Nitrogen pressurization system for leak testing of gas piping for engines and a ship comprising the same

Abstract

The nitrogen pressurization system for leak testing of gas piping for an engine according to the present invention includes: a nitrogen generator (100) disposed on the hull (S) and generating nitrogen; a nitrogen storage tank (200) for storing nitrogen generated from the nitrogen generator (100); an air compressor (300) for generating compressed air to facilitate the starting of an engine (E) propelling the hull (S) and supplying compressed air to the engine (E); an air supply unit (400) for supplying air to the air compressor (300); and A first switching valve (DV1) is installed on a first switching pipe (DL1) connecting the air supply unit (400), the nitrogen storage tank (200), and the air compressor (300), and is adjusted to supply either air or nitrogen to the air compressor (300). When nitrogen is supplied to the air compressor (300) by adjusting the first switching valve (DV1), the gas pipe (GL) connected to the engine (E) is purged with compressed nitrogen pressurized by the air compressor (300).

Description

Technical Field

[0001] The present invention relates to a nitrogen pressurization system for leak testing of gas piping for an engine and a ship including the same, and more specifically, to a nitrogen pressurization system for leak testing of gas piping for supplying fuel to a marine engine and a ship including the same. Background Technology

[0002] Typically, ME-GI (High Pressure Dual Fuel Propulsion) engines use fuel gas pressurized to approximately 300 bar. Accordingly, fuel gas is supplied to the ME-GI engine after leak testing of the gas piping is performed to ensure the stability of the gas piping.

[0003] Recently, there have been attempts to apply the ME-GA (low-pressure dual-fuel propulsion) engine as a dual-fuel propulsion engine. Because the ME-GA engine uses low-pressure fuel gas at 10 to 15 bar, the pressure of the fuel gas is significantly lower than that of the ME-GI engine.

[0004] In ME-GI (High Pressure Dual Fuel Propulsion) engines, gas piping leak tests are performed using nitrogen (N2). Approximately 6 bar of nitrogen generated in the ship's nitrogen generation unit is pressurized to approximately 300 bar in a separate compressor for gas piping leak testing. In ME-GA (Low Pressure Dual Fuel Propulsion) engines, gas piping leak tests are also performed by pressurizing approximately 6 bar of nitrogen generated in the ship's nitrogen generation unit to approximately 15 bar in a separate compressor. Such compressors are expensive and have small capacity, requiring approximately 4 hours of pressurization time, thus increasing the time required for gas piping leak testing. Summary of the Invention

[0005] Technical issues

[0006] Therefore, the present invention provides a nitrogen pressurization system for leak testing of gas piping for engines, which can reduce the time required for leak testing of gas piping at low cost, and a ship including the same.

[0007] Technical solution

[0008] A nitrogen pressurization system for leak testing of gas piping for an engine, according to an embodiment of the present invention, includes: a nitrogen generator 100 disposed on a hull S and generating nitrogen; a nitrogen storage tank 200 for storing the nitrogen generated from the nitrogen generator 100; an air compressor 300 for generating compressed air to facilitate the starting of an engine E propelling the hull S and supplying the compressed air to the engine E; an air supply unit 400 for supplying air to the air compressor 300; and a first switching valve DV1 disposed on a first switching pipe DL1 connecting the air supply unit 400, the nitrogen storage tank 200, and the air compressor 300, and adjusted to supply either the air or the nitrogen to the air compressor 300.

[0009] When nitrogen is supplied to the air compressor 300 by adjusting the first switching valve DV1, the compressed nitrogen pressurized by the air compressor 300 can be used to purge the gas piping GL connected to the engine E.

[0010] At this time, the nitrogen pressurization system for leak testing of the gas piping for the engine may further include: an air storage tank 500 for storing the compressed air generated from the air compressor 300; and a second switching valve DV2, disposed on a second switching pipe DL2 connecting the air compressor 300 and the air storage tank 500, and adjusted to supply the compressed air to the air storage tank 500 or the compressed nitrogen to the gas piping GL.

