Design method for cargo hold area of ​​ships with multiple single-tube C-type tanks arranged side by side

Abstract

The present invention belongs to the field of ship cargo hold area design, and specifically relates to a ship cargo hold area design method for a plurality of single-tube C-type tanks arranged side by side, comprising the following steps: S1: determining the volume of a single tank V ; S2: Determine the alternative arrangement of cargo tanks; S3: Determine the corresponding cargo hold area size of the alternative; S4: L / B ] to screen and obtain the arrangement schemes of multiple groups of cargo tanks in the cargo hold area, determine the optimal cargo tank design scheme and cargo tank arrangement scheme, and obtain the determined key design parameters of the cargo hold area. The design method of the present invention arranges the cargo hold area reasonably, can effectively optimize the ship size, design the ship with a reasonable length / width ratio, and improve port suitability and stability. It effectively optimizes the ship economy and engineering applicability.

Description

Technical Field

[0001] The invention belongs to the field of ship cargo hold area design, and in particular relates to a ship cargo hold area design method in which a plurality of single-tube C-type tanks are arranged side by side. Background Art

[0002] The special physical and chemical properties of carbon dioxide determine that the design pressure of liquefied carbon dioxide transport ships is usually high, which places strict requirements on the design and manufacture of carbon dioxide cargo tanks.

[0003] Based on the current manufacturing capacity and from the economic point of view, most of the carbon dioxide liquid cargo tanks use independent single cylindrical C-type tanks, and the diameter design of the C-type tank is limited and the total tank capacity is limited. For medium-pressure carbon dioxide transport ships with a design pressure of about 19 barg, the maximum design diameter of the single cylindrical C-type tank is about 11.5m, and the maximum tank capacity is about 4000m 3 For low-pressure CO2 carriers with a design pressure of about 8 barg, the maximum design diameter of a single cylindrical C-type tank is about 14.3m, and the maximum tank capacity is about 8500m 3 For a 50,000 cubic meter CO2 carrier, the low-pressure solution requires 6 liquid cargo tanks and the medium-pressure solution requires 13 liquid cargo tanks.

[0004] If the conventional liquefied gas tanker layout of the prior art is adopted, the cargo hold capacity requirement can only be met by extending in the length direction, resulting in a ship design with a very large length / width, poor port suitability, small ship stability margin, and a very unreasonable ship design. Summary of the invention

[0005] The present invention aims to solve the problems in the prior art that the cargo hold capacity requirement is ensured by extending in the length direction, which leads to a very large length / width of the ship design, poor port suitability, small ship stability margin, and very unreasonable ship design. A method for designing a ship cargo hold area with multiple single-tube C-type tanks arranged side by side is provided, comprising the following steps:

[0006] S1: Determine the volume of a single tank V :

[0007] According to the radius of the tank R and aspect ratio η Get the volume of a single tank V ;

[0008] S2: Determine alternative tank layout options:

[0009] According to the tank volume V Total number of tanks n , and obtain feasible tank design and layout solutions, that is, feasible tank radius R , aspect ratio η And the number of vertical columnsN 1 , Horizontal arrangement rows N 2 Combination scheme;

[0010] S3: Determine the corresponding cargo hold area dimensions for the alternative solutions:

[0011] According to the alternative tank arrangement scheme determined in step S2, the length of the cargo hold area of ​​each group of schemes is calculated. L ;

[0012] Calculate the width of the cargo hold area for each alternative, i.e. the ship width B ;

[0013] S4: Cargo hold area dimensions [ L / B ] for screening;

[0014] According to the cargo hold area dimensions corresponding to the cargo tank arrangement alternatives determined in step S2, the optimal cargo hold area design scheme using multiple single-tube C-type tanks arranged side by side is selected, that is, this step determines the cargo tank design parameters:

[0015] Tank radius R , aspect ratio η , and multiple tank layout plans;

[0016] Number of vertical columns N 1 , Horizontal arrangement rows N 2 .

