KR20230036064A - Gaskets, methods, systems and programs for their management - Google Patents

Abstract

The technique of the present disclosure provides outer cuts (4-1, 4-2, 4-3, 4-4), and the shape of the outer cut is changed by the load received by the restraining portion. The shape of the outer cut changed by receiving the load is measured, and the fastening of the gasket is managed based on the shape. In this way, it is possible to directly observe a change in the shape of the gasket subjected to a load between the flanges, and use the result of the observation to manage the gasket fastening, thereby improving the gasket and its management technology.

Description

Gaskets, methods, systems and programs for their management

The present disclosure relates to, for example, a gasket used for fastening of a piping system and a management technique thereof.

For the fastening of the gasket, the fastening torque or bolt axial force value applied to the flange by the bolt is traditionally used. The fastening torque or bolt axial force value is information about fastening bolts fastening between flanges.

Regarding the fastening of this gasket, a system is known that uses the fastening surface pressure corresponding to the type of gasket or internal fluid, a plurality of fastening forces, bolt information, etc. to determine the fastening torque (for example, Patent Document 1 ). Regarding the fastening of bolts, it is known to visualize the fastening state of bolts by converting distortion occurring in bolts into data (for example, Patent Literature 2).

Japanese Unexamined Patent Publication No. 2014-225219 Japanese Unexamined Patent Publication No. 2015-141345

By the way, the reason why bolt tightening torque and axial force values are used for gasket tightening management is that bolts are a means for fastening between flanges, and the tightening force from bolts can be easily grasped by measuring bolt twist. .

However, as a result of detailed investigation of the relationship between the bolt, the flange and the gasket, the fastening force of the bolt acts on the flange and only indirectly acts on the gasket through the flange. In short, the flange receives a load due to fastening of bolts, and this load merely acts on the gasket through the flange. The torque value or the axial force value applied to the bolt is a load acting on a part of the flange, and does not indicate the surface pressure acting on the gasket.

For this reason, there are the following problems in gasket tightening management.

a) The torque value or the axial force value acquired from the bolt is information about the bolt, and cannot be said to measure the surface pressure that the gasket receives.

b) From the surface pressure that the gasket receives from the flange, the torque value or axial force value of the bolt is only indirect information and only a measure of the surface pressure.

c) The torque value or axial force value of bolts is affected by the fastening condition of bolts or flanges, and this tendency to change cannot be ignored.

When the surface pressure of a gasket is estimated from the torque value or axial force value measured with a torque wrench or bolt axial force meter, the surface pressure applied to the gasket (= estimated surface pressure) and the surface pressure actually applied to the gasket when affected by the fastening state of the bolt or flange The relationship of (= face pressure) is

Estimated surface pressure ≠ real surface pressure

becomes Even if the measurement accuracy of the torque value or the axial force value is increased, the estimated surface pressure and the real surface pressure of the gasket do not match. It is not possible to determine the surface pressure that the gasket is subjected to.

In response to this problem, the inventors have found that the change in the shape of the gasket depends on the load applied from between the flanges, and that observing the change in shape is useful for managing the fastening of the gasket. Patent Documents 1 and 2 do not disclose or suggest such a subject. And with the structures disclosed in Patent Literatures 1 and 2, these problems cannot be solved.

Accordingly, an object of the present disclosure is to directly observe a change in the shape of a gasket subjected to a load between flanges based on the above problems and the above knowledge, and improve gaskets and management techniques thereof by using the observation results for management of gasket fastening. there is to do

In order to achieve the above object, according to one aspect of the gasket of the present disclosure, an outer cut is provided in a non-constrained portion adjacent to a constrained portion constrained between flanges, and the outer cut is shaped by a load received from the constraining portion. this changes

In order to achieve the above object, according to one aspect of the management method of the present disclosure, a step of installing a gasket having an outer cut whose shape changes under load between flanges, and a load on the gasket constrained between the flanges. and a step of measuring the shape of the outer cut that has changed under the load, and the gasket is managed based on the shape.

In order to achieve the above object, according to one aspect of the management system of the present disclosure, measurement means for measuring the shape of an outer cut provided in a gasket and management information for managing fastening between the flanges based on the shape are generated. and a management server for performing management, and an information presenting unit for presenting the management information.

In order to achieve the above object, according to one aspect of the program of the present disclosure, a program for realizing by a computer includes a function of obtaining shape information of an outer cut provided on a gasket that is constrained between flanges and subjected to a load; A function of generating management information for managing fastening of the gasket based on shape information and a function of presenting the management information are realized by the computer.

