Ventilation and overflow method for oil tank in engine room area and ship

Abstract

The invention provides a ventilation overflow method for oil tanks in a cabin area. The ventilation overflow method comprises the following steps that the number of ventilation pipes of all the oil tanks is determined; after the number of each oil tank vent pipe is determined, the pipe diameter of the oil tank vent pipe is determined according to the pipe diameter of the injection pipe; ventilating pipes with corresponding pipe diameters are led to a chimney trunk on a deck 1 from the top in each oil tank; a horizontal ventilation header pipe is arranged at the position of a chimney trunk on a deck 1, and ventilation pipes of all oil tanks are converged into the ventilation header pipe; an overflow alarm box is arranged on the deck surface 1; a discharge pipe is led to the bottom of the pipe section with the maximum pipe diameter of the ventilation main pipe to be connected to an injection port of an overflow alarm box below; the alarm overflow pipe is connected to the overflow cabin; the overflow alarm box is provided with an alarm vent pipe, and one path extends to the chimney top. A safe and feasible ventilation and overflow scheme is provided for the oil tank in the engine room area, ventilation is concentrated, arrangement of ventilation pipelines is reduced, overflow pipelines are ingeniously arranged, the overflow response time is prolonged, and the safety of a ship is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of ship design technology, and specifically relates to a method for venting and overflowing oil tanks in the engine room area and a ship thereof. Background Technology

[0002] All liquid tanks on board require vent pipes to facilitate the injection and discharge of liquid media. Each oil tank has a vent pipe extending to the upper deck or top of the funnel, with each vent pipe having its own vent head. Due to the large number and wide distribution of oil tanks in the engine room, and the large diameter of most of the vent pipes, a large number of vent pipes need to be arranged during the design phase. The long path of each vent pipe increases the difficulty of engine room layout given the limited space. This venting arrangement also consumes a significant amount of pipe material and vent heads. The oil fumes escaping from the vent heads can also have some impact on the normal work and life of the crew.

[0003] For fuel tanks located in double-bottomed structures, such as deep fuel tanks, overflow pipes cannot be installed due to their low position. To prevent the tanks from overflowing, a high-level alarm device must be installed. After the alarm is triggered, the crew must respond promptly and close the injection valve. However, if the alarm device malfunctions or the crew fails to close the valve in time, there is a risk of fuel leaking from the vent. Summary of the Invention

[0004] To address the problems existing in the prior art, a method for venting and overflowing fuel tanks in the engine room area is proposed, comprising the following steps:

[0005] Determine the number of vent pipes for each oil tank;

[0006] Once the number of vent pipes for each oil tank is determined, the diameter of the oil tank vent pipe is determined based on the diameter of its injection pipe.

[0007] Vent pipes of appropriate diameter are run from the top of each oil tank to the chimney cofferdam on deck 1.

[0008] A horizontal venting manifold is installed at the chimney cofferdam on deck 1, and the venting manifolds of each oil tank are connected to the venting manifold.

[0009] An overflow alarm box is installed on deck 1, positioned below the main vent pipe; an injection port and a vent are installed on the top of the overflow alarm box, and an alarm overflow pipe and a float level switch are installed inside the overflow alarm box;

[0010] At the bottom of the section with the largest diameter of the vent main, a drain pipe is connected to the injection port of the overflow alarm box below. The diameter of the drain pipe is the same as that of the vent main. The alarm overflow pipe is connected to the overflow chamber.

[0011] The overflow alarm box is equipped with an alarm vent pipe. The diameter of the alarm vent pipe is the same as the maximum diameter of the main vent pipe, and it extends all the way to the top of the chimney.

[0012] Furthermore, determining the number of vent pipes in each oil tank includes:

[0013] The length and width of the oil tanks are both less than 7 meters, and each tank can be equipped with one vent pipe;

[0014] Oil tanks with a length or width of 7 meters or more must be equipped with 2 vent pipes per tank.

