Diagnostic methods, systems, and programs

Abstract

This diagnostic method includes the steps of: measuring the surface pressure range with the gasket using three-dimensional point cloud data of the flange surface; comparing the surface pressure range before and after deterioration to calculate one or more of the surface pressure reduction amount, surface pressure reduction width, surface pressure reduction rate, or surface pressure reduction rate; selecting one or more of the repair details, repair timing, or repair costs from a database that stores one or more of the repair details, repair timing, or repair costs of the flange related to one or more of the surface pressure reduction amount, surface pressure reduction width, surface pressure reduction rate, or surface pressure reduction rate, and presenting a diagnostic result that includes one or more of the repair details, repair timing, or repair costs. As a result, maintenance information including one or more of the repair details, repair timing, or repair costs is presented by quantifying each surface pressure range before and after deterioration.

Description

【Technical Field】 【0001】 The present disclosure relates to a flange fastener for sealing between pipelines through which a fluid or the like flows, a diagnostic method, system, and program for diagnosing a flange. 【Background Art】 【0002】 Conventionally, regarding the aging deterioration of a flange fastener, according to Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2024-44482), it is disclosed that three-dimensional shape data is acquired from a flange surface, and based on flaw detection or strain measurement in an evaluation target region, a determination is made as to whether repair of the flange surface is necessary. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2024-44482 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 By the way, regarding the flange of a flange fastener, its maintenance needs to be carried out before an unexpected situation such as fluid leakage occurs. However, if a sudden leakage occurs, there are cases where the operation of the equipment is stopped before regular maintenance and measures are taken to deal with the problem. The causes of leakage are diverse, and it is difficult to pursue and identify the cause of leakage. In some cases, the flange is repaired in advance due to aging time or leakage history. Moreover, the determination of whether the flange surface is abnormal is qualitative, and there is a problem that planned maintenance is not carried out in order to prioritize emergency treatment. 【0005】 The flanges of flange fasteners can develop irregularities due to overtightening or uneven tightening during installation, deterioration over time, resulting in distortion, tilting, deposits due to insufficient cleaning, and scratches from improper gasket removal. Even if the sealing function is temporarily restored by replacing the gasket or adjusting the tightening on a deteriorated flange surface, the gasket will be compressed unevenly in a flange that has already deteriorated due to distortion, and in addition to the creep of the gasket itself, it will not be able to keep up with the thermal expansion and contraction of the fastener, which may cause fluid leakage. 【0006】 Traditionally, flange fastener maintenance involves visually inspecting and palpating the deterioration of the flange surface. Determining whether this condition will lead to fluid leakage depends on the worker's technical knowledge and experience. Flange fastener maintenance typically involves multiple tasks, including gasket replacement, flange surface polishing, machining, axial force adjustment, and flange fastener replacement, all of which must be considered in terms of repair time and cost. Therefore, even highly knowledgeable and experienced workers find this judgment difficult, and the variability in these judgments cannot be ignored. 【0007】 The inventors of this disclosure have found that, for example, in the diagnosis of flange deterioration, deterioration of the flange, such as scratches and distortions on the flange surface, appears in the surface pressure range with the gasket, and that it is reasonable to select the repair of the flange and the timing of the repair according to this surface pressure range. 【0008】 Therefore, in light of the above issues, the purpose of this disclosure is to present maintenance information including repair details, repair timing, or repair costs, or one or more of these, by quantifying the surface pressure range before and after deterioration. [Means for solving the problem] 【0009】 To achieve the above objective, according to one aspect of the diagnostic method of this disclosure, a diagnostic method for diagnosing the flange of a flange fastening body, The surface pressure range measurement unit is A process to measure the surface pressure range with the gasket using three-dimensional point cloud data of the flange surface, The diagnostic department,A step of comparing the surface pressure range before and after deterioration and calculating one or more of the surface pressure reduction amount, surface pressure reduction width, surface pressure reduction rate, or surface pressure reduction rate, The aforementioned diagnostic unit, A step of selecting from a database storing repair details, repair timing, or repair costs of a flange related to any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, the repair details, repair timing, or repair costs that are specified by any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, the repair details, repair timing, or repair costs that are specified by any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, The presentation section, The process includes a step of presenting a diagnostic result that includes one or more of the repair details, the repair timing, or the repair costs. 【0010】 In this diagnostic method, The aforementioned diagnostic unit, A step of measuring the radial surface pressure width of the flange surface from the aforementioned surface pressure range, The aforementioned diagnostic unit, The process may also include a step of comparing the surface pressure width before and after deterioration and calculating the reduction in surface pressure. 【0011】 In this diagnostic method, further, The aforementioned diagnostic unit, A step of measuring the surface pressure width at at least one location in the surface pressure range before deterioration and at least two locations in the radial direction of the surface pressure range after deterioration, The aforementioned diagnostic unit, The process may also include a step of comparing the surface pressure width before and after deterioration and calculating the reduction in surface pressure. 【0012】 In this diagnostic method, the repair work may include any or more of the following: adjustment of the flange surface in relation to the reduction in surface pressure, resetting of the tightening axial force, or replacement of the flange. 【0013】 In this diagnostic method, further, The aforementioned diagnostic unit The process includes a cost calculation step for determining the aforementioned repair costs, and this cost calculation step may include calculating the costs necessary for resetting the clamping axial force, increasing or decreasing the clamping axial force, adjusting the flange surface, or replacing the flange. 【0014】 To achieve the above objective, according to one aspect of the diagnostic system of this disclosure, a diagnostic system for diagnosing the flange of a flange fastening body includes: a surface pressure range measuring unit that measures the surface pressure range with a gasket from three-dimensional point cloud data of the flange surface; a diagnostic unit that compares the surface pressure range before and after deterioration to calculate the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, and selects from a database storing any or more of the repair details, repair timing, or repair costs of the flange related to any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, any or more of the repair details, repair timing, or repair costs of the flange, which are specified by any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, any or more of the repair details, repair timing, or repair costs; and a presentation unit that presents a diagnostic result including any or more of the repair details, repair timing, or repair costs. 【0015】 To achieve the above objective, according to one aspect of the program of this disclosure, a program to be executed by a computer includes the following functions: a function to measure the surface pressure range with respect to a gasket from three-dimensional point cloud data of a flange surface; a function to calculate the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction by comparing the surface pressure range before and after deterioration; a function to select from a database storing any or more of the repair details, repair timing, or repair costs of a flange related to any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, any or more of the repair details, repair timing, or repair costs of a flange, and a function to output presentation information representing a diagnostic result including any or more of the repair details, repair timing, or repair costs. [Effects of the Invention] 【0016】 According to this disclosure, one of the following effects can be obtained: (1) It is possible to select any one or two or more of the repair content, repair time, or repair cost according to the deterioration state of the flange surface of the flange, which can facilitate maintenance and improve maintenance accuracy. 【0017】 (2) Regarding the maintenance of the flange fastener and the flange, a repair plan can be made according to the deterioration state of the flange surface without depending on the technical knowledge and experience of the operator. 【0018】 Other objects, features, and advantages of the present disclosure will become clearer by referring to the accompanying drawings and each embodiment. 【Brief Description of the Drawings】 【0019】 [Figure 1] A in FIG. 1 is a perspective view showing a flange fastener as an example of a diagnostic target, and B in FIG. 1 is a perspective view showing the flange of the flange fastener. [Figure 2] A in FIG. 2 is a perspective view showing an example of a diagnostic method and a diagnostic system according to the first embodiment, and B in FIG. 2 is a block diagram showing an example of the hardware of the diagnostic system. [Figure 3] FIG. 3 is a flowchart showing an example of the diagnostic processing procedure according to the first embodiment. [Figure 4] FIG. 4 is a diagram showing an example of the first database. [Figure 5] FIG. 5 is a diagram showing an example of the second database storing the diagnostic results. [Figure 6] A in FIG. 6 is a cross-sectional view showing the longitudinal section of the flange before deterioration, and B in FIG. 6 is a plan view showing the flange surface before deterioration. [Figure 7] A in FIG. 7 is a cross-sectional view showing the longitudinal section of the flange after deterioration, and B in FIG. 7 is a view showing the flange surface after deterioration. [Figure 8] FIG. 8 is a flowchart showing the diagnostic processing procedure. [Figure 9]Figure 9A shows the relationship between the surface pressure range of the flange surface and repair, and Figure 9B shows the relationship between the reduction in surface pressure and repair costs. [Figure 10] Figure 10 is a flowchart showing an example of a diagnostic processing procedure according to the second embodiment. [Figure 11] Figure 11A is a plan view showing the flange surface before deterioration, and Figure 11B is a plan view showing the flange surface after deterioration. [Figure 12] Figure 12A shows the surface pressure width of section aa in Figure 11A, Figure 12B shows the surface pressure width of section b1-b1 in Figure 11B, and Figure 12C shows the surface pressure width of section b2-b2 in Figure 11B. [Figure 13] Figure 13 is a flowchart showing an example of the diagnostic processing procedure according to the third embodiment. [Figure 14] Figure 14 is a flowchart showing an example of the diagnostic processing procedure according to the fourth embodiment. [Figure 15] Figure 15 is a flowchart showing the processing procedure for adjusting the tightening axial force according to Example 1. [Figure 16] Figure 16 is a flowchart showing the processing procedure for diagnosing deterioration of the flange surface according to Example 2. [Figure 17] Figure 17A shows a life prediction system according to the fifth embodiment, and Figure 17B is an enlarged view of part 17B of Figure 17A. [Figure 18] Figure 18 is a flowchart showing the processing steps for life prediction. [Figure 19] Figure 19 shows the trend chart T-11. [Figure 20] Figure 20 is a graph showing flange strain in the radial direction of the flange. [Figure 21] Figure 21 is a graph showing the flange strain in the circumferential direction of the flange. [Figure 22] Figure 22 is a diagram illustrating the method for calculating the apparent length of a wound. [Figure 23] Figure 23 shows an example of the criteria for determining whether a flange is good or bad. [Figure 24] Figure 24A is a diagram for determining the area of ​​damage, and Figure 24B is a table showing the criteria for judgment based on the percentage of the area of ​​damage, etc. [Figure 25] Figure 25 shows a diagram of the damage. [Figure 26] Figure 26 shows a diagram of the damage. [Figure 27] Figure 27 is a diagram illustrating the integration of wounds. [Figure 28] Figure 28 is a cross-sectional view showing the shape of the flange. [Figure 29] Figure 29 shows the trend chart T-12. [Figure 30] Figure 30 shows the trend chart T-21. [Figure 31] Figure 31 shows the trend chart T-22. [Modes for carrying out the invention] 【0020】 [Target for diagnosis] Figure 1A shows a flange fastener, which is an example of a diagnostic target of this disclosure, and Figure 1B shows the flange of the flange fastener. 【0021】 The flange fastener 2 is used, for example, at the connection point between pipelines in a plant and functions as a sealing part that seals the pipelines. In this flange fastener 2, flange 6-1 is welded to the end of the upper pipeline 4-1, and flange 6-2 is welded to the end of the lower pipeline 4-2, with a gasket 8 installed between flanges 6-1 and 6-2. The gasket 8 is an example of a sealing material that seals between flanges 6-1 and 6-2. Flanges 6-1 and 6-2 are connected by multiple bolts 10 and nuts 12 that pass through bolt through holes 20, and the tightening axial force F of each bolt 10 functions as the sealing surface pressure between flanges 6-1 and 6-2 and the gasket 8. Therefore, this flange fastener 2 can prevent leakage of fluid 14 passing through the flange fastener 2 between pipelines 4-1 and 4-2. 【0022】 As the fluid 14 passes through, the flange fastener 2 is subjected to multiple loads such as pressure, heat, and vibration, and also deteriorates over time due to overtightening or uneven tightening during installation. This deterioration manifests as distortion, unevenness, tilting of the flanges 6-1 and 6-2 and the flange surface 16, and deformation of the gasket 8. Furthermore, the deterioration of the flange surface 16 reduces the surface pressure range, which is the sealing range between the flange surface 16 and the gasket 8. 【0023】 The diagnostic method, system, and program described herein are used for diagnosing flanges during periodic or irregular maintenance of flange fasteners 2. This diagnosis can utilize empirical values, experimental values, or estimated values, including measured values ​​such as the surface pressure range before and after flange deterioration, the details of flange repairs obtained during maintenance, the timing of repairs, and the repair costs. The surface pressure range before flange deterioration serves as a comparison point for determining the amount and width of surface pressure reduction in the surface pressure range after deterioration. It may be a reference surface pressure range, or the surface pressure range after repair may be used. 