Flange bolt tightening torque determination method, system, electronic device and storage medium

Abstract

The present invention discloses a method, system, electronic device and storage medium for determining the tightening torque of flange bolts, and relates to the technical field of bolt torque calculation; obtaining the minimum stress and maximum stress of the bolt, ensuring that the target bolt stress is within the lower limit control range and within the upper limit control range; ensuring that the target bolt stress is within the maximum stress control range allowed by the flange; judging whether the target bolt stress meets the requirements during installation; judging whether the target bolt stress meets the requirements during operation; judging whether the target bolt stress meets the requirements when the gasket is not damaged; judging whether the target bolt stress meets the requirements based on the maximum allowable rotation angle of the gasket and the rotation angle of the flange; obtaining the tightening torque of each bolt of the flange based on the nut coefficient, the bolt root diameter and the single bolt root diameter area, and the final target bolt stress. The present invention can ensure the absolute sealing of the flange connection joint when the gasket is not damaged and the flange is not deflected and deformed.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt torque calculation, and in particular to a method, system, electronic device and storage medium for determining the tightening torque of a flange bolt. Background Art

[0002] With the vigorous development of new energy and gas-fired power generation technologies, chemical machinery and equipment are increasingly widely used in this field. In these devices, flanges, as the core components connecting pressure pipes and valves, not only bear the connection function, but also serve as the key channel for replacing internal components. The flange connection system is usually composed of gaskets and bolts. The precise torque value applied to the bolts by the torque wrench can achieve tight sealing and effectively prevent leakage problems. However, the sealing performance of the flange connection directly depends on the torque value setting of the bolts: if the torque is too small, the seal is insufficient and it is easy to cause leakage; if the torque is too large, it may cause deformation and failure of the flange or bolts, and there is also a risk of leakage. Therefore, it is particularly important to accurately calculate and set a reasonable bolt tightening torque value.

[0003] However, the current commonly used method for determining torque value has the following significant problems:

[0004] 1. Existing methods often consider the performance parameters of a single bolt in isolation and fail to comprehensively evaluate the flange connection system as a whole. This limitation limits the accuracy and effectiveness of torque value setting.

[0005] 2. During the bolt tightening process, the flange may deflect and deform due to uneven force. This factor has an important impact on the sealing performance, but the current method fails to fully consider this variable, making the sealing effect difficult to predict and control.

[0006] 3. As a key component of the sealing system, the gasket's collapse or damage will directly threaten the integrity of the seal. Summary of the invention

[0007] The purpose of the present invention is to propose a method, system, electronic device and storage medium for determining the tightening torque of flange bolts, wherein the determined bolt preload can ensure the absolute sealing of the flange connection joint when the gasket is not damaged and the flange is not deflected or deformed.

[0008] According to a first aspect of an embodiment of the present disclosure, a method for determining a flange bolt tightening torque is provided, comprising the following steps:

[0009] According to the inner diameter of the gasket contact surface G ID Outer diameter of the contact surface with the gasket G 0D , get the gasket contact area Ag ; Get the gasket target stress S1 , which is provided by the gasket supplier; based on the gasket contact area Ag , Gasket target stress S 1 , single bolt root diameter area A b and number of bolts n b , get the target bolt stress S ;

[0010] Get the minimum bolt stress S 2 and maximum bolt stress S 3 , which is generally 30% to 80% of the yield strength of the bolt material at room temperature; to ensure the target bolt stress S Within the lower control limit, S = MAX(S, S 2 ) ; To ensure the target bolt stress S Within the upper control range, S = MIN(S, S 3 ) ;

[0011] Get the maximum bolt stress when the flange is not damaged S 4 , this parameter is provided by the flange supplier; to ensure the target bolt stress S Within the maximum stress control range allowed by the flange, S = MIN(S, S 4 ) ;

[0012] Get the minimum gasket seal stress during installation S 5 Minimum gasket seal stress during operation S 6 , these two parameters are provided by the gasket supplier; determine the target bolt stress during installation S Whether the requirements are met, if not, readjust;

[0013] Obtaining gasket residual stress coefficient , generally take =0.7; based on the minimum seal stress of the gasket during operation S 6 , Gasket contact area Ag , Design pressure P , Inner diameter of gasket contact surface G ID , Gasket residual stress coefficient , single bolt root diameter area A b and number of boltsn b , determine the target bolt stress during operation S Whether the requirements are met, if not, readjust;