[0011] In addition, the nitrogen pressurization system for leak testing of the gas piping for the engine may also include: a first nitrogen pressure reducing valve RV1, disposed on the first switching piping DL1, for reducing the pressure of the nitrogen supplied from the nitrogen storage tank 200 and supplying it to the air compressor 300.

[0012] In addition, the nitrogen pressurization system for leak testing of the gas piping for the engine may also include: an initial purge valve IPV, disposed between the second switching valve DV2 and the gas piping GL.

[0013] When nitrogen is supplied to the air compressor 300 by adjusting the first switching valve DV1, the compressed air can be discharged to the outside by adjusting the second switching valve DV2 and the initial purge valve IPV.

[0014] In addition, the nitrogen pressurization system for leak testing of the gas piping for the engine may also include: a second nitrogen pressure reducing valve RV2, disposed on the gas piping GL downstream of the initial purge valve IPV, for reducing the pressure of the compressed nitrogen and supplying it to the gas piping GL.

[0015] In addition, the nitrogen pressurization system for leak testing of the gas piping for the engine may also include: a nitrogen purging valve NPV, which is installed on the nitrogen supply piping NSL connecting the nitrogen storage tank 200 and the gas piping GL, and supplies the nitrogen stored in the nitrogen storage tank 200 to the gas piping GL.

[0016] Additionally, according to another embodiment of the present invention, a ship including a nitrogen pressurization system for leak testing of gas piping for an engine includes: a hull S; an engine room ER including an engine E for propelling the hull S; and a fuel supply room FR including a fuel supply system FSS for supplying fuel gas to the engine E, wherein the engine room ER further includes: a nitrogen pressurization system NCS for leak testing, which pressurizes the nitrogen for leak testing of the gas piping of the fuel supply system FSS, wherein the nitrogen pressurization system NCS includes: a nitrogen generator 100 disposed in the engine room. The engine room ER generates nitrogen; a nitrogen storage tank 200 stores nitrogen generated from the nitrogen generator 100; an air compressor 300 generates compressed air to aid in starting the engine E and supplies the compressed air to the engine E; an air supply unit 400 supplies air to the air compressor 300; and a first switching valve DV1 is disposed on a first switching pipe DL1 connecting the air supply unit 400, the nitrogen storage tank 200, and the air compressor 300, and is adjusted to supply either air or nitrogen to the air compressor 300.

[0017] When nitrogen is supplied to the air compressor 300 by adjusting the first switching valve DV1, the compressed nitrogen pressurized by the air compressor 300 can be used to purge the gas piping GL.

[0018] At this time, the nitrogen pressurization system NCS for leak testing may further include: an air storage tank 500 for storing the compressed air generated from the air compressor 300; and a second switching valve DV2, which is disposed on a second switching pipe DL2 connecting the air compressor 300 and the air storage tank 500, and is adjusted to supply the compressed air to the air storage tank 500 or to supply the compressed nitrogen to the gas pipe GL.

[0019] In addition, the nitrogen pressurization system NCS for leak testing may also include: a first nitrogen pressure reducing valve RV1, which is installed on the first switching pipe DL1 to reduce the pressure of the nitrogen supplied from the nitrogen storage tank 200 and supply it to the air compressor 300.

[0020] In addition, the nitrogen pressurization system NCS for leak testing may also include: an initial purge valve IPV, located between the second switching valve DV2 and the gas piping GL.

[0021] When nitrogen is supplied to the air compressor 300 by adjusting the first switching valve DV1, the compressed air can be discharged to the outside by adjusting the second switching valve DV2 and the initial purge valve IPV.

[0022] In addition, the nitrogen pressurization system NCS for leak testing may also include: a second nitrogen pressure reducing valve RV2, which is located on the gas pipeline GL downstream of the initial purge valve IPV, to reduce the pressure of the compressed nitrogen and supply it to the gas pipeline GL.

