KR102204875B1 - A system for emergency discharging lpg and the ship or offshore structure including the same - Google Patents

Abstract

The present invention provides an emergency discharge system for an LPG fuel gas, which includes: a fuel tank receiving unit in which a fuel tank in which LPG is stored is installed inside; an air supply pipe provided in an upper portion of the fuel tank receiving unit and supplying air into the fuel tank receiving unit; an air ventilator provided in the upper portion of the fuel tank receiving unit to be opened and closed and discharging air introduced into the fuel tank receiving unit to the outside to ventilate the fuel tank receiving unit; a leakage detection unit defecting the LPG leaking from the fuel tank; a leaking fuel discharge unit provided in a lower portion of the fuel tank receiving unit to be opened and closed and discharging the leaking LPG to the outside; and a control unit controlling the air ventilator to be closed and the leaking fuel discharge unit to be opened in case of emergency situations in which the LPG leakes from the fuel tank in accordance with a detection signal of the leakage detection unit. Therefore, the emergency discharge system for an LPG fuel gas can be easily applied to a ship or a marine structure using the LPG.

Description

LG fuel gas emergency discharge system and ship or offshore structure including the same {A SYSTEM FOR EMERGENCY DISCHARGING LPG AND THE SHIP OR OFFSHORE STRUCTURE INCLUDING THE SAME}

The present invention relates to an emergency LPG fuel gas discharge system, and more particularly, can be easily applied to a ship or offshore structure using LPG, and in the event of an emergency situation in which LPG leaks from a fuel tank in which LPG is stored, leaking LPG quickly It relates to an emergency LPG fuel gas discharge system that can be safely processed and discharged to the outside.

According to recent technological developments, liquefied gas such as liquefied petroleum gas (LPG) has been widely used in place of gasoline or diesel.

LPG is a fuel that is made into a liquid by compressing gas containing propane and butane as main components from oil fields together with oil at room temperature.

Such LPG is colorless and odorless, and is widely used as fuel for home, business, industrial and automobiles, and recently, LPG fuel propulsion ships are being developed using LPG as fuel.

When LPG is used as a fuel, it can play a large role in reducing the emission of sulfur oxides compared to fuels such as gasoline or diesel, and has the advantage of low carbon dioxide emissions. There is an advantage that it can be miniaturized.

In addition, LPG is the first and most by-product produced in the process of petroleum refining and liquefaction of natural gas, and the marine cargo volume of LPG is increasing. As the LPG infrastructure grows globally, the demand for LPG fueled ships is increasing. Is expected.

However, since LPG is heavier than air, in the event of an emergency situation where LPG leaks from the fuel tank in the ship, the leaked LPG stays around the fuel tank, resulting in a risk of an explosion. There is a need for an emergency LPG discharge system that can quickly and safely dispose of it to the outside.

Registration Patent No. 10-2132151 (Registration Date: 2020.07.03.) "LPG Ship Propulsion System"

In the present invention, the LPG fuel gas emergency discharge system, specifically, can be easily applied to a ship or offshore structure using LPG, and in the event of an emergency situation in which LPG leaks from the fuel tank in which LPG is stored, the leaked LPG is quickly and safely treated. We intend to provide an emergency LPG fuel gas discharge system that can be discharged to the outside.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. I will be able to.

In order to solve the above-described problems, the present invention provides an air supply pipe for supplying air into the fuel tank receiving unit, provided on the fuel tank receiving unit in which the fuel tank storing LPG is installed therein, the fuel tank receiving unit , Air ventilation provided at the top of the fuel tank receiving unit to be opened and closed, and ventilating the air flowing into the fuel tank receiving unit to the outside, a leak detection unit that detects LPG leaking from the fuel tank, and the fuel tank receiving unit In the event of an emergency situation where LPG leaks from the fuel tank according to the detection signal of the leaked fuel discharge unit and leak detection unit to discharge the leaked LPG to the outside, air ventilation is closed and the leaked fuel is discharged. It provides an LPG fuel gas emergency discharge system including a control unit for controlling to open the unit.

In addition, the LPG fuel gas emergency discharge system further includes a water injection unit provided above the fuel tank receiving unit and injecting water into the fuel tank receiving unit under the control of a control unit when an emergency situation occurs in which LPG leaks from the fuel tank. to provide.