ADVANTAGE OF THE INVENTION According to this invention, any of the following effects are acquired.

(1) The gasket is distorted by the load applied to the gasket from between the flanges, and this distortion can be visualized as a change in the shape of the outer cut of the gasket, which can be visualized and easily recognized as a change in the shape of the outer cut. can

(2) By observing the shape change of the outer cut, the load applied to the gasket can be easily grasped without being affected by the fastening state of the bolt, and the gasket fastening can be properly managed.

(3) If the load applied to the gasket is estimated from the shape change of the outer cut, this load is equal to the gasket seal surface pressure received from the flange, and the gasket management precision, such as fastening management and gasket life prediction, can be improved.

(4) The shape change of the outer cut and the load estimated from this shape change directly reflect the fastening state of the gasket, unlike the bolt torque value and axial force value, so these shape changes are observed and the load is estimated. In this way, the gasket management accuracy can be increased regardless of the skill of the worker.

And other objects, characteristics, and advantages of the technology of the present disclosure will become clearer by referring to the accompanying drawings and each embodiment.

A in FIG. 1 is a plan view showing a gasket according to the first embodiment, and B is a perspective view showing an enlarged portion IB of A. As shown in FIG.
Fig. 2 is a diagram showing a flange fastening part according to the first embodiment.
FIG. 3 is a view showing a cut section of the line III-III in FIG. 2 .
A in FIG. 4 is a diagram showing an enlarged outer cut portion, and B is a diagram showing a shape change of the outer cut.
A and B of FIG. 5 are views showing a modified example of the outer cut.
Fig. 6 is a diagram showing a gasket management system according to the first embodiment.
7 is a diagram showing a gasket management database.
A in FIG. 8 is a diagram showing a comparative example, and B is a diagram showing the setting of the shape observation unit.
Fig. 9 is a diagram showing the relationship between shape change and load in Comparative Example.
Fig. 10 is a diagram showing the relationship between shape change and load in Example.

[First Embodiment]

A in FIG. 1 shows the gasket 2 according to the first embodiment. The configuration shown in the figure is an example, and the present disclosure is not limited to this configuration. In Fig. 1, as an example, the X-axis, Y-axis, and Z-axis are written together.

This gasket 2 is, for example, a sheet gasket processed from a material blended with polytetrafluoroethylene (PTFE) and a filler. For the gasket 2, a resin material other than PTFE or a rubber material may be used.

The gasket 2 is provided with a restraining portion 2-1 on the inner diameter side and an unconstrained portion 2-2 on the outer diameter side. The restraining portion 2-1 is a region that comes into contact with the flanges 16-1 and 16-2 (Figs. 2 and 3) and receives the load F from between the flanges 16-1 and 16-2. On the other hand, the non-restraining portion 2-2 is a region not in contact with the flanges 16-1 and 16-2.

In the non-restraining portion 2-2, outer cuts 4-1, 4-2, 4-3, and 4-4 (hereinafter, when a specific position is not specified, are simply referred to as outer cuts 4). this is formed Each outer cut 4 is a notch obtained by partially cutting and releasing the outermost edge of the gasket 2, and is a means for facilitating detection of a change in shape of the gasket 2. Therefore, each outer cut 4 constitutes a shape observation section for observing a change in shape of the gasket 2 when the load F is applied to the restraining section 2-1.

＜Outer cut (4)＞

B in FIG. 1 shows an enlarged outer cut 4 in part IB in A in FIG. 1 . In this outer cut 4, it is a vertical groove cut by a certain length L toward the center from the circumferential surface of the outermost edge of the gasket 2 and released with a width W, and this vertical groove is formed in the gasket 2 ) through the upper and lower surfaces of the Accordingly, in this outer cut 4, the gasket 2 has the vertical surface portion 6 and the opposing surface portions 8-1 and 8-2 within the unconstrained portion 2-2. The vertical surface portion 6 is exposed in the direction of the circumferential surface of the gasket 2, and the opposite surface portions 8-1 and 8-2 of length L and height D face each other with a constant width W. . The height D is the thickness of the gasket 2 before deformation. In short, the width of the opening between the opposing surface portions 8-1 and 8-2 of the outer cut 4 can be measured.

In order to detect a change in the shape of the gasket 2, each outer cut 4 may be set at a plurality of points of the gasket 2. In terms of avoiding the influence of the elastic interaction received from the flanges 16-1 and 16-2 and increasing the observation accuracy of the shape change, it is preferable that the set position has no deflection. In this embodiment, each outer cut 4 is set at four points on the X axis and the Y axis, and observation of shape change can be observed over a wide range.

