Divided escape passage arrangement method for dual-fuel VLCC fuel gas equipment room based on C-type LNG storage tank

Abstract

The invention discloses a dual-fuel VLCC fuel gas equipment room zoning escape channel arrangement method based on a C-type LNG storage tank, and belongs to the technical field of ship design. In consideration of the danger of LNG fuel, at least two escape channels are designed in each working area, more choices are provided for personnel evacuation paths divided in a gas equipment room, and the life safety of personnel is guaranteed to the maximum extent. The inclined ladder steps on the traffic platform and the escape path are made of fireproof GRP grating materials, so that combustible liquid is prevented from gathering on the platform or the inclined ladder, and the situation that the surface temperature of the platform and the surface temperature of the steps are too high when a fire occurs, and personnel passing is affected is avoided. In addition, the GRP grating has the advantage of being good in anti-corrosion performance, and later maintenance is facilitated.

Description

Technical Field

[0001] The present invention relates to a method for arranging escape passages between gas equipment sections of a dual-fuel VLCC based on a C-type LNG storage tank, and belongs to the technical field of ship design. Background Art

[0002] C-type LNG storage tanks are C-shaped, achieved by bending or splicing cylindrical containers. They typically consist of a main cylindrical portion with curved ends. Compared to traditional cylindrical tanks, they offer advantages in terms of space utilization and structural stability. Their shape allows them to better adapt to a vessel's spatial layout, improving space utilization. Furthermore, their relatively compact structure contributes to vessel stability and navigational safety. During sea voyages, C-type tanks can safely store large quantities of LNG, providing clean fuel for ships. With the IMO's increasing requirements for energy conservation and emission reduction, the use of LNG fuel is becoming increasingly widespread on large vessels. However, as a flammable and explosive gas, the safety of LNG is a matter of close attention.

[0003] The fuel room on a VLCC (Very Large Crude Carrier) is a specialized compartment used for storing and handling fuel-related equipment. It incorporates a complex system for fuel storage, transportation, purification, and pre-combustion treatment. A maintenance platform is installed above the C-type LNG tank for operating valves on the pipelines and maintaining equipment within the tank. However, the risk of LNG leakage during operation requires a safe and reliable escape route to facilitate smooth evacuation to a safe area.

[0004] Regulations require an escape route to the upper deck from the top of the LNG tank and the gas equipment room. This is typically achieved via an inclined ladder from the tank roof platform to the top of the gas equipment room. From there, an inclined ladder on the stern side leads to the upper deck. This is the industry's standard approach for arranging escape routes within LNG fuel tanks. Based on existing escape route layout plans, the escape route must pass through the gas equipment room. However, the gas equipment room also houses numerous pipes, valves, and other equipment, creating the risk of dangerous gas leaks. If a fire or other hazardous situation develops in the gas equipment room, the escape route on the tank roof will be cut off, posing the risk of entrapment. Summary of the Invention

[0005] To address the problems and shortcomings of existing designs, the present invention provides a second escape route on each LNG tank roof platform, serving as a secondary escape route. If the primary escape route to the gas equipment room is blocked, evacuation to the upper deck is possible via the secondary escape route. A vertical ladder is also installed on the bow side of the gas equipment room, serving as a secondary escape route at the top of the room. This dual escape route provides multiple escape paths, maximizing personnel safety.

[0006] The technical means adopted by the present invention are as follows: a method for arranging escape routes in the gas equipment room of a dual-fuel VLCC based on a C-type LNG storage tank. The LNG storage tank is installed on the main deck and has a total of four work areas: work area one is located on the operating platform installed on the top of the LNG storage tank, work area two is located at the hanging hole on the starboard side of the top of the gas equipment room, work area three is located at the ventilation duct on the stern side of the top of the gas equipment room, and work area four is located inside the gas equipment room;