[0023] In addition, the nitrogen pressurization system NCS for leak testing may also include a nitrogen purging valve NPV, which is installed on the nitrogen supply pipe NSL that connects the nitrogen storage tank 200 and the gas pipe GL, and supplies the nitrogen stored in the nitrogen storage tank 200 to the gas pipe GL.

[0024] In addition, the gas piping GL may include: a main gas piping MGL, connecting the fuel supply system FSS and the engine E; a first gas piping GL1, connecting the initial purge valve IPV and the engine E, and supplying compressed nitrogen for leak testing to the engine E before starting the engine E; and a second gas piping GL2, connecting the first gas piping GL1 and the main gas piping MGL.

[0025] Additionally, the engine may include a ME-GA (low-pressure dual-fuel propulsion) engine.

[0026] Technical effect

[0027] According to an embodiment of the present invention, a nitrogen pressurization system for leak testing of gas piping for an engine and a ship including the same, nitrogen is pressurized by an air compressor that supplies compressed air to the engine to aid in engine start-up to generate compressed nitrogen, and the generated compressed nitrogen is used to perform leak testing of the gas piping, thereby eliminating the need for a separate, high-cost compressor for generating compressed nitrogen, and thus enabling leak testing at a low cost.

[0028] Furthermore, since the air compressor that supplies compressed air to the engine to help start the engine has a capacity that is more than 10 times larger than that of a standalone compressor, the time required for leak testing of gas piping can be shortened. Attached Figure Description

[0029] Figure 1This is a schematic diagram of a ship including a nitrogen pressurization system for leak testing of gas piping for an engine according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of a nitrogen pressurization system for leak testing of gas piping for an engine, according to an embodiment of the present invention. Detailed Implementation

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the invention. The present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0032] Figure 1 This is a schematic diagram of a ship including a nitrogen pressurization system for leak testing of gas piping for an engine according to an embodiment of the present invention.

[0033] like Figure 1 As shown, a ship including a nitrogen pressurization system (NCS) for leak testing of gas piping for an engine according to an embodiment of the present invention includes: a hull (S); an engine room (ER); and a fuel supply room (FR), including a fuel supply system (FSS) for supplying fuel gas to the engine (E).

[0034] The hull S can include various types of hulls such as container ship hulls and liquefied gas ship hulls.

[0035] The engine room ER may include an engine E for propelling the hull S and a nitrogen (N2) pressurization system NCS for leak testing. Engine E may be a ME-GA (low-pressure dual-fuel propulsion) engine utilizing low-pressure fuel gas at 10 to 15 bar. The nitrogen (N2) pressurization system NCS pressurizes the nitrogen (N2) for leak testing in the gas piping GL of the fuel supply system FSS to generate compressed nitrogen, and supplies the generated compressed nitrogen to the gas piping GL of the fuel supply system FSS for leak testing of the gas piping GL.

[0036] The fuel supply chamber FR may include a fuel supply system FSS that supplies fuel gas to the engine E.

[0037] The following is a detailed description of a nitrogen pressurization system for leak testing of gas piping for an engine according to an embodiment of the present invention.

[0038] Figure 2 This is a schematic diagram of a nitrogen pressurization system for leak testing of gas piping for an engine, according to an embodiment of the present invention.

[0039] like Figure 2As shown, a nitrogen pressurization system for leak testing of gas piping for an engine according to an embodiment of the present invention includes a nitrogen generator 100, a nitrogen storage tank 200, an air compressor 300, an air supply unit 400, an air storage tank 500, a first switching valve DV1, a second switching valve DV2, an initial purge valve IPV, a first nitrogen pressure reducing valve RV1, and a second nitrogen pressure reducing valve RV2.

[0040] The nitrogen generator 100 is located in the engine room ER inside the hull S and is capable of generating nitrogen N2.

[0041] A nitrogen storage tank 200 is disposed adjacent to a nitrogen generator 100 in the engine compartment ER, and is capable of storing nitrogen generated from the nitrogen generator 100. The nitrogen stored in the nitrogen storage tank 200 can have a pressure of approximately 6 bar.