[0014] Get the maximum allowable stress of the gasket S 7 , which is provided by the gasket supplier; the target bolt stress when the gasket is not damaged is S Whether the requirements are met, if not, readjust;

[0015] Determine the maximum allowable rotation angle of the gasket at the operating temperature , general PTFE and other non-metallic materials Take 0.3°, graphite wound gasket 1.0° can be taken; determine the maximum stress in the bolt S 4 Flange rotation angle when the lower flange is not damaged , this parameter is provided by the flange supplier; based on the maximum allowable rotation angle of the gasket 、Flange angle , determine the target bolt stress S Whether the requirements are met, if not, redetermine the target bolt stress S Readjust the target bolt stress within the maximum stress control range allowed by the flange. S ;

[0016] Determine the nut factor K , generally when there is lubrication and no friction K=0.20 , when there is friction without lubrication K=0. 16; Based on nut factor K , bolt root diameter and the root diameter area of ​​a single bolt A b , and the final target bolt stress S , obtain the tightening torque of each bolt of the flange.

[0017] In one embodiment, the gasket contact area Ag The method of obtaining is:

[0018]

[0019] The target bolt stress S The method of obtaining is:

[0020]

[0021] In one embodiment, the method for determining whether the bolt stress meets the requirements during installation is:

[0022]

[0023] In one embodiment, the method for determining whether the bolt stress meets the requirement during operation is:

[0024]

[0025] In one embodiment, the method for determining whether the target bolt stress S meets the requirement when the gasket is not damaged is:

[0026]

[0027] In one embodiment, based on the maximum allowable rotation angle of the gasket 、Flange angle , the method to judge whether the target bolt stress S meets the requirements is:

[0028]

[0029] In one embodiment, the tightening torque of each bolt is obtained as follows:

[0030]

[0031] According to a second aspect of an embodiment of the present disclosure, a flange bolt tightening torque determination system is provided, comprising:

[0032] Bolt stress determination module, based on the inner diameter of the gasket contact surface G ID Outer diameter of the contact surface with the gasket G 0D , get the gasket contact area Ag ; Then obtain the gasket target stress S 1 , based on the gasket contact area Ag , Gasket target stress S 1 , single bolt root diameter area A b and number of bolts n b , get the target bolt stress S ;

[0033] Range control module, obtain the minimum bolt stress S 2 and maximum bolt stress S 3 ; To ensure the target bolt stress S Within the lower control limit, S = MAX(S, S 2 ) ; To ensure the target bolt stress SWithin the upper control range, S = MIN(S, S 3 ) ;

[0034] Maximum stress control module, to obtain the maximum bolt stress when the flange is not damaged S 4 To ensure that the target bolt stress S is within the maximum stress control range allowed by the flange, take S = MIN(S, S 4 ) ;

[0035] The first judgment adjustment module obtains the minimum seal stress of the gasket during installation S 5 Minimum gasket seal stress during operation S 6 , determine the target bolt stress during installation S Whether the requirements are met, if not, readjust;

[0036] The second judgment adjustment module obtains the gasket residual stress coefficient , according to the minimum gasket sealing stress during operation S 6 , Gasket contact area Ag , Design pressure P , Inner diameter of gasket contact surface G ID , Gasket residual stress coefficient , single bolt root diameter area A b and number of bolts n b , determine the target bolt stress during operation S Whether the requirements are met, if not, readjust;

[0037] The third judgment adjustment module obtains the maximum allowable stress of the gasket S 7 , to determine the target bolt stress when the gasket is not damaged S Whether the requirements are met, if not, readjust;

[0038] The fourth judgment and adjustment module determines the maximum allowable rotation angle of the gasket at the operating temperature , and then determine the maximum stress in the bolt S 4 Flange rotation angle when the lower flange is not damaged , based on the maximum allowable rotation angle of the gasket 、Flange angle , determine the target bolt stress S Whether the requirements are met, if not, redetermine the target bolt stressS Readjust the target bolt stress within the maximum stress control range allowed by the flange. S ;

[0039] Tightening torque acquisition module to determine the nut coefficient K , based on the nut factor K , bolt root diameter and the root diameter area of ​​a single bolt A b , and the final target bolt stress S , obtain the tightening torque of each bolt of the flange.

[0040] According to a third aspect of an embodiment of the present disclosure, an electronic device is provided, including a memory, a processor, and a computer program stored and running on the memory, wherein the method for determining the tightening torque of a flange bolt is implemented when the processor executes the program.

[0041] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method for determining the tightening torque of a flange bolt is implemented.