In addition, the leaked fuel discharge unit includes a drip tray inclined to allow liquid to flow out to the bottom of the fuel tank receiving unit, a discharge pipe connected to the drip tray, and an opening/closing valve for opening and closing the discharge pipe under the control of the control unit. Provide an emission system.

In addition, it provides an LPG fuel gas emergency discharge system further comprising a leaked fuel treatment unit that processes the leaked LPG discharged through the leaked fuel discharge unit and discharges it to the outside.

In addition, the leaked fuel processing unit includes an inlet line connected to the leaked fuel discharge unit, a gas-liquid separator for gas-liquid separation of leaked LPG flowing through the inlet line, and an LPG that is connected between the gas-liquid separator and the inlet line, and overflows within the gas-liquid separator. LPG fuel including an overflow line that transfers the gas to the inlet line, a first discharge line that discharges gas separated by a gas-liquid separator to the outside, and a second discharge line that vaporizes the liquid separated by the gas-liquid separator and discharges it to the outside. Provide emergency gas discharge system.

In addition, at least one of the inlet line, overflow line, first discharge line, and second discharge line is formed in a double pipe structure with an internal pipe inside the external pipe, and transfers LPG through the internal pipe, and the internal pipe The LPG fuel gas emergency discharge system in which water flows is provided in the space between the pipe and the external pipe.

On the other hand, in another aspect of the present invention for solving the problems as described above, it provides a ship including the LPG fuel gas emergency discharge system of the above-described configuration.

In addition, in another aspect of the present invention for solving the problems as described above, there is provided an offshore structure including the LPG fuel gas emergency discharge system of the above-described configuration.

The LPG fuel gas emergency discharge system according to an embodiment of the present invention can be easily applied to a ship or offshore structure using LPG, and when an emergency situation occurs in which LPG leaks from the fuel tank in which LPG is stored, a fuel tank equipped with a fuel tank Water is sprayed into the receiving part to dilute the leaked LPG, and at the same time, the leaked LPG can be quickly discharged to the leaked fuel discharge part along with water, and the discharged leaked LPG is separated from the leaked fuel treatment part by gas-liquid separation, and then safely discharged to the outside. can do.

In addition, by forming the piping line of the leaked fuel processing unit that treats leaked LPG and discharges it to the outside in a double piping structure, and by flowing water between the inner piping and the external piping of the double piping, an explosion accident is prevented even when a leak occurs in the internal piping. Can be effectively prevented.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those of ordinary skill in the art from the following description. will be.

1 shows the overall configuration of an emergency LPG fuel gas discharge system according to an embodiment of the present invention.
2 and 3 are plan views and side views showing the internal structure of a fuel tank receiving unit provided in the emergency discharge system according to an embodiment of the present invention.
4 is a diagram illustrating a configuration of a leaked fuel processing unit provided in an emergency LPG fuel gas discharge system according to an embodiment of the present invention.
5 shows a piping structure of a leaked fuel processing unit according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The detailed description to be disclosed hereinafter together with the accompanying drawings is intended to describe exemplary embodiments of the present invention, and is not intended to represent the only embodiments in which the present invention may be practiced.

In the drawings, parts irrelevant to the description may be omitted in order to clearly describe the present invention, and the same reference numerals may be used for the same or similar components throughout the specification.

In an embodiment of the present invention, expressions such as "or" and "at least one" may represent one of words listed together, or a combination of two or more.

1 shows the overall configuration of an emergency LPG fuel gas discharge system 100 according to an embodiment of the present invention, and FIGS. 2 and 3 are provided in the emergency discharge system 100 according to an embodiment of the present invention. The internal structure of the fuel tank receiving part 110 is shown in plan view and from the side.

The LPG fuel gas emergency discharge system 100 according to an embodiment of the present invention is installed in an LPG fuel propulsion ship using LPG (Liquefied petroleum gas) as a fuel or an offshore structure using LPG, and a fuel tank 10 in which LPG is stored. In the event of an emergency situation in which LPG leaks in ), the leaked LPG can be safely and quickly discharged to the outside for treatment.

Hereinafter, a description will be given of the LPG fuel gas emergency discharge system 100 provided in the LPG fuel propulsion ship as a representative embodiment.

1 to 3, the LPG fuel gas emergency discharge system 100 according to an embodiment of the present invention includes a fuel tank receiving unit 110, an air supply pipe 120, an air ventilation 130, A leak detection unit (not shown), a leaked fuel discharge unit 140, and a control unit (not shown) may be included.

