Gas carrier sea water spray system

Abstract

This utility model relates to the field of gas carriers and provides a seawater spraying system for gas carriers. It includes a deck spray pump, the input end of which is connected to a seawater main pipe, and the output end of which is connected to a spray main pipe. The spray main pipe connects to multiple spray branches, and high-pressure compressed gas pipelines and low-pressure compressed gas pipelines are connected to the spray main pipe. Seawater is used to spray the entire deck and critical equipment compartments, achieving functions such as cooling and fire suppression. A vent valve is installed to promptly drain seawater from the pipelines. Freshwater pipelines, in conjunction with high-pressure compressed air pipelines, are used to dilute and flush the seawater in the pipelines, preventing nozzle clogging and corrosion from residual seawater. Low-pressure compressed air, in conjunction with a timer, intermittently blows through the pipelines and nozzles, keeping the pipelines dry and preventing nozzle clogging, ensuring the entire seawater spraying system is in optimal condition.

Description

Technical Field

[0001] This utility model relates to the field of gas transport ships, specifically to a seawater spraying system for gas transport ships. Background Technology

[0002] Gas transport vessels are typically used to transport flammable, explosive, and toxic gases such as LNG, ethane, methanol, and ammonia. They pose a significant risk, as deflagration can easily occur during gas injection or when gas pipelines leak, severely threatening the safety of the crew and the entire vessel. According to the IGC Code, ships carrying flammable or toxic goods, or both, must be equipped with water mist systems for cooling, fire prevention, and crew protection.

[0003] Existing ships are generally equipped with seawater sprinkler systems, utilizing the inexhaustible seawater as fire-fighting water. These systems cover critical pipelines and equipment across the entire deck, including exposed cargo tanks, gas chambers, and exposed interfaces facing cargo areas. Seawater sprinkler systems have become essential facilities for protecting crew and ship safety on gas transport vessels. However, due to the corrosive nature of seawater and the small nozzle outlets of the sprinkler system, nozzles are prone to rust and blockage, potentially leading to pipe perforations and breaks. Seawater sprinkler systems are a key focus during Port State Control (PSC) inspections. Failure to pass inspection due to nozzle blockage can result in penalties for ship owners, including ship impoundment, severely impacting delivery schedules and owner profits. Nozzle blockage requires manual cleaning or replacement; replacing pipelines further wastes manpower and resources. Therefore, it is crucial to promptly remove seawater from the pipelines and keep the nozzles clean to prevent corrosion and blockage. Summary of the Invention

[0004] In order to meet the IGC regulations and achieve spraying of the deck and key parts of gas carriers, and to avoid pipe corrosion and nozzle blockage caused by seawater spraying, this utility model provides a seawater spraying system for gas carriers with timed spraying.

[0005] The technical solution adopted by this utility model is as follows:

[0006] A seawater sprinkler system for a gas transport ship includes a deck sprinkler pump. The input end of the deck sprinkler pump is connected to a main seawater pipe, and the output end of the deck sprinkler pump is connected to a main sprinkler pipe. The main sprinkler pipe connects to multiple sprinkler branches, which cover the area of ​​the gas transport ship that needs to be sprinkled. Each sprinkler branch is equipped with multiple evenly distributed nozzles. The output end of the deck sprinkler pump and each of the sprinkler branches are equipped with remote control valves. The deck sprinkler pump and the remote control valves are controlled by the gas transport ship's control system. A freshwater input pipe is connected in parallel to the output end of the deck sprinkler pump. A control valve is installed on the freshwater input pipe. A high-pressure compressed gas pipeline and a low-pressure compressed gas pipeline are connected to the main sprinkler pipe. An electromagnetic check valve is installed on each compressed gas pipeline, and a timer valve is installed on the low-pressure compressed gas pipeline. Both the electromagnetic check valve and the timer valve are controlled by the gas transport ship's control system.

[0007] Furthermore, a vent valve is installed at the lowest point of the main spray pipe.

[0008] Furthermore, the spray branch corresponding to the gas tank area of ​​the liquid cargo tank is connected to a fire sprinkler input, which is located in the thrust tank on the bow side. The fire sprinkler input includes an emergency fire pump, which is connected to the seawater main pipe on the bow. The output end of the emergency fire pump is connected to a remote control valve and a check valve. The emergency fire pump is connected to the spray branch through a fire pipe, and a vent valve is installed at the bottom of the fire pipe.