[0042] Air compressor 300 uses air received from air supply unit 400 to generate compressed air that aids in the starting and regulation of engine E. After being stored in air storage tank 500, the compressed air generated in air compressor 300 can be supplied to engine E via compressed air piping CAL. The compressed air can have a pressure of approximately 30 bar. Additionally, compressed air can be supplied to dual-loop piping DCL via engine connection piping ECL, which connects compressed air piping CAL and dual-loop piping DCL of engine E. An air pressure reducing unit ARU and a flow switch FS can be installed on engine connection piping ECL. The air pressure reducing unit ARU can supply 30 bar compressed air or dried recirculated air (compressed nitrogen reduced to approximately 0.5 bar) to dual-loop piping DCL of engine E. The flow switch FS confirms that the recirculated air through the air pressure reducing unit ARU is being supplied properly to dual-loop piping DCL of engine E. When recirculated air does not flow into dual-loop piping DCL of engine E, engine E stops operating.

[0043] The air supply unit 400 can supply air to the air compressor 300. The air supply unit 400 can receive air by drawing in the atmosphere.

[0044] Air storage tank 500 can store compressed air generated from air compressor 300. The compressed air stored in air storage tank 500 is supplied to engine E to assist in starting and regulating engine E. The amount of compressed air stored in air storage tank 500 is sufficient to start the engine more than twelve times.

[0045] The first switching valve DV1 can be installed on the first switching pipe DL1 connecting the air supply unit 400, the nitrogen storage tank 200, and the air compressor 300. This first switching valve DV1 can be a three-way valve. The first switching pipe DL1 may include a first-first switching pipe DL11 connecting the air supply unit 400 and the first switching valve DV1, a first-second switching pipe DL12 connecting the nitrogen storage tank 200 and the first switching valve DV1, and a first-third switching pipe DL13 connecting the first switching valve DV1 and the air compressor 300.

[0046] By adjusting the first switching valve DV1, either air or nitrogen can be supplied to the air compressor 300.

[0047] In the operating mode where engine E is running, the first switching valve DV1 can be adjusted to connect the first-1 switching pipe DL11 and the first-3 switching pipe DL13, thereby supplying air from the air supply unit 400 to the air compressor 300 to generate compressed air. Furthermore, in the stop mode where engine E is stopped, the first switching valve DV1 can be adjusted to connect the first-2 switching pipe DL12 and the first-3 switching pipe DL13, thereby supplying nitrogen from the nitrogen storage tank 200 to the air compressor 300 to generate compressed nitrogen.

[0048] The second switching valve DV2 can be installed on the second switching pipe DL2 connecting the air compressor 300 and the air storage tank 500. This second switching valve DV2 can be a three-way valve. The second switching pipe DL2 may include a second-first switching pipe DL21 connecting the air compressor 300 and the second switching valve DV2, a second-second switching pipe DL22 connecting the second switching valve DV2 and the air storage tank 500, and a second-third switching pipe DL23 connecting the second switching valve DV2 and the initial purge valve IPV.

[0049] By adjusting the second switching valve DV2, compressed air generated in the air compressor 300 can be supplied to the air storage tank 500, or compressed nitrogen generated in the air compressor 300 can be supplied to the gas pipeline GL.

[0050] In the operating mode where engine E is running, the second switching valve DV2 can be adjusted to connect the 2-1 switching pipe DL21 and the 2-2 switching pipe DL22, thereby supplying compressed air generated in the air compressor 300 to the air storage tank 500 for supplying to the dual-loop pipe DCL of engine E. Furthermore, in the stop mode where engine E is stopped, the second switching valve DV2 can be adjusted to connect the 2-1 switching pipe DL21 and the 2-3 switching pipe DL23, thereby supplying compressed nitrogen generated in the air compressor 300 to the gas pipe GL. The compressed nitrogen supplied to the gas pipe GL can be used to purge the gas pipe GL for a leak test. The gas pipe GL may include the main gas pipe MGL, the first gas pipe GL1, and the second gas pipe GL2.