The fuel tank receiving unit 110 may be provided in a ship, and a fuel tank 10 in which LPG is stored may be installed.

Specifically, the fuel tank receiving unit 110 may be formed in the form of a room accommodating the fuel tank 10 in the ship, and the fuel tank 10 is provided with the fuel tank 10 in a sealed inner space. ), and at the same time, it may be formed to prevent LPG leakage or external damage caused by a fire occurring in the fuel tank 10.

In addition, an air supply pipe 120, an air ventilation 130, a leak detection unit (not shown), and a leak fuel discharge unit 140 may be installed in the fuel tank receiving unit 110.

The air supply pipe 120 is provided on one side of the upper portion of the fuel tank receiving portion 110 and may supply air into the fuel tank receiving portion 110.

The air ventilation 130 is provided to be opened and closed on the other side of the upper portion of the fuel tank receiving unit 110, and exhaust air introduced into the fuel tank receiving unit 110 to the outside to ventilate it.

In addition, the air ventilation 130 may be operated by a control unit (not shown) to be described later to be closed to block air discharge when an emergency situation such as LPG leakage from the fuel tank 10 occurs.

The leak detection unit (not shown) is provided inside the fuel tank receiving unit 110 or in the fuel tank 10, and may detect LPG leaking from the fuel tank 10.

As an example, the leak detection unit (not shown) may include a plurality of gas detection sensors 162a, and may transmit a detection signal according to LPG leakage to a control unit (not shown).

The leaked fuel discharge unit 140 is provided to be opened and closed below the fuel tank receiving unit 110, and discharges LPG leaking from the fuel tank 10 to the outside of the fuel tank receiving unit 110 to be described later. It may be introduced into the processing unit 160.

Here, the leaked fuel processing unit 160 may process the LPG introduced through the leaked fuel discharge unit 140 and discharge it to the outside of the ship, and a detailed description thereof will be described later.

As an example, the leaked fuel discharge unit 140 opens and closes the drip tray 141 provided on the bottom of the fuel tank receiving unit 110 and the discharge pipe 142 and the discharge pipe 142 connected to the drip tray 141 It may include an on-off valve (not shown).

Here, the drip tray 141 may be formed to be inclined to allow liquid to flow out, and the discharge pipe 142 connected to the drip tray 141 may be provided to be opened and closed by an opening/closing valve (not shown).

In addition, the opening/closing valve (not shown) operates under the control of a control unit (not shown), so that the discharge pipe 142 is normally closed, and when an emergency occurs, the discharge pipe 142 is opened to leak from the fuel tank 10. LPG may be discharged to the outside of the fuel tank receiving unit 110 through the discharge pipe 142.

The control unit (not shown) may control the operation of the air ventilation 130 and the leaked fuel discharge unit 140 according to a detection signal from the leak detection unit (not shown).

That is, when the control unit (not shown) receives a detection signal due to LPG leakage from the leak detection unit (not shown), the air ventilation 130 is closed, and the opening/closing valve of the leaked fuel discharge unit 140 (not shown) Through the discharge pipe 142 can be opened.

Specifically, the air supplied to the inside of the fuel tank receiving unit 110 through the air supply pipe 120 is discharged to the outside through the air ventilation 130, so that the fuel tank 10 is disposed. The interior of the tank receiving unit 110 may be ventilated. In the event of an emergency situation in which LPG leaks from the fuel tank 10, the air ventilation 130 is closed under the control of a control unit (not shown) and the leaked fuel discharge unit By opening 140, the leaked LPG can be discharged through the leaked fuel discharge unit 140 at the pressure of the air supplied from the air supply pipe 120.

At this time, since LPG is heavier than air, the LPG leaking from the fuel tank 10 stays at the lower side in the fuel tank receiving unit 110, and the air supply pipe 120 is opened from the top of the fuel tank receiving unit 110. As air is continuously supplied through the fuel tank receiving unit 110, the leaked LPG in the fuel tank receiving unit 110 may be discharged to the discharge pipe 142 of the leaked fuel discharge unit 140 together with the air.

Meanwhile, the LPG fuel gas emergency discharge system 100 according to the present embodiment may further include a water spray unit 150 for injecting water into the fuel tank receiving unit 110.

The water spray unit 150 may be formed of a sprinkler, and may be provided at an upper portion of the fuel tank receiving unit 110.