[0007] One side of the first operating platform in the working area 1 is connected to the second transportation platform on the side of the pipe support tower. The second transportation platform is connected to the top of the first inclined ladder, and the bottom of the second inclined ladder is connected to the fourth transportation platform; the fourth transportation platform is connected to the top of the third inclined ladder, and the bottom of the third inclined ladder is connected to the fifth transportation platform; the fifth transportation platform is connected to the top of the fourth inclined ladder, and the bottom of the fourth inclined ladder is connected to the sixth transportation platform; the sixth transportation platform is connected to the top of the fifth inclined ladder, and the bottom of the fifth inclined ladder is connected to the seventh transportation platform; the seventh transportation platform is connected to the top of the sixth inclined ladder, and the bottom of the sixth inclined ladder is connected to the main deck;

[0008] The fourth traffic platform is arranged above the gas equipment room through a bracket, the fifth traffic platform is arranged on the top surface of the gas equipment room, the sixth traffic platform is arranged outside the gas equipment room, and the seventh traffic platform is arranged on the bottom surface of the gas equipment room;

[0009] The other side of the first operating platform in the work area 1 is connected to the third traffic platform, the third traffic platform is connected to the top of the seventh inclined ladder, the bottom end of the seventh inclined ladder is connected to the escape tower, the escape tower is provided with a first vertical ladder and a second vertical ladder, and the bottom end of the second vertical ladder is provided on the main deck;

[0010] The first escape route of work area 1 is: first operating platform → second traffic platform → first inclined ladder → second inclined ladder → fourth traffic platform → third inclined ladder → fifth traffic platform → fourth inclined ladder → sixth traffic platform → fifth inclined ladder → seventh traffic platform → sixth inclined ladder → main deck;

[0011] The second escape route of work area 1 is: first operating platform → third traffic platform → seventh inclined ladder → first straight ladder → second straight ladder → main deck;

[0012] Work Area 2 is connected to the bottom end of the eighth inclined ladder, the top of which is connected to one end of the eighth transportation platform; the other end of the eighth transportation platform is connected to the top end of the ninth inclined ladder, the bottom end of which is located on the ninth transportation platform; the ninth transportation platform is connected to the top end of the third vertical ladder, the bottom end of which is located on the bottom surface of the gas equipment room; the bottom surface of the gas equipment room is connected to the top end of the tenth inclined ladder, the bottom end of which is located on the main deck;

[0013] One side of the eighth transportation platform is connected to the top of the ninth inclined ladder, and the bottom end of the ninth inclined ladder is connected to the fourth transportation platform;

[0014] The first escape route of work area 2 is: work area 2 → eighth inclined ladder → eighth traffic platform → ninth inclined ladder → fourth traffic platform → third inclined ladder → fifth traffic platform → fourth inclined ladder → sixth traffic platform → fifth inclined ladder → seventh traffic platform → sixth inclined ladder → main deck;

[0015] The second escape route of work area 2 is: work area 2 → eighth inclined ladder → eighth traffic platform → ninth inclined ladder → ninth traffic platform → third vertical ladder → tenth inclined ladder → main deck;

[0016] Work area three is connected to the bottom of the third inclined ladder, the top of which is connected to the fourth transportation platform; the fourth transportation platform is connected to the top of the ninth inclined ladder, the bottom of which is connected to the eighth transportation platform;

[0017] The working area 3 is also connected to the fifth transportation platform;

[0018] The first escape route of work area three is: work area three → fifth traffic platform → fourth inclined ladder → sixth traffic platform → fifth inclined ladder → seventh traffic platform → sixth inclined ladder → main deck;

[0019] The second escape route of work area three is: work area three → third inclined ladder → fourth traffic platform → ninth inclined ladder → ninth traffic platform → third vertical ladder → tenth inclined ladder → main deck;

[0020] Work Area 4 is provided with a front door and a rear door. The bottom surface of the gas equipment room at the front door is connected to the top of the tenth inclined ladder, the bottom of which is located on the main deck. The tenth traffic platform is provided at the rear door. The tenth traffic platform is connected to the top of the eleventh inclined ladder, the bottom of which is located on the main deck.

