Method for determining bearing capacity of oil tanker deck piping system support
By using standardized inputs and iterative algorithms to calculate the support bearing capacity, the problem of inaccurate support selection and lagging design process in the design of deck piping systems for oil tankers was solved, enabling rapid support selection and improving design efficiency.
Patent Information
- Application Number
- CN202511873854.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-05-15
AI Technical Summary
In the design of deck piping systems for oil tankers, the preliminary design of support load-bearing capacity lacks a basis, leading to inaccurate selection and a lagging design process, which cannot meet the high-efficiency design requirements of large and intelligent oil tankers.
A standardized input method is adopted to establish the structural form of the pipe support system, and the ultimate bearing capacity of the support is calculated through finite element analysis and iterative algorithm. A table of combined working conditions bearing capacity is established, breaking the dependence on pipe stress analysis load input and realizing rapid selection and adaptability adjustment of the support.
It enables rapid selection and adaptation of support structures, improves the efficiency and flexibility of tanker deck piping design, and reduces material waste and subsequent adjustment costs.
Smart Images
Figure CN122046767A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of marine shipbuilding and design, and specifically relates to a method for determining the load-bearing capacity of a deck piping support for an oil tanker. Background Technology
[0002] In the design and optimization of deck piping systems on oil tankers, assessing the load-bearing capacity of piping supports is a core step in ensuring the safe and stable operation of the piping system. Currently, the industry generally relies on load data output by pipe stress analysis software as input for structural analysis of the load-bearing capacity of piping supports. That is, the overall stress analysis of the piping system must be completed first, and the specific load values of the supports must be obtained before the structural strength calculation of the supports themselves can be carried out.
[0003] This dependency has significant limitations: 1. Lack of basis for selection during the preliminary design phase, making accuracy difficult to guarantee. In the preliminary design phase of the piping system, pipe stress analysis has not yet been conducted, and clear support load input data cannot be provided. Designers can only rely on past project experience to estimate support selection. This experience-based selection method is prone to deviation from actual operating conditions, potentially leading to material waste due to conservative selection and increased costs for rework and adjustments due to insufficient load-bearing capacity estimation. 2. Delayed and cumbersome design process, resulting in low efficiency. Accurate support selection and load-bearing capacity assessment can only be carried out after the piping system stress analysis is completed and load data is output, causing the support design phase to lag significantly behind the overall piping system design process. More importantly, when any factor such as medium parameters or ship operating conditions changes and requires adjustments to the pipe stress analysis, the load on the support will change accordingly. Designers must remodel, calculate, and evaluate the support, resulting in iterative processes that greatly slow down the overall progress of the piping system design.
[0004] As oil tankers become larger and more intelligent, deck piping system layouts are becoming increasingly complex. The frequency of adjustments to pipe stress analysis and the precision requirements for support selection are constantly increasing. Traditional methods for calculating support load-bearing capacity, which rely on pipe stress analysis load input, can no longer meet the industry's demands for efficient design and rapid iteration. Therefore, there is an urgent need for a calculation method that can directly assess the load-bearing capacity of piping supports based on their structural form, breaking the dependence on pipe stress analysis load input, enabling rapid support selection and adaptation adjustments, and improving the efficiency and flexibility of oil tanker deck piping system design. Summary of the Invention
[0005] To address the above problems, this invention provides a method for determining the load-bearing capacity of a tanker deck piping support, the technical solution of which is as follows: A method for determining the load-bearing capacity of a deck piping support for an oil tanker, the specific operation of which is as follows: S1: Establish standardized input for the pipe support structure, including the definition of material properties, nodes, elements, constraints, and support loads. By inputting the standardized input of the above pipe support structure into any structural finite element analysis software, a finite element analysis can be performed to obtain the stress results of the beam model of the pipe support.
[0006] S2: Calculation of ultimate bearing capacity based on iterative algorithm. For a single loading point and a single load type, set the initial value and iteration step size, and complete the strength verification using finite element analysis. The strength verification adopts the API specification. Calculate the utilization coefficient UC value of the beam element until UC>1, at which point the iteration ends, and obtain the ultimate bearing capacity of a single loading point and a single load type, which is defined as the upper and lower limits of the value.
[0007] S3: Establish a table of combined load-bearing capacity. Based on the ultimate load-bearing capacity of a single loading point and a single load type, insert any number of intermediate value points (n) at equal intervals within the upper and lower limits, obtaining a total of n+2 value points including the upper and lower limits.
[0008] For multiple loading points and multiple load types, all combinations are traversed to obtain combined working conditions. Finite element analysis is used to calculate the UC value for each combined working condition. All combined working conditions with UC < 1 are saved to obtain the final table of bearing capacity of combined working conditions for pipe system supports.
