroleum gas recovery device in a pipe according to claim 6, After filling the storage tank with the liquefied petroleum gas of the vehicle LPG tank, separating the liquid pipe and the pipe of the vehicle LPG tank and locking the second liquid shutoff valve and the second gas shutoff valve; Opening a bypass valve installed in the bypass pipe; Operating the pump to introduce the liquefied petroleum gas remaining in the liquid pipe into the storage tank, and simultaneously discharging the vaporized gas of the storage tank into the gas pipe. Gas recovery method.

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