[0021] The first escape route of work area 4 is: rear door of work area 4 → 10th traffic platform → 11th inclined ladder → main deck;

[0022] The second escape route of work area four is: front door of work area four → tenth inclined ladder → main deck.

[0023] Compared to existing technologies, this invention offers the following advantages: Taking into account the hazards of LNG fuel, at least two escape routes are designed into each work area, providing more options for evacuation routes between gas equipment rooms and maximizing personnel safety. Fireproof GRP grating is used on both the access platform and the inclined stair steps on the escape route. This not only prevents the accumulation of flammable liquids on the platform or inclined stair, but also prevents excessive surface temperatures on the platform and steps in the event of a fire, potentially impacting access. Furthermore, GRP grating is corrosion-resistant, facilitating subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 This is the general arrangement diagram of the gas equipment room of a dual-fuel VLCC based on a C-type LNG storage tank.

[0026] Figure 2 Schematic diagram of the operating platform on top of the LNG storage tank and the top of the pipe support tower.

[0027] Figure 3 This is a schematic diagram of the top surface of the gas equipment room.

[0028] Figure 4 This is a schematic diagram of the bottom surface of the gas equipment room.

[0029] In the figure: 1. Pipe support tower;

[0030] 2-1, first inclined ladder, 2-2, second inclined ladder, 2-3, third inclined ladder, 2-4, fourth inclined ladder, 2-5, fifth inclined ladder, 2-6, sixth inclined ladder, 2-7, seventh inclined ladder, 2-8, eighth inclined ladder, 2-9, ninth inclined ladder, 2-10, tenth inclined ladder, 2-11, eleventh inclined ladder;

[0031] 3-1, first operating platform, 3-2, second transportation platform, 3-3, third transportation platform, 3-4, fourth transportation platform, 3-5, fifth transportation platform, 3-6, sixth transportation platform, 3-7, seventh transportation platform, 3-8, eighth transportation platform, 3-9, ninth transportation platform, 3-10, tenth transportation platform;

[0032] 4. Escape tower;

[0033] 5-1, the first straight ladder, 5-2, the second straight ladder, 5-3, the third straight ladder. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0038] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0039] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "above" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0040] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0041] Figures 1 to 4 A dual-fuel VLCC gas equipment room based on a C-type LNG storage tank is shown. The LNG storage tank is set on the main deck and has a total of four work areas; work area one is located on the operating platform set on the top of the LNG storage tank, work area two is located at the hanging hole on the starboard side of the top of the gas equipment room, work area three is located at the ventilation duct on the stern side of the top of the gas equipment room, and work area four is located inside the gas equipment room.

[0042] One side of the first operating platform 3-1 in the working area one is connected to the second transportation platform 3-2 on one side of the pipe support tower 1, the second transportation platform 3-2 is connected to the top of the first inclined ladder 2-1, and the bottom end of the second inclined ladder 2-1 is connected to the fourth transportation platform 3-4; the fourth transportation platform 3-4 is connected to the top of the third inclined ladder 2-3, and the bottom end of the third inclined ladder 2-3 is connected to the fifth transportation platform 3-5; the fifth transportation platform 3-5 is connected to the top of the fourth inclined ladder 2-4, and the bottom end of the fourth inclined ladder 2-4 is connected to the sixth transportation platform 3-6; the sixth transportation platform 3-6 is connected to the top of the fifth inclined ladder 2-5, and the bottom end of the fifth inclined ladder 2-5 is connected to the seventh transportation platform 3-7; the seventh transportation platform 3-7 is connected to the top of the sixth inclined ladder 2-6, and the bottom end of the sixth inclined ladder 2-6 is connected to the main deck.