[0042] Compared with the prior art, the above technical solution adopted by the present invention has the following advantages:

[0043] In order to ensure the integrity of the flange structure and optimize its sealing, the present invention controls the stress of the bolts and gaskets and the deflection angle of the flange, and verifies the bearing capacity of each component to determine the tightening torque of each bolt. Under the condition that the gasket remains intact and the flange structure is stable without deflection and deformation, it can ensure that the flange connection joint achieves an absolute sealing effect, thereby further improving the safety and reliability of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0045] Figure 1 The present invention is a flow chart of a method for determining the tightening torque of flange bolts. DETAILED DESCRIPTION

[0046] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] It should be noted that the flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the methods and systems according to various embodiments of the present disclosure. It should be noted that each box in the flowchart or block diagram can represent a module, a program segment, or a part of a code, and the module, program segment, or a part of a code may include one or more executable instructions for implementing the logical functions specified in each embodiment. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the flowchart and / or block diagram, and the combination of boxes in the flowchart and / or block diagram can be implemented using a dedicated hardware-based system that performs a specified function or operation, or can be implemented using a combination of dedicated hardware and computer instructions.

[0050] Embodiment 1: This embodiment provides a method for determining the tightening torque of a flange bolt, comprising the following steps:

[0051] Step 1: According to the inner diameter of the gasket contact surface G ID Outer diameter of the contact surface with the gasket G 0D , get the gasket contact area Ag ; Then obtain the gasket target stress S 1 , based on the gasket contact area Ag , Gasket target stress S 1 , single bolt root diameter area A b and number of bolts n b , get the target bolt stress S ;

[0052] Assumption: Flange system design pressure P =4.5MPa; the gasket model is graphite spiral wound gasket, the inner diameter of the gasket contact surface G ID =725mm, outer diameter of gasket contact surface G 0D =775mm, gasket target stress S 1 =200MPa, flange system is equipped with 35CrMoA material and nominal diameter M27 bolts, number of bolts n b =36, bolt root diameter =24.19mm, single bolt root diameter area A b =459.4mm 2 , minimum bolt stress S 2 =335MPa, maximum bolt stress S 3 =580MPa, maximum bolt stress without flange damage S 4 =510MPa, minimum gasket sealing stress during installation S 5 =69MPa, minimum gasket sealing stress during operation S 6 =13.5MPa, Maximum allowable stress of gasket S 7 =276MPa, gasket residual stress coefficient =0.7, the maximum allowable rotation angle of the gasket at the operating temperature =1.0º, flange rotation angle when the flange does not fail under maximum bolt stress =0.32º, nut coefficient K =0.20.

[0053] Based on the above assumptions, the gasket contact area

[0054]

[0055] =0.785×(7752-7252)=58875mm 2 ;

[0056] Based on the above assumptions, the target bolt stress

[0057] =200×(58875 / 459.4×36)=712MPa;

[0058] Step 2: Obtain the minimum bolt stress S 2 and maximum bolt stress S 3 ; To ensure the target bolt stress SWithin the lower control limit, based on the above assumptions, S = MAX(S, S 2 ) = MAX (712,335)=712MPa; To ensure the target bolt stress S Within the upper control range, S = MIN(S, S 3 ) = MIN (712,580)=580MPa;

[0059] Step 3: Obtain the maximum bolt stress without flange damage S 4 To ensure the target bolt stress S Within the maximum stress control range allowed by the flange, S = MIN(S, S 4 ) = MIN (580,510)=510MPa;

[0060] Step 4: Obtain the minimum gasket seal stress during installation S 5 Minimum gasket seal stress during operation S 6 , determine the target bolt stress during installation S Whether it meets the requirements, if not, readjust it, such as changing the gasket model;

[0061]

[0062] = ,

[0063] because S =510MPa>245.7MPa, which meets the above restrictions, so continue to the next step;

[0064] Step 5: Obtain gasket residual stress coefficient , according to the minimum gasket sealing stress during operation S 6 , Gasket contact area Ag , Design pressure P , Inner diameter of gasket contact surface G ID , Gasket residual stress coefficient , single bolt root diameter area A b and number of bolts n b , determine the target bolt stress during operation S Whether it meets the requirements, if not, readjust it, such as changing the gasket model;

[0065]

[0066]

[0067] Since S=510MPa>229.3MPa, the above restrictions are met, so continue to the next step;

[0068] Step 6: Obtain the maximum allowable stress of the gasket S 7 , to determine the target bolt stress when the gasket is not damaged S Whether it meets the requirements, if not, readjust it, such as changing the gasket model;