【0024】 Therefore, the diagnostic process in this disclosure includes: (1) Compare the surface pressure range before and after deterioration to calculate one or more of the surface pressure reduction amount, surface pressure reduction width, surface pressure reduction rate, or surface pressure reduction rate, and select the repair content specified by one or more of the surface pressure reduction amount, surface pressure reduction width, surface pressure reduction rate, or surface pressure reduction rate. (2) Calculation of the reduction in surface pressure based on the surface pressure width of the surface pressure range before and after deterioration. (3) Cost calculation related to the repair work This includes a wide range of functions and information processing. 【0025】 [First Embodiment] Figure 2A shows a diagnostic method and diagnostic system according to the first embodiment. During maintenance of the flange fastener 2, the bolts 10 are removed to separate the flange fastener 2 into flanges 6-1, 6-2 and gasket 8. A diagnostic system 18 then acquires three-dimensional point cloud data representing the flange surface condition from the flange surfaces 16 of flanges 6-1 and 6-2. The flange surface 16 is primarily the surface on which the gasket 8 is positioned. 【0026】 This diagnostic system 18 includes a 3D (three-dimensional) scanner 22 and a diagnostic device 24. The 3D scanner 22 is an example of a surface pressure range measuring unit of this disclosure. The diagnostic device 24 is an example of a diagnostic unit of this disclosure. 【0027】 The 3D scanner 22 is, for example, a handheld, non-contact 3D scanner that acquires three-dimensional shape data of the flange surface 16 under manual operation by the worker 26. The 3D scanner 22 can be any type capable of acquiring three-dimensional shape data, such as a laser scanner. 【0028】 For the diagnosis of the flange surface 16, the flange surface 16 is positioned with the flange 6-2 facing upwards, and the 3D scanner 22 is placed against the upper surface of the flange 6-2 to acquire three-dimensional point cloud data from the flange surface 16. This three-dimensional point cloud data can be acquired by the diagnostic device 24 via wired or wireless connection. 【0029】 The diagnostic device 24 includes a diagnostic processing unit 28 and an information display unit 30. The diagnostic device 24 may use any information processing device, such as a laptop PC (e.g., a personal computer), a desktop PC, or a tablet terminal. The diagnostic processing unit 28 acquires three-dimensional point cloud data of the flange surface 16 from the 3D scanner 22 and performs diagnostic processing. 【0030】 In this diagnostic device 24, the processing according to the first embodiment includes: (a) Measurement of the surface pressure range with gasket 8 (b) Calculation of the reduction in surface pressure on the flange surface 16 (c) Selection of repair items identified by the amount of surface pressure reduction This includes processes such as those mentioned above. The diagnostic results are presented on the information display unit 30, for example, as image information or text information. 【0031】 <Diagnostic system 18 and diagnostic device 24> Figure 2B shows an example of the diagnostic system 18 and diagnostic device 24 of this disclosure. The diagnostic processing unit 28 includes a processor 32, memory 34, input / output (I / O) unit 36, and the like. 【0032】 The processor 32 is an information processing unit that performs diagnostic and other processing. It executes programs stored in the memory 34 and performs diagnostics (execution of diagnostic programs), processing related items, and controls data acquisition and data recording. 【0033】 Memory 34 is an example of a recording medium that includes ROM (Read-Only Memory) and RAM (Random-Access Memory). The ROM stores the OS (Operating System) as well as a first database (DB) 38 (Figure 4) and a second database (DB) 52 (Figure 5) which store various data, such as the diagnostic program and diagnostic data described herein. RAM is used as a work area for information processing. 【0034】 I / O36 is controlled by the processor 32 and used to acquire three-dimensional point cloud data of the flange surface 16 from the 3D scanner 22 and to output information to the information display unit 30. 【0035】 The diagnostic device 24 may include a communication unit (not shown) and, under the control of the processor 32, send and receive diagnostic data and other information with the server. 【0036】 <Diagnostic Processing Procedure> Figure 3 shows the diagnostic processing procedure according to the first embodiment. In this processing procedure, S represents a process, and the numbers attached to S indicate the order of the processes; however, this disclosure is not limited to this order of processes. 【0037】 This processing procedure includes acquiring three-dimensional point cloud data of the flange surface 16 (S101), measuring the surface pressure range (S102), calculating the amount of surface pressure reduction (S103), acquiring repair information (S104), selecting the repair content (S105), evaluating maintenance including the cumulative repair costs (S106), and presenting the diagnostic results (S107). 【0038】 Acquisition of three-dimensional point cloud data of flange surface 16 (S101): Flanges 6-1 and 6-2 are removed from the flange fastener 2, and three-dimensional point cloud data is acquired from the flange surface 16 of each flange 6-1 and 6-2 using a 3D scanner 22. This three-dimensional point cloud data is a collection of point information in three-dimensional coordinates of X, Y, and Z, and is shape data including distortion, unevenness, and inclination of the flange surface 16. 【0039】 The diagnostic processing unit 28 performs noise reduction, synthesis, and alignment on the three-dimensional point cloud data as a pre-processing step for diagnostic processing, and then creates a 3D model before data conversion. This 3D model creation includes conversion to mesh data. After data conversion of the three-dimensional point cloud data, flange surface information representing the deterioration state of the flange surface 16 is obtained. This flange surface information includes distortion information, unevenness information, and inclination information. 【0040】 Measurement of surface pressure range (S102): The surface pressure range with the gasket 8 is measured from the three-dimensional point cloud data. This surface pressure range measurement is performed for each flange surface 16 before and after deterioration, and the surface pressure range before deterioration is used as reference information for the surface pressure range. This reference information may use reference surface information that represents a flange surface 16 equivalent to the flange surface 16 before deterioration. 【0041】 Calculation of surface pressure reduction (S103): The diagnostic processing unit 28 compares the surface pressure range before deterioration with the surface pressure range after deterioration and calculates the amount of surface pressure reduction in the surface pressure range after deterioration. To calculate this amount of surface pressure reduction, for example, the surface pressure area representing the surface pressure range before deterioration and the surface pressure area representing the surface pressure range after deterioration can be compared, and the reduction in area of ​​the surface pressure range after deterioration can be taken as the amount of surface pressure reduction. For such point cloud data analysis, for example, analysis using the Finite Element Method (FEM) can be used. 【0042】 Acquisition of repair information (S104): The diagnostic processing unit 28 acquires repair information from the first DB 38 (Figure 4) using the surface pressure reduction amount. This repair information includes the repair items, repair time, and cost required for maintenance. The repair items include gasket replacement, polishing, cutting, axial force adjustment, flange fastener replacement, etc., which should be selected according to the surface pressure reduction amount. 【0043】 Gasket replacement involves replacing a deteriorated gasket 8 with, for example, a new gasket 8. Polishing involves polishing the flange surface 16. Machining involves machining the flange surface 16 to the extent possible. Axial force adjustment involves adjusting the tightening axial force of each bolt 10. Flange fastener replacement involves replacing a flange fastener 2 that is irreparable or unsuitable, or generating new design values ​​for a flange fastener 2 that are suitable for the operating environment such as a plant. Gasket replacement may also involve gasket changes, such as changing the dimensions of the gasket or changing the type of gasket. Changing the dimensions of a gasket involves changing at least one or more values ​​of information such as the thickness, inner diameter, outer diameter, and sealing surface width of the gasket. 【0044】 Repair time is time information that represents the time spent on repairs according to the nature of the repair, and the next scheduled maintenance. Repair timing is time information that represents the timing and cycle of repairs that should be carried out in response to the decrease in surface pressure. This time information, such as repair time, is stored in the second DB52 (Figure 5). 【0045】 The cost is the expense required for repairs. Repairs related to the reduction in surface pressure on the flange surface 16 will incur repair costs corresponding to the nature of the repair. This cost information is acquired and stored in the second DB52 (Figure 5). Repair costs incurred at each repair period are accumulated as cumulative repair costs and stored in the second DB52, and the cumulative repair costs are updated each time repair costs are incurred. 【0046】 Selection of repair content (S105): For this selection of repair content, the first DB38 (Figure 4) is used, and items that are suitable for the reduction in surface pressure are selected from repair items, repair time, repair timing, and cost related to the reduction in surface pressure. 【0047】 Maintenance evaluation including cumulative repair costs (S106): The diagnostic processing unit 28 refers to the data stored in the second DB 52 and performs a maintenance evaluation including cumulative repair costs. 【0048】 Presentation of diagnostic results (S107): The various information obtained from the above diagnostic results is generated as presentation information and presented to the information presentation unit 30. 【0049】 <1st DB38> The first DB38 calculates the reduction in surface pressure by comparing the surface pressure ranges of the flange surface 16 before and after deterioration, and uses this reduction in surface pressure to select the repair content. The first DB38 constitutes a data conversion table that converts the reduction in surface pressure into the repair content. Therefore, using the first DB38, it is possible to convert the results into a diagnostic result that represents the repair content specified by the reduction in surface pressure. 【0050】 Figure 4 shows an example of the first DB38. This first DB38 includes a date and time section 40, a flange section 42, a surface pressure range section 44, a repair details section 46, a repair time section 48, a cost section 50, and so on. 【0051】 The date and time section 40 stores date and time information at the time of diagnosis. The flange section 42 stores identification information that identifies the flanges 6-1 and 6-2 that are the subject of the diagnosis. 【0052】 The surface pressure range section 44 includes a deteriorated front surface pressure range section 44-1, a deteriorated post-deterioration surface pressure range section 44-2, and a surface pressure reduction amount section 44-3. The deteriorated front surface pressure range section 44-1 stores range information representing the surface pressure range before deterioration. This surface pressure range information is reference information for calculating the amount of surface pressure reduction in the surface pressure range after deterioration, and for example, it stores area information representing the surface pressure range. 【0053】 The deteriorated surface pressure range section 44-2 stores range information representing the surface pressure range of the deteriorated flanges 6-1 and 6-2, for example, area information representing the surface pressure range. 【0054】 The surface pressure reduction section 44-3 stores the amount of surface pressure reduction in the deteriorated surface pressure range, which is calculated by comparing the deteriorated front surface pressure range in the deteriorated front surface pressure range section 44-1 with the deteriorated surface pressure range in the deteriorated surface pressure range section 44-2. 【0055】 The repair details section 46 includes a gasket replacement section 46-1, a polishing section 46-2, a cutting section 46-3, an axial force adjustment section 46-4, and a flange fastener replacement section 46-5, which represent diagnostic information identified by the amount of surface pressure reduction. 【0056】 The gasket replacement section 46-1 stores replacement information indicating the replacement of gasket 8. This replacement information is the result of a diagnosis based on the amount of surface pressure reduction. 【0057】 The polishing section 46-2 stores polishing information representing the polishing content of the flange surface 16, which is selected based on the amount of surface pressure reduction. The polishing content is selected based on the amount of surface pressure reduction, and the degree of polishing is specified according to the amount of surface pressure reduction. 【0058】 The cutting section 46-3 stores cutting information such as the cutting depth of the flange surface 16, which is determined by the amount of surface pressure reduction, and the cutting limit. The cutting content is selected based on the amount of surface pressure reduction, and the degree of cutting is determined according to the amount of surface pressure reduction. 【0059】 The axial force adjustment unit 46-4 stores axial force increase / decrease information that represents the increase or decrease in the tightening axial force of each bolt 10, which is specified by the amount of surface pressure reduction. In this case, it stores adjustment information that is related to the inclination information of flanges 6-1 and 6-2, which is specified by the amount of surface pressure reduction, and represents the increase or decrease in tightening axial force according to the position of the bolt 10, which is related to the inclination. The content of the axial force increase or decrease is selected by the amount of surface pressure reduction, the increase or decrease in axial force and its position are specified according to the amount of surface pressure reduction, and the amount of the axial force increase or decrease is specified by the amount of surface pressure reduction. 【0060】 The flange fastener replacement section 46-5 stores information on the replacement of the flange fastener 2 and its design values. Depending on the amount of surface pressure reduction, it may not be possible to address the issue by replacing the gasket 8, grinding or cutting the flange surface 16, or adjusting the tightening axial force of each bolt 10. In this case, replacement information for the flange fastener is provided. The replacement of the flange fastener 2 is selected according to the amount of surface pressure reduction. 【0061】 The repair time section 48 stores time information representing the time required to carry out the repair work. The cost section 50 stores cost information representing the cost required in relation to the repair work. The repair time is determined by the amount of surface pressure reduction. 