Layered design method for pipe rack of liquid cargo system of liquefied gas carrier

Abstract

This application provides a layered design method for the pipe rack of a liquefied gas carrier's cargo system, comprising: determining the total space for the pipe rack layout based on a pipeline distribution model; dividing the total space in the height direction to generate multiple pipe rack space layers corresponding to the layout of the pipeline distribution model; determining the maximum length and maximum width of each pipe rack space layer to generate a pipe rack space 6 corresponding to each pipe rack space layer; determining the pipe rack model within each pipe rack space 6; defining each pipe rack model within each pipe rack space 6 as an installation unit; and disassembling the pipe rack model within an installation unit into multiple fabrication component models; and outputting the fabrication drawings corresponding to the fabrication component models and the assembly drawings corresponding to the installation units, thereby completing the pipe rack design. This application significantly improves construction efficiency and enhances the construction accuracy and overall construction quality of the pipe rack.

Description

Technical Field

[0001] This application relates to the field of ship design and construction technology, and more specifically, to a method for layered design of the cargo system pipe rack of a liquefied gas carrier. Background Technology

[0002] As the core maritime transport carrier for cryogenic liquefied gases such as liquefied natural gas and liquefied petroleum gas, liquefied gas carriers have very high requirements for construction efficiency and operational safety.

[0003] The liquefied cargo system is the core functional system of an LPG carrier, referring to the complete set of equipment, pipelines, and outfitting components used to handle liquefied gases on board. The liquefied cargo system covers the entire process of liquefied gas storage, loading, transmission, and unloading, ensuring the safety and efficiency of liquefied gas transport at sea through various supporting technical equipment and safety control measures.

[0004] The equipment and piping of the liquid cargo system are mainly distributed in core compartments such as the main deck area and compressor room area, specifically encompassing multiple functional subsystems including deck water spray system, remote control valve hydraulic system, inert gas system, compressed air system, and gas detection system. The piping models of these subsystems differ significantly in functional positioning and spatial arrangement. Therefore, the liquid cargo pipe racks used to support and fix these various pipelines must be modified synchronously with adjustments to the piping layout, increasing the complexity of ship design and on-site construction.

[0005] In the traditional design mode of existing liquefied gas carrier cargo system pipe racks, the pipe rack model is usually designed as a single unit in a vertical "portal" style, and each "portal" pipe rack is delivered directly to the ship installation site for construction as an independent fabrication unit.

[0006] Traditional design patterns have obvious technical shortcomings:

[0007] Because the pipe rack is an independent, single-unit fabrication component, the installation of the liquefied cargo pipeline and the pipe rack cannot be carried out in parallel during on-site construction. Only a series construction mode can be adopted, in which the pipe rack is installed first and then the pipeline is laid. This not only significantly extends the overall construction cycle of the ship, but also results in a large occupation of construction resources such as slipways, manpower, and equipment, which cannot meet the core industry requirements of the current mass production and efficient construction of liquefied gas carriers.

[0008] In summary, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0009] The purpose of this application is to provide a layered design method for the pipeline system of a liquefied gas carrier, which can significantly improve construction efficiency, construction accuracy of the pipeline, and overall construction quality.

[0010] This application provides a method for layered design of the cargo system piping of an LPG carrier, including the following steps:

[0011] S1. Determine the total space for the arrangement of pipe racks based on the pipe distribution model, and divide the total space in the height direction to generate multiple pipe rack space layers corresponding to the arrangement of the pipe distribution model.

[0012] S2. Determine the maximum length and maximum width of each of the tube rack space layers to generate a tube rack space 6 corresponding to each of the tube rack space layers;

[0013] S3. Determine the tube rack model within each of the tube rack spaces 6;

[0014] S4. Define each pipe rack model in the pipe rack space 6 as an installation unit, and divide the pipe rack model in one installation unit into multiple fabrication part models;

[0015] S5. Output the fabrication drawings corresponding to the fabricated parts model and the assembly drawings corresponding to the installation units to complete the pipe rack design.

[0016] In one feasible approach, in step S1, the number of pipeline layers of the liquid cargo system is obtained, the number of pipe rack space layers is determined based on the number of pipeline layers, and multiple pipe rack space layers are set from bottom to top along the height direction.

[0017] In one feasible approach, the height between two adjacent pipe rack space layers is determined based on the lifting capacity.

[0018] In one implementable manner, step S1 further includes the following:

[0019] If the number of pipes in one of the pipe rack space layers is less than a preset value, the current pipe rack space layer will be merged with the adjacent next lower pipe rack space layer.

[0020] In one feasible embodiment, step S2, when performing spatial partitioning, further includes the following:

[0021] The width and length of each corresponding pipe rack space 6 are determined by the maximum length and maximum width of the pipe rack space layer.