The water injection unit 150 may include a plurality of injection nozzles, and when an emergency situation occurs in which LPG leaks from the fuel tank 10, it operates under the control of a control unit (not shown), and the fuel tank receiving unit Water may be supplied from a water supply pipe provided on the ceiling of 110 and spray water through the spray nozzle.

At this time, the water sprayed from the water spray unit 150 is mixed with the leaking LPG to dilute the LPG, thereby reducing the risk of explosion.

In addition, water sprayed from the water spray unit 150 may be discharged to the discharge pipe 142 along with the leaked LPG and air along the inclined drip tray 141 of the leaked fuel discharge unit 140.

Moreover, the water spray unit 150 may extinguish a fire by spraying water when a fire occurs due to LPG.

In addition, the LPG fuel gas emergency discharge system 100 according to the present embodiment may include a leaked fuel processing unit 160 that processes the leaked LPG introduced through the leaked fuel discharge unit 140 and discharges it to the outside of the ship. .

4 is a diagram showing the configuration of a leaked fuel processing unit 160 provided in the emergency LPG fuel gas discharge system 100 according to an embodiment of the present invention, and FIG. 5 is a leakage fuel processing unit according to an embodiment of the present invention. It shows the piping structure of 160.

Referring to FIG. 4, the leaked fuel processing unit 160 gas-liquid separates the inlet line 161 extending from the discharge pipe 142 of the leaked fuel discharge unit 140 and the leaked LPG flowing through the inlet line 161. A gas-liquid separator 162, an overflow line 163 connected between the gas-liquid separator 162 and the inlet line 161, and a first discharge line 164 for discharging the gas separated through the gas-liquid separator 162 to the outside. ) And a second discharge line 165 that vaporizes the liquid separated through the gas-liquid separator 162 and discharges it to the outside.

Here, the inlet line 161 may transfer influents such as leaked LPG, air and water introduced through the discharge pipe 142 to the gas-liquid separator 162.

In addition, the gas-liquid separator 162 separates and discharges water from the influent flowing through the inlet line 161 and separates leaked LPG into gas and liquid.

At this time, the gas separated by the gas-liquid separator 162 may be transported along with the air along the first discharge line 164 and discharged to the outside of the ship through the vent mast 164a.

In addition, the liquid separated by the gas-liquid separator 162 is transported along the second discharge line 165, and vaporized into a gaseous state by the vaporizer 166 provided on the second discharge line 165, and the vent mast 165a ) Can be discharged to the outside of the ship.

In addition, when the amount of leaked LPG flowing into the inlet line 161, the inlet such as air and water increases, and the LPG flowing into the gas-liquid separator 162 overflows, the overflow line 163 is opened and overflows. The flowing LPG can be transferred to the inflow line 161.

As an example, the gas-liquid separator 162 may include a detection sensor 162a for detecting a change in the level of the stored LPG, and the overflow line 163 may be opened or closed according to a signal from the detection sensor 162a.

In addition, referring to FIG. 5, piping lines such as the inlet line 161, the overflow line 163, the first discharge line 164 and the second discharge line 165 provided in the leaked fuel processing unit 160 are It can be formed in a double pipe structure.

Specifically, the piping line of the double piping structure is a structure in which an internal pipe (P2) having a diameter smaller than the external pipe (P1) is provided inside the external pipe (P1), and LPG, air and air through the internal pipe (P2) Inflows such as water can be transported, and water can flow into the space between the inner pipe P2 and the outer pipe P1.

At this time, an injection pipe 171 for injecting water between the inner pipe P2 and the outer pipe P1 may be connected to one side of the outer pipe P1, and the other side may be connected between the inner pipe P2 and the outer pipe P1. A drain pipe 172 for discharging the flowing water to the leaked fuel discharge unit 140 may be connected.

Here, the drain pipe 172 may discharge water to the drip tray 141 or the discharge pipe 142 of the leaked fuel discharge unit 140, and the discharged water is gas-liquid through the discharge pipe 142 and the inlet line 161 It may be introduced into the separator 162.

In the case of an emergency situation in which LPG leaks from the fuel tank 10, the injection pipe 171 is opened so that water can be injected between the inner pipe (P2) and the outer pipe (P1). In addition, the injected water may flow around the outer surface of the inner pipe P2 and be discharged to the leaked fuel discharge unit 140 through the drain pipe 172.