<Flange fastening part (12)>

2 shows the flange fastening part 12 including the gasket 2 cut away. This flange fastening part 12 is an example, and this indication is not limited to the structure shown in FIG.

In this flange joint 12, a flange 16-1 on the pipe 14-1 side, a flange 16-2 on the pipe 14-2 side (FIG. 3), a gasket 2, a plurality of Bolts (18) and nuts (20) are included.

The flange 16-1 is integrally formed with the end face of the conduit 14-1, and similarly, the flange 16-2 is integrally formed with the end face of the conduit 14-2. The flanges 16-1 and 16-2 have a larger diameter than the conduits 14-1 and 14-2, and a plurality of bolts 18 and nuts 20 are attached at predetermined angular intervals. A gasket 2 is installed inside the bolt 18 and the nut 20 between the flanges 16-1 and 16-2. The gasket 2 constitutes a sealing member of the flange fastening portion 12 . Therefore, the gasket 2 is loaded by the load F applied to the flanges 16-1 and 16-2 by fastening of the bolts 18 and nuts 20, and the pipe 14-1 , 14-2), the sealing is performed together with the fastening.

The restraining portion 2-1 of the gasket 2 is sandwiched between the respective flanges 16-1 and 16-2, and is restrained in contact with the flanges 16-1 and 16-2. The non-restraining portion 2-2 protrudes around the restricting portion 2-1 and does not contact the flanges 16-1 and 16-2, in short, to the flanges 16-1 and 16-2. not bound The restraining portion 2-1 receives a load F from the flanges 16-1 and 16-2 by fastening the bolt 18 and the nut 20. In contrast, the unconstrained portion 2-2 constitutes a free end that does not receive the load F.

Then, when a load F is applied from the flanges 16-1 and 16-2 to the restraining portion 2-1, the load distortion of the restraining portion 2-1 by the load F is -1) and integral unrestricted portion 2-2, and causes a shape change in the outer cut 4. As a result, each outer cut 4 of the unconstrained portion 2-2 constitutes a site for observing a change in shape appearing in the gasket 2.

<Relationship between the constrained portion 2-1, the non-restricted portion 2-2, and the flanges 16-1 and 16-2>

FIG. 3 shows a cross section taken along line III-III of FIG. 2 . The restraining portion 2-1 of the gasket 2 is interposed and restrained between the respective gasket sheets 22 of the flanges 16-1 and 16-2. In contrast, the non-constrained portion 2-2 protrudes from the gap 24 between the flanges 16-1 and 16-2. The non-constrained portion 2-2 is integral with the confined portion 2-1, and while being supported between the flanges 16-1 and 16-2, it protrudes from the gap 24 and is a free end. In short, the unrestricted portion 2-2 is in a cantilever state.

Distortion, deformation, etc. generated in the restraining portion 2-1 by receiving the load F from the flanges 16-1 and 16-2 appear as shape changes in the non-constraining portion 2-2. This shape change can be easily observed by the outer cut 4. In short, the change in the shape of the gasket 2 appearing in the unconstrained portion 2-2 is distortion or deformation due to being extruded from between the gasket sheets 22, and the confinement portion 2-1 of the gasket 2 Indicates the load received from the flanges 16-1 and 16-2.

<Observation of shape change by outer cut (4)>

The outer cut 4 is formed to make the distortion occurring in the unconstrained portion 2-2 visible as a remarkable shape change, and to facilitate observation thereof.

As shown in A of FIG. 4 , taking the X axis in the tangential direction of the gasket 2, the Y axis in the center of the outer cut 4, and the Z axis in the direction in which the load F is applied, the restraining portion (2- 1) When a load F is applied from the flanges 16-1 and 16-2, the shape change (= distortion) in the direction of the gap between the flanges 16-1 and 16-2 and in the direction of intersection with the direction of the gap generate This shape change includes a change in the shape of the gasket 2 in the circumferential direction.

For the shape change in the X-axis and Y-axis directions in this shape change, refer to B in FIG. 4 . The unconstrained portion 2-2 extends in the radial direction as indicated by arrows a and b. ΔY1 indicates that the unconstrained portion 2-2 is expanded in the radial direction, and ΔY2 indicates that the vertical surface portion 6 of the outer cut 4 is displaced in the radial direction. Accompanying such a change, the width W of the vertical surface portion 6 is expanded to the width W1, and the width W of the vertical portion of each opposing surface portion 8-1, 8-2 is the width W2. (> W1). This change in shape increases or decreases in proportion to the load F received by the gasket 2 from the flanges 16-1 and 16-2. In this example, the shape change in the X-Y axis direction is exemplified, but it goes without saying that the shape change in the Z-axis direction and the thickness direction also appears in the shape of the outer cut 4.