[0043] The other side of the first operating platform 3-1 in the working area 1 is connected to the third traffic platform 3-3, the third traffic platform 3-3 is connected to the top of the seventh inclined ladder 2-7, the bottom end of the seventh inclined ladder 2-7 is connected to the escape tower 1, and the first straight ladder 5-1 and the second straight ladder 5-2 are set on the escape tower 1, and the bottom end of the second straight ladder 5-2 is set on the main deck.

[0044] The fourth traffic platform 3-4 is set above the gas equipment room through a bracket, the fifth traffic platform 3-5 is set on the top surface of the gas equipment room, the sixth traffic platform 3-6 is set outside the gas equipment room, and the seventh traffic platform 3-7 is set on the bottom surface of the gas equipment room.

[0045] Work Area 2 connects to the bottom of the eighth inclined ladder 2-8, the top of which connects to one end of the eighth access platform 3-8. The other end of the eighth access platform 3-8 connects to the top of the ninth inclined ladder 2-9, the bottom of which is located on the ninth access platform 3-9. The ninth access platform 3-9 connects to the top of the third vertical ladder 5-3, the bottom of which is located on the floor of the gas equipment room. The floor of the gas equipment room connects to the top of the tenth inclined ladder 2-10, the bottom of which is located on the main deck. One side of the eighth access platform 3-8 connects to the top of the ninth inclined ladder 2-9, the bottom of which connects to the fourth access platform 3-4.

[0046] Work Area 3 connects to the bottom of the third inclined ladder 2-3, the top of which connects to the fourth transportation platform. The fourth transportation platform 3-4 connects to the top of the ninth inclined ladder 2-9, the bottom of which connects to the eighth transportation platform 3-8. Work Area 3 also connects to the fifth transportation platform 3-5.

[0047] The working area four is provided with a front door and a rear door. The bottom surface of the gas equipment room at the front door is connected to the top of the tenth inclined ladder 2-10, and the bottom end of the tenth inclined ladder 2-10 is set on the main deck; the tenth traffic platform 3-10 is set at the rear door, and the tenth traffic platform 3-10 is connected to the top of the eleventh inclined ladder 2-11, and the bottom end of the eleventh inclined ladder 2-11 is set on the main deck.

[0048] The gas equipment room's escape routes primarily include: 1. Pipe support tower; 2. Inclined ladder; 3. Operation / access platform; 4. Escape tower; and 5. Vertical ladder. Both the inclined ladder steps and access platform are clad in fire-resistant GRP grating. The gas equipment room's overhead piping is complex and high, making it difficult for personnel to directly cross. To connect the various overhead areas and facilitate pipeline maintenance, an operation / access platform was installed on the equipment room's roof.

[0049] According to the layout of the area, workers may be located in four areas. The escape routes for each area are described as follows:

[0050] Work Area 1: The maintenance platform located on top of the LNG tank is symmetrical on the port and starboard sides. Taking the port side as an example, the escape routes are as follows:

[0051] The first escape route of work area one is: first operating platform 3-1 → second traffic platform 3-2 → first inclined ladder 2-1 → second inclined ladder 2-2 → fourth traffic platform 3-4 → third inclined ladder 2-3 → fifth traffic platform 3-5 → fourth inclined ladder 2-4 → sixth traffic platform 3-6 → fifth inclined ladder 2-5 → seventh traffic platform 3-7 → sixth inclined ladder 2-6 → main deck.

[0052] The second escape route of the working area 1 is: the first operating platform 3-1 → the third traffic platform 3-3 → the seventh inclined ladder 2-7 → the first straight ladder 5-1 → the second straight ladder 5-2 → the main deck.