[0051] The main gas line (MGL) connects the fuel supply system (FSS) and the engine (E), and supplies fuel gas from the FSS to the engine (E). The main gas line (MGL) may be equipped with a gas valve train (GVT), a main gas valve (MGV), and a main exhaust valve (MBV). The GVT regulates the supply pressure of fuel gas to the engine (E). Furthermore, in the event of a gas trip, the GVT can vent fuel gas from the main gas line (MGL) or purge it with compressed gas. The MGV may be located upstream of the GVT and can cut off the fuel gas supply to the engine (E) in an emergency. The MBV can be used to vent fuel gas from the main gas line (MGL) to the outside or to purge the main gas line (MGL).

[0052] The first gas line GL1 can connect the initial purge valve IPV and the engine E. Before starting the engine E, the first gas line GL1 can supply compressed nitrogen for leak testing to the engine E. A first nitrogen purge block PB1 can be provided on the first gas line GL1. The first nitrogen purge block PB1 can be a valve assembly that supplies compressed nitrogen to the first gas line GL1 to purge the first gas line GL1 in a stop mode when the engine E is stopped. The first nitrogen purge block PB1 may include: a first dual control valve DCV1 to prevent fuel gas from flowing back into the first gas line GL1; and a first exhaust valve VV1 located between the first dual control valves DCV1 and discharging fuel gas to the outside in the event of a leak.

[0053] The second gas piping GL2 can connect the first gas piping GL1 and the main gas piping MGL. A second nitrogen purging block PB2 can be installed on the second gas piping GL2. The second nitrogen purging block PB2 can be a valve assembly that supplies compressed nitrogen to the second gas piping GL2 upstream of the gas valve mechanism GVT for purging, discharging, and leak testing of the second gas piping GL2. The second nitrogen purging block PB2 may include: a second dual control valve DCV2 to prevent fuel gas from flowing back into the second gas piping GL2; and a second exhaust valve VV2 located between the second dual control valves DCV2, which discharges fuel gas to the outside in the event of a leak.

[0054] The initial purge valve IPV can be located between the second switching valve DV2 and the first gas line GL1. That is, the initial purge valve IPV can be a three-way valve connected to the second-third switching line DL23, the initial purge line IPL, and the first gas line GL1.

[0055] When nitrogen is supplied to the air compressor 300 by adjusting the first switching valve DV1, compressed air can be discharged to the outside through the initial purge pipe IPL for a predetermined period of time by adjusting the second switching valve DV2 and the initial purge valve IPV. The initial purge pipe IPL is connected to the dual-cycle pipe DCL of engine E via the engine connection pipe ECL. Therefore, compressed air initially remaining in the 2-1 switching pipe DL21 and the 2-3 switching pipe DL23 can be supplied to the dual-cycle pipe DCL of engine E through the initial purge pipe IPL to improve the function of the air compressor 300. Furthermore, compressed nitrogen can also be supplied to the dual-cycle pipe DCL of engine E through the initial purge pipe IPL to improve the function of the air compressor 300.

[0056] In addition, when air is supplied to the air compressor 300 by adjusting the first switching valve DV1, compressed nitrogen can also be discharged to the outside through the initial purging pipe IPL during a predetermined time period by adjusting the second switching valve DV2 and the initial purging valve IPV.

[0057] The first nitrogen pressure reducing valve RV1 can be installed on the first-second switching pipe DL12 of the first switching pipe DL1. When the gas pressure that the air compressor 300 can withstand has been determined, and it cannot withstand nitrogen gas with a pressure of 6 bar from inside the nitrogen storage tank 200, the first nitrogen pressure reducing valve RV1 can reduce the pressure of the nitrogen gas supplied from the nitrogen storage tank 200 to the air compressor 300 from 6 bar to atmospheric pressure, and then supply it to the air compressor 300.

[0058] The second nitrogen pressure reducing valve RV2 can be installed on the gas line GL downstream of the initial purge valve IPV. The second nitrogen pressure reducing valve RV2 can reduce the compressed nitrogen from 30 bar to 15 bar and supply it to the gas line GL.

