Combined LNG ventilation mast

Abstract

The combined LNG ventilation mast comprises a main structure pipe, a second operation overhaul platform is arranged on the outer wall of the circumference of the top of the main structure pipe, and a large cabin safety valve ventilation cap, a gas pipeline safety valve ventilation cap, a main engine generator purge valve ventilation cap and a main insulation space safety valve ventilation cap penetrate through the top of the second operation overhaul platform. The main structure pipe is of a hollow structure and serves as a large cabin safety valve vent pipe, and the bottom of the main structure pipe is fixed to a deck through welding. A secondary insulation safety valve ventilation cap and a first operation maintenance platform are designed in the middle of the main structure pipe. According to the combined LNG ventilation mast, combined centralized arrangement is achieved, purging ventilation high-point discharging is achieved through a main engine, a generator, a GCU, a GVT and the like, and safety is improved; a gas pipeline and an equipment high-pressure safety valve are discharged at a high point, so that the safety is improved; according to the discharge characteristics of the secondary insulation safety valve, the secondary insulation safety valve is arranged in the middle of the ventilation mast and far away from the main deck, and dangerousness is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of ventilated mast technology, specifically a combined LNG ventilated mast. Background Technology

[0002] A liquefied natural gas (LNG) carrier is a ship specifically designed to transport liquefied natural gas. It is a "super-refrigerated truck at sea" that carries LNG at a temperature of -163 degrees Celsius and is one of the most difficult ship types to build in the world.

[0003] Based on their structural form, liquefied natural gas (LNG) tanks can be divided into independent tank type and membrane type. The former involves placing cylindrical, can-shaped, or spherical tanks inside the ship; the latter uses a double-hull structure, with the inner hull serving as the supporting shell for the LNG tanks. Compared to the independent type, the membrane type offers advantages such as higher volumetric utilization and lighter structural weight. Therefore, newly built LNG carriers, especially large ones, mostly adopt membrane structures. LNG carriers have complex equipment, high technical requirements, and are expensive to build.

[0004] The design of the LNG main compartment venting mast in existing technology applications has significant limitations. It only includes two core paths: the main compartment safety valve venting and the main insulation layer space safety valve venting. However, the purging venting of critical equipment such as the main engine, generator, GCU (Gas Combustion Unit), and GVT (Gas Valve Assembly) must be directed to the top of the chimney or other safe areas, while the safety valve venting of the secondary insulation space is directly released to the main deck. This decentralized design results in poor system integrity: the various venting paths lack coordinated planning, are scattered, and operate independently. This increases the complexity of pipeline laying and is not conducive to forming a unified venting flow and pressure control system.

[0005] More importantly, there are safety concerns: the direct discharge of vented gas from the secondary insulation space to the main deck can easily lead to the local accumulation of flammable gases due to insufficient ventilation, especially in rocking or enclosed environments, posing a risk of explosion upon contact with an ignition source. The dispersed venting endpoints (such as the top of the chimney and the main deck) increase the number of leak detection points, making real-time monitoring more difficult, and the lack of coordinated management of venting parameters across different paths may lead to problems such as localized overpressure and gas backflow. Furthermore, this design falls short of the International Maritime Organization (IMO) requirements for centralized management and reduced risk points in LNG ship venting systems, increasing the complexity of daily maintenance and reducing the efficiency of rapid response in emergency situations. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0007] 1. Technical problems to be solved:

[0008] To address the issues raised in the original LNG main cargo hold venting mast design, which consisted of only two parts—the main cargo hold safety valve venting mast and the main insulation layer space safety valve venting mast—each venting the main engine, generator, GCU, and GVT to the top of the chimney or other safe locations, while the secondary insulation layer space safety valve venting mast directly released the air into the main deck, resulting in poor overall integrity and safety, this invention was proposed.

[0009] Therefore, the purpose of this invention is to provide a combined LNG venting mast, which is centrally arranged to allow for high-point venting of the main unit, generator, GCU, and GVT, thereby increasing safety; high-pressure safety valves for gas pipelines and equipment are also used for high-point venting, further enhancing safety; and based on the venting characteristics of the secondary insulation safety valves, they are positioned in the middle of the venting mast, away from the main deck, greatly reducing the risk.

[0010] 2. Technical Solution:

[0011] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0012] A combined LNG venting mast includes a main structural pipe. A second operation and maintenance platform is provided on the top circumferential outer wall of the main structural pipe. A vent cap for the main compartment safety valve, a vent cap for the gas pipeline safety valve, a vent cap for the main generator purge valve, and a vent cap for the main insulation space safety valve are passed through the top of the second operation and maintenance platform. A vent cap for the secondary insulation safety valve and a first operation and maintenance platform are also provided in the middle of the main structural pipe.

[0013] In a preferred embodiment of the combined LNG ventilated mast of the present invention, the main structural tube is a hollow structure and is a splicable metal tube.

[0014] In a preferred embodiment of the combined LNG ventilated mast of the present invention, the bottom of the main structural tube is welded to the main deck, and the outer circumferential wall of the base is provided with reinforcing ribs.

[0015] As a preferred embodiment of the combined LNG ventilated mast of the present invention, the outer circumferential wall of the main structural pipe is welded with a bracket, and there are multiple brackets, which are used to fix other pipelines on the main structural pipe (1).

[0016] As a preferred embodiment of the combined LNG ventilated mast of the present invention, a ladder is welded to the side wall of the main structural pipe and a ladder is welded to the top of the main structural pipe.