[0017] According to the above-mentioned method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side, in step S1:

[0018] V =(4 / 3+ η ) πR 3 (1- gx ),in:

[0019] V : Single tank volume;

[0020] R : radius of the cargo tank;

[0021] η : aspect ratio;

[0022] gx : Component coefficient.

[0023] According to the above-mentioned method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side, step S2 includes the following steps:

[0024] S2.1: Calculate the total number of tanks required n ;

[0025] in: n =Target capacity / V ;

[0026] in: n The screening conditions are: all calculation results are rounded up to the minimum value; the unit of target tank capacity is m 3 ;

[0027] After screening, multiple groups of cargo tank design solutions that meet the target tank capacity are obtained, namely, [ R ]and[ η ] are numbered in the order of I, II, etc.;

[0028] S2.2: Determine alternative arrangements for tanks in the cargo hold area:

[0029] n = N 1 ×N 2 ,or, n = N 1 ×N 2 -1, where:

[0030] N 1 : The number of rows of cargo tanks arranged vertically, which must be an integer;

[0031] N 2 : The number of rows of cargo tanks arranged horizontally, which must be an integer;

[0032] After screening, the arrangement scheme of multiple groups of cargo tanks in the cargo hold area is obtained, that is, [ N 1 ] and[ N 2 ] are numbered in sequence of a, b, c….

[0033] According to the above-mentioned method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side, step S3 includes the following steps:

[0034] S3.1: Calculation of cargo hold area length L ;

[0035] L =( η×R+2×R+l a +l f )×N1 ;

[0036] in:

[0037] L : Cargo hold area length;

[0038] l a : The distance between the cargo tank and the rear bulkhead;

[0039] l f : The distance between the cargo tank and the rear bulkhead;

[0040] S3.2: Calculation of the ship's moulded breadth B ;

[0041] B =2 ×R×N 2 +2 ×B S + B B × ( N 2 -1), where:

[0042] B :Calculate the ship's breadth;

[0043] B S : The distance between the tank and the outer plate;

[0044] B B : The distance between two adjacent tanks;

[0045] Get multiple groups of cargo hold area dimensions, that is, corresponding to the combination of step S2.1 and step S2.2 respectively [ L / B ]Calculated value.

[0046] According to the above-mentioned method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side, in step S4:

[0047] Take 3.5≤ L / B ≤5.0;

[0048] For the parameters in step 3 l a , l f , B S , B B It can be adjusted within a given range, and after fine-tuning, multiple sets of cargo area dimensions can be obtained;

[0049] Based on the screening results, the cargo tank design and layout can be finally determined, that is, the key design parameters of the cargo hold area can be determined. R, η, N 1 、N 2 、l a , l f , B S , B B 。

[0050] Calculate the ship's molded depth D :

[0051] D =2 ×R + H 1 + H 2 + H 3 ;in:

[0052] H 1 is the height of the double bottom;

[0053] H 2 It is the distance between the lowest point of the tank and the double bottom;

[0054] H 3 It is the distance from the highest point of the tank to the double bottom.

[0055] According to the above-mentioned method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side, in step S2.2:

[0056] When the total number of cargo tanks n= N 1 ×N 2 When the ship is under construction, a double bottom and single side shell arrangement is adopted;

[0057] When the total number of cargo tanks n= N 1 ×N 2 -1, the inner bottom of the first cargo hold area adopts a double bottom form, an inner bottom plate is arranged, the side adopts a double side shell arrangement form, and the cargo hold inner hull; the bottom of the remaining cargo hold areas also adopts a double bottom form, an inner bottom plate is arranged, the side adopts a single side shell form, and the cargo hold double hull structure is not arranged.