[0059] The nitrogen purging valve NPV can be installed on the nitrogen supply pipe NSL that connects the nitrogen storage tank 200 and the gas pipe GL. In the stop mode of engine E-stop or in manual mode, the nitrogen purging valve NPV can supply nitrogen stored in the nitrogen storage tank 200 to the gas pipe GL at a pressure of 6 bar to purge the gas pipe GL.

[0060] As described above, the nitrogen pressurization system for leak testing of gas piping for an engine according to an embodiment of the present invention generates compressed nitrogen by pressurizing nitrogen using an air compressor 300 that supplies compressed air to the engine E to facilitate the starting of the engine E, a first switching valve DV1, and a second switching valve DV2, and uses the generated compressed nitrogen to perform leak testing on the gas piping GL, thereby eliminating the need for a separate, high-cost compressor for generating compressed nitrogen, and thus enabling leak testing at a low cost.

[0061] Furthermore, since the capacity of the air compressor 300, which supplies compressed air to engine E to aid in starting engine E, is more than 10 times larger than that of a standalone compressor, the time required for leak testing of the gas piping GL can be shortened.

[0062] Furthermore, since the nitrogen generator 100, nitrogen storage tank 200, air compressor 300, air supply unit 400 and air storage tank 500 are located in the engine compartment ER, it is easy to construct or arrange a nitrogen pressurization system for leak testing connected to the engine E.

[0063] The present invention has been described above with reference to the embodiments shown in the accompanying drawings. However, the present invention is not limited thereto, and various modifications or other embodiments equivalent to the present invention can be made by those skilled in the art. Therefore, the true scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A nitrogen pressurization system for leak testing of gas piping in an engine, comprising: A nitrogen generator (100) is installed on the hull (S) and generates nitrogen. A nitrogen storage tank (200) stores the nitrogen generated from the nitrogen generator (100); An air compressor (300) generates compressed air to aid in the starting of the engine (E) that propels the hull (S) and supplies the compressed air to the engine (E); An air supply unit (400) supplies air to the air compressor (300); as well as A first switching valve (DV1) is provided on a first switching pipe (DL1) connecting the air supply unit (400), the nitrogen storage tank (200), and the air compressor (300), and is adjusted to supply either air or nitrogen to the air compressor (300).

2. The nitrogen pressurization system for leak testing of gas piping for an engine as described in claim 1, wherein, When supplying nitrogen to the air compressor (300) by adjusting the first switching valve (DV1), the gas piping (GL) connected to the engine (E) is purged using compressed nitrogen pressurized by the air compressor (300).

3. The nitrogen pressurization system for leak testing of gas piping for an engine as described in claim 2, further comprising: An air storage tank (500) stores the compressed air generated from the air compressor (300); as well as A second switching valve (DV2) is provided on a second switching pipe (DL2) connecting the air compressor (300) and the air storage tank (500), and is adjusted to supply compressed air to the air storage tank (500) or compressed nitrogen to the gas pipe (GL).

4. The nitrogen pressurization system for leak testing of gas piping for an engine as described in claim 3, further comprising: A first nitrogen pressure reducing valve (RV1) is installed on the first switching pipe (DL1) to reduce the pressure of the nitrogen supplied from the nitrogen storage tank (200) and supply it to the air compressor (300).

5. The nitrogen pressurization system for leak testing of gas piping for an engine as described in claim 4, further comprising: An initial purge valve (IPV) is located between the second switching valve (DV2) and the gas piping (GL).

6. The nitrogen pressurization system for leak testing of gas piping for an engine as described in claim 5, wherein, When nitrogen is supplied to the air compressor (300) by adjusting the first switching valve (DV1), the compressed air is discharged to the outside by adjusting the second switching valve (DV2) and the initial purge valve (IPV).

7. The nitrogen pressurization system for leak testing of gas piping for an engine as described in claim 6, further comprising: A second nitrogen pressure reducing valve (RV2) is installed on the gas line (GL) downstream of the initial purge valve (IPV) to reduce the pressure of the compressed nitrogen and supply it to the gas line (GL).