[0022] In one feasible approach, in step S2, when determining the length and width of each of the said tube rack space layers, the ship section gap is used as a boundary condition.

[0023] In one feasible approach, in step S3, the tube rack model within each of the tube rack spaces 6 is determined to include at least the following:

[0024] S31. Obtain the reinforcing structure under the ship's deck and the centerline of the reinforcing structure, respectively;

[0025] S32. Determine all intersections of the center lines;

[0026] S33. Generate a pipe rack model arranged along the height direction at each of the intersection points;

[0027] S34. Generate pipe rack models arranged along the length direction and pipe rack models arranged along the width direction at the top of the pipe rack model arranged along the height direction.

[0028] In one feasible approach, the tube rack model within each of the installation units is disassembled according to the manufacturing and transportation conditions.

[0029] In one feasible embodiment, the reinforcing structure includes at least reinforcing ribs or T-shaped steel.

[0030] In one feasible embodiment, the pipe support is a square steel pipe, a round pipe, or an H-beam.

[0031] In one feasible approach

[0032] Compared with the prior art, the beneficial effects of this application are as follows:

[0033] In the technical solution of this application, by adopting a decomposition design approach from the whole to the layer and from the unit to the part, the systematic decomposition of the liquid cargo pipe rack is completed in the design stage, and the construction drawings corresponding to the installation unit and the fabricated parts are directly output. This makes the design results accurately match the on-site construction requirements, reduces the time for secondary decomposition and coordination on site, and enhances the design's guidance for construction.

[0034] Based on the layered and unit-based design, the components of each layer of pipe racks can be prefabricated simultaneously during on-site construction, and each installation unit can also independently carry out pipeline laying and assembly operations within the unit. This changes the traditional sequential construction mode where each process waits in turn, and realizes true parallel operation of pipe rack fabrication and pipeline installation.

[0035] By adopting a layered design approach, the liquid cargo pipe racks are rationally layered according to the spatial distribution of pipelines. Different pipe rack layers can be installed independently and in parallel on-site. Finally, the system can be completed simply by assembling the main sections or hoisting the entire system, which greatly shortens the installation cycle of the liquid cargo system.

[0036] This application significantly improves construction efficiency through modular parallel construction. At the same time, since each installation unit can be independently subject to quality control during the prefabrication and assembly stages, it effectively reduces the accumulation of errors and mutual interference caused by cross-operations on site, thereby greatly improving the construction accuracy and overall construction quality of the pipe rack. It is particularly suitable for scenarios such as space constraints and dense pipelines in liquid cargo systems. Attached Figure Description

[0037] Figure 1 This is a flowchart of a layered design method for the cargo system pipe rack of a liquefied gas carrier according to an embodiment of the present invention.

[0038] Figure 2 This is a schematic diagram of the structure of the pipe rack space layer in the layered design method of the liquid cargo system pipe rack of the liquefied gas carrier according to an embodiment of the present invention.

[0039] Figure 3 This is a schematic diagram of the structure of the pipe rack space in the layered design method of the liquid cargo system pipe rack of the liquefied gas carrier according to an embodiment of the present invention.

[0040] Figure 4 This is a schematic diagram of the extended structure of the pipe rack model in the layered design method of the liquid cargo system pipe rack of the liquefied gas carrier according to an embodiment of the present invention.

[0041] The reference numerals in the attached figures are explained as follows:

[0042] 1. First tube rack space layer; 2. Second tube rack space layer; 3. Third tube rack space layer; 4. Centerline; 5. Extension structure; 6. Tube rack space. Detailed Implementation

[0043] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0044] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0047] See Figures 1 to 4 This application provides a method for layered design of the cargo system piping of an LPG carrier, comprising the following steps:

[0048] S1. Determine the total space for the pipe rack layout based on the pipe distribution model, and divide the total space in the height direction to generate multiple pipe rack space layers corresponding to the layout of the pipe distribution model.

[0049] Specifically, in 3D design software, the actual distribution of each pipeline of the liquid cargo system in the deck area and the number of pipeline layers are obtained. Based on the number of pipeline layers, the number of pipe rack space layers is determined. Multiple pipe rack space layers are set from bottom to top along the height direction so that each pipeline layer corresponds to one pipe rack space layer, which facilitates layered construction.

[0050] In this embodiment, as Figure 2 As shown, along the ship's height direction, it includes a first tube rack space layer 1, a second tube rack space layer 2, and a third tube rack space layer 3 in sequence.

[0051] It should be noted that in this embodiment, the height between two adjacent pipe rack space layers is less than or equal to 5.5 meters. The height between two adjacent pipe rack space layers is determined based on the hoisting capacity.