【0062】 Therefore, according to this first DB38, the amount of surface pressure reduction can be calculated by comparing the surface pressure range of the flange surface 16 before and after deterioration, and one or more diagnostic results of the repair content, repair timing, or repair cost specified by this amount of surface pressure reduction can be selected. 【0063】 <2nd DB52> The diagnostic results of the flange surfaces 16 of flanges 6-1 and 6-2 are stored in the second DB52. Figure 5 shows an example of the second DB52. 【0064】 This second DB52 includes a date and time section 54, an equipment / plant information section 56, a design information section 58, an operation information section 60, a flange fastening section 62, a surface pressure range section 64, a diagnostic results section 66, and an overall evaluation section 68. 【0065】 The date and time section 54 stores time information indicating the date and time of maintenance performed regularly or irregularly. This date and time is used as reference time information for elapsed time and repair timing. 【0066】 The equipment / plant information unit 56 is configured with equipment information unit 56-1 and plant information unit 56-2. Equipment information unit 56-1 stores ID information to identify the equipment on which the flange fastener 2 is installed, and plant information unit 56-2 stores ID information to identify the plant. 【0067】 The design information unit 58 is configured with a design temperature unit 58-1 and a design pressure unit 58-2. The design temperature unit 58-1 stores temperature information representing the design temperature of the flange fastener 2, and the design pressure unit 58-2 stores pressure information representing the design pressure of the flange fastener 2. 【0068】 The operation information unit 60 is configured with an operating temperature unit 60-1, an operating pressure unit 60-2, and a fluid information unit 60-3. The operating temperature unit 60-1 stores temperature information representing the operating temperature of the equipment, the operating pressure unit 60-2 stores pressure information representing the operating pressure of the equipment, and the fluid information unit 60-3 stores information for identifying the fluid, such as the type and composition of the fluid. 【0069】 The flange fastening section 62 includes a pipeline information section 62-1, a flange section 62-2, a seal information section 62-3, and a tightening axial force section 62-4. The pipeline information section 62-1 stores information to identify pipelines 4-1 and 4-2 of the flange fastening section 2, such as the hub thickness and material. The flange section 62-2 stores flange information to identify flanges 6-1 and 6-2, such as the flange thickness and material. The seal information section 62-3 stores seal information to identify the seal contents. The tightening axial force section 62-4 stores the tightening axial force of each bolt 10 that fastens flanges 6-1 and 6-2, along with the position information of the bolts 10. 【0070】 The surface pressure range section 64 includes a deteriorated front surface pressure range section 64-1, a deteriorated post-surface pressure range section 64-2, and a surface pressure reduction amount section 64-3. The deteriorated front surface pressure range section 64-1 stores range information representing the deteriorated front surface pressure range. The deteriorated post-surface pressure range section 64-2 stores range information representing the deteriorated post-surface pressure range. The surface pressure reduction amount section 64-3 stores information representing the reduction amount of the surface pressure range. 【0071】 The diagnostic result unit 66 is configured with a repair unit 66-1 and a cost unit 66-2, and stores repair details and cost details that represent the results of the diagnosis. The repair unit 66-1 is configured with repair details 66-11, repair feasibility unit 66-12, and repair time unit 66-13. Repair details 66-11 stores repair information that represents the repair details, which are specified by the amount of reduction in the surface pressure range of the flange fastener 2. Repair feasibility unit 66-12 stores feasibility information and record information that represent whether the repair is feasible or not, which is specified from the repair details. Repair time unit 66-13 stores time information that represents the time required for the repair. 【0072】 The cost section 66-2 includes a repair cost section 66-21, a cumulative repair cost section 66-22, a repair cost threshold section 66-23, and a repair feasibility section 66-24. The repair cost section 66-21 stores cost information representing the costs specified in the repair information. The cumulative repair cost section 66-22 stores cumulative information representing the cumulative repair costs of regularly or irregularly performed repairs. This cumulative value is updated with the costs incurred for each repair. The repair cost threshold section 66-23 stores cost threshold information representing the marginal cost specified for the flange fastener 2. The repair feasibility section 66-24 stores feasibility information indicating whether repairs are feasible from a cost perspective. 【0073】 The overall evaluation unit 68 stores evaluation information representing the overall evaluation of the flange fastener 2, as well as information on how to display it. This information is displayed to the information display unit 30 as appropriate. 【0074】 <Measurement of surface pressure range and calculation of surface pressure reduction for flanges 6-1 and 6-2> Figure 6A shows a longitudinal section of flanges 6-1 and 6-2 (flanges in an ideal state) before deterioration. In Figure 6A, the same parts as in Figures 1A and 1B are denoted by the same reference numerals. Flange 6-1 is connected to the end side circumferential surface of pipe 4-1, and flange 6-2 is connected to the end side circumferential surface of pipe 4-2 by welds 70 and 72. The flange surfaces 16 of flanges 6-1 and 6-2 are maintained parallel, and a gasket 8 is installed between these flange surfaces 16. For the sake of ease of explanation, a gap is shown between the flange surfaces 16 of flanges 6-1 and 6-2, but when configured as a flange fastening body 2, it is fixed in close contact with the gasket 8 by the tightening axial force of the bolts 10 described above. In each flange 6-1 and 6-2, the flange surface 16 before deterioration constitutes an ideal flat surface. 【0075】 Figure 6B shows the flange surfaces 16 of flanges 6-1 and 6-2 before deterioration. If Sref is the surface pressure area of ​​the surface pressure range 74 of each flange surface 16, then the surface pressure area Sref is formed by annular portions of the same width corresponding to the gasket 8. This surface pressure area Sref indicates the surface pressure range 74 of the gasket 8 that provides the sealing function. 【0076】 Figure 7A shows a longitudinal section of the flange after deterioration. On the flange surface 16 of flange 6-1, irregularities 76-1 representing flange distortion in the deteriorated state are formed, and on the flange surface 16 of flange 6-2, irregularities 76-2 representing flange distortion in the deteriorated state are formed. In other words, due to the distortion, the surface pressure range 74 of the irregularities 76-1 and 76-2 has changed to the surface pressure range 74-1 and 74-2 after deterioration, and is in a more compressed state than before deterioration, resulting in a decrease in the surface pressure range 74 before deterioration. 【0077】 Figure 7B shows the surface pressure ranges 74-1 and 74-2 of flanges 6-1 and 6-2 after deterioration. Let S1 be the area of ​​surface pressure range 74-1 and S2 be the area of ​​surface pressure range 74-2. The surface pressure area Sref of surface pressure range 74 before deterioration is divided into the area S1 on the smaller diameter side and the area S2 on the larger diameter side as a result of the formation of irregularities 76-1 and 76-2, and the surface pressure range 74 of the flange surface 16 is reduced to surface pressure ranges 74-1 and 74-2. 【0078】 If the surface pressure area after degradation is denoted as Sd, then the surface pressure area Sd can be expressed by equation (1). Sd = S1 + S2 ... (1) 【0079】 By comparing the surface pressure areas Sref and Sd before and after degradation, and defining the decrease in surface pressure area Sref as the surface pressure reduction ΔS, this surface pressure reduction ΔS can be expressed by equation (2). ΔS = Sref - Sd ... (2) 【0080】 If the decrease in surface pressure ΔS increases due to deterioration of the flange surface 16, the risk of fluid leakage from the flange fastener 2 increases. 【0081】 <Repair scope of flange surface 16> Regarding the repair range of the flange surface 16, the amount of material removed from the flange surface 16 can be managed as follows. If the machinable range of the flange surface 16 is Qm, the amount of material removed in one repair is q1, q2, q3, ..., and the sum of the amounts of material removed is qn, then the sum of the amounts of material removed can be expressed by equation (3). qn = q1 + q2 + q3 + ... ... (3) 【0082】 The cumulative cutting amount value qn increases in proportion to the number of cutting operations and is expected to exceed the machinable range Qm. Therefore, it is necessary to monitor the cutting of the flange surface 16 to ensure that the cumulative cutting amount value qn does not exceed the machinable range Qm. 【0083】 The diagnostic device 24 acquires cutting information representing the cutting amounts q1, q2, q3, ..., and updates the cutting amount sum qn for each cut. Then, it permits cutting within the range where the cutting amount sum qn satisfies equation (4). qn ≤ Qm ···(4) 【0084】 In this case, even if the added cutting amount qn is within the machinable range Qm, if the addition of the normal cutting amount qi is expected to exceed the machinable range Qm, prohibition information is generated to prohibit cutting and presented to the information display unit 30. 【0085】 <Repair costs> Regarding the repair costs of the flange surface 16, the repair costs of the flange surface 16 can be managed as follows, for example. If Mlim is the marginal cost for repairing the flange surface 16, mi is the repair cost at each repair time (i=1, 2, 3, ...), and Mi is the cumulative repair cost (i=1, 2, 3, ...), then for example, if three repairs are performed, the cumulative repair cost Mi at each repair time can be expressed by equations (5), (6), and (7). 【0086】 m1 = M1 ... (5) M1 + m2 = M2 ... (6) M2 + m3 = M3 ... (7) 【0087】 Since the cumulative repair cost Mi increases cumulatively in proportion to the number of cutting operations, it should be monitored to ensure that it does not exceed the marginal cost Mlim. 【0088】 The diagnostic device 24 acquires repair cost information each time a repair is performed and updates the cumulative repair cost Mi. Then, it authorizes the repair as long as the cumulative repair cost Mi satisfies equation (8). Mi≦Mlim ···(8) 【0089】 In this case, even if the cumulative repair cost Mi is less than or equal to the marginal cost Mlim, if it is expected that the next repair will exceed the marginal cost Mlim, prohibition information is generated and presented to the information presentation unit 30 indicating that the repair should be prohibited. 【0090】 <Diagnostic Processing Procedure> Figure 8 shows the flange diagnostic process. This process is a more specific and detailed version of steps S101 to S106 in Figure 3. 【0091】 This processing procedure includes acquiring flange information (S201), cleaning the flange surface 16 (S202), acquiring three-dimensional shape data of the flange surface 16 (S203), creating a three-dimensional point cloud of the state information of the flange surface 16 (S204), comparing the three-dimensional point cloud data with reference data (S205), acquiring surface pressure area data (S206), calculating the amount of surface pressure reduction (S207), acquiring repair information (S208), and selecting the repair content (S201). This includes 209), determining the repair details (S210), generating and presenting cutting information (S211), acquiring tightening axial force information (S212), calculating tightening axial force increase / decrease values ​​(S213), calculating repair costs (S214), updating cumulative repair costs (S215), determining cumulative repair costs (S216), presenting a repair plan (S217), and presenting information on replacement of flange fastener 2 / presenting information on design value changes (S218). 【0092】 In this flange diagnostic procedure, the diagnostic device 24 acquires flange information (S201), and this flange information is stored in the first DB 38. This flange information is used to identify the flange fastening body 2. 【0093】 After this computer processing, the flange surface 16 of the flange 6-1 or flange 6-2 to be diagnosed is cleaned manually (S202). This cleaning removes any deposits or other contaminants from the flange surface 16. 【0094】 After cleaning, the 3D scanner 22 is directed towards the flange surface 16 of flange 6-1 or flange 6-2, and three-dimensional shape data is acquired from the flange surface 16 by scanning (S203). 【0095】 The diagnostic device 24 acquires one or more of the topography, topography, or topography represented by the three-dimensional point cloud data under the control of the processor 32, and performs the process of converting this state information into a three-dimensional point cloud (S204). 【0096】 The diagnostic device 24 compares the three-dimensional point cloud data, which is the state information of the flange surface 16, with reference data (S205) and acquires the surface pressure area data of the flange surface 16 (S206). Then, it calculates the amount of surface pressure reduction by comparing the surface pressure area Sref before deterioration with the surface pressure area Sd after deterioration (S207). 【0097】 This surface pressure reduction is used to obtain repair information from the first DB38 (S208). In other words, the surface pressure reduction is converted into repair information as a diagnosis of the flange surface 16. Then, the diagnostic device 24 uses the surface pressure reduction to select the repair content from the diagnostic information (S209). 【0098】 The diagnostic device 24 determines whether the selected repair item falls within the repairable range (S210). If the repair item is, for example, cutting the flange surface 16, it generates and presents the cutting information (S211). The cutting information is displayed on the information presentation unit 30 in relation to the flange information. 【0099】 Furthermore, if the repair involves adjusting the tightening axial force, the diagnostic device 24 acquires tightening axial force information (S212) and calculates the increase or decrease value of the tightening axial force to correct the inclination of the flange surface 16 (S213). 【0100】 Once the repair details are identified, the diagnostic device 24 calculates the repair costs (S214) and updates the cumulative repair costs in the second DB 52 (S215). 【0101】 When the cumulative repair costs are updated, it is determined whether these cumulative repair costs are below the limit value (S216). If the cumulative repair costs are below the limit value (YES in S216), a repair plan is generated, this repair plan is presented to the information presentation unit 30 (S217), and this process ends. 【0102】 Furthermore, if the cumulative repair costs exceed or are likely to exceed the limit (NO in S216), information on replacing flange fastener 2 is generated and presented, or new information on replacing flange fastener 2 or information on changes in design values ​​is presented (S218), and this process is terminated. 【0103】 <Relationship between the surface pressure range of the flange surface 16 and repair> In Fig. 9, A sets the elapsed time t on the horizontal axis and the parameter value on the vertical axis, and shows the relationship between the decrease Fd1 in the surface pressure range of the flange surface 16 and the repairable range Rf. 