[0069]

[0070]

[0071] Since S=510MPa<982.5MPa, the above restrictions are met, so continue to the next step;

[0072] Step 7: Determine the maximum allowable rotation angle of the gasket at the operating temperature , and then determine the maximum stress in the bolt S 4 Flange rotation angle when the lower flange is not damaged , based on the maximum allowable rotation angle of the gasket 、Flange angle , determine the target bolt stress S Whether the requirements are met, if not, redetermine the target bolt stress S Readjust the target bolt stress within the maximum stress control range allowed by the flange. S , such as changing the gasket model;

[0073]

[0074] Since S=510MPa<1594MPa, the above restriction conditions are met. After the above steps of calculation and judgment, the final target bolt stress is determined to be S=510MPa;

[0075] Step 8: Determine the nut factor K , based on the nut factor K , bolt root diameter and the root diameter area of ​​a single bolt A b , and the final target bolt stress S , obtain the tightening torque of each bolt of the flange.

[0076]

[0077] Therefore, the tightening torque of a single bolt of this flange is 1134 .

[0078] Embodiment 2: This embodiment provides a flange bolt tightening torque determination system, including:

[0079] Bolt stress determination module, based on the inner diameter of the gasket contact surface G ID Outer diameter of the contact surface with the gasket G 0D , get the gasket contact area Ag ; Then obtain the gasket target stress S 1 , based on the gasket contact area Ag , Gasket target stress S 1 , single bolt root diameter area A b and number of bolts n b , get the target bolt stress S ;

[0080] Range control module, obtain the minimum bolt stress S 2 and maximum bolt stress S 3 ; To ensure the target bolt stress S Within the lower control limit, S = MAX(S, S 2 ) ; To ensure the target bolt stress S Within the upper control range, S = MIN(S, S 3 ) ;

[0081] Maximum stress control module, to obtain the maximum bolt stress when the flange is not damaged S 4 To ensure the target bolt stress S Within the maximum stress control range allowed by the flange, S = MIN(S, S 4 ) ;

[0082] The first judgment adjustment module obtains the minimum seal stress of the gasket during installation S 5 Minimum gasket seal stress during operation S 6 , determine the target bolt stress during installation S Whether the requirements are met, if not, readjust;

[0083] The second judgment adjustment module obtains the gasket residual stress coefficient , according to the minimum gasket sealing stress during operation S 6 , Gasket contact area Ag , Design pressure P , Inner diameter of gasket contact surface G ID , Gasket residual stress coefficient , single bolt root diameter area A b and number of bolts n b , determine the target bolt stress during operation S Whether the requirements are met, if not, readjust;

[0084] The third judgment adjustment module obtains the maximum allowable stress of the gasket S 7 , to determine the target bolt stress when the gasket is not damaged S Whether the requirements are met, if not, readjust;

[0085] The fourth judgment and adjustment module determines the maximum allowable rotation angle of the gasket at the operating temperature , and then determine the maximum stress in the bolt S 4 Flange rotation angle when the lower flange is not damaged , based on the maximum allowable rotation angle of the gasket 、Flange angle , determine the target bolt stress S Whether the requirements are met, if not, redetermine the target bolt stress S Readjust the target bolt stress within the maximum stress control range allowed by the flange. S ;

[0086] Tightening torque acquisition module to determine the nut coefficient K , based on the nut factor K , bolt root diameter and the root diameter area of ​​a single bolt A b , and the final target bolt stress S , obtain the tightening torque of each bolt of the flange.

[0087] Embodiment 3: An electronic device includes a memory, a processor, and a computer program stored and running on the memory, wherein the processor implements the above-mentioned method for determining the tightening torque of flange bolts when executing the program, including:

[0088] According to the inner diameter of the gasket contact surface G IDOuter diameter of the contact surface with the gasket G 0D , get the gasket contact area Ag ; Then obtain the gasket target stress S 1 , based on the gasket contact area Ag , Gasket target stress S 1 , single bolt root diameter area A b and number of bolts n b , get the target bolt stress S ;

[0089] Get the minimum bolt stress S 2 and maximum bolt stress S 3 ; To ensure the target bolt stress S Within the lower control limit, S = MAX(S, S 2 ) ; To ensure the target bolt stress S Within the upper control range, S = MIN(S, S 3 ) ;

[0090] Get the maximum bolt stress when the flange is not damaged S 4 To ensure that the target bolt stress S is within the maximum stress control range allowed by the flange, take S = MIN(S, S 4 ) ;