[0052] It should also be noted that when the number of pipes in one of the pipe rack space layers is less than the preset value, the current pipe rack space layer will be merged with the adjacent next lower pipe rack space layer to reduce the number of pipe rack space layers and facilitate design management.

[0053] S2. Determine the maximum length and maximum width of each of the tube rack space layers to generate a tube rack space 6 corresponding to each of the tube rack space layers.

[0054] In one possible implementation, the width and length of each corresponding tube rack space 6 are determined based on the maximum length and maximum width of the tube rack space layer.

[0055] In one possible implementation, in step S2, when determining the length and width of each of the pipe rack space layers, the ship section seam is used as a boundary condition to avoid the pipe rack space 6 being arranged across the seam, thereby ensuring that the pipe rack space 6 and the hull section construction can be carried out in a coordinated manner.

[0056] In one possible implementation, in step S2, when determining the length and width of each of the pipe rack space layers, it is also necessary to determine them based on the construction conditions of installation and hoisting.

[0057] In this embodiment, as Figure 3 As shown, the length of each pipe rack space 6 is less than or equal to 23 meters and the width is less than or equal to 12 meters.

[0058] S3, such as Figure 3 As shown, the tube rack model within each of the tube rack spaces 6 is determined.

[0059] In one possible implementation, in step S3, it is determined that the tube rack model within each tube rack space 6 includes at least the following:

[0060] S31. Obtain the reinforcing structure under the ship's deck and the centerline 4 of the reinforcing structure respectively;

[0061] S32. Determine all intersections of the center lines;

[0062] S33. Generate a pipe rack model arranged along the height direction at each intersection point.

[0063] Specifically, the centerlines of the reinforcing structures along the ship's length and width are obtained separately, and the intersection of these two centerlines is also obtained. At the intersection, a tube frame model in the height direction is generated vertically upwards.

[0064] It should be noted that the endpoints of the vertical pipe rack model are set to coincide with the intersection points.

[0065] It should also be noted that the reinforced structure includes at least reinforcing ribs or T-shaped steel.

[0066] S34. Generate pipe rack models arranged along the length direction and pipe rack models arranged along the width direction at the top of the pipe rack model arranged along the height direction.

[0067] It should be noted that if the length of the pipeline model exceeds that of the pipe rack model in the horizontal direction, the pipe rack model can be extended. Figure 4 This is a schematic diagram of the extended structure of the pipe rack model.

[0068] It should also be noted that the axis of the horizontal tube rack model coincides with the center line 4 of the reinforcing structure when projected onto the horizontal plane of the ship's deck.

[0069] In one feasible embodiment, the pipe support is a square steel pipe, a round pipe, or an H-beam.

[0070] In a typical embodiment of an LPG carrier, the vertical pipe supports are made of square steel tubing with dimensions of 160mm × 160mm and a plate thickness of 8mm. The horizontal pipe supports are made of H-beams with dimensions of H175mm × 175mm × 7.5mm × 11mm, or H-beams with dimensions of H150mm × 150mm × 7mm × 10mm.

[0071] In the embodiment of the large liquefied gas carrier, the vertical pipe support is made of round pipe with a diameter of 200mm and a plate thickness of 10mm. The horizontal pipe support is made of H-beams with dimensions of H200mm×200mm×8mm×12mm.

[0072] S4. Define each pipe rack model in each pipe rack space 66 as an installation unit, and split the pipe rack model in one installation unit into multiple fabrication part models.

[0073] It should be noted that the installation unit is the basic unit for on-site hoisting and assembly. The fabricated model is the basic unit for manufacturing and transportation.

[0074] In one feasible approach, the tube rack model within each of the installation units is disassembled according to the manufacturing and transportation conditions.

[0075] In this embodiment, the length of the fabricated model is less than or equal to 10 meters, the width is less than or equal to 3.5 meters, and the height is less than or equal to 2.5 meters.

[0076] It should be noted that when splitting, the rationality of the nodes and connections of the pipe rack itself must be considered, as well as the distribution of the pipelines.

[0077] S5. Output the fabrication drawings corresponding to the fabricated parts model and the assembly drawings corresponding to the installation units to complete the pipe rack design.

[0078] It should be noted that the fabrication drawings are used for material preparation, processing, and prefabrication in the workshop. The assembly drawings not only include fabrication information for all pipe racks within the corresponding installation unit, but also the location information for other outfitting components such as pipes and valves that need to be installed within the installation unit, to guide the unitized installation on site.

[0079] Specifically, the first assembly drawing is the assembly drawing of one installation unit corresponding to the first pipe rack space layer 1. The second assembly drawing is the assembly drawing of one installation unit corresponding to the second pipe rack space layer 2. The third assembly drawing is the assembly drawing of one installation unit corresponding to the third pipe rack space layer 3.