[0053] Work Area 2: Located on the starboard side of the top of the gas equipment room, near the hanging hole

[0054] The first escape route of work area 2 is: work area 2 → eighth inclined ladder 2-8 → eighth traffic platform 3-8 → ninth inclined ladder 2-9 → fourth traffic platform 3-4 → third inclined ladder 2-3 → fifth traffic platform 3-5 → fourth inclined ladder 2-4 → sixth traffic platform 3-6 → fifth inclined ladder 2-5 → seventh traffic platform 3-7 → sixth inclined ladder 2-6 → main deck;

[0055] The second escape route of work area 2 is: work area 2 → eighth inclined ladder 2-8 → eighth traffic platform 3-8 → ninth inclined ladder 2-9 → ninth traffic platform 3-9 → third vertical ladder 5-3 → tenth inclined ladder 2-10 → main deck;

[0056] Work Area 3: Located on the stern side of the top of the gas equipment room, near the ventilation duct

[0057] The first escape route of work area three is: work area three → fifth traffic platform 3-5 → fourth inclined ladder 2-4 → sixth traffic platform 3-6 → fifth inclined ladder 2-5 → seventh traffic platform 3-7 → sixth inclined ladder 2-6 → main deck;

[0058] The second escape route of work area three is: work area three → third inclined ladder 2-3 → fourth traffic platform 3-4 → ninth inclined ladder 2-9 → ninth traffic platform 3-9 → third vertical ladder 5-3 → tenth inclined ladder 2-10 → main deck;

[0059] Work area 4: located inside the gas equipment room

[0060] The first escape route of work area four is: rear door of work area four → 10th traffic platform 3-10 → 11th inclined ladder 2-11 → main deck.

[0061] The second escape route of work area four is: front door of work area four → tenth inclined ladder 2-10 → main deck.