[0091] Get the minimum gasket seal stress during installation S 5 Minimum gasket seal stress during operation S 6 , determine the target bolt stress during installation S Whether the requirements are met, if not, readjust;

[0092] Obtaining gasket residual stress coefficient , according to the minimum gasket sealing stress during operation S 6 , Gasket contact area Ag , Design pressure P , Inner diameter of gasket contact surface G ID , Gasket residual stress coefficient , single bolt root diameter area A b and number of bolts nb , determine the target bolt stress during operation S Whether the requirements are met, if not, readjust;

[0093] Get the maximum allowable stress of the gasket S 7 , to determine the target bolt stress when the gasket is not damaged S Whether the requirements are met, if not, readjust;

[0094] Determine the maximum allowable rotation angle of the gasket at the operating temperature , and then determine the maximum stress in the bolt S 4 Flange rotation angle when the lower flange is not damaged , based on the maximum allowable rotation angle of the gasket 、Flange angle , determine the target bolt stress S Whether the requirements are met, if not, redetermine the target bolt stress S Readjust the target bolt stress within the maximum stress control range allowed by the flange. S ;

[0095] Determine the nut factor K , based on the nut factor K , bolt root diameter and the root diameter area of ​​a single bolt A b , and the final target bolt stress S , obtain the tightening torque of each bolt of the flange.

[0096] Embodiment 4: A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for determining the tightening torque of a flange bolt, comprising:

[0097] According to the inner diameter of the gasket contact surface G ID Outer diameter of the contact surface with the gasket G 0D , get the gasket contact area Ag ; Then obtain the gasket target stress S 1 , based on the gasket contact area Ag , Gasket target stress S 1 , single bolt root diameter area A b and number of bolts n b , get the target bolt stress S ;

[0098] Get the minimum bolt stressS 2 and maximum bolt stress S 3 ; To ensure the target bolt stress S Within the lower control limit, S = MAX(S, S 2 ) ; To ensure the target bolt stress S Within the upper control range, S = MIN(S, S 3 ) ;

[0099] Get the maximum bolt stress when the flange is not damaged S 4 To ensure that the target bolt stress S is within the maximum stress control range allowed by the flange, take S = MIN(S, S 4 ) ;

[0100] Get the minimum gasket seal stress during installation S 5 Minimum gasket seal stress during operation S 6 , determine the target bolt stress during installation S Whether the requirements are met, if not, readjust;

[0101] Obtaining the gasket residual stress coefficient , according to the minimum gasket sealing stress during operation S 6 , Gasket contact area Ag , Design pressure P , Inner diameter of gasket contact surface G ID , Gasket residual stress coefficient , single bolt root diameter area A b and number of bolts n b , determine the target bolt stress during operation S Whether the requirements are met, if not, readjust;

[0102] Get the maximum allowable stress of the gasket S 7 , to determine the target bolt stress when the gasket is not damaged S Whether the requirements are met, if not, readjust;

[0103] Determine the maximum allowable rotation angle of the gasket at the operating temperature , and then determine the maximum stress in the bolt S 4 Flange rotation angle when the lower flange is not damaged , based on the maximum allowable rotation angle of the gasket 、Flange angle , determine the target bolt stress S Whether the requirements are met, if not, redetermine the target bolt stress S Readjust the target bolt stress within the maximum stress control range allowed by the flange. S ;

[0104] Determine the nut factor K , based on the nut factor K , bolt root diameter and the root diameter area of ​​a single bolt A b , and the final target bolt stress S , obtain the tightening torque of each bolt of the flange.

[0105] Those skilled in the art should understand that the modules or steps of the present disclosure can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present disclosure is not limited to any specific combination of hardware and software.