[0080] In summary, this application employs a decomposition design approach, moving from the overall structure to layers and from units to components. This allows for the systematic breakdown of the liquid cargo pipe rack during the design phase, directly generating construction drawings corresponding to installation units and fabricated components. This ensures a precise match between the design and on-site construction needs, reducing the time spent on secondary decomposition and coordination on-site and enhancing the design's guidance for construction. Based on the layered and unit-based design, the fabrication of components for each layer of the pipe rack can be carried out simultaneously and in parallel during on-site construction. Each installation unit can also independently perform pipeline laying and assembly operations within the unit, changing the traditional sequential construction model where each process waits for the next, and achieving true parallel operation of pipe rack fabrication and pipeline installation. By using layered design as a guide, the liquid cargo pipe rack is rationally layered according to the spatial distribution of the pipelines. Different pipe rack layers can be installed independently and in parallel on-site, and the system can be completed simply by assembling the main sections or hoisting the entire system, significantly shortening the installation cycle of the liquid cargo system. This application significantly improves construction efficiency through modular parallel construction. At the same time, since each installation unit can be independently subject to quality control during the prefabrication and assembly stages, it effectively reduces the accumulation of errors and mutual interference caused by cross-operations on site, thereby greatly improving the construction accuracy and overall construction quality of the pipe rack. It is particularly suitable for scenarios such as space constraints and dense pipelines in liquid cargo systems.

[0081] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method of designing a pipe rack layering of a liquid cargo system of a liquefied gas carrier, characterized in that, Includes the following steps: S1. Determine the total space for the arrangement of pipe racks based on the pipe distribution model, and divide the total space in the height direction to generate multiple pipe rack space layers corresponding to the arrangement of the pipe distribution model. S2. Determine the maximum length and maximum width of each of the tube rack space layers to generate a tube rack space 6 corresponding to each of the tube rack space layers; S3. Determine the tube rack model within each of the tube rack spaces 6; S4. Define each pipe rack model in the pipe rack space 6 as an installation unit, and divide the pipe rack model in one installation unit into multiple fabrication part models; S5. Output the fabrication drawings corresponding to the fabricated parts model and the assembly drawings corresponding to the installation units to complete the pipe rack design.

2. The method of the cargo piping arrangement layering design for a liquefied gas carrier of claim 1, wherein In step S1, the number of pipeline layers of the liquid cargo system is obtained, and the number of pipe rack space layers is determined based on the number of pipeline layers. Multiple pipe rack space layers are set from bottom to top along the height direction.

3. The method of the cargo piping arrangement layering design for a liquefied gas carrier of claim 2, wherein The height between two adjacent pipe rack space layers is determined based on the hoisting capacity.

4. The method for designing the piping rack layer of the liquid cargo system of the liquefied gas carrier according to claim 3, characterized in that, Step S1 also includes the following: If the number of pipes in one of the pipe rack space layers is less than a preset value, the current pipe rack space layer will be merged with the adjacent next lower pipe rack space layer.

5. The method for designing the piping rack layer of the liquid cargo system of the liquefied gas carrier according to claim 1, wherein In step S2, the spatial partitioning also includes the following: The width and length of each corresponding pipe rack space 6 are determined by the maximum length and maximum width of the pipe rack space layer.

6. The method for layered design of the cargo system piping of an LPG carrier according to claim 5, characterized in that, In step S2, when determining the length and width of each of the said tube rack space layers, the ship section gap is used as a boundary condition.

7. The method for layered design of the cargo system piping of a liquefied gas carrier according to claim 1, characterized in that, In step S3, the tube rack model within each tube rack space 6 is determined to include at least the following: S31. Obtain the reinforcing structure under the ship's deck and the centerline of the reinforcing structure, respectively; S32. Determine all intersections of the center lines; S33. Generate a pipe rack model arranged along the height direction at each of the intersection points; S34. Generate pipe rack models arranged along the length direction and pipe rack models arranged along the width direction at the top of the pipe rack model arranged along the height direction.

8. The method for designing the piping rack layer of the liquid cargo system of the liquefied gas carrier according to claim 1, wherein The tube rack model within each installation unit is disassembled according to the manufacturing and transportation conditions.

9. The method for layered design of the cargo system piping of an LPG carrier according to claim 7, characterized in that, The reinforcing structure includes at least reinforcing ribs or T-shaped steel.

10. The method for designing the piping rack layering of a liquid cargo system of a liquefied gas carrier according to claim 1, wherein The pipe rack is made of square steel pipe, round pipe or H-beam.

Images