[0009] Based on the load data given by the pipe stress analysis, compare it with the values in the bearing capacity table. If the load data is less than the values in the bearing capacity table, this type of pipe support can be selected, and the strength is sufficient.
[0010] Furthermore, the method for determining the load-bearing capacity of a deck piping support for an oil tanker, as described above, further includes standardized inputs such as: definitions of material properties, nodes, elements, constraints, and support loads.
[0011] Furthermore, the above method for determining the load-bearing capacity of a tanker deck piping support can be further defined as follows: if the UC value is <= 1, the piping support strength is sufficient; if the UC value is > 1, the piping support strength is insufficient.
[0012] The above-mentioned method for determining the bearing capacity of a tanker deck piping system support further includes, in step S2, calculating the utilization coefficient UC value of the beam system model of the piping system support based on the stress results of the beam system model of the piping system support and the steel structure design section (Section 3 - Structural Steel Design) in the API standard.
[0013] Furthermore, in the method for determining the bearing capacity of the deck piping support of an oil tanker, the initial iteration value is 0.01N.
[0014] Furthermore, the method for determining the load-bearing capacity of a deck piping system support for an oil tanker, as described above, further defines the support load by including the loading point and the type of load.
[0015] Furthermore, in the method for determining the bearing capacity of the deck piping support of an oil tanker, the iteration step size is 100N or -100N.
[0016] Furthermore, in the method for determining the load-bearing capacity of the deck piping support of an oil tanker, the piping support structure includes a horizontally arranged support beam and a support column below the support beam. The support beam is made of H-beam steel, and the support column is made of round steel.
[0017] This invention performs calculations on various types of pipe system supports, generating corresponding load-bearing capacity tables. For any support load input obtained from pipe stress analysis, rapid support selection can be achieved by referring to tables. This breaks the dependence on pipe stress analysis load input, enabling rapid support selection and adaptability adjustments, thus improving the efficiency and flexibility of oil tanker deck piping system design. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a certain type of deck piping support structure; Figure 2 yes Figure 1 A schematic diagram of the AA perspective in the diagram; Figure 3 This is a schematic diagram of the beam system model; Among them, 1-support beam, 2-support column. Detailed Implementation
[0019] The present invention will be described in detail with reference to the accompanying drawings.
[0020] A method for determining the load-bearing capacity of deck piping supports on an oil tanker, taking the calculation of the load-bearing capacity of a certain type of deck piping support on a 110,000-ton oil tanker as an example, such as... Figure 1 As shown, a deck piping support structure of a certain type is known for a 110,000 tonne oil tanker. The support structure includes horizontally arranged support beams and support columns below the support beams. The support beams are made of H-beams, and the support columns are made of round steel. The load application point of the support (i.e., the contact point between the support beams and the support columns) is as follows: Figure 2 As shown.
[0021] S1: Establish standardized input for the pipe system support structure. Based on the general structural statics finite element analysis theory, the pipe system support structure can be simplified to a beam system model. Standardized input data is then compiled, consisting of five parts: 1) Definition of material properties: Based on known deck piping support structure diagrams, such as... Figure 1As shown, the input parameters for the material properties required for finite element analysis are obtained. The definitions of the material properties in this example are shown in the table below: Material properties H-beams round steel Elastic modulus E 2.10E+11 2.10E+11 Shear modulus G 8.08E+10 8.08E+10 Cross-sectional area A 0.006208 0.005007 Density 7850 7850 Effective shear area of the cross section perpendicular to the strong axis (KONE) 0.001438 0.002519 Effective shear area KTWO perpendicular to the weak axis 0.003164 0.002519 Section height d / outer diameter of round steel d 0.2 0.14 Web thickness tw / round steel thickness tw 0.008 0.0125 Material yield strength Fy 2.35E+08 2.35E+08 Panel half width bf 0.1 \ Panel thickness tf 0.012 \ Moment of inertia Ix of a cross section about its own axis 3.39E-07 2.05E-05 Moment of inertia Iy of the cross section about the strong axis 4.61E-05 1.03E-05 Moment of inertia Iz of the cross section about the weak axis 1.60E-05 1.03E-05 The static moment Sy of the section about the strong neutral axis 0.000257 \ The static moment Sz of the cross section about the weak neutral axis 1.21E-04 \ The section panel is furthest from the neutral axis by y 0.1 \ z, the distance from the highest point of the cross-section panel to the neutral axis 0.1 \ Section type (1 represents H-beam, 2 represents round steel) 1 2 .