【0104】 The decrease Fd1 in the surface pressure range increases non-linearly from t = 0 as the elapsed time t progresses, and approaches the damage limit Dmax representing the limit of deterioration. Assuming the optimal repair time is tf, when the elapsed time t reaches the optimal repair time tf (t = tf), for example, the flange surface 16 is cut as the repair content. 【0105】 As a result of cutting the flange surface 16, after the decrease Fd1 in the surface pressure range returns to the initial value, a new decrease Fd2 in the surface pressure range increases non-linearly as the elapsed time t progresses and approaches the damage limit Dmax. 【0106】 From t = 0 to tf, it is the cutable range Rf1, whereas after cutting, after t = tf, it changes to the cutable range Rf2 (<Rf1). That is, as the cutable range Rf2 decreases, the repair range decreases. By storing and managing this decrease amount information, the limit of the repair range such as cutting the flange surface 16 can be recognized. 【0107】 <Relationship between the surface pressure reduction amount and the repair cost> In Fig. 9, B shows the relationship between the elapsed time t on the horizontal axis and the transition of the surface pressure areas Sd1, Sd2 and the repair cost on the vertical axis. 【0108】 The surface pressure area Sd1 decreases non-linearly from t = 0 as the elapsed time t progresses and approaches the surface pressure deterioration limit Smin. As described above, when reaching the optimal repair time tf (t = tf), the flange surface 16 is cut as the repair content related to the surface pressure area Sd1. 【0109】 As a result of cutting the flange surface 16, after the surface pressure area Sd^1 returns to the initial value, a new surface pressure area Sd2 decreases non-linearly as the elapsed time t progresses and approaches the surface pressure deterioration limit Smin. 【0110】 While the cumulative cost is Cf1 from t=0 to tf, it increases to Cf2 (>Cf1) after cutting and at t=tf. In other words, the repair cost increases cumulatively in proportion to the number of repairs, and moreover, the more sophisticated the repair work, such as cutting, becomes. 【0111】 <Effects of the First Embodiment> According to the first embodiment described above, one of the following effects can be obtained. (1) During maintenance performed regularly or irregularly, the worker 26 can disassemble the flange fastener 2 to be diagnosed and measure the flange surfaces 16 of flanges 6-1 and 6-2 with a 3D scanner 22 to obtain surface pressure information from the flange surfaces 16, and obtain one or more of the following as a diagnosis result: repair details, repair timing, or repair costs. This diagnosis allows for obtaining repair information as a diagnosis result that does not depend on the skills or experience of the worker. 【0112】 (2) Deterioration information representing the deterioration state of the flange surface 16, such as distortion, unevenness, and inclination on the flange surface 16, can be converted into a numerical reduction in surface pressure. This process leaves no room for human error, and the severity of fluid leakage can be quantified as a reduction in surface pressure on the flange surface 16. 【0113】 (3) From the fluid leakage risk level converted from the state information representing the deterioration state of the flange surface 16, it is possible to determine if the issue cannot be addressed by normal repairs. In this case, information on resetting the tightening axial force of the bolt 10 can be provided, taking into account the strength of the bolt 10, gasket 8, flanges 6-1 and 6-2. This information on the increase or decrease in tightening axial force can be generated and presented in relation to the position information of the bolt 10 and can be used in on-site construction during repairs. 【0114】 (4) In the repair plan, the repairable range of the flange surface 16, i.e., the cuttable range, can be determined using the periodic measurement timing as the horizontal axis. In addition, the cumulative repair cost is updated with each repair, and if the cumulative repair cost exceeds the limit, information on proposals for equipment replacement in addition to normal repairs can be presented. 【0115】 (5) Deterioration of the flange surfaces 16 of flanges 6-1 and 6-6 may cause uneven sealing pressure of the gasket 8. However, by comparing the condition information of the flange surfaces 16 after deterioration with the condition information of the flange surfaces 16 in the ideal state before deterioration as a reference, information on the increase or decrease in tightening axial force can be presented along with the position information of the bolts 10. 【0116】 (6) The management and handling of fluid leakage factors in the flange fastening body 2 can be made less reliant on the worker's experience and intuition, thereby reducing the burden on the worker and decreasing unforeseen incidents and troubles such as fluid leakage. 【0117】 [Second Embodiment] The diagnostic system according to the second embodiment uses the diagnostic system 18 (Figure 2) described above, and the diagnostic process includes: (a) Measurement of the surface pressure range of the flange surface 16 (b) Measurement of surface pressure range and surface pressure width (c) Calculation of surface pressure reduction using surface pressure width (d) Selection of repair items identified by the amount of surface pressure reduction This includes processes such as those mentioned above. 【0118】 Figure 10 shows the diagnostic processing procedure according to the second embodiment. In this processing procedure, S represents a process, and the numbers attached to S indicate the order of the processes; however, this disclosure is not limited to this order of processes. 【0119】 This processing procedure includes acquiring three-dimensional point cloud data of the flange surface 16 (S301), measuring the surface pressure range (S302), measuring the surface pressure width (S303), calculating the surface pressure reduction width (S304), acquiring repair information (S305), selecting the repair content (S306), evaluating maintenance including the cumulative repair costs (S307), and presenting the diagnostic results (S308). 【0120】 The acquisition of three-dimensional point cloud data of the flange surface 16 (S301) is the same as the acquisition of three-dimensional point cloud data of the flange surface 16 (S101) described above, and the measurement of the surface pressure range (S302) is the same as the measurement of the surface pressure range (S102) described above, so the explanation is omitted. 【0121】 Measurement of surface pressure width (S303): The diagnostic processing unit 28 measures the surface pressure width from the acquired surface pressure range. In other words, since the surface pressure range is annular, it measures the width in the radial direction of the surface pressure range. 【0122】 Calculation of surface pressure reduction (S304): In this embodiment, the amount of surface pressure reduction due to deterioration is calculated using the surface pressure measurement in S303 and the surface pressure before deterioration, and this amount of surface pressure reduction is assumed to be the amount of surface pressure reduction. 【0123】 Acquisition of repair information (S305): Repair information is acquired using the surface pressure reduction width calculated in S304. 【0124】 The selection of repair items (S306) is the same as the selection of repair items (S105) described above, the maintenance evaluation including cumulative repair costs (S307) is the same as the maintenance evaluation including cumulative repair costs (S106) described above, and the presentation of diagnostic results (S308) is the same as the presentation of diagnostic results (S107) described above, so these explanations will be omitted. 【0125】 <First DB38 and second DB52 according to the second embodiment> In this second embodiment, as in the first embodiment, the first DB38 and second DB52 are used, but the difference from the first embodiment is that the surface pressure width and surface pressure reduction width are stored, and the aforementioned repair items, repair time, and cost related to this surface pressure reduction width are stored, and from the repair items specified by the surface pressure reduction width, one or more items such as gasket replacement, polishing, cutting, and flange fastener replacement, repair time, and cost can be selected. 【0126】 <Measurement of surface pressure width within the surface pressure range before and after deterioration> Figure 11A shows the flange surface 16 before deterioration, and Figure 11B shows the flange surface 16 after deterioration. 【0127】 The surface pressure width W is measured from the surface pressure range 74 before deterioration, and the surface pressure width W is measured from two radial sections b1-b1 on the flange surface 16, separated by, for example, 45°, from the surface pressure ranges 74-1 and 74-2 after deterioration, and the surface pressure width is measured from the b2-b2 section. 【0128】 Figure 12A shows the surface pressure width W0 measured from surface pressure range 74, Figure 12B shows the surface pressure width W11 measured from the b1-b1 portion of surface pressure range 74-1, and the surface pressure width W12 measured from the b1-b1 portion of surface pressure range 74-2, while Figure 12C shows the surface pressure widths W21 and W22 measured from the b2-b2 portions of surface pressure ranges 74-1 and 74-2. 【0129】 By comparing the surface pressure width W0 with the respective surface pressure widths W11, W12, W21, and W22, we can express their relative magnitudes as shown in equation (9). 【0130】 W0>W11+W12 and W0>W21+W22 ... (9) Thus, as an example of calculating the reduction in surface pressure width, a comparison of surface pressure widths W at at least two locations can be used. 【0131】 <Effects of the second embodiment> According to this second embodiment, the following effects can be obtained. (1) Even if the surface pressure width is determined from the surface pressure range before and after deterioration, maintenance of flanges 6-1, 6-2, etc., in accordance with the deterioration of flange surface 16 can be performed. 【0132】 (2) When the flange surface 16 deteriorates and the surface pressure range changes from the pre-deterioration surface pressure range 74 to the post-deterioration surface pressure range 74-1, 74-2, the deterioration state of the flange surface 16 can be identified using the change in surface pressure width. Using this reduced surface pressure width, the previously described repair items, repair time, and cost associated with this reduced surface pressure width are stored, and one or more of the following items, repair time, and cost can be selected from the repair items identified by the reduced surface pressure width: gasket replacement, polishing, cutting, and flange fastener replacement. 【0133】 [Third Embodiment] The diagnostic system according to the third embodiment uses the diagnostic system 18 (Figure 2) described above, and the diagnostic process includes: (a) Measurement of the surface pressure range of the flange surface 16 (b) Calculation of surface pressure reduction rate (c) Selection of repair items identified by the surface pressure reduction rate This includes processes such as those mentioned above. 【0134】 Figure 13 shows the diagnostic processing procedure according to the third embodiment. In this processing procedure, S represents a process, and the numbers attached to S indicate the order of the processes; however, this disclosure is not limited to this order of processes. 【0135】 This processing procedure includes acquiring three-dimensional point cloud data of the flange surface 16 (S401), measuring the surface pressure range (S402), calculating the surface pressure reduction rate (S403), acquiring repair information (S404), selecting the repair content (S405), evaluating maintenance including the cumulative repair costs (S406), and presenting the diagnostic results (S407). 【0136】 The acquisition of three-dimensional point cloud data of the flange surface 16 (S401) is the same as the acquisition of three-dimensional point cloud data of the flange surface 16 (S101) described above, and the measurement of the surface pressure range (S402) is the same as the measurement of the surface pressure range (S102) described above, so the explanation is omitted. 【0137】 Calculation of surface pressure reduction rate (S403): The surface pressure range before and after deterioration is compared to calculate the surface pressure reduction rate due to deterioration. 【0138】 Acquisition of repair information (S404): Acquire repair information related to the surface pressure reduction rate. That is, select one or more items, repair time, and cost from the repair items identified from the previously described repair items, repair time, and cost, such as gasket replacement, polishing, cutting, and flange fastener replacement. 【0139】 The selection of repair items (S405) is the same as the selection of repair items (S105) described above, the maintenance evaluation including cumulative repair costs (S406) is the same as the maintenance evaluation including cumulative repair costs (S106) described above, and the presentation of diagnostic results (S407) is the same as the presentation of diagnostic results (S107) described above, so these explanations will be omitted. 【0140】 <First DB38 and second DB52 relating to the third embodiment> In this third embodiment, as in the first embodiment, the first DB38 and second DB52 are used, but the difference from the first embodiment is that the surface pressure reduction rate is stored, and the aforementioned repair items, repair time, and cost related to this surface pressure reduction width are stored, and from the repair items specified by the surface pressure reduction rate, one or more items such as gasket replacement, polishing, cutting, and flange fastener replacement, repair time, and cost can be selected. 【0141】 <Effects of the Third Embodiment> According to this third embodiment, one of the following effects can be obtained. (1) Even if the surface pressure reduction rate obtained from the surface pressure range before and after deterioration is used, maintenance of flanges 6-1, 6-2, etc., in accordance with the deterioration of flange surface 16 can be performed. 【0142】 (2) If the surface pressure range 74 before deterioration changes due to deterioration of the flange surface 16, for example, from the surface pressure range 74-1 and 74-2 after deterioration, the surface pressure reduction rate is calculated from the change in surface pressure range, and the repair items, repair time, and cost described above, which are related to this surface pressure reduction rate, are stored, and one or more items, repair time, and cost can be selected from the repair items, such as gasket replacement, polishing, cutting, and flange fastener replacement. 【0143】 [Fourth Embodiment] The diagnostic system according to the fourth embodiment uses the diagnostic system 18 (Figure 2) described above, and the diagnostic process includes: (a) Measurement of the surface pressure range of the flange surface 16 (b) Calculation of the rate of decrease in surface pressure (c) Selection of repair items identified by the rate of decrease in surface pressure This includes processes such as those mentioned above. 【0144】 Figure 14 shows the diagnostic processing procedure according to the fourth embodiment. In this processing procedure, S represents a process, and the numbers attached to S indicate the order of the processes; however, this disclosure is not limited to this order of processes. 【0145】 This processing procedure includes acquiring three-dimensional point cloud data of the flange surface 16 (S501), measuring the surface pressure range (S502), calculating the amount of surface pressure reduction (S503), acquiring the elapsed time (S504), calculating the rate of surface pressure reduction (S505), acquiring repair information (S506), selecting the repair content (S507), evaluating the maintenance including the cumulative repair costs (S508), and presenting the diagnostic results (S509). 