Through this, when an unknown LPG leak occurs in the inner pipe (P2), the leaked LPG is diluted in water flowing between the inner pipe (P2) and the outer pipe (P1), and the leaked fuel discharge unit 140 with water. ) May be discharged, and the discharged LPG and water may be introduced into the gas-liquid separator 162 through the discharge pipe 142 and the inlet line 161.

In addition, as an example, a detection sensor (not shown) capable of detecting leakage due to a crack in the internal pipe P2 is provided, and when a detection signal is generated by a detection sensor (not shown), the injection pipe 171 Water can be injected between the inner pipe (P2) and the outer pipe (P1) by opening.

In this way, the LPG fuel gas emergency discharge system 100 according to the present embodiment, when an emergency situation occurs in which LPG leaks from the fuel tank 10, dilutes the leaked LPG by injecting water through the water spraying unit 150 At the same time, the leaked LPG can be quickly discharged to the leaked fuel discharge unit 140 with water at the pressure of the air supplied from the air supply pipe 120, and the discharged leaked LPG is gas-liquid from the leaked fuel treatment unit 160. It can be separated and treated separately and safely discharged to the outside of the ship.

In addition, by forming the piping line of the leaked fuel processing unit 160 that transports the leaked LPG in a double piping structure and flowing water between the inner piping (P2) and the external piping (P1) of the double piping, cracks in the internal piping (P2). Even in the event of such occurrence, explosion accidents caused by LPG leakage can be effectively prevented.

Meanwhile, the operation of the LPG fuel gas emergency discharge system 100 provided in the ship according to this embodiment will be described below with reference to the accompanying drawings.

Referring to FIGS. 1 to 5, as an example, an LPG fuel gas emergency discharge system 100 may be provided in an LPG fuel-propelled ship using LPG as a fuel.

The fuel tank 10 may be accommodated and disposed in the fuel tank receiving unit 110 having a barrier structure provided in the ship, and the LPG stored therein is supplied to a demand source such as an engine or a generator through the fuel supply system 20 in the ship. 30) can be supplied.

Here, the fuel supply system 20 may include an LPG supply line and various sensors and valve units, and the valve unit may control the flow rate or pressure of LPG supplied to the customer 30, and the fuel tank 10 LPG supply can be cut off in case of an emergency situation where LPG is leaked from

Meanwhile, air may be supplied to the inside through the air supply pipe 120 to the fuel tank receiving unit 110 in which the fuel tank 10 is normally installed, and the supplied air is supplied to the outside through the air ventilation 130. By being discharged, the inside of the fuel tank receiving part 110 may be ventilated.

In addition, when an emergency situation occurs in which LPG leaks from the fuel tank 10, the air ventilation 130 is closed and provided on the bottom of the fuel tank receiving unit 110 by the control of a control unit (not shown). As the leaked fuel discharge unit 140 is opened, the leaked LPG can be discharged through the leaked fuel discharge unit 140 at the pressure of air supplied from the air supply pipe 120.

In this process, water may be injected from the water spray unit 150 provided on the ceiling side of the fuel tank receiving unit 110, and the injected water is mixed with LPG leaking from the fuel tank 10 to dilute the LPG. It can reduce the risk of explosion.

In addition, water sprayed from the water spray unit 150 may be discharged to the discharge pipe 142 along with the leaked LPG and air along the inclined drip tray 141 of the leaked fuel discharge unit 140.

Subsequently, the inflow of LPG, air and water discharged to the discharge pipe 142 of the leaked fuel discharge unit 140 may be transferred to the gas-liquid separator 162 along the inlet line 161, and the gas-liquid separator 162 ), water is separated and discharged, and leaked LPG can be separated into gas and liquid.

At this time, the gas separated by the gas-liquid separator 162 is discharged to the outside of the ship through the first discharge line 164, and the liquid is transferred along the second discharge line 165 on the second discharge line 165. It may be vaporized by the carburetor 166 provided in and discharged to the outside of the ship.

Meanwhile, in the above-described embodiment, the LPG fuel gas emergency discharge system 100 that is typically provided in an LPG fuel-propelled ship has been described, but the same can be applied to offshore structures using LPG.

As described above, the LPG fuel gas emergency discharge system 100 according to the embodiment of the present invention can be easily applied to a ship or offshore structure using LPG, and LPG leaks from the fuel tank 10 in which LPG is stored. In the event of an emergency situation, water is injected into the fuel tank receiving unit 110 in which the fuel tank 10 is installed to dilute the leaked LPG, and at the same time, the leaked LPG can be quickly discharged to the leaked fuel discharge unit 140 together with water. The gas-liquid separation of the leaked LPG from the discharged fuel processing unit 160 and processing each can be safely discharged to the outside.