8. The nitrogen pressurization system for leak testing of gas piping for an engine as described in claim 7, further comprising: A nitrogen purge valve (NPV) is installed on a nitrogen supply pipe (NSL) that connects the nitrogen storage tank (200) and the gas pipe (GL), and supplies the nitrogen stored in the nitrogen storage tank (200) to the gas pipe (GL).

9. A vessel comprising: Hull (S); Engine room (ER), including engines (E) that propel the hull (S); as well as The fuel supply compartment (FR) includes a fuel supply system (FSS) that supplies fuel gases to the engine (E). The engine compartment (ER) further includes a nitrogen pressurization system (NCS) for leak testing, which pressurizes nitrogen for leak testing in the gas piping of the fuel supply system (FSS). The nitrogen pressurization system (NCS) for leak testing includes: A nitrogen generator (100) is provided in the engine compartment (ER) and generates nitrogen. A nitrogen storage tank (200) stores nitrogen generated from the nitrogen generator (100); An air compressor (300) generates compressed air to aid in starting the engine (E) and supplies the compressed air to the engine (E); The air supply unit (400) supplies air to the air compressor (300); and A first switching valve (DV1) is provided on a first switching pipe (DL1) connecting the air supply unit (400), the nitrogen storage tank (200), and the air compressor (300), and is adjusted to supply either air or nitrogen to the air compressor (300).

10. The vessel as claimed in claim 9, wherein, When supplying nitrogen to the air compressor (300) by adjusting the first switching valve (DV1), the gas piping (GL) is purged with compressed nitrogen pressurized by the air compressor (300).

11. The vessel as claimed in claim 10, wherein, The nitrogen pressurization system (NCS) for leak testing also includes: An air storage tank (500) stores the compressed air generated from the air compressor (300); and A second switching valve (DV2) is provided on a second switching pipe (DL2) connecting the air compressor (300) and the air storage tank (500), and is adjusted to supply compressed air to the air storage tank (500) or compressed nitrogen to the gas pipe (GL).

12. The vessel as claimed in claim 11, wherein, The nitrogen pressurization system (NCS) for leak testing also includes: A first nitrogen pressure reducing valve (RV1) is installed on the first switching pipe (DL1) to reduce the pressure of the nitrogen supplied from the nitrogen storage tank (200) and supply it to the air compressor (300).

13. The vessel as claimed in claim 12, wherein, The nitrogen pressurization system (NCS) for leak testing also includes: An initial purge valve (IPV) is located between the second switching valve (DV2) and the gas piping (GL).

14. The vessel as claimed in claim 13, wherein, When nitrogen is supplied to the air compressor (300) by adjusting the first switching valve (DV1), the compressed air is discharged to the outside by adjusting the second switching valve (DV2) and the initial purge valve (IPV).

15. The vessel as claimed in claim 14, wherein, The nitrogen pressurization system (NCS) for leak testing also includes: A second nitrogen pressure reducing valve (RV2) is installed on the gas line (GL) downstream of the initial purge valve (IPV) to reduce the pressure of the compressed nitrogen and supply it to the gas line (GL).

16. The vessel as claimed in claim 15, wherein, The nitrogen pressurization system (NCS) for leak testing also includes: A nitrogen purge valve (NPV) is installed on a nitrogen supply pipe (NSL) that connects the nitrogen storage tank (200) and the gas pipe (GL), and supplies the nitrogen stored in the nitrogen storage tank (200) to the gas pipe (GL).

17. The vessel as claimed in claim 13, wherein, The gas piping (GL) includes: The main gas piping (MGL) connects the fuel supply system (FSS) and the engine (E); A first gas piping (GL1) connects the initial purge valve (IPV) and the engine (E), and supplies compressed nitrogen for leak testing to the engine (E) before starting the engine (E); and The second gas piping (GL2) connects the first gas piping (GL1) and the main gas piping (MGL).

18. The vessel as claimed in claim 9, wherein, The engine includes a low-pressure dual-fuel propulsion engine.

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