【0146】 The acquisition of three-dimensional point cloud data of the flange surface 16 (S501) is the same as the acquisition of three-dimensional point cloud data of the flange surface 16 (S101) described above, and the measurement of the surface pressure range (S502) is the same as the measurement of the surface pressure range (S102) described above, so the explanation is omitted. 【0147】 Calculation of surface pressure reduction (S503): The amount of surface pressure reduction due to deterioration is calculated by comparing the surface pressure range before and after deterioration. 【0148】 Acquisition of elapsed time (S504): The diagnostic device 24 acquires the elapsed time before and after deterioration. This elapsed time can be, for example, the elapsed time until the first maintenance, the maintenance interval, etc., using the elapsed time before and after deterioration. 【0149】 Calculation of surface pressure reduction rate (S505): The diagnostic device 24 calculates the surface pressure reduction rate using, for example, the surface pressure area and elapsed time before and after deterioration, which represent the surface pressure range before and after deterioration. In this case, if the surface pressure area before deterioration is S0, the surface pressure area after deterioration is S1, and the elapsed time is T, the surface pressure reduction rate Sv can be calculated from equation (10). 【0150】 Sv = (S0 - S1) ÷ T ... (10) 【0151】 Acquisition of repair information (S506): Acquire repair information related to the rate of surface pressure reduction. That is, from the previously described repair items, repair time, and cost, select one or more items, repair time, and cost from the repair items specified by the rate of surface pressure reduction, such as gasket replacement, polishing, cutting, and flange fastener replacement. 【0152】 The selection of repair items (S507) is the same as the selection of repair items (S105) described above, the maintenance evaluation including cumulative repair costs (S508) is the same as the maintenance evaluation including cumulative repair costs (S106) described above, and the presentation of diagnostic results (S509) is the same as the presentation of diagnostic results (S107) described above, so these explanations will be omitted. 【0153】 <First DB38 and second DB52 according to the fourth embodiment> In this fourth embodiment, as in the first embodiment, the first DB38 and second DB52 are used, but the difference from the first embodiment is that the surface pressure reduction rate is stored, and the aforementioned repair items, repair time, and cost associated with this surface pressure reduction rate are stored, and one or more items, repair time, and cost can be selected from the repair items specified by the surface pressure reduction rate, such as gasket replacement, polishing, cutting, and flange fastener replacement. 【0154】 <Effects of the fourth embodiment> According to this fourth embodiment, the following effects can be obtained. (1) Even if the surface pressure reduction rate obtained from the surface pressure range before and after deterioration is used, maintenance of flanges 6-1, 6-2, etc., in accordance with the deterioration of flange surface 16 can be performed. 【0155】 (2) If the surface pressure range 74 before deterioration changes due to deterioration of the flange surface 16, for example, from the surface pressure range 74-1, 74-2 after deterioration, the rate of surface pressure reduction is calculated from the change in surface pressure range, and the repair items, repair time, and cost described above, which are related to this rate of surface pressure reduction, are stored, and one or more items, repair time, and cost can be selected from the repair items specified by the rate of surface pressure reduction, such as gasket replacement, polishing, cutting, and flange fastener replacement. [Examples] 【0156】 <Adjusting tightening axial force> Figure 15 shows the processing procedure for adjusting the tightening axial force according to Example 1. This processing procedure includes acquiring tightening axial force information (S601), comparing it with the reference tightening axial force (S602), calculating the difference in tightening axial force (S603), presenting tightening axial force distribution information (S604), adjusting the tightening axial force of the corresponding bolt 10 (S605), presenting the tightening axial force distribution information after adjustment (S606), determining whether all bolts 10 have been adjusted (S607), presenting the final tightening axial force distribution information (S608), determining that the adjustment is complete (S609), and presenting information on the increase or decrease in tightening axial force at each bolt position (S610). 【0157】 When adjustment of the tightening axial force is selected as the repair item, the diagnostic device 24 acquires tightening axial force information (S601), compares the tightening axial force with the reference tightening axial force (S602), calculates the difference in tightening axial force (S603), and presents the tightening axial force distribution information, which is related to the position information of the bolt 10, to the information display unit 30 (S604). 【0158】 With this tightening axial force distribution information displayed, the tightening axial force of a specific bolt 10 is adjusted (S605), the tightening axial force distribution information is updated to reflect the adjusted information, and this updated information is presented to the information display unit 30 (S606). This process is performed for each bolt 10, and the diagnostic device 24 determines whether the adjustment of the tightening axial force has been completed for all bolts 10 (S607). 【0159】 If the axial force adjustment of all bolts 10 is not completed (NO in S607), the process from S601 to S607 continues until the axial force adjustment of all bolts 10 is completed. Then, once the axial force adjustment of all bolts 10 is completed (YES in S607), the final tightening axial force distribution information is presented (S608), and the diagnostic device 24 requests response information indicating whether the tightening axial force adjustment is complete (S609). 【0160】 If the adjustment of the tightening axial force is not complete (NO in S609), the process from S605 to S609 continues until the adjustment of the tightening axial force is complete. Then, when response information indicating that the adjustment of the tightening axial force is complete is received (YES in S609), the diagnostic device 24 presents increase / decrease information representing the increase / decrease value of the tightening axial force at each bolt position (S610) and terminates this process. 【0161】 <Effects of Example 1> According to Example 1 described above, one of the following effects can be obtained. (1) The clamping axial force can be adjusted in accordance with the deterioration of the surface pressure range. 【0162】 (2) The tightening axial force can be adjusted or set to an appropriate level depending on the deterioration or maintenance of the flange surface 16. [Examples] 【0163】 <Diagnosis of the degree of deterioration in the surface pressure range of the flange surface 16> Figure 16 shows the procedure for diagnosing the degree of deterioration in the surface pressure range of the flange surface 16 according to Example 2. The deterioration is diagnosed separately from the repair of the flange surface 16, and a process is performed to reduce the need for irregularly scheduled maintenance. In this example, the rate of decrease in surface pressure is used as an example of the degree of deterioration. 【0164】 This processing procedure includes obtaining surface pressure range information (S701), obtaining time information (S702), calculating the surface pressure reduction rate (S703), determining the surface pressure reduction rate (S704), determining the suitability of the operating environment for the flange fastener 2 (S705), presenting repair information (S706), determining the unsuitability of the operating environment for the flange fastener 2 (S707), and presenting information such as replacement information (S708). 【0165】 When the diagnosis of the rate of decrease in surface pressure on the flange surface 16 is selected, the diagnostic device 24 acquires surface pressure range information (S701) and time information representing the elapsed time (S702). 【0166】 The diagnostic device 24 calculates the rate of surface pressure reduction using the amount of surface pressure reduction and time information included in the surface pressure range information (S703), and compares the rate of surface pressure reduction with the reference rate (S704). If the rate of surface pressure reduction is less than or equal to the reference rate (YES in S704), the diagnostic device 24 determines that the flange fastener 2 is suitable for the operating environment (S705), presents repair information to the information display unit 30 (S706), and terminates this process. 【0167】 If the surface pressure reduction rate is greater than the reference rate (NO in S704), the diagnostic device 24 determines that the flange fastener 2 is unsuitable for the operating environment (S707), and presents replacement information, such as replacing the flange fastener 2, to the information presentation unit 30 (S708), and terminates this process. This replacement information includes optimal design information such as the flange thickness of flanges 6-1 and 6-2 of the flange fastener 2 and the hub thickness of pipes 4-1 and 4-2. 【0168】 <Effects of Example 2> According to the above-described Example 2, the following effects can be obtained. (1) The rate of decrease in surface pressure is calculated based on the amount of decrease in surface pressure and the elapsed time. As a diagnosis of this rate of decrease in surface pressure, if the rate of decrease in surface pressure exceeds the normal rate of decrease, it is expected that the flange fastener 2 is not suitable for the operating environment. This can be used as an opportunity to propose optimal design information for the flange fastener 2 or new equipment, such as changing the flange thickness of flanges 6-1 and 6-2, or the hub thickness of pipes 4-1 and 4-2. 【0169】 (2) If the rate of decrease in surface pressure is below the standard rate, repairs can be carried out by waiting for the normal maintenance period to arrive. However, if the rate of decrease in surface pressure exceeds the standard rate, there is a risk of unforeseen events such as fluid leakage occurring before the scheduled maintenance. Measures to avoid such an event can be taken quickly. 【0170】 [Fifth Embodiment] The fifth embodiment discloses a life prediction system and life prediction method for performing life prediction diagnosis of a flange fastener 2 (Figure 1). The life prediction diagnosis of the flange fastener 2 includes accumulating condition data acquired from the flanges 6-1 and 6-2 (hereinafter referred to as "flanges"), and life prediction diagnosis based on the condition data. The life prediction diagnosis includes: (a) Prediction of flange damage (b) Predicting the optimal timing for repairs (c) Prediction of cutting amount (d) Prediction of maintenance / repair costs (e) Prediction of sealing surface pressure value (f) Predicting the optimal timing for equipment replacement This includes, among other things. Damage also includes the amount of flange distortion, the amount of scratches / maximum depth, etc., that occurred on the sealing surface of the flange. 【0171】 <Life Prediction System 100> Figure 17A shows a life prediction system 100 according to the fifth embodiment. This life prediction system 100 includes a 3D scanner 22, a terminal device 102, and a server 104. The terminal device 102 constitutes the diagnostic device 24 (Figure 2A) described above. The server 104 is composed of a computer equipped with a processor, memory, input / output (I / O) unit, communication unit, etc. (not shown). 【0172】 The 3D scanner 22 is connected to a terminal device 102, for example, by wired or wireless communication, and the terminal device 102 is connected to a server 104 via a network 106. The 3D scanner 22 acquires state data from the flange. The state data is 3D data representing the state of the flange surface 16 or sealing surface 17 of the flange. The terminal device 102 acquires the state data from the 3D scanner 22 and transmits it to the server 104. 【0173】 Server 104 acquires and stores status data from terminal device 102. Server 104 acquires status data at least twice at regular time intervals (for example, every 1, 4, or 8 years as maintenance intervals), specifically acquiring and storing status data for each maintenance, and performs the life prediction diagnosis described above using the status data acquired at different times. As described above, this prediction diagnosis includes prediction of flange damage, prediction of the optimal timing for repair, prediction of cutting amount, prediction of maintenance / repair costs, prediction of seal surface pressure value, prediction of the optimal timing for equipment replacement, etc., and is provided as diagnostic information, for example, a flange medical record. 【0174】 The prediction and diagnosis of flange damage includes progression information such as the amount of flange strain, the amount of damage / maximum depth, etc., that has occurred on the sealing surface 17 of the flange. The prediction of the optimal timing for repair includes the optimal timing or duration for repair. The prediction of the amount of cutting includes cutting of the sealing surface as well as cutting after repairing damage. The prediction of maintenance / repair costs includes the costs required for maintenance and repair. The prediction of the sealing surface pressure value includes information on changes in the surface pressure of the sealing surface. The prediction of the optimal timing for equipment replacement includes replacement of the flange fastener 2 as an alternative to repair. 【0175】 The server 104 then creates a trend chart based on the prediction information. This trend chart information is provided from the server 104 to the terminal device 102. The terminal device 102 is equipped with an information display unit 30, which displays the lifespan prediction diagnosis, the lifespan prediction diagnosis results, the trend chart, etc. The terminal device 102 corresponds to an information display unit that displays diagnostic information or lifespan prediction information indicating the lifespan of a component. 【0176】 In this embodiment, the life prediction system 100 collects 3D data from a flange, which is an example of a component, and performs a life prediction diagnosis of the flange. This life prediction system 100 collects three-dimensional point cloud data as state data. A 3D scanner 22 is used to collect this three-dimensional point cloud data, and the terminal device 102 acquires the three-dimensional point cloud data representing the state of the sealing surface 17 from the 3D scanner 22 and transmits it to the server 104. The sealing surface 17 corresponds to the flange surface 16 (B in Figure 1) described above, and when a pair of flanges are fastened together, it is the surface that presses against the gasket 8 shown in Figure 1 to create a seal. 【0177】 Server 104 stores three-dimensional point cloud data acquired from terminal device 102. In this embodiment, server 104 stores the three-dimensional point cloud data as a storage device, for example, in the cloud. Server 104 acquires three-dimensional point cloud data from terminal device 102 at predetermined time intervals. This allows server 104 to accumulate multiple sets of three-dimensional point cloud data acquired at different times. Therefore, three-dimensional point cloud data is collected in the cloud. This cloud may be a database located on server 104. 