Therefore, distortion generated in the restraining portion 2-1 and the non-constraining portion 2-2 by receiving the load F from the flanges 16-1 and 16-2 increases due to the shape change of the outer cut 4. It can be made visible, and the observation can be facilitated.

<Modified example of outer cut (4)>

The outer cut 4 is not limited to the rectangular shape which consists of the vertical surface part 6 shown by B of FIG. 1, and opposing surface parts 8-1 and 8-2. A and B of FIG. 5 show a modified example of the outer cut 4. As shown in FIG. In FIG. 5 , the same reference numerals are given to parts corresponding to B in FIG. 1 .

As shown in A in Fig. 5, the outer cut 4 forms the opposing surface portions 8-1 and 8-2 as non-parallel surfaces, except for the vertical surface portion 6, and has a cross section in a "V" shape. You may form it, and as shown in B of FIG. 5, for example, you may form the vertical surface part 6 as a curved surface. Even with such a configuration, the shape change occurring in the non-constrained portion 2-2 by receiving the load F at the restraining portion 2-1 can be easily observed from the outer cut 4.

In addition, a sensor member such as metal or resin may be provided in the space portion of the outer cut 4, and a change in the shape of the outer cut 4 may be taken out from this sensor member.

<Management process of gasket (2)>

The gasket 2 management process is an example of the management method of the present disclosure. This management process includes step S1 of generating the constrained portion (2-1) and non-constrained portion (2-2), step S2 of adding the load (F), step S3 of acquiring shape information, step S4 of presenting shape information, etc. are doing S1 to S4 given to each process illustrate the order of each process, and the terms cited are only used for convenience.

Generation process S1 of constrained portion 2-1 and non-constrained portion 2-2: When the gasket 2 is installed between the flanges 16-1 and 16-2, the flanges 16-1 and 16-2 ) The portion of the gasket 2 in contact with is the restraining portion 2-1, and the portion of the gasket 2 not in contact with the flanges 16-1 and 16-2 is the non-constraining portion 2-2. do. In short, the restricting portion 2-1 and the non-constraining portion 2-2 of the gasket 2 are created by being provided between the flanges 16-1 and 16-2.

Step S2 of adding load F: gasket 2 fastens flanges 16-1 and 16-2 to restraining portion 2-1 constrained to flanges 16-1 and 16-2 The load (F) is added by Receiving this load F, the gasket 2 generates distortion in the restraining portion 2-1 and causes a shape change in the non-constraining portion 2-2.

Acquisition step S3 of shape information: Regarding the shape change appearing in the non-restraining part 2-2, the management server 30 (FIG. 6) receives the detection output of the distortion sensor 28, and of the outer cut 4 Acquire shape information.

Presentation process S4 of shape information etc.: The management server 30 generates presentation information containing shape information, and presents it by the information presentation part 32 (FIG. 6).

Further, Nth-order differentiation (multi-level differentiation) may be performed on the shape information obtained in the shape information acquisition step S3 to make the changing points of the shape information stand out. If the result of this processing is reflected in the presentation information in the presentation step S4, the point of change in the shape information can be clarified.

<Gasket Management System (26)>

6 shows a gasket management system 26 for executing the management process by information processing. The configuration shown in Fig. 6 is an example, and the present disclosure is not limited to this configuration. In FIG. 6 , the same reference numerals are given to the same parts as those in FIG. 3 .

This gasket management system 26 includes a distortion sensor 28, a management server 30 and an information presenting unit 32.

The distortion sensor 28 measures a shape change appearing on the outer cut 4 of the gasket 2, and outputs a detection signal representing this shape change. This distortion sensor 28 is an example of means for detecting shape changes and converting them into electrical signals. In addition to the distortion sensor 28, a laser displacement meter, a camera, or the like may be used as the means for observing the shape change. The laser displacement meter irradiates the outer cut 4 with laser light, detects a shape change of the outer cut 4 as reflected light, and observes the amount of change. The camera captures an image of the outer cut 4, the management server 30 detects distortion appearing in the outer cut 4 by the number of pixels, and acquires shape information associated with the distortion.