[0022] 2) Definition of a node: The intersection of support beam 1 and support column 2 (e.g., Figure 2 The circles on the central support beam are the intersection points, and the three types of points—the endpoints and the points where the support loads are applied—are all designated as nodes, resulting in a simplified beam system model for finite element analysis. Figure 3 First, take any node in the beam system model diagram as the origin and define a Cartesian coordinate system. Then, based on the relative positions of all nodes in the beam system model diagram with the origin, determine the x, y, and z coordinates of all nodes and number them. The node definitions in this example are shown in the table below: Node number x y z 0 0 0 0 1 0 0.201 0 2 0 1.278 0 3 0 1.641 0 4 0 0.201 -0.958 5 0 1.278 -0.958 6 0 0.593 0 7 0 0.988 0 .
[0023] 3) Definition of a unit: such as Figure 3 The connection relationships between the nodes are shown to determine the required beam elements. The node numbers and material properties at both ends of the element are determined. The mesh size can be any even number greater than or equal to 2. The element definition in this example is shown in the table below: .
[0024] 4) Definition of Constraints: The nodes connecting the pipe system supports to the deck are designated as constraint nodes. Based on the node definition in 2), the corresponding node numbers are defined as constraint node numbers. The constraint definitions in this example are shown in the table below: .
[0025] 5) Definition of support load: Based on the beam system model diagram and the node definition in 2), the corresponding node numbers are defined as the loading points of the support load. The load type of the loading point is determined according to the type of load transmitted by the pipes supported by the pipe system support (i.e., the type of load the engineer wants the pipe system support to withstand). The initial value of the corresponding load type is set to 0.01. The definition of the support load in this example is shown in the table below: .
[0026] By establishing the standardized input of the above-mentioned pipe support structure, and inputting it into any structural finite element analysis software, a finite element analysis can be performed to obtain the stress results of the beam model of the pipe support.
[0027] To facilitate iteration, this example uses Python and is based on finite element analysis theory to programmatically solve the problem. It achieves a finite element analysis based on standardized input to obtain the stress results of a beam model of a pipe support system.
[0028] S2: Calculation of ultimate bearing capacity based on iterative algorithm.
[0029] Using Python, the utilization factor (UC value) of the beam model of the pipe support is calculated based on the stress results of the beam model and the steel structure design section (Section 3 - Structural Steel Design) in the API standard. If the UC value is <= 1, the strength of the pipe support is sufficient, while if the UC value is > 1, the strength of the pipe support is insufficient.
[0030] For a single loading point and a single load type, set the initial value and iteration step size for iteration until UC>1, at which point the iteration ends. Take the loading value of the previous step where UC<1 as the ultimate bearing capacity of the single loading point and the single load type, and define it as the upper and lower limits of the value.
[0031] Based on the definition of the support load in the standardized input of step 1, this example has 4 load types and calculates the ultimate bearing capacity in 8 iterations, including: For the load point 6 of the stent load, Fy is iterated with an initial value of 0.01N and an iteration step size of 100N until UC>1, at which point the iteration ends. The iteration value of the previous step is recorded, which is the upper limit of the load type of Fy at the load point 6 of the stent load.
[0032] For the load point 6 of the support load, Fy is iterated with an initial value of 0.01N and an iteration step size of -100N until UC>1, at which point the iteration ends. The iteration value of the previous step is recorded, which is the lower limit of the load type of Fy at the load point 6 of the support load.
[0033] For the load point 6 of the support load, Fz is iterated with an initial value of 0.01N and an iteration step size of 100N until UC>1, at which point the iteration ends. The iteration value of the previous step is recorded, which is the upper limit of the load type of Fz at the load point 6 of the support load.
[0034] For the load point 6 of the support load, Fz is iterated with an initial value of 0.01N and an iteration step size of -100N until UC>1, at which point the iteration ends. The iteration value of the previous step is recorded, which is the lower limit of the load type of the load point 6 of the support load.
[0035] The above four iterations were also performed on the load point 7 of the support.
[0036] Finally, the ultimate bearing capacity of a single loading point and a single type of load is obtained, i.e., the upper and lower limits of the value:
[0037] Through the above calculation of ultimate bearing capacity based on iterative algorithm, the ultimate bearing capacity of pipe system support under a single loading point and a single load type is initially obtained. The upper and lower limits of the values that the pipe system support can withstand under a single loading point and a single load type are given, and the range of values is clarified, which prepares for the establishment of a combined working condition bearing capacity table in step S3.