【0178】 This life prediction system 100 stores three-dimensional point cloud data of the sealing surface 17 on the cloud, and stores condition data of the flange surface including the sealing surface 17, such as the condition of the sealing surface 17 8 years ago, the condition of the sealing surface 17 4 years ago, the condition of the sealing surface 17 1 year ago, etc. Therefore, this life prediction system 100 stores condition data from the past to the present on the cloud at predetermined time intervals, performs a life prediction diagnosis of the flange using the three-dimensional point cloud data collected over multiple years at predetermined time intervals, and provides life prediction diagnosis information as a result. In this embodiment, the server 104 corresponds to a condition data acquisition unit that acquires condition data two or more times at specific time intervals. In this embodiment, the server 104 corresponds to a prediction unit that predicts the condition changes of the flange, which is a component. 【0179】 <Condition data for seal surface 17> Figure 17B shows a magnified view of a portion of the flange's sealing surface 17 (part 17B in Figure 17A). Multiple deposits 108 and scratches 110 are present on this flange's sealing surface 17, and these deposits 108 and scratches 110 are reflected in the condition data of the sealing surface 17. 【0180】 <Processing procedure for life expectancy prediction diagnosis> Figure 18 shows the processing procedure for lifespan prediction diagnosis. This processing procedure is an example of the lifespan prediction method and lifespan prediction program described herein. 【0181】 This processing procedure includes monitoring maintenance timing (S801), acquiring condition data (S802), evaluating the amount of damage (S803), acquiring information on the progression of condition data (S804), predictive processing such as damage prediction (S805), creating a trend chart (S806), and presenting trend data TD (S807). Step S802 corresponds to a condition data acquisition process in which condition data of the flange, which is a component, is acquired two or more times at predetermined time intervals. Step S805 corresponds to a prediction process in which the progression of the flange's condition is predicted based on the condition data. Step S807 corresponds to an information presentation process in which diagnostic information or life prediction information indicating the lifespan of the flange is presented based on the prediction. Note that the above processing procedure is performed when condition data acquired at different times has been accumulated, and if sufficient condition data has not yet been accumulated, the process may be stopped at step 802. Furthermore, the processing procedure may be configured without including monitoring maintenance timing (S801). 【0182】 Server 104 monitors the maintenance schedule for the flange fastener 2 based on the equipment installation date, etc. (S810). When the maintenance schedule arrives (YES in S801), the 3D scanner 22 acquires condition data from the sealing surface 17 of the flange based on the maintenance of the flange fastener 2 (S802). This condition data is provided to terminal device 102, and transmitted from terminal device 102 to server 104. The condition data acquired by server 104 is stored in a database and accumulated for each maintenance period. 【0183】 Server 104 evaluates the deposits 108, scratches 110, and scratch amount on the sealing surface 17 based on the acquired state data (S803). 【0184】 The server 104 obtains transition information representing the state of the sealing surface 17 using state data acquired at least twice at regular time intervals (S804), and based on this transition information, performs calculations such as predicting damage to the sealing surface 17, predicting the optimal timing for repairs, predicting the amount of cutting, predicting maintenance / repair costs, predicting the sealing surface pressure value, and predicting the optimal timing for equipment replacement (S805). 【0185】 Server 104 creates trend charts (such as trend chart T-11 in Figure 19, trend chart T-12 in Figure 29, trend chart T-21 in Figure 30, and trend chart T-22 in Figure 31) (S806) and presents trend data TD including the trend charts (T-11, T-12, T-21, T-22, etc.) (S807). The trend data TD is provided from Server 104 to Terminal Device 102 and displayed on the Information Display Unit 30 of Terminal Device 102. This trend data TD includes diagnostic information such as the flange medical record described later. 【0186】 <Trend Chart T-11> Figure 19 is an example of a trend chart T-11 showing the change in parameter values ​​over time, with the horizontal axis representing elapsed time (= years) t(t1, t2, ...) and the vertical axis representing parameter values ​​(measured values). The parameter values ​​are data that represent flange damage and relate to flange deterioration or repair. As an example, they include parameter value D1, which represents flange strain, scratch amount / scratch 110 maximum depth, and parameter value D2, which represents the range of repairable surface. Dmax is the damage limit of the sealing surface 17, Dmin is the repairable limit of the sealing surface 17, and tf is the optimal repair timing for the sealing surface 17. Elapsed time t=tf represents the optimal repair timing for the flange. 【0187】 The parameter value D1 is determined based on three-dimensional point cloud data. Server 104 uses the accumulated three-dimensional point cloud data to determine the long-term trend of change for various parameter values ​​D1 and D2 related to the flange lifespan. 【0188】 <Flange strain amount> An example of parameter value D1, flange strain, is determined by the difference between the acquired value and the allowable value, which is obtained based on the three-dimensional point cloud data acquired by the 3D scanner 22. For example, the difference with the allowable value at each measurement angle is identified, and the aging deterioration of the one with the largest difference is checked. Specifically, in this embodiment, the flange strain in the radial direction of the flange is determined at a total of eight locations at 45-degree intervals. To determine the flange strain, the server 104 determines the height of the eight sealing surfaces 17, for example, shown by the dashed lines 17-1 and 17-2 in Figure 1B, based on the three-dimensional point cloud data. Figure 20A is an example of a graph showing the height of the sealing surface 17 in the radial direction of the flange. The angle in the upper left of each graph is the measurement angle representing the measurement position in the radial direction of the flange. At each measurement angle, the server 104 calculates the height of the sealing surface 17, i.e., the maximum value h1~h8 and minimum value l1~l8 of the measured value. 【0189】 The server 104 then determines the parameter value D1 based on the maximum and minimum values ​​of each measurement. The server 104 may also determine the parameter value D1 based on the maximum, minimum, and tolerance values ​​of each measurement. For example, the server 104 may use the parameter value D1 as a comparison between the maximum or minimum value of each measurement and the tolerance value, or as the difference between the maximum or minimum value of each measurement and the tolerance value. In this case, two tolerance values ​​are required: one to compare with the maximum value of the measurement and another to compare with the minimum value of the measurement. 【0190】 Furthermore, the damage limit Dmax shown in the trend chart T-11 in Figure 19 has two parameters: one corresponding to the difference between the maximum measured value and the allowable value, and another corresponding to the difference between the minimum measured value and the allowable value. Server 104 calculates the maximum measured values ​​h1~h8 and minimum measured values ​​l1~l8 for each three-dimensional point cloud data acquired at different times. As an example, the maximum measured values ​​h1, h2, h1', h2' and minimum measured values ​​l1, l2, l1', l2' obtained from three-dimensional point cloud data acquired in year A and year B (after year A) are shown in Figures 20B to 20C. In the prediction of the parameter value D1, which will be described later, the changes in the maximum and minimum measured values ​​are predicted based on the change over time of the predicted radial strain value of the flange, as shown in Figure 20D. 【0191】 In this embodiment, the server 104 determines the flange strain in the circumferential direction of the flange for the outer diameter, central, and inner diameter portions of the sealing surface 17. To determine the flange strain, the server 104 determines the height of the sealing surface 17 at the location indicated by the dashed line 17-2 in Figure 1B, for example, based on three-dimensional point cloud data. Figure 21A is an example of a graph showing the height of the sealing surface 17 in the circumferential direction of the flange. Next, the server 104 calculates the height of the sealing surface 17, i.e., the maximum values ​​h9~h11 and minimum values ​​l9~l11 of the measured values, for the outer diameter, central, and inner diameter portions of the sealing surface 17. Then, the server 104 takes the difference between the maximum or minimum value of each measured value and the allowable value as the parameter value D1. In this case, two allowable values ​​are required: one to be compared with the maximum value of the measured value and another to be compared with the minimum value of the measured value. 【0192】 Furthermore, the damage limit Dmax shown in the trend chart T-11 in Figure 19 has two parameters: one corresponding to the difference between the maximum measured value and the allowable value, and another corresponding to the difference between the minimum measured value and the allowable value. Server 104 calculates the maximum measured values ​​h9~h11 and minimum measured values ​​l9~l11 for each three-dimensional point cloud data acquired at different times. As an example, the maximum measured values ​​h11, h11' and minimum measured values ​​l11, l11' obtained from three-dimensional point cloud data acquired in year A and year B (after year A) are shown in Figure 21 B to Figure 21 C. In the prediction of the parameter value D1, which will be described later, the changes in the maximum and minimum measured values ​​are predicted based on the change over time of the predicted circumferential strain value of the flange, as shown in Figure 21 D. The reference point for radial strain shown in Figure 20A is set on the reference plane, the reference point for circumferential strain shown in Figure 21A is set from the average of the acquired circumferential strain graphs, and the tolerance value indicates the allowable range from the reference plane. 【0193】 <Wound 110 and its extent> Damage 110 indicates a damage that has been identified as abnormal. The damage quantity, which represents the amount of damage 110, can be simply evaluated based on the quantity of the damage 110 identified as abnormal. This damage quantity is related to the length and depth D of the detected damage 110. 【0194】 Figure 22A shows an example of a method for calculating the length of the detected scratch 110, and Figure 22B shows another example of a method for calculating the length of the scratch 110. 【0195】 Assuming that a gasket 8 (Figure 1) is installed on the sealing surface 17, the fluid leakage caused by the crack 110 is greater for cracks 110 extending radially than for cracks 110 extending circumferentially on the sealing surface 17. Therefore, it is necessary to evaluate the length of the crack 110. To do this, when evaluating the length of the crack 110, the apparent length L of the crack 110, which corresponds to the radial length of the flange, is calculated. 【0196】 Therefore, the server 104 calculates the apparent length L of the scratch 110 detected from the sealing surface 17. Referring to A in Figure 22, the apparent length L of the scratch 110 corresponds to the radial length of the flange at the scratch 110. At the scratch 110, one end is P1, the other end is P2, and the flange center is O. A line segment is drawn connecting the flange center O and one end P1 of the scratch 110, and a perpendicular line is drawn from the other end P2 to this line segment, and the intersection point of this line segment and the perpendicular line is Q. Let θ be the angle between the line segment (P1-P2) representing the scratch 110 and the line segment (P1-Q). Using the length of the line segment (P1-P2), the angle θ, and trigonometric functions, the length of the line segment (P1-Q) can be calculated by equation (11). 【0197】 Length of line segment (P1-Q) = Length of line segment (P1-P2) × cosθ ...(11) 【0198】 The portion of the line segment (P1-Q) that is contained within the sealing surface 17 represents the apparent length L. In the line segment (P1-Q), the distance Lx between the intersection point Q and the inner circumference 112 of the sealing surface 17 is not considered part of the apparent length of the scratch 110. Therefore, the apparent length L of the scratch 110 can be calculated from equation (12). 【0199】 Apparent length L = length of line segment (P1-P2) × cosθ - Lx ...(12) 【0200】 Furthermore, regarding another method for determining the apparent length L of the scratch 110, referring to Figure 22B, the length L1 of the line segment connecting the flange center O and one end P1 of the scratch 110, and the length L2 of the line segment connecting the flange center O and the other end P2 of the scratch 110 are calculated. Server 104 can calculate the difference between length L1 and length L2 as the apparent length L of the scratch 110 using equation (13). 【0201】 Apparent length L = length L2 - length L1 ... (13) 【0202】 The depth D of the scratch 110 is calculated as the maximum depth of the scratch 110 using three-dimensional point cloud data. Server 104 makes a pass / fail judgment based on the apparent length L and the maximum depth, and the number of defective (NG) scratches 110 may be used as the scratch quantity, which is an example of the parameter value D1 shown in the trend chart T-11 (Figure 19). Server 104 makes a pass / fail judgment of the scratches 110 based on the judgment criteria shown in Figure 23, for example. The judgment criteria include the ratio of the scratch width to the seal surface width, as shown in A of Figure 23. The seal surface width is the length of the seal surface 17 in the radial direction of the flange. The scratch width is the apparent length L of the scratch obtained as described above. The judgment criteria are set for each type of gasket, such as soft gaskets and metal gaskets. The judgment criteria for the scratch width ratio are defined for scratch width ratios up to 1 / 4, 1 / 4 to 1 / 2, 1 / 2 to 3 / 4, and 3 / 4 to the entire scratch width. When a soft gasket is used, server 104 determines a defect if the defect width is between 3 / 4 and the entire length L, and if the defect depth exceeds the set limits for up to 1 / 4, 1 / 4 to 1 / 2, and 1 / 2 to 3 / 4. When a metal gasket is used, the management server determines a defect if the defect width is between 1 / 2 and 3 / 4 of the length L, and if the defect width is between 3 / 4 and the entire length L, and if the defect depth exceeds the set limits for up to 1 / 4 and 1 / 4 to 1 / 2. Server 104 may also use the criteria shown in Figure 23B to determine whether a gasket is good or bad. 【0203】 Based on the criteria shown in Figure 23B, server 104 determines that a soft gasket needs repair if the scratch width is up to 1 / 4 and the scratch depth is 1.27 mm or more, if the scratch width is between 1 / 4 and 1 / 2 and the scratch depth is 0.76 mm or more, if the scratch width is between 1 / 2 and 3 / 4 and the scratch depth is 0.13 mm or more, or if the scratch width is between 3 / 4 and the entire gasket. Server 104 also determines that a semi-metallic or metal gasket needs repair if the scratch width is up to 1 / 4 and the scratch depth is 0.76 mm or more, if the scratch width is between 1 / 4 and 1 / 2 and the scratch depth is 0.25 mm or more, or if the scratch width is between 1 / 2 and 3 / 4 or 3 / 4 and the entire gasket. 