In addition, the piping line of the leaked fuel processing unit 160 that treats the leaked LPG and discharges it to the outside is formed in a double piping structure, and water flows between the inside piping (P2) and the outside piping (P1) of the double piping. Even if leakage occurs in P2), an explosion accident can be effectively prevented.

The embodiments of the present invention disclosed in the present specification and drawings are only provided for specific examples to easily explain the technical content of the present invention and to aid understanding of the present invention, and are not intended to limit the scope of the present invention.

Therefore, the scope of the present invention should be construed that all changes or modified forms derived based on the technical idea of the present invention in addition to the embodiments disclosed herein are included in the scope of the present invention.

10: fuel tank 20: fuel supply system
30: customer 100: LPG fuel gas emergency discharge system
110: fuel tank receiving part 120: air supply pipe
130: air ventilation 140: leaked fuel discharge
150: water injection unit 160: leakage fuel treatment unit
161: inlet line 162: gas-liquid separator
163: overflow line 164: first discharge line
165: second discharge line 171: injection pipe
172: drain pipe P1: external pipe
P2: Internal piping

Claims (8)

A fuel tank accommodating part in which a fuel tank storing LPG is installed in a sealed interior space;
An air supply pipe provided above the fuel tank receiving part and supplying air into the fuel tank receiving part;
An air ventilation provided to be opened and closed on an upper portion of the fuel tank accommodating portion and ventilating the air introduced into the fuel tank accommodating portion to the outside;
A leak detection unit for detecting LPG leaking from the fuel tank;
A water injection unit provided above the fuel tank receiving unit and injecting water when LPG leaks;
A leaked fuel discharge unit provided to be opened and closed below the fuel tank receiving unit and configured to discharge the leaked LPG to the outside; And
When LPG leakage is detected by the leak detection unit, water is injected through the water injection unit to move the leaked LPG to the lower space of the fuel tank receiving unit, close the air ventilation, and discharge the leaked fuel. An emergency LPG fuel gas discharge system comprising a control unit to open the part and control the leaked LPG to be forcibly discharged to the leaked fuel discharge part together with the injected water through the pressure of the air supplied from the air supply pipe.
delete The method of claim 1,
The leaked fuel discharge unit,
A drip tray provided inclined to allow liquid to flow out of the fuel tank receiving portion;
A discharge pipe connected to the drip tray; And
LPG fuel gas emergency discharge system comprising an on-off valve for opening and closing the discharge pipe under the control of the control unit.
The method of claim 1,
Further comprising a leaked fuel treatment unit for discharging to the outside by processing the leaked LPG discharged with water through the leaked fuel discharge unit,
The leaked fuel processing unit,
An inlet line connected to the leaked fuel discharge unit;
A gas-liquid separator for gas-liquid separating water and leaked LPG flowing through the inlet line;
An overflow line connected between the gas-liquid separator and the inlet line and transferring water and LPG overflowing in the gas-liquid separator to the inlet line;
A first discharge line for discharging the gas separated by the gas-liquid separator to the outside; And
LPG fuel gas emergency discharge system comprising a second discharge line for vaporizing the liquid separated by the gas-liquid separator to discharge to the outside.
delete The method of claim 4,
At least one of the inlet line, the overflow line, the first discharge line and the second discharge line is formed in a double pipe structure having an inner pipe inside the outer pipe,
The inner pipe transports LPG,
In the external pipe, an injection pipe for injecting water into the space between the internal pipe and the external pipe is connected on one side, and a drain pipe for discharging the water flowing between the internal pipe and the external pipe to the leaked fuel discharge part is on the other side. Connected,
When LPG leaks from the internal pipe, the leaked LPG is discharged to the leaked fuel discharge unit through the flowing water, and LPG remaining in the leaked fuel discharge unit is discharged using the discharged water and LPG. LPG fuel gas emergency discharge system for collecting and flowing into the inlet line.
A ship comprising the LPG fuel gas emergency discharge system of any one of claims 1, 3, 4 and 6.
An offshore structure comprising the LPG fuel gas emergency discharge system of any one of claims 1, 3, 4 and 6.

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