[0038] S3: Establish a table of combined load-bearing capacity. Based on the ultimate bearing capacity of a single loading point and a single load type, insert an arbitrary number of intermediate value points at equal intervals within the upper and lower limits. In this example, three intermediate value points are inserted, resulting in a total of five value points, including the upper and lower limits. .
[0039] Since step S2 determines the ultimate bearing capacity of a single loading point and a single load type, but for combined load cases with multiple loading points and multiple load types, there may be cases where UC > 1, it is necessary to iterate through all combinations of value points to obtain all combined load cases. Finite element analysis is then used to calculate the UC value for each combined load case, and all combined load cases with UC < 1 are saved to obtain the final table of combined load capacity for pipe system supports. In this example, there are 4 load types, and each load type has 5 value points. Therefore, it is necessary to iterate through 5 × 5 × 5 × 5 = 625 combined load cases. Finally, 231 combined load cases satisfying UC < 1 are selected. Some of these combined load cases satisfying UC < 1 are listed below: .
[0040] The above-described combined load-bearing capacity table was established. This resulted in multiple loading points and load types for a specific type of deck piping support on an 110,000 tonne oil tanker, satisfying UC < 1. The data in the combined load-bearing capacity table represents the ultimate load-bearing capacity of the piping support. Engineers compared the load data from pipe stress analysis with the values in the load-bearing capacity table. If the load data was less than the values in the table, then this type of piping support could be selected due to sufficient strength.
[0041] This invention performs calculations on various types of pipe system supports, generating corresponding load-bearing capacity tables. For any support load input obtained from pipe stress analysis, rapid support selection can be achieved by referring to tables. This breaks the dependence on pipe stress analysis load input, enabling rapid support selection and adaptability adjustments, thus improving the efficiency and flexibility of oil tanker deck piping system design.
Claims
1. A method for determining the load-bearing capacity of a deck piping support for an oil tanker, characterized in that, The specific steps are as follows: S1: Establish standardized input for the pipe system support structure, including the definition of material properties, nodes, elements, constraints, and support loads. By inputting the standardized input of the above pipe system support structure into any structural finite element analysis software, a finite element analysis can be performed to obtain the stress results of a beam model of the pipe system support. S2: Calculation of ultimate bearing capacity based on iterative algorithm; For a single loading point and a single load type, set the initial value and iteration step size, and complete the strength check using finite element analysis. The strength check adopts the API specification. Calculate the utilization coefficient UC value of the beam element until UC>1, and the iteration ends. Obtain the ultimate bearing capacity of a single loading point and a single load type, which is defined as the upper and lower limits of the value. S3: Establish a table of combined working conditions bearing capacity; based on the ultimate bearing capacity of a single loading point and a single load type, insert any number of intermediate value points n at equal intervals within the range of upper and lower limits, to obtain a total of n+2 value points including the upper and lower limits. For multiple loading points and multiple load types, all combinations are traversed to obtain combined working conditions. Finite element analysis is used to calculate the UC value of each combined working condition. All combined working conditions with UC < 1 are saved to obtain the final table of bearing capacity of combined working conditions of pipe system support. Based on the load data given by the pipe stress analysis, compare it with the values in the bearing capacity table. If the load data is less than the values in the bearing capacity table, this type of pipe support can be selected, and the strength is sufficient.
2. The method for determining the load-bearing capacity of a tanker deck piping support according to claim 1, characterized in that, Standardized inputs include: definitions of material properties, nodes, elements, constraints, and support loads.
3. The method for determining the load-bearing capacity of a tanker deck piping support according to claim 1, characterized in that, If the UC value is less than or equal to 1, the pipe support strength is sufficient; if the UC value is greater than 1, the pipe support strength is insufficient.
4. The method for determining the load-bearing capacity of a tanker deck piping support according to claim 1, characterized in that, In step S2, the utilization factor UC of the beam model of the pipe support is calculated based on the stress results of the beam model of the pipe support and the steel structure design section (Section 3 - Structural Steel Design) in the API standard.
5. The method for determining the load-bearing capacity of a tanker deck piping support according to claim 1, characterized in that, In step S2, the initial value for the iteration is 0.01N.
6. The method for determining the load-bearing capacity of a tanker deck piping support according to claim 1, characterized in that, In step S2, the iteration step size is 100N or -100N.
7. The method for determining the load-bearing capacity of a tanker deck piping support according to claim 2, characterized in that, The definition of support load includes the loading point and the type of load.
8. The method for determining the load-bearing capacity of a tanker deck piping support according to claim 1, characterized in that, The pipe support structure includes horizontally arranged support beams and support columns below the support beams. The support beams are made of H-beams, and the support columns are made of round steel.