【0204】 The amount of damage may be determined by measuring the area of ​​the damage 110, or by the ratio of the damage area to the area of ​​the sealing surface 17 obtained by drawing tangents to the left and right sides of the damage from the flange center O. In this case, the evaluation is performed by summing the damage area relative to the gasket sealing area. Damage 110 is not detected at each measurement angle, and the quality is judged based on the length L and depth D of each individual damage 110. 【0205】 As shown in Figure 24A, the area Sm of the sector-shaped portion 116, which is formed by the intersection points a, b, c, and d of the inner circumference 112 and outer circumference 114 of the sealing surface 17, and the area Sn of the scratch 110, can be calculated and determined using formula (14) to determine the ratio of the scratch area Sn to the sector-shaped portion 116 (= scratch area ratio η). 【0206】 Flaw area rate η=(Sn / Sm)×100(%) ···(14) 【0207】 The calculation of the scratch area ratio η involves determining the degree of leakage impact by comparing the area of ​​gasket scratches on the sealing surface 17. In other words, the determination should be made based on the total area of ​​scratches 110 relative to the total area of ​​the sealing surface 17. For this determination, specific scratches 110 may be identified in the sector-shaped section 116 (A in Figure 24) as described above. 【0208】 Then, as shown in Figure 24B, the type of gasket, such as a soft gasket or a metal gasket, is identified, and the ratio of the damaged area Sn to the sector-shaped portion 116 is determined. As a criterion for determining the length L and depth D of the damage 110, four sections are set for the sealing surface 17, for example, a 1 / 4 section, a 1 / 4 to 1 / 2 section, a 1 / 2 to 3 / 4 section, and a section to the entire surface. Based on the criteria for determining whether the damage is good or bad, the evaluation may be performed using the maximum damaged area ratio η for each section. In this case, the damaged area ratio η can be used as the amount of damage. Then, the progression of large damages 110 that are expected to affect fluid leakage is checked for each of the four sections. 【0209】 <Integrated assessment of injury 110> The area occupied by the scratches 110 relative to the sealing surface 17 is uncertain, and if the area is small, the small scratches 110 may be underestimated, affecting the accuracy of the flange life diagnosis. To avoid this, adjacent scratches 110 are merged to avoid the influence of area differences. 【0210】 Therefore, when there are multiple adjacent scratches 110, an integration region is defined as a method for integrating the multiple scratches 110. This integration region is an area for recognizing multiple adjacent scratches 110 as a single scratch 110 through integration. In the life prediction diagnosis, the proportion of the integrated scratches 110 to the sealing surface 17, including the integration region, is evaluated. Specifically, when multiple scratches 110 are close to each other, the server 104 performs information processing to integrate or combine the multiple scratches 110 as a single scratch 110. 【0211】 Referring to Figure 25A, the server 104 detects multiple scratches 110 = scratches A1, A2, and A3 present on the sealing surface 17. Subsequently, the server 104 calculates integration regions B1, B2, and B3 that correspond individually to each scratch A1, A2, and A3. Each integration region B1, B2, and B3 is set up to determine whether multiple scratches 110 can be integrated into a single scratch 110. Integration region B1 is defined by a distance of region width X from scratch A1, integration region B2 is defined by a distance of region width X from scratch A2, and similarly, integration region B3 is defined by a distance of region width X from scratch A3. 【0212】 Server 104 determines whether the multiple integration regions B1 to B3 overlap each other. In the integration regions B1 to B3 shown in Figure 25A, they overlap each other. Therefore, Server 104 integrates the multiple defects A1 to A3 into a single defect 110 and recognizes it as a single defect 110. 【0213】 Even when the damage 110 exhibits a complex shape such as bending, as shown in Figure 25B, integration processing is performed. Regardless of the shape of the damage 110, the server 104 similarly detects multiple damages A1 and A2 and calculates integration regions B1 and B2 that correspond individually to each damage A1 and A2. If the shapes of damages A1 and A2 are complex, the integration regions B1 and B2 cannot be calculated with the simple setting of the region width X described above. 【0214】 Therefore, as shown in Figure 25B, server 104 draws a reference line indicating the maximum length of scratch A1, and determines line segments C1 and C2 located at a distance of region width X from two ends or inflection points outside scratch A1 on the reference line. Next, server 104 identifies the end of scratch A1 located furthest from the reference line in the left and right directions perpendicular to the reference line. It determines line segments C3 and C4 located at a distance of region width X from the identified ends in each direction. The integrated region B1 is the region enclosed by line segments C1 to C4. Integrated region B2 is determined using the same calculation method. Server 104 determines whether each integrated region B1 and B2 overlap. In Figure 25B, integrated regions B1 and B2 overlap each other, so server 104 integrates the multiple scratches A1 and A2 and recognizes them as a single scratch 110. 【0215】 The same integration process is also performed when the damage 110 is in the form of multiple points, as shown in Figure 25C. Integration regions B1, B2, and B3 are formed by orbiting the centers p of the multiple damages A1, A2, and A3 with a region width X. Similarly, the integrated regions B1 to B3, which are simplified by overlapping the integrated regions B1, B2, and B3, may be recognized as a single damage 110 formed by the aggregation or combination of the multiple damages 110. 【0216】 <Apparent length L of integrated wound 110> Referring to Figure 26, let's assume that server 104, for example, combines multiple scratches A1, A2, and A3 and treats them as a single scratch 110. In this case, the maximum length of the combined scratch 110 is determined by the distance between R1 and R2 (the length of the line segment R1-R2), where R1 is the point closest to the flange center O among the positions of scratches A1, A2, and A3, and R2 is the point furthest from the flange center O among the positions of scratches A1, A2, and A3. Therefore, the apparent length L of the combined scratch 110 can be calculated using the length of this line segment R1-R2. Furthermore, the depth D of the combined scratch 110 corresponds to the depth D of the deepest scratch A1 to A3 among scratches A1, A2, and A3. 【0217】 Thus, the integrated region is defined as the sum of a perpendicular line from the end of the scratch 110 to a line based on the entire circumference or maximum length of the scratch 110, and a region width X of a constant value (for example, 1 mm). The length of the scratch 110 is measured not by the integrated region, but by the apparent length L at which the width W between the endpoints of the integrated scratch 110 is maximized, and the measurement method is as described above. Furthermore, the depth D is taken as the maximum value of the depth D of the integrated scratches. 【0218】 Furthermore, as shown in Figure 27A, the types of scratches 110 vary, including localized indentations 109 such as dents and linear scratches 110 caused by tools, etc. Also, protrusions such as deposits 108 may occur on the flange surface. For example, if two scratches 110 are merged, the judgment of whether they are good or bad may be made using the aforementioned criteria based on their maximum scratch height h1 and the merged scratch length L. To estimate the impact more broadly, if these merged scratches 110 and deposits 108 are adjacent and can be merged, as shown in Figure 27B, the difference between the height h3 of the deposits 108 and the maximum scratch height h1, i.e., the scratch height h2 considering the deposits 108, may be used as the scratch depth for the judgment of whether they are good or bad. This takes into account the gap that may occur between the sealing surface 17 and the gasket contact surface when the flange is tightened due to the deposits 108, and provides a judgment that more considers the impact of leakage. 【0219】 In this way, deposits and scratches 110 recognized as flange abnormalities may be considered as connected regardless of their shape (lines, points, etc.). Connected scratches 110 can be judged as good or bad based on the maximum scratch height h1 of each connected scratch. If deposits 108 are adjacent, the judgment of good or bad can also be made based on the scratch height h2, which is the gap between the height h3 of the deposit 108 and the maximum scratch height h2, taking the deposit 108 into account. 【0220】 Furthermore, if the sealing surface 17 is corroded or abraded by fluids from equipment operation, surface irregularities may occur, as shown in Figure 27C. In such cases, as described above, multiple irregularities can be integrated and judged as a single scratch 110 or scratch area. 【0221】 <Judgment on the changes in parameter values ​​D1 and D2> As shown in the trend chart T-11 (Figure 19), the parameter value D1 asymptotically approaches a predetermined damage limit Dmax over time (= elapsed time t). The flange recovers when repairs such as cutting are performed at the optimal repair time tf, which is before the damage limit Dmax is reached, and then approaches the damage limit Dmax again. 【0222】 Trend chart T-11 also shows parameter value D2. Parameter value D2 is the range of repairable areas where machining is possible. Trend chart T-11 is generated by combining parameter value D1 and parameter value D2, with one parameter being the amount of flange strain, damage, or maximum damage depth that can be recovered by machining, and the other parameter being the range of repairable areas that affects whether machining can be performed. Note that parameter value D1 is not displayed as a single line selected from each parameter such as flange strain, damage, or maximum depth, but rather lines for various parameters are displayed, and if any of them exceed the acceptable damage limit, server 104 determines that repair is necessary. 【0223】 <Repairable range of the sealing surface 17 by cutting> The range of the seal surface 17 that can be cut and repaired is the height to which the seal surface 17 can be cut for repair. If the flange has a shape in which the seal surface 17 protrudes like an RF (Raised Face) seat, as shown in Figure 1, the height of the seat portion of the seal surface 17 will decrease due to cutting, so the cuttable range where the seat of the seal surface 17 disappears becomes the cutting limit. In other words, the range of the seal surface 17 that can be cut and repaired is the height of the flat surface of the seal surface 17 that protrudes from the flange. 【0224】 Furthermore, if the sealing surface 17 is an FF (Flat Face) seat, for example, the flange thickness considering the flange strength from the gasket clamping force may be calculated in reverse and used as the cutting limit. In this case, the range of repairable cutting is the flange thickness that can ensure flange strength capable of withstanding the gasket clamping force. In this case, the repairable limit is the lower limit of the flange thickness that can ensure flange strength capable of withstanding the gasket clamping force. This is because FF seats tend to have very high gasket clamping forces, and repair may involve cutting the entire flange surface, which is expected to result in the clamping force required to enable the gasket to perform its sealing function exceeding the flange strength. 【0225】 Flanges come in various forms. For example, grooved flanges like the tongue-and-groove seat shown in Figure 28A, and snap-in flanges shown in Figure 28B, have a recessed seal surface 17. In this case, the seal surface 17 can be repaired by machining, but depending on the amount of machining (e.g., machining depth) of the seal surface 17, it is expected that the compression amount will be such that the gasket will not be able to perform its sealing function even when tightened until metal-to-metal contact occurs. In this case, it is necessary to determine the machining limit based on the relationship between the compression amount and surface pressure of the gasket used. 【0226】 The repairable range of the sealing surface 17 approaches the repairable limit through machining. Therefore, the height of the machined sealing surface 17 may be detected from three-dimensional point cloud data, or it may be measured using a measuring instrument such as a dial gauge. In other words, the repairable range of the sealing surface 17 can be calculated from the actual machining length or the height before and after machining, or by measuring the height of the repaired flange again using methods such as 3D measurement or a dial gauge. If a flange is used after machining beyond the repairable range, the flange thickness will be reduced by machining beyond the seat, which may cause the flange to be more prone to deflection during fastening, or, if the seat is removed, may prevent proper compression of the gasket, potentially leading to leakage. 【0227】 Furthermore, if a flange is used after machining beyond the repairable range, the flange thickness will decrease due to machining beyond the seat, resulting in increased susceptibility to deformation such as deflection under bolt fastening stress, which can further accelerate flange deformation. In this case, flange replacement will be necessary. 【0228】 Depending on the usage of the equipment, flange repairs are generally carried out every few decades. Even with flange replacement, some parts are easy to replace while others are not. For example, if there is a machine side and a cover side, the machine side is difficult to repair because the equipment is already installed, while the cover side is easy to repair because it can be removed. On-site machining costs are generally high, and since the cover side can be transported to a machining plant for processing, it is relatively easy to repair or replace, while the machine side, as mentioned above, may be difficult to repair even after several decades. In short, repair costs become a challenge. 【0229】 <Trend chart T-12 including predicted parameter values> Figure 29 is an example of a trend chart T-12, in which the horizontal axis represents the elapsed time t(t1, t2, ...) and the vertical axis represents the parameter values ​​(measured values), including the predicted parameter values ​​over time. The same parts as in Figure 19 are denoted by the same symbols. 【0230】 Server 104 predicts parameter values ​​based on the trend of measured parameter values. In this case, Server 104 acquires various parameter values ​​during each periodic maintenance and calculates the parameter values ​​by approximating, for example, three or more points. In this case, multiple parameters may be listed, similar to regression analysis, and their influences may be evaluated based on their degree of correlation. 【0231】 In trend chart T-12, the parameter value D1 approaches the damage limit over time, reaching a point just before the damage limit (= optimal repair timing tf). If machining repair is performed again at this optimal repair timing tf, the range of machining repairable will reach the repairable limit. Therefore, trend chart T-12 indicates that timing T1 is the optimal time for equipment replacement based on flange strain, damage amount, or maximum damage depth. 