[0062] The escape route arrangement scheme of the present invention provides no less than two escape routes for each work area divided in the gas equipment room. When a dangerous situation occurs on the first escape route, personnel can choose the second escape route to escape.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for arranging escape passages between gas equipment compartments of a dual-fuel VLCC based on a C-type LNG storage tank, characterized in that: The LNG storage tank is installed on the main deck, with four working areas in total; working area one is located at the operating platform on the top of the LNG storage tank, working area two is located at the hanging hole on the starboard side of the top of the gas equipment room, working area three is located at the ventilation duct on the stern side of the top of the gas equipment room, and working area four is located inside the gas equipment room; One side of the first operating platform (3-1) in the working area 1 is connected to the second transportation platform (3-2) on one side of the pipe support tower (1); the second transportation platform (3-2) is connected to the top of the first inclined ladder (2-1), and the bottom of the second inclined ladder (2-1) is connected to the fourth transportation platform (3-4); the fourth transportation platform (3-4) is connected to the top of the third inclined ladder (2-3), and the bottom of the third inclined ladder (2-3) is connected to the fifth transportation platform (3-5); the fifth transportation platform (3-5) is connected to the top of the fourth inclined ladder (2-4), and the bottom of the fourth inclined ladder (2-4) is connected to the sixth transportation platform (3-6); the sixth transportation platform (3-6) is connected to the top of the fifth inclined ladder (2-5), and the bottom of the fifth inclined ladder (2-5) is connected to the seventh transportation platform (3-7); the seventh transportation platform (3-7) is connected to the top of the sixth inclined ladder (2-6), and the bottom of the sixth inclined ladder (2-6) is connected to the main deck; The fourth traffic platform (3-4) is arranged above the gas equipment room through a bracket, the fifth traffic platform (3-5) is arranged on the top surface of the gas equipment room, the sixth traffic platform (3-6) is arranged outside the gas equipment room, and the seventh traffic platform (3-7) is arranged on the bottom surface of the gas equipment room; The other side of the first operating platform (3-1) in the working area 1 is connected to the third traffic platform (3-3), the third traffic platform (3-3) is connected to the top of the seventh inclined ladder (2-7), the bottom end of the seventh inclined ladder (2-7) is connected to the escape tower (1), the escape tower (1) is provided with a first straight ladder (5-1) and a second straight ladder (5-2), and the bottom end of the second straight ladder (5-2) is provided on the main deck; The first escape route of work area 1 is: first operating platform (3-1) → second traffic platform (3-2) → first inclined ladder (2-1) → second inclined ladder (2-2) → fourth traffic platform (3-4) → third inclined ladder (2-3) → fifth traffic platform (3-5) → fourth inclined ladder (2-4) → sixth traffic platform (3-6) → fifth inclined ladder (2-5) → seventh traffic platform (3-7) → sixth inclined ladder (2-6) → main deck; The second escape route of the work area 1 is: the first operating platform (3-1) → the third traffic platform (3-3) → the seventh inclined ladder (2-7) → the first straight ladder (5-1) → the second straight ladder (5-2) → the main deck; The working area 2 is connected to the bottom end of the eighth inclined ladder (2-8), and the top end of the eighth inclined ladder (2-8) is connected to one end of the eighth traffic platform (3-8); the other end of the eighth traffic platform (3-8) is connected to the top end of the ninth inclined ladder (2-9), and the bottom end of the ninth inclined ladder (2-9) is arranged on the ninth traffic platform (3-9); the ninth traffic platform (3-9) is connected to the top end of the third straight ladder (5-3), and the bottom end of the third straight ladder (5-3) is arranged on the bottom surface of the gas equipment room; the bottom surface of the gas equipment room is connected to the top end of the tenth inclined ladder (2-10), and the bottom end of the tenth inclined ladder (2-10) is arranged on the main deck; One side of the eighth traffic platform (3-8) is connected to the top of the ninth inclined ladder (2-9), and the bottom of the ninth inclined ladder (2-9) is connected to the fourth traffic platform (3-4); The first escape route of work area 2 is: work area 2 → eighth inclined ladder (2-8) → eighth traffic platform (3-8) → ninth inclined ladder (2-9) → fourth traffic platform (3-4) → third inclined ladder (2-3) → fifth traffic platform (3-5) → fourth inclined ladder (2-4) → sixth traffic platform (3-6) → fifth inclined ladder (2-5) → seventh traffic platform (3-7) → sixth inclined ladder (2-6) → main deck; The second escape route of work area 2 is: work area 2 → the eighth inclined ladder (2-8) → the eighth traffic platform (3-8) → the ninth inclined ladder (2-9) → the ninth traffic platform (3-9) → the third vertical ladder (5-3) → the tenth inclined ladder (2-10) → the main deck; The working area three is connected to the bottom end of the third inclined ladder (2-3), and the top end of the third inclined ladder (2-3) is connected to the fourth traffic platform; the fourth traffic platform (3-4) is connected to the top end of the ninth inclined ladder (2-9), and the bottom end of the ninth inclined ladder (2-9) is connected to the eighth traffic platform (3-8); The working area 3 is also connected to the fifth transportation platform (3-5); The first escape route of work area three is: work area three → fifth traffic platform (3-5) → fourth inclined ladder (2-4) → sixth traffic platform (3-6) → fifth inclined ladder (2-5) → seventh traffic platform (3-7) → sixth inclined ladder (2-6) → main deck; The second escape route of work area three is: work area three → third inclined ladder (2-3) → fourth traffic platform (3-4) → ninth inclined ladder (2-9) → ninth traffic platform (3-9) → third vertical ladder (5-3) → tenth inclined ladder (2-10) → main deck; The work area 4 is provided with a front door and a rear door, the bottom surface of the gas equipment room at the front door is connected to the top end of the tenth inclined ladder (2-10), and the bottom end of the tenth inclined ladder (2-10) is arranged on the main deck; the tenth traffic platform (3-10) is provided at the rear door, the tenth traffic platform (3-10) is connected to the top end of the eleventh inclined ladder (2-11), and the bottom end of the eleventh inclined ladder (2-11) is arranged on the main deck; The first escape route of work area 4 is: rear door of work area 4 → 10th traffic platform (3-10) → 11th inclined ladder (2-11) → main deck; The second escape route of work area four is: front door of work area four → tenth inclined ladder (2-10) → main deck.

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