[0009] Furthermore, the output end of the deck sprinkler pump is connected in parallel to the fire-fighting pipe inside the engine room, and a control valve is installed on the fire-fighting pipe.

[0010] Furthermore, the control system includes a main control panel, a remote control panel connected to the main control panel, and a pump starter box. The main control panel is installed in the cockpit, and the pump starter box is located in the engine room. The main control panel or the remote control panel controls various remote control valves, electromagnetic check valves, control valves, and timer valves through the main control panel. The main control panel controls the deck spray pump through the pump starter box.

[0011] Furthermore, the high-pressure compressed gas pipeline has a pressure of 0.7 MPa, and the low-pressure compressed gas pipeline has a pressure of 0.2 MPa.

[0012] Furthermore, the timing valve is activated for 2 minutes every 3 hours.

[0013] The beneficial effects of this utility model after adopting the above technical solution are as follows: Seawater is used to spray the entire ship deck and key equipment compartments, achieving functions such as cooling and fire fighting. By setting up a vent valve, seawater in the pipeline is discharged in a timely manner. A freshwater pipeline, in conjunction with a high-pressure compressed air pipeline, is used to dilute and flush the seawater in the pipeline, preventing nozzle blockage and corrosion from residual seawater. Low-pressure compressed air, in conjunction with a timer, intermittently blows through the pipeline and nozzles, keeping the pipeline dry and preventing nozzle blockage, thus ensuring the entire seawater spray system is in optimal condition. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present invention.

[0015] In the diagram: 1. Deck sprinkler pump; 2. Seawater main pipe; 3. Remote control valve; 4. Sprinkler main pipe; 5. Sprinkler branch pipe; 6. Remote control valve; 7. Sprinkler head; 8. Drain valve; 9. Emergency fire pump; 10. Bow seawater main pipe; 11. Fire hose; 12. Drain valve; 13. Freshwater inlet pipe; 14. Engine room fire hose; 15. High-pressure compressed gas pipeline; 16. Low-pressure compressed gas pipeline; 17. Electromagnetic check valve; 18. Timer valve; 19. Main control panel; 20. Remote control panel; 21. Pump starter box. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0017] As shown in the figure, the seawater sprinkler system of the gas carrier mainly includes a deck sprinkler pump 1, which draws seawater from the main seawater pipe 2 and sends it into the main sprinkler pipe 4 under the control of a remote control valve 3. The main sprinkler pipe 4 is connected to multiple sprinkler branches 5, each equipped with a remote control valve 6. The sprinkler branches 5 cover the pipes on the deck of the gas carrier, critical equipment on the deck, exposed cargo tank gas chambers, and exposed surfaces facing the cargo area. Each sprinkler branch 5 is equipped with multiple sprinkler heads 7, the spacing between which is related to the spray area. The spray ranges of adjacent sprinkler heads 7 overlap to ensure full coverage. A vent valve 8 is installed at the lowest point of the main sprinkler pipe 4 to discharge any remaining seawater after spraying.

[0018] The spray branch corresponding to the gas tank area of ​​the liquid cargo tank is connected to the fire sprinkler input. The fire sprinkler input is located in the thrust tank on the bow side. The fire sprinkler input includes an emergency fire pump 9, which is connected to the seawater main pipe 10 on the bow. The output end of the emergency fire pump 9 is connected to a remote control valve and a check valve. The emergency fire pump 9 is connected to the spray branch through the fire pipe 11. A vent valve 12 is installed at the bottom of the fire pipe 11.