[0015] Furthermore, each fuel tank is equipped with two vent pipes, while the main and auxiliary engine day fuel tanks, venting tanks, and overflow tanks are each equipped with one vent pipe.

[0016] Furthermore, the overflow vent pipe of the overflow compartment is merged with the alarm vent pipe of the overflow alarm box on the upper part of the deck 1, and the overflow vent pipe and the alarm vent pipe have the same diameter.

[0017] Furthermore, the total cross-sectional area of ​​the vent pipe in each oil tank is at least 25% larger than the cross-sectional area of ​​its injection pipe.

[0018] Furthermore, the cross-sectional area at the maximum diameter of the vent manifold is at least 25% larger than the cross-sectional area of ​​the injection manifold.

[0019] Furthermore, when each vent pipe of each oil tank merges with the main vent pipe, a gooseneck bend is installed on the vent pipe above the main vent pipe, and the main vent pipe is connected at the top of the vent pipe.

[0020] Furthermore, the end of the alarm overflow pipe should be higher than the height of the float level switch.

[0021] Furthermore, a vent head with a fireproof mesh is installed at the end of the alarm vent pipe.

[0022] A vessel that employs the above-described method for venting and overflowing oil tanks in the engine room area.

[0023] The fuel tank venting and overflow method for the engine compartment area provided by this invention has the following advantages over the prior art:

[0024] This invention provides a safe and feasible ventilation and overflow solution for oil tanks in the engine room area. It features centralized ventilation, reduces the need for ventilation piping, and cleverly designs overflow piping to extend overflow response time, thereby greatly improving the safety of the ship. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the principle of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Reference Figure 1 This application proposes a method for venting and overflowing fuel tanks in the engine compartment area. Taking the fuel system as an example (the lubricating oil system is similar), the specific steps are as follows:

[0028] 1. Determine the number of vent pipes for each fuel tank. For fuel tanks with a length and width less than 7 meters, one vent pipe can be installed per tank; for fuel tanks with a length or width greater than or equal to 7 meters, two vent pipes are required per tank, or multiple vent pipes may be installed as needed. The spacing between vent pipes within the same tank should be reasonable. Two vent pipes are installed for each of fuel tanks 1-6, and one vent pipe is installed for each of the main and auxiliary engine day fuel tanks, venting tank, and overflow tank.

[0029] 2. After determining the number of vent pipes for each oil tank, determine the diameter of the vent pipes for the oil tank based on the diameter of the injection pipes. The total cross-sectional area of ​​the vent pipes for each oil tank should be at least 25% larger than the cross-sectional area of ​​the injection pipes.

[0030] 3. Draw vent pipes of the appropriate diameter from the top of each oil tank to the chimney cofferdam on deck 1.

[0031] 4. A horizontal venting manifold shall be installed at the chimney cofferdam on deck 1. The cross-sectional area of ​​the venting manifold at its maximum diameter shall be at least 25% larger than the cross-sectional area of ​​the injection manifold.

[0032] 5. Where each vent pipe of each oil tank merges with the main vent pipe, a gooseneck bend shall be installed on the vent pipe above the main vent pipe, and the main vent pipe shall be connected at the top of the vent pipe. Figure 1 As shown, this ensures that the oil in the vent pipe can flow to the vent main pipe, but the oil in the vent main pipe cannot flow back into the vent pipe.

[0033] 6. Install an overflow alarm box on deck 1, positioned below the main vent pipe; the top of the overflow alarm box is equipped with an inlet and a vent, and the box contains an alarm overflow pipe and a float level switch. The end of the alarm overflow pipe should be higher than the float level switch to ensure that the oil in the box first triggers the level switch and then overflows from the alarm overflow pipe.

[0034] 7. At the bottom of the section of the vent pipe with the largest diameter, connect a drain pipe to the inlet of the overflow alarm box below. The diameter of the drain pipe is the same as that of the vent pipe. Connect the alarm overflow pipe to the double-bottomed overflow chamber. In this way, the oil that overflows from the vent pipe to the vent pipe can be discharged into the overflow alarm box, triggering the level switch alarm again inside the overflow alarm box. After the oil in the overflow alarm box reaches a certain height, it overflows from the alarm overflow pipe into the overflow chamber.