[0106] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0107] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A method for determining the tightening torque of flange bolts, characterized in that: The following steps are involved: According to the inner diameter of the gasket contact surface G ID Outer diameter of the contact surface with the gasket G 0D , get the gasket contact area Ag ; Then obtain the gasket target stress S 1 , based on the gasket contact area Ag , Gasket target stress S 1 , single bolt root diameter area A b and number of bolts n b , get the target bolt stress S ; Get the minimum bolt stress S 2 and maximum bolt stress S 3 ; To ensure the target bolt stress S Within the lower control limit, S =MAX(S,S 2 ) ; To ensure the target bolt stress S Within the upper control range, S=MIN(S,S 3 ) ; Get the maximum bolt stress when the flange is not damaged S 4 To ensure that the target bolt stress S is within the maximum stress control range allowed by the flange, take S=MIN(S,S 4 ) ; Get the minimum gasket seal stress during installation S 5 Minimum gasket seal stress during operation S 6 , determine the target bolt stress during installation S Whether the requirements are met, if not, readjust; The method to judge whether the bolt stress meets the requirements during installation is: ； Obtaining gasket residual stress coefficient , according to the minimum gasket sealing stress during operation S 6 , Gasket contact area Ag , Design pressure P , Inner diameter of gasket contact surface G ID , Gasket residual stress coefficient , single bolt root diameter area A b and number of bolts n b , determine the target bolt stress during operation S Whether the requirements are met, if not, readjust; The method to judge whether the bolt stress meets the requirements during operation is: ； Get the maximum allowable stress of the gasket S 7 , to determine the target bolt stress when the gasket is not damaged S Whether the requirements are met, if not, readjust; The method for judging whether the target bolt stress S meets the requirement when the gasket is not damaged is: ； Determine the maximum allowable rotation angle of the gasket at the operating temperature , and then determine the maximum stress in the bolt S 4 Flange rotation angle when the lower flange is not damaged , based on the maximum allowable rotation angle of the gasket 、Flange angle , determine the target bolt stress S Whether the requirements are met, if not, redetermine the target bolt stress S Readjust the target bolt stress within the maximum stress control range allowed by the flange. S ; The method for judging whether the target bolt stress S meets the requirements is: ； Determine the nut factor K , based on the nut factor K , bolt root diameter and the root diameter area of ​​a single bolt A b , and the final target bolt stress S , obtain the tightening torque of each bolt of the flange.

2. The method for determining the tightening torque of flange bolts according to claim 1, characterized in that: The gasket contact area Ag The method of obtaining is: ； The target bolt stress S is obtained as follows: 。 3. The method for determining the tightening torque of flange bolts according to claim 1, characterized in that: The tightening torque of each bolt is obtained as follows: 。 4. Flange bolt tightening torque determination system, characterized in that: include: Bolt stress determination module, based on the inner diameter of the gasket contact surface G ID Outer diameter of the contact surface with the gasket G 0D , get the gasket contact area Ag ; Then obtain the gasket target stress S 1 , based on the gasket contact area Ag , Gasket target stress S 1 , single bolt root diameter area A b and number of bolts n b , get the target bolt stress S ; Range control module, obtain the minimum bolt stress S 2 and maximum bolt stress S 3 ; To ensure the target bolt stress S Within the lower control limit, S=MAX(S,S 2 ) ; To ensure the target bolt stress S Within the upper control range, S=MIN(S,S 3 ) ; Maximum stress control module, to obtain the maximum bolt stress when the flange is not damaged S 4 , to ensure the target bolt stress S Within the maximum stress control range allowed by the flange, S=MIN(S,S 4 ) ; The first judgment adjustment module obtains the minimum seal stress of the gasket during installation S 5 Minimum gasket seal stress during operation S 6 , determine the target bolt stress during installation S Whether the requirements are met, if not, readjust; The second judgment adjustment module obtains the gasket residual stress coefficient , according to the minimum gasket sealing stress during operation S 6 , Gasket contact area Ag , Design pressure P , Inner diameter of gasket contact surface G ID , Gasket residual stress coefficient , single bolt root diameter area A b and number of bolts n b , determine the target bolt stress during operation S Whether the requirements are met, if not, readjust; The third judgment adjustment module obtains the maximum allowable stress of the gasket S 7 , to determine the target bolt stress when the gasket is not damaged S Whether the requirements are met, if not, readjust; The fourth judgment and adjustment module determines the maximum allowable rotation angle of the gasket at the operating temperature , and then determine the maximum stress in the bolt S 4 Flange rotation angle when the lower flange is not damaged , based on the maximum allowable rotation angle of the gasket 、Flange angle , determine the target bolt stress S Whether the requirements are met, if not, redetermine the target bolt stress S Readjust the target bolt stress within the maximum stress control range allowed by the flange. S ; Tightening torque acquisition module to determine the nut coefficient K , based on the nut factor K , bolt root diameter and the root diameter area of ​​a single bolt A b , and the final target bolt stress S , obtain the tightening torque of each bolt of the flange.

5. An electronic device comprising a memory, a processor and a computer program stored and running on the memory, characterized in that: When the processor executes the program, the flange bolt tightening torque determination method according to any one of claims 1 to 3 is implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for determining the flange bolt tightening torque according to any one of claims 1 to 3 is implemented.

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