[0017] As a preferred embodiment of the combined LNG venting mast of the present invention, a second ladder is welded to the bottom of the second operation and maintenance platform, and the bottom of the second ladder is connected to the first operation and maintenance platform.

[0018] 3. Beneficial effects:

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This type of modular LNG venting mast, through the combined use of components and centralized arrangement, allows for high-point venting of the main unit, generator, GCU, and GVT, increasing safety; high-point venting of gas pipelines and equipment high-pressure safety valves also increases safety; and based on the venting characteristics of the secondary insulation safety valve, it is positioned in the middle of the venting mast, away from the main deck, greatly reducing the risk. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0022] Figure 1 This is a three-dimensional structural diagram of a combined LNG ventilated mast according to the present invention;

[0023] Figure 2 This is an overall schematic diagram of a combined LNG ventilated mast according to the present invention;

[0024] Figure 3 This is a schematic diagram of the main side of a combined LNG ventilated mast according to the present invention;

[0025] Figure 4 This is a schematic diagram of the secondary side of a combined LNG ventilated mast according to the present invention.

[0026] The following are the labels in the diagram: 1. Main structural pipe; 2. Base; 3. Support; 4. Ladder 1; 5. First operation and maintenance platform; 6. Ladder 2; 7. Second operation and maintenance platform; 8. Main compartment safety valve vent cap; 9. Gas pipeline safety valve vent cap; 10. Main generator purge valve vent cap; 11. Main insulation space safety valve vent cap; 12. Secondary insulation safety valve vent cap. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] This invention is described in detail with reference to the schematic diagrams. When describing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0029] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0030] The term "connection method" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0032] This invention provides a schematic diagram of the overall structure of one embodiment of a combined LNG venting mast, comprising:

[0033] Please see Figures 1-4 This embodiment of a combined LNG venting mast includes a main structural pipe 1. A second operation and maintenance platform 7 is provided on the top circumferential outer wall of the main structural pipe 1. A large compartment safety valve vent cap 8, a gas pipeline safety valve vent cap 9, a main generator purge valve vent cap 10, and a main insulation space safety valve vent cap 11 pass through the top of the second operation and maintenance platform 7. A secondary insulation safety valve vent cap 12 and a first operation and maintenance platform 5 are provided in the middle of the main structural pipe 1. The main structural pipe 1 is formed into a hollow tubular structure by splicable metal pipes to serve as the large compartment safety valve vent pipe.

[0034] To enhance the support effect, a base 2 is provided at the bottom of the main structural tube 1. The base 2 is welded to the deck, and reinforcing ribs are further provided on the outer circumference of the base 2.

[0035] Meanwhile, in order to increase the strength of the main structural pipe 1, a bracket 3 is welded to the outer circumference of the bracket 1. There are multiple brackets 3. In addition, the brackets 3 can also facilitate the fixing of other pipes to the main structural pipe 1.

[0036] To facilitate observation and maintenance of the intermediate vent cap, a second ladder 4 is welded to the bottom of the first operation and maintenance platform 5, and the bottom of the second ladder 4 is connected to the deck.

[0037] To facilitate observation and maintenance of the top ventilation cap, a second ladder 6 is welded to the bottom of the second operation and maintenance platform 7, and the bottom of the second ladder 6 is connected to the first operation and maintenance platform 5.

[0038] Combination Figures 1-4 The specific effects of this embodiment of a combined LNG permeable mast are as follows:

[0039] High-point venting of the main engine, generator, GCU, and GVT increases safety; high-point venting of gas pipelines and equipment high-pressure safety valves increases safety; based on the venting characteristics of the secondary insulation safety valve, it is arranged in the middle of the venting mast, away from the main deck, which greatly reduces the risk.

[0040] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A combined LNG ventilated mast, characterized in that, The system includes a main structural pipe (1), and a second operation and maintenance platform (7) is provided on the top circumferential outer wall of the main structural pipe (1). The top of the second operation and maintenance platform (7) is pierced by a large cabin safety valve vent cap (8), a gas pipeline safety valve vent cap (9), a main generator purge valve vent cap (10), and a main insulation space safety valve vent cap (11). A secondary insulation safety valve vent cap (12) and a first operation and maintenance platform (5) are provided in the middle of the main structural pipe (1).

2. The combined LNG ventilated mast according to claim 1, characterized in that, The main structural tube (1) is a hollow structure and is a metal tube that can be spliced ​​together. It also serves as a vent pipe for the safety valve of the large cabin.

3. The combined LNG ventilated mast according to claim 2, characterized in that, The bottom base (2) of the main structural tube (1) is fixed to the deck by welding, and the outer circumferential wall of the base (2) is provided with reinforcing ribs.

4. The combined LNG ventilated mast according to claim 3, characterized in that, The outer circumferential wall of the main structural pipe (1) is welded with a bracket (3), and there are multiple brackets (3). The brackets (3) are used to fix other pipes on the main structural pipe (1).

5. The combined LNG ventilated mast according to claim 4, characterized in that, A ladder (4) is welded to the side wall of the main structural pipe (1), and a ladder (6) is welded to the top of the main structural pipe (1).

6. The combined LNG ventilated mast according to claim 5, characterized in that, The bottom of the second operation and maintenance platform (7) is welded with a second ladder (6), and the bottom of the second ladder (6) is connected to the first operation and maintenance platform (5).

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