【0232】 <Trend Chart T-21> Figure 30 shows an example of another trend chart T-21 using measured parameter values ​​over time, with the horizontal axis representing elapsed time t(t1, t2, ...) and the vertical axis representing parameter values ​​(measured values). In this trend chart T-21, the other parameter value Sp represents the smallest surface pressure value at the seal surface 17. The surface pressure value decreases as the outer diameter of the flange deflects due to aging deterioration of the flange. For example, analysis using the Finite Element Method (FEM) can be used to analyze such three-dimensional point cloud data. The trend of the parameter value Sp approaches a predetermined seal surface pressure limit Spmin over time, and the seal surface 17 recovers when machining repair is performed just before reaching the seal surface pressure limit Spmin, after which the seal surface approaches the damage limit again. 【0233】 In trend chart T-21, the parameter value Maintenance / Repair Cost M represents the cost incurred for repairing the flange. Trend chart T-21 is generated by combining one parameter value, Sp, with the other parameter value, Maintenance / Repair Cost M, which affects whether or not the machining repair can be performed. Maintenance / Repair Cost M asymptotically approaches the cumulative maintenance / repair cost limit Mmax as machining repairs are performed. The cumulative maintenance / repair cost limit Mmax is the upper limit of the cumulative maintenance and repair costs that can be paid for a given piece of equipment. 【0234】 <Trend chart T-22 including predicted parameter values> Figure 31 is an example of a trend chart T-22, in which the horizontal axis represents the elapsed time t(t1, t2, ...) and the vertical axis represents the parameter value (measured value), including the predicted parameter value based on the number of years elapsed. In the trend chart T-22, the amount of surface pressure reduction is predicted to reach the seal surface pressure limit at the optimal repair time tf. If cutting repair is performed again at this optimal repair time tf, the maintenance / repair cost M is predicted to exceed the cumulative maintenance and repair cost limit Mmax. Therefore, the trend chart T-22 indicates that timing T2 is the optimal time for equipment replacement based on the surface pressure value. 【0235】 Server 104 generates trend charts T-12 and T-22 for the flange based on multiple different parameter values. If the optimal equipment replacement timings in the respective trend charts T-12 and T-22 differ, Server 104 determines the earlier timing as the optimal equipment replacement timing for the flange. For example, if the optimal equipment replacement timing differs from the timing T2 which is the optimal equipment replacement timing, Server 104 predicts the earlier optimal equipment replacement timing as the flange's lifespan. In this way, Server 104 can obtain diagnostic information indicating the flange's lifespan. Based on the trend charts T-21 and T-22, Server 104 can then predict the future state of the flange. 【0236】 The life prediction system 100 may be configured to provide diagnostic information to a facility manager such as the owner of the flange, for example. Hereinafter, the diagnostic information or diagnostic information sheet provided to the customer is also referred to as a flange chart. The flange chart indicates the life of the flange. The flange chart includes trend charts T-11, T-12, T-21, and T-22 that include predicted parameter values. A customer including a flange manager such as the owner of the flange can take preventive measures such as repair and budget for flange replacement based on the predicted life of the flange. 【0237】 <Effect of the Fifth Embodiment> According to this fifth embodiment, any of the following effects can be obtained. (1) It is possible to acquire state data of the seal surface of the flange in synchronization with the maintenance time, evaluate the amount of damage to the flange or the seal surface 17 from two or more state data, and acquire transition information of the state data. 【0238】 (2) From the transition of the state data, it is possible to predict damage to the flange or the seal surface 17, predict the optimal time for repair, predict the cutting amount of the seal surface 17, predict maintenance / repair costs, predict the seal surface pressure value, predict the optimal time for equipment replacement, etc. A trend chart can be created and provided to the user as a flange chart including trend data. 【0239】 (3) Along with optimizing the repair time of the flange fastening body, it is possible to provide the optimal time for new equipment procurement, and a highly reliable flange fastening body management system can be constructed. 【0240】 <Supplementary Note> Regarding an example of the characteristic matters extracted from the matters disclosed in this fifth embodiment, they are described below as Supplementary Notes 1 to Supplementary Note 8 in accordance with the claims. The present disclosure is not limited to such descriptions. 【0241】 (Supplementary Note 1) A state data acquisition unit that acquires state data indicating the state of a component two or more times at specific time intervals, A prediction unit predicts the state transition of a component based on the acquired state data, Based on the above prediction, an information display unit presents diagnostic information or lifespan prediction information indicating the lifespan of the component, A life prediction system characterized by comprising the following features. 【0242】 (Note 2) A lifespan prediction system according to Appendix 1, characterized in that it predicts the lifespan of a component based on a limit condition representing the limit of repair of the component and a trend (e.g., a long-term change trend) of predetermined parameter values ​​indicating a specific state of the component. 【0243】 (Note 3) The life prediction system described in Appendix 2 predicts the timing of the end of life, which is the time when the parameter value reaches or approaches the limit condition after repeated repairs of the aforementioned part. 【0244】 (Note 4) The life prediction system described in Appendix 2, characterized in that the parameter values ​​represent the amount of distortion, damage, or maximum depth of the flange, and the limit conditions represent the range within which cutting repair is possible. 【0245】 (Note 5) The life prediction system according to Appendix 2, characterized in that the parameter value is the sealing surface pressure and the limit condition represents the cumulative maintenance and repair costs. 【0246】 (Note 6) The life prediction system described in Appendix 1, characterized by acquiring multiple trends (long-term change trends) of different types of parameter values ​​for a single component, and predicting the earliest year of the limit among them as the life of the component. 【0247】 (Note 7) The lifespan prediction system according to Appendix 1, characterized in that the information display unit displays a trend chart along with the lifespan of the component. 【0248】 (Note 8) A state data acquisition process that acquires state data indicating the state of a component two or more times at specific time intervals, A prediction process that predicts the state changes of the component based on the acquired state data, An information presentation step that presents diagnostic information or lifespan prediction information indicating the lifespan of the component based on the above prediction, A method for predicting lifespan, characterized by including the following: 【0249】 [Other embodiments] Embodiments of this disclosure include the following modifications: (1) A database is provided that stores one or more of the repair details, repair timing, or repair costs of flanges related to the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction. Alternatively, a database may be used that stores one or more of the repair details, repair timing, or repair costs of flanges related to one or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction. 【0250】 (2) A database storing one or more of the details of flange repair, the timing of repair, or the cost of repair may be related to two or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, and one or more of the details of flange repair, the timing of repair, or the cost of repair may be selected from the database based on these two or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction. 【0251】 As described above, the most preferred embodiments of the diagnostic method, diagnostic system, and program of this disclosure have been described. However, this disclosure is not limited to the above, and various modifications and changes are possible for those skilled in the art based on the gist of the invention as described in the claims or disclosed in forms for carrying out the invention. It goes without saying that such modifications and changes are within the scope of this disclosure. [Industrial applicability] 【0252】 According to the present disclosure, it is possible to provide a diagnostic method, a diagnostic system, and a program that can present repair contents in accordance with the deterioration state of the flange surface without depending on the technical knowledge and experience of an operator. It is possible to calculate any one or two or more of the surface pressure reduction amount, the surface pressure reduction width, the surface pressure reduction rate, or the surface pressure reduction speed from the surface pressure range obtained from the flange, and select any one or two or more of the repair contents, the repair time, or the repair cost related to any one or two or more of the surface pressure reduction amount, the surface pressure reduction width, the surface pressure reduction rate, or the surface pressure reduction speed to realize the maintenance content, and thus beneficial effects can be obtained. 【0253】 Further, according to the present disclosure, it is possible to predict the life of the flange surface from the state data representing the deterioration state of the flange surface, provide trend data including a trend chart of the seal surface, and realize proper flange fastening management. 【Explanation of Reference Numerals】 【0254】 2 Flange fastening body 4-1, 4-2 Pipeline 6-1, 6-2 Flange 8 Gasket 10 Bolt 12 Nut 14 Fluid 16 Flange surface 17 Seal surface 18 Diagnostic system 20 Bolt through-hole 22 3D scanner 24 Diagnostic device 26 Operator 28 Diagnostic processing unit 30 Information presentation unit 32 Processor 34 Memory 36 Input / output unit (I / O) 38 First database 40, 54 Date and time unit 42 Flange part 44, 64 Surface pressure range part 46 Repair content part 48 Repair time part 50 Cost part 52 Second Database 56 Equipment and Plant Information Department 58 Design Information Department 60. Operation Information Department 62 Flange fastening section 66. Diagnostic Results Department 68. General Evaluation Department 70, 72 Welds 74, 74-1, 74-2 Surface pressure range 76-1, 76-2 Uneven part 100 Life Prediction System 102 Terminal device 104 Servers 106 Network 108 Attached substances 110 wounds 112 Inner circumference 114 Outer perimeter 116 Sectoral section

Claims

[Claim 1] A diagnostic method for diagnosing the flange of a flange fastening, The surface pressure range measurement unit measures the surface pressure range with respect to the gasket using three-dimensional point cloud data of the flange surface, The diagnostic unit performs a step of comparing the surface pressure range before and after deterioration and calculating one or more of the surface pressure reduction amount, surface pressure reduction width, surface pressure reduction rate, or surface pressure reduction rate, The diagnostic unit includes the step of selecting from a database storing repair details, repair timing, or repair costs of a flange related to any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, the repair details, repair timing, or repair costs that are specified by any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, the repair details, repair timing, or repair costs that are specified by any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, The presentation unit includes a step of presenting a diagnostic result that includes one or more of the repair details, the repair timing, or the repair cost, Diagnostic methods, including those mentioned above. [Claim 2] The diagnostic unit includes the step of measuring the radial surface pressure width of the flange surface from the surface pressure range, The diagnostic unit performs the steps of comparing the surface pressure width before and after deterioration and calculating the surface pressure reduction amount, The diagnostic method according to claim 1, including the method described in claim 1. [Claim 3] Furthermore, the diagnostic unit includes the step of measuring the surface pressure width at at least one location in the surface pressure range before deterioration and at least two locations in the radial direction of the surface pressure range after deterioration, The diagnostic unit performs the steps of comparing the surface pressure width before and after deterioration and calculating the surface pressure reduction width, The diagnostic method according to claim 2, including the method described in claim 2. [Claim 4] The diagnostic method according to claim 1, wherein the repair work includes any or more of the following: adjustment of the flange surface in relation to the amount of surface pressure reduction, resetting of the tightening axial force, or replacement of the flange. [Claim 5] Furthermore, the diagnostic method according to claim 4, wherein the diagnostic unit includes a cost calculation step for calculating the repair costs, and in this cost calculation step, the costs necessary for resetting the tightening axial force, increasing or decreasing the tightening axial force, adjusting the flange surface, or replacing the flange are calculated. [Claim 6] A diagnostic system for diagnosing the flange of a flange fastening, A surface pressure range measuring unit that measures the surface pressure range with the gasket from three-dimensional point cloud data of the flange surface, A diagnostic unit that compares the surface pressure range before and after deterioration to calculate the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, and selects from a database that stores repair details, repair timing, or repair costs of the flange related to any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, any or more of the repair details, repair timing, or repair costs specified by any or more of the amount of surface pressure reduction, the width of surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction, and A display unit that presents a diagnostic result including one or more of the repair details, the repair timing, or the repair costs, A diagnostic system that includes this. [Claim 7] A program to be executed by a computer, A function to measure the surface pressure range with the gasket from three-dimensional point cloud data of the flange surface, A function to calculate the amount of surface pressure reduction, the width of the surface pressure reduction, the rate of surface pressure reduction, or the rate of surface pressure reduction by comparing the surface pressure range before and after deterioration, A function to select from a database storing repair details, repair timing, or repair costs of a flange related to any or more of the surface pressure reduction amount, surface pressure reduction width, surface pressure reduction rate, or surface pressure reduction rate, the repair details, repair timing, or repair costs specified by any or more of the surface pressure reduction amount, surface pressure reduction width, surface pressure reduction rate, or surface pressure reduction rate, A function to output presentation information representing the diagnostic results, which includes one or more of the repair details, the repair timing, or the repair costs. A program to cause the aforementioned computer to execute.

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