[0035] 8. The overflow alarm box is equipped with a vent pipe with the same diameter as the maximum diameter of the main vent pipe, which extends all the way to the top of the chimney, and a vent head with a fireproof mesh is installed at the end of the pipe.

[0036] 9. The overflow vent pipe of the overflow compartment is merged with the vent pipe of the overflow alarm box on the upper part of deck 1, and the pipe diameter is the same.

[0037] Using the vessel described in this application, each vent pipe merges into the main vent pipe, eliminating the need for separate upward extensions and thus saving on piping and vent head materials. Regardless of the number of oil tanks, only one vent head is installed, located at the top of the funnel, preventing pollution of the upper deck area and having no impact on the crew's work and life. In addition to high-level alarms, each oil tank in the double bottom is equipped with an overflow alarm box in the main vent pipe, providing alarm functionality. Simultaneously, oil can overflow into the overflow tank, providing triple safety measures to prevent oil from leaking from the vent head.

[0038] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the specification are within the scope of the present invention.

Claims

1. A method for venting and overflowing fuel tanks in the engine room area, characterized in that, Includes the following steps: Determine the number of vent pipes for each oil tank; Once the number of vent pipes for each oil tank is determined, the diameter of the oil tank vent pipe is determined based on the diameter of its injection pipe. Vent pipes of appropriate diameter are run from the top of each oil tank to the chimney cofferdam on deck 1. A horizontal venting manifold is installed at the chimney cofferdam on deck 1, and the venting manifolds of each oil tank are connected to the venting manifold. An overflow alarm box is installed on deck 1, positioned below the main vent pipe; an injection port and a vent are installed on the top of the overflow alarm box, and an alarm overflow pipe and a float level switch are installed inside the overflow alarm box; At the bottom of the section with the largest diameter of the vent main, a drain pipe is connected to the injection port of the overflow alarm box below. The diameter of the drain pipe is the same as that of the vent main. The alarm overflow pipe is connected to the overflow chamber. The overflow alarm box is equipped with an alarm vent pipe. The diameter of the alarm vent pipe is the same as the maximum diameter of the main vent pipe, and it extends all the way to the top of the chimney.

2. The method according to claim 1, characterized in that, Determining the number of vent pipes for each oil tank includes: The length and width of the oil tanks are both less than 7 meters, and each tank can be equipped with one vent pipe; Oil tanks with a length or width of 7 meters or more must be equipped with 2 vent pipes per tank.

3. The method according to claim 2, characterized in that: Each fuel tank is equipped with two vent pipes, while the main and auxiliary engine day fuel tanks, venting tanks, and overflow tanks are each equipped with one vent pipe.

4. The method according to claim 3, characterized in that: The overflow vent pipe of the overflow compartment is merged with the alarm vent pipe of the overflow alarm box on the upper part of deck 1. The overflow vent pipe and the alarm vent pipe have the same diameter.

5. The method according to claim 1, characterized in that: The total cross-sectional area of ​​the vent pipes in each oil tank shall be at least 25% larger than the cross-sectional area of ​​its injection pipes.

6. The method according to claim 1, characterized in that: The cross-sectional area at the maximum diameter of the vent manifold is at least 25% larger than the cross-sectional area of ​​the injection manifold.

7. The method according to claim 1, characterized in that: When each vent pipe of each oil tank merges with the main vent pipe, a gooseneck bend is installed on the vent pipe above the main vent pipe, and the main vent pipe is connected at the top of the vent pipe.

8. The method according to claim 1, characterized in that: The end of the alarm overflow pipe should be higher than the height of the float level switch.

9. The method according to claim 1, characterized in that: A vent head with a fireproof mesh is installed at the end of the alarm vent pipe.

10. A ship, characterized in that: The vessel employs the oil tank venting and overflow method for the engine room area as described in any one of claims 1-9.

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