[0058] According to the above-mentioned method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side, step S4 includes: designing the topside tank and hopper tank structures of a typical cross section;

[0059] The topside tank is in a right-angle transition form with the hull outer plate and the deck, and the topside tank is composed of a first top plate, a first bottom plate, and a first inclined plate;

[0060] The hopper tank and the hull outer plate are in a right-angle transition form, and the hopper tank is composed of a second top plate, a second inclined plate, and an inner bottom plate;

[0061] The topside tank and hopper tank structural design features of the typical cross section are: the first inclined plate and the second inclined plate are arranged outside the arrangement limit line, and the distance from the arrangement limit line is less than 4m, so as to facilitate the design of the anti-floating structure;

[0062] The layout restriction line is set 550mm to 850mm outward from the theoretical line of the liquid cargo tank steel structure;

[0063] The angle Ω between the first inclined plate and the second inclined plate and the horizontal line is set to 30° to 60°;

[0064] The first top plate height ht1 is set to 0.5m to 2.0m;

[0065] The width of the first bottom plate and the second top plate is set to 0.8m to 2.0m.

[0066] According to the above-mentioned method for designing a cargo hold area of ​​a ship in which a plurality of single-tube C-type tanks are arranged side by side, step S4 includes: deck design: the deck is arranged in a flat deck form, and a large deck strong longitudinal girder is arranged in the middle of the cargo tank.

[0067] The beneficial effects of the present invention are as follows:

[0068] 1. According to the design method of the present invention, feasible tank design and arrangement schemes are obtained according to the tank volume and the total number of tanks for screening, and the optimal tank radius, aspect ratio, longitudinal arrangement number, and transverse arrangement number combination scheme are obtained, which can make full use of the cargo hold area, increase the tank capacity utilization rate, and design a ship with better economy;

[0069] 2. According to the design method of the present invention, based on the optimal cargo tank arrangement scheme, the length of the cargo hold area of ​​the preferred scheme is calculated. 、 Cargo hold area width, calculated as ship width B The ship's dimensions are reasonably designed, with an optimal length / width ratio, and its port suitability, stability and longevity are all improved;

[0070] 3. According to the design method of the present invention, the optimal cargo hold area design scheme of multiple single-tube C-type tanks arranged side by side is adopted to determine the design parameters of the cargo tanks. The cargo hold area layout and the liquid cargo tank size are reasonably designed, and the design scheme has strong engineering applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 It is a schematic diagram of the design process of the present invention.

[0072] Figure 2 It is a conventional arrangement schematic diagram of the prior art.

[0073] Figure 3 It is a schematic diagram of a multi-row arrangement of the present invention.

[0074] Figure 4 1 is a top view of an embodiment of the present invention (A).

[0075] Figure 5 1 is a top view of an embodiment of the present invention (B).

[0076] Figure 6 Schematic diagram of a typical cross-sectional arrangement of the present invention (A).

[0077] Figure 7 Schematic diagram of a typical cross-sectional arrangement of the present invention (B). DETAILED DESCRIPTION

[0078] Preferred Embodiments

[0079] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0080] In this implementation, a 50,000 cubic meter low-pressure liquid carbon dioxide transport ship is designed. According to this design method, the parameters to be determined are the tank arrangement parameters N 1 and N 2 and tank size parameters R and η The design method flow is as follows Figure 1 shown.

[0081] According to step 1, determine the volume of a single tank V :

[0082] V =(4 / 3+ η ) πR 3 (1- gx ),in:

[0083] V :Single tank volume (m 3 );

[0084] R : Radius of cargo tank (m);

[0085] η : aspect ratio;

[0086] gx : component coefficient;

[0087] η The value range is 3 to 8.5;

[0088] gx Take 0.3%;

[0089] The judgment conditions are:

[0090] a. When the design pressure is 8 barg: V ≤8700m 3 ;

[0091] b. When the design pressure is 19 barg: V ≤4000m 3 ;

[0092] That is, the warehouse capacity is too large and does not conform to reality.

[0093] The results are shown in Table 1.

[0094] Delete data that does not meet the requirements based on the above judgment conditions.

[0095] According to step S2:

[0096] S2.1: Calculate the total number of tanks required n ;

[0097] in: n =Target capacity / V ;

[0098] in:

[0099] n The screening condition is: after all calculation results are rounded up, take the minimum value;

[0100] Table 1 Calculation results of liquid cargo tank volume V

[0101]

[0102] After screening, multiple groups of cargo tank design solutions that meet the target tank capacity are obtained, namely, [ R ]and[ η ] combinations, numbered I, II, etc. The results are shown in Table 2.