[0019] The output of the deck sprinkler pump is connected in parallel to a freshwater inlet pipe 13 and an engine room fire hose 14. Control valves are installed on both the freshwater inlet pipe 13 and the engine room fire hose 14 to supplement the sprinkler water supply. The freshwater inlet pipe is mainly used for cleaning pipes and nozzles, as well as cleaning equipment rinsed with seawater, reducing seawater corrosion. A high-pressure compressed gas pipe 15 and a low-pressure compressed gas pipe 16 are connected to the main sprinkler pipe 4. Each compressed gas pipe is equipped with an electromagnetic check valve 17. The high-pressure compressed gas pressure is 0.7 MPa, and the low-pressure compressed gas pressure is 0.2 MPa. Both 0.7 MPa and 0.2 MPa compressed air are commonly used on ships, so no additional pressure reducing valves are needed. A timer valve 18 is installed on the low-pressure compressed gas pipe 16, which opens for 2 minutes every 3 hours. After seawater spraying, high-pressure gas is introduced through the freshwater inlet pipe 13 in conjunction with the high-pressure compressed gas pipe 15 to flush and blow away the seawater in the main spray pipe and spray branch pipes, ensuring the pipes are dry and preventing nozzle blockage. After high-pressure air purging is completed, intermittent low-pressure compressed gas purging is used to keep the pipeline dry and prevent blockage.

[0020] The deck sprinkler pump 1, remote control valve 3, timer valve 18, electromagnetic check valve 17, and other components are controlled by the gas carrier's control system. The control system includes a main control panel 19, a remote control panel 20 connected to the main control panel 19, and a pump starter box 21. The main control panel 19 is installed in the bridge, the remote control panel 20 is installed in an easily accessible location inside the cabin, and the pump starter box 21 is located in the engine room. The main control panel 19 or the remote control panel 20 remotely controls each control component through the main control panel 19, and the main control panel 19 controls the start and stop of the deck sprinkler pump 1 through the pump starter box 21.

Claims

1. A seawater sprinkler system for a gas transport ship, comprising a deck sprinkler pump, an input end of which is connected to a main seawater pipe, an output end of which is connected to a main sprinkler pipe, the main sprinkler pipe connecting to multiple sprinkler branches covering the area of ​​the gas transport ship to be sprinkled, each sprinkler branch being equipped with multiple evenly distributed nozzles, and a remote control valve being installed at the output end of the deck sprinkler pump and on each sprinkler branch, the deck sprinkler pump and the remote control valves being controlled by the gas transport ship's control system; characterized in that... The output end of the deck spray pump is connected in parallel to a fresh water input pipe, which is equipped with a control valve. The spray main is connected to a high-pressure compressed gas pipeline and a low-pressure compressed gas pipeline. Each compressed gas pipeline is equipped with an electromagnetic shut-off check valve, and the low-pressure compressed gas pipeline is equipped with a timer valve. The electromagnetic shut-off check valve and the timer valve are both controlled by the gas transport ship's control system.

2. The seawater spraying system for gas transport ships according to claim 1, characterized in that, A vent valve is installed at the lowest point of the main spray pipe.

3. The seawater spraying system for gas transport ships according to claim 1, characterized in that, The spray branch corresponding to the gas tank area of ​​the liquid cargo tank is connected to a fire sprinkler input. The fire sprinkler input is located in the thrust tank on the bow side. The fire sprinkler input includes an emergency fire pump, which is connected to the seawater main pipe on the bow. The output end of the emergency fire pump is connected to a remote control valve and a check valve. The emergency fire pump is connected to the spray branch through a fire pipe, and a vent valve is installed at the bottom of the fire pipe.

4. The seawater spraying system for gas transport ships according to claim 1, characterized in that, The output end of the deck sprinkler pump is connected in parallel to the fire-fighting pipe inside the engine room, and a control valve is installed on the fire-fighting pipe.

5. The seawater spraying system for gas transport ships according to claim 1, characterized in that, The control system includes a main control panel, a remote control panel connected to the main control panel, and a pump starter box. The main control panel is installed in the cockpit, and the pump starter box is located in the engine room. The main control panel or the remote control panel controls various remote control valves, electromagnetic check valves, control valves, and timer valves through the main control panel. The main control panel controls the deck spray pump through the pump starter box.

6. The seawater spraying system for gas transport ships according to claim 1, characterized in that, The high-pressure compressed gas pipeline has a pressure of 0.7 MPa, and the low-pressure compressed gas pipeline has a pressure of 0.2 MPa.

7. The seawater spraying system for gas transport ships according to claim 1, characterized in that, The timer valve is set to open for 2 minutes every 3 hours.

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