[0103] Table 2 Screening of cargo tank design solutions that meet target tank capacity

[0104]

[0105] S2.2: Determine alternative arrangements for tanks in the cargo hold area:

[0106] n = N 1 ×N 2 ,or, n = N 1 ×N 2 -1, where:

[0107] N 1 : The number of rows of cargo tanks arranged vertically, which must be an integer;

[0108] N 2 : The number of rows of cargo tanks arranged horizontally, which is an integer and can be: 1, 2, 3, 4;

[0109] After screening, the arrangement scheme of multiple groups of cargo tanks in the cargo hold area is obtained, that is, [ N 1 ]and[ N 2 ] combinations, numbered a, b, c...the results are shown in Table 3.

[0110] Table 3 Alternative table of cargo tank arrangement options

[0111]

[0112] According to step 3, different design solutions are obtained L / B ;

[0113] S3.1: Calculation of cargo hold area length L ;

[0114] L =( η×R+2×R+l a +l f )×N 1

[0115] As attached Figure 4 As shown: Among them:

[0116] L : Cargo hold area length;

[0117] l a : The distance between the cargo tank and the rear bulkhead;

[0118] Set to 700mm~2000mm;

[0119] l f : The distance between the cargo tank and the rear bulkhead;

[0120] l f Set to 700mm~2000mm;

[0121] S3.2: Calculation of the ship's moulded breadth B ;

[0122] B =2 ×R×N 2 +2 ×B S + B B × ( N 2 -1);

[0123] like Figure 5 As shown: Among them:

[0124] B :Calculate the ship's breadth;

[0125] B S : The distance between the tank and the outer plate;

[0126] B S Set to 1300mm~3500mm;

[0127] B B : The distance between two adjacent tanks;

[0128] Set to 1600mm~3000mm;

[0129] Get multiple groups of cargo hold area dimensions, that is, corresponding to the combination of step S2.1 and step S2.2 respectively [ L / B ]Calculated value.

[0130] The results are shown in Table 4.

[0131] Table 4 L / B Design results table

[0132]

[0133] in: l f Set to 1.8m, l aSet to 0.8m, B S Set to 3m, B B Set to 2m.

[0134] According to step 4, filter the results in Table 4:

[0135] Take 3.5≤ L / B ≤5.0;

[0136] For the parameters in step 3 l a , l f , B S , B B By making adjustments within a given range and fine-tuning, multiple sets of cargo hold area dimensions can be obtained, but all of them are similar design solutions.

[0137] Based on the screening results, the cargo tank design and layout can be finally determined, that is, the key design parameters of the cargo hold area can be determined. R, η, N 1 、N 2 、l a , l f , B S , B B 。

[0138] Finally, the cargo tank design plan IX and cargo tank layout plan b) were selected.

[0139] The determined design parameters of the cargo hold area are R=7.2m, η=6, N 2 =2, N 1 =3, such as Figure 4 As shown;

[0140] According to step 3, get the length of the cargo hold area L =(6×7.2+2×7.2+0.8+1.8)×3=180.6m; get the width of the cargo hold area B =2×7.2×2+2×3+2×(2-1)=36.8m;

[0141] According to this design method, the ship's molded depth is calculated. D ;

[0142] D =2×R + H 1 + H 2 + H 3 ;in:

[0143] H 1 is the height of the double bottom (m), H 1 ≥min( B / 15,2m);

[0144] Adjustments can be made taking into account the volume of ballast tanks and the construction of double bottoms;

[0145] H 2 is the distance from the lowest point of the tank to the double bottom (m);

[0146] Consider the tank plate thickness, insulation thickness, space required for structural layout, and inspection distance. H 2 Set to 900mm~2000mm;

[0147] H 3 is the distance from the highest point of the tank to the double bottom (m);

[0148] Consider the tank plate thickness, insulation thickness, space required for structural layout, and inspection distance. H 3 Set to 1800mm~2500mm;

[0149] The calculations show that:

[0150] Depth D =2×7.2+2+1.0+1.8=19.2m;

[0151] parameter H 1 , H 2 , H 3 It can be adjusted within a given range, and after fine-tuning, multiple sets of cargo area dimensions can be obtained, but all of them are similar designs;

[0152] According to this design method, n = N 1 ×N 2 , double bottom, single side arrangement such as Figure 6 As shown;

[0153] Continuing according to the present design method, the topside tank 100 and the bottom side tank 200;

[0154] The topside tank 100 is in a right-angle transition form with the hull outer plate 300 and the deck 400. The topside tank 100 is composed of a first top plate 1, a first bottom plate 31, and a first inclined plate 11.

[0155] The hopper tank 200 and the hull outer plate 300 are in a right-angle transition form, and the hopper tank 200 is composed of a second top plate 2, a second inclined plate 12, and an inner bottom plate 32;

[0156] The first inclined plate 11 and the second inclined plate 12 are arranged outside the arrangement restriction line 800, but the distance from the arrangement restriction line 800 should be less than 4m to facilitate the design of the anti-floating structure;

[0157] The layout restriction line 800 is set 550mm to 850mm outward from the theoretical line of the liquid cargo tank steel structure; Figure 6 As shown;

[0158] According to the present design method, the angle Ω between the first inclined plate 100 and the second inclined plate 200 of the top tank 100 and the horizontal line is set to be 30° to 60°. Figure 6 As shown;

[0159] According to the present design method, the height ht1 of the first top plate 1 of the top side tank 100 is set to 0.5m to 2.0m; Figure 6 As shown;

[0160] According to the present design method, the width of the first bottom plate 31 and the second top plate 2 of the top tank 100 and the bottom tank 200 is set to 0.8m to 2.0m; Figure 6 shown.

[0161] Continue to follow this design method to set a flat deck and set a large deck strong longitudinal girder 900 between the two tanks. Figure 6 shown.

[0162] According to this design method, multiple single-cylinder C-type tanks are arranged side by side in the cargo hold area, which rationally utilizes the hull space and optimizes the ship scale. The designed ship type is more engineering applicable and economical.

[0163] The ship involved in the invention adopts multiple single-tube C-type tanks arranged side by side on the basis of conventional design, and uses the design method of the invention to reasonably arrange the cargo hold area, which can effectively optimize the ship size, design the ship with a reasonable length / width ratio, and improve port suitability and stability. The ship economy and engineering applicability are effectively optimized.

[0164] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A design method for a ship cargo hold area with multiple single-tube C-type tanks arranged side by side, characterized in that : Includes the following steps: S1: Determine the volume V of a single tank: The volume V of a single tank is obtained according to the radius R of the cargo tank and the aspect ratio η; S2: Determine alternative tank layout options: According to the tank volume V and the total number of tanks n, a feasible tank design and layout scheme is obtained, that is, a feasible tank radius R, aspect ratio η, and the number of longitudinal arrangement rows N1 and the number of transverse arrangement rows N2; S3: Determine the corresponding cargo hold area dimensions for the alternative solutions: According to the alternative tank arrangement schemes determined in step S2, the cargo hold area length L of each group of schemes is calculated; The width of the cargo hold area of ​​each set of alternative solutions is calculated, i.e. the ship's breadth B; S4: Screening of cargo hold area dimensions [L / B]; The cargo hold area size corresponding to the alternative tank arrangement determined in step S2, Select the optimal cargo hold area design scheme with multiple single-tube C-type tanks arranged side by side. This step determines the cargo tank design parameters: Tank radius R, aspect ratio η, and multiple tank layout options; The number of rows arranged vertically is N1, and the number of rows arranged horizontally is N2.

2. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 1, characterized in that: In step S1: V=(4 / 3+η)πR 3 (1-gx), where: V: single tank volume; R: radius of cargo tank; η: aspect ratio; gx: component coefficient.

3. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 1, characterized in that: Step S2: comprising the following steps: S2.1: Calculate the total number of tanks required, n; Where: n = target tank capacity / V, Among them: the screening condition of n is: all calculation results are rounded up and the minimum value is taken; the unit of target tank capacity is m 3 ; After screening, multiple groups of cargo tank design solutions that meet the target tank capacity are obtained, that is, the combination of [R] and [η], which are numbered in the order of I, II, etc.; S2.2: Determine alternative arrangements for tanks in the cargo hold area: n = N1 × N2, or n = N1 × N2-1, where: N1: The number of rows of tanks arranged longitudinally, which must be an integer; N2: The number of rows of cargo tanks arranged horizontally, which must be an integer; After screening, the arrangement scheme of multiple groups of cargo tanks in the cargo hold area is obtained, that is, the combination of [N1] and [N2], numbered in the order of a, b, c...

4. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 1, characterized in that : In step S3: the following steps are included: S3.1: Calculate the cargo hold area length L; L=(η×R+2×R+l a +l f )×N1; in: L: length of cargo hold area; l a : The distance between the cargo tank and the rear bulkhead; l f : The distance between the cargo tank and the forward bulkhead; S3.2: Calculate the ship's moulded breadth B; B=2×R×N2+2×B S +B B ×(N2-1), in: B: Calculate the ship's breadth; B S : The distance between the tank and the outer plate; B B : The distance between two adjacent tanks; Multiple groups of cargo hold area dimensions are obtained, i.e., corresponding to the calculated values ​​of [L / B] in combination with step S2.1 and step S2.2, respectively.

5. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 4, characterized in that: In step S4: Take 3.5≤L / B≤5.0; For the parameter l in step S3 a , l f , B S , B B It can be adjusted within a given range, and after fine-tuning, multiple sets of cargo area dimensions can be obtained; According to the screening results, the cargo tank design scheme and cargo tank layout scheme can be finally determined, that is, the key design parameters R, η, N1, N2, l of the cargo hold area can be determined. a , l f , B S , B B .

6. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 1, characterized in that: In step S4: Calculate the ship's molded depth D, D = 2 × R + H1 + H2 + H3; in: H1 is the height of the double bottom; H2 is the distance from the lowest point of the tank to the double bottom; H3 is the distance from the highest point of the tank to the double bottom.

7. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 1, characterized in that: In step S2.2: When the total number of cargo tanks n = N1 × N2, a double bottom and single side arrangement is adopted.

8. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 1, characterized in that: In step S2.2: When the total number of cargo tanks n=N1×N2-1, the inner bottom of the first cargo hold area adopts a double bottom form, an inner bottom plate is set, the side adopts a double side shell arrangement form, and the cargo hold inner hull; the bottom of the remaining cargo hold areas also adopts a double bottom form, an inner bottom plate is set, the side adopts a single side shell form, and the cargo hold double hull structure is not set.

9. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 8, characterized in that: Step S4 includes: designing the topside tank and the bottom side tank structure including a typical cross section; the topside tank and the hull outer plate and the deck are all in a right-angle transition form, and the topside tank is composed of a first top plate, a first bottom plate, and a first inclined plate; The hopper tank and the hull outer plate are in a right-angle transition form, and the hopper tank is composed of a second top plate, a second inclined plate, and an inner bottom plate; The topside tank and hopper tank structural design features of the typical cross section are: the first inclined plate and the second inclined plate are arranged outside the arrangement limit line, and the distance from the arrangement limit line is less than 4m, so as to facilitate the design of the anti-floating structure; The arrangement restriction line is set at 550mm to 850mm outward from the theoretical line of the liquid cargo tank steel structure; the angle Ω between the first inclined plate and the second inclined plate and the horizontal line is set to 30° to 60°; the height ht1 of the first top plate is set to 0.5m to 2.0m; the width of the first bottom plate and the second top plate is set to 0.8m to 2.0m.

10. The method for designing a cargo hold area of ​​a ship with multiple single-tube C-type tanks arranged side by side according to claim 1, characterized in that: Step S4 includes deck design: the deck is set as a flat deck, and a large deck strong longitudinal girder is set in the middle of the cargo tank.

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