The management server 30 is constituted by a computer having a communication function. This management server 30 includes a processor 34, a storage unit 36, an input/output (I/O) unit 38, and a communication unit 40. The processor 34 executes an OS (Operating System) and a management program in the storage unit 36 to process information for gasket management. The storage unit 36 includes a storage medium for storing an OS and a management program. A gasket management database (DB) 42 (FIG. 7) is stored in this storage unit 36. Under the control of the processor 34, the communication unit 40 inputs or presents information in cooperation with a management terminal (not shown). The management terminal is also utilized for acquisition of shape information, writing and reading of the gasket management DB 42, and the like.

In addition, the information presentation unit 32 presents management information including load information and judgment information related to shape information under the control of the management server 30 .

<Information Processing of Management Server 30>

In the information processing of the management server 30,

a) Collection processing of the detection output of the distortion sensor 28

b) Acquisition of shape information of the outer cut 4

c) generation of presentation information including shape information

d) Presentation of estimated information by the information presentation unit 32

processing, etc.

<Gasket management DB (42)>

Fig. 7 shows an example of the gasket management DB 42. In this gasket management DB 42, a gasket management file 44 is stored.

In this gasket management file 44, gasket information section 46, outer cut information section 47, time information section 48, load information section 50, torsion sensor information section 52, detection information section 54, determination information section ( 56), and a history information section 58 is set.

The gasket information unit 46 stores specification information for specifying the gasket 2 in addition to identification information of the gasket 2 .

The outer cut information section 47 stores outer cut information such as a shape indicating the shape of the outer cuts 4-1, 4-2, 4-3, and 4-4, their arrangement position and size.

The time information section 48 stores time information such as measurement date and time.

The load information unit 50 stores load information indicating a load F applied to the gasket 2 from the flanges 16-1 and 16-2.

In the distortion sensor information section 52, sensor information including types of the distortion sensors 28 (= 28-1, 28-2, 28-3, and 28-4), identification information, and the like is stored.

Measurement information such as shape change obtained from each outer cut 4 (= 4-1, 4-2, 4-3, 4-4) is stored in the detection information section 54.

In the decision information section 56, decision information indicating a decision result such as a decision result of the measurement information of the outer cut 4 and load information estimated from this measurement information is stored.

In the history information unit 58, history information such as acquisition of shape information is stored.

<Effects of the first embodiment>

According to this 1st Embodiment, any of the following effects are acquired.

(1) Since the gasket 2 is provided with the outer cut 4, the restraining part 2-1 receives the load F from the flanges 16-1 and 16-2, and the restraining part 2-1 The distortion generated can be visualized as a change in the shape of the outer cut 4 of the unconstrained portion 2-2. In short, the shape change corresponding to the load F can be easily observed from the outer cut 4 .

(2) From the outer cut 4, the shape information of the outer cut 4 is acquired by the detection output of each distortion sensor 28, and the load that the gasket 2 receives from the flanges 16-1 and 16-2 can be estimated from the shape change.

(3) The distortion of the gasket 2 can be observed by the shape change of the outer cut 4, and the gasket 2 is not affected by the tightening torque or axial force of the bolt 18, and the gasket 2 is subjected to the shape change. The load can be estimated and the fastened state of the gasket 2 can be determined.

(4) The fastening state of the gasket 2 is not influenced by the skill of the workers, and the management accuracy can be increased.

[Second Embodiment]

The management method of the gasket 2 according to the second embodiment includes an estimation step S5 based on inflection point information in addition to the management process of the first embodiment.

In the estimation step S5 based on the inflection point information, the shape information including the shape change appearing on the outer cut 4 includes information on the inflection point (FIG. 9, FIG. 10) for a specific load, and the management server 30 determines the inflection point From this, it is possible to estimate the fastening state of the gasket 2, that is, the surface pressure that the gasket 2 receives from the flanges 16-1 and 16-2.

<Effect of the second embodiment>

According to the second embodiment, any one of the following effects is obtained.

(1) In the shape information, an inflection point can be included as load specific information.

(2) By correlating the load to be set to this inflection point, a specific load can be set by confirming the inflection point from the shape information.

(3) The load F, that is, the surface pressure, can be estimated from the shape change of the outer cut 4 that the gasket 2 is subjected to, and the setting and adjustment of the load on the gasket 2 can be facilitated.

Example

Examples of the gasket 2 of the present disclosure will be described along with comparative examples.

<Comparative Example>

A in FIG. 8 shows a gasket 2 according to a comparative example. In this comparative example, the constraining portion 2-1 and the non-constraining portion 2-2 are set concentrically with the same width or substantially the same width, and unlike the examples, the outer cut 4 is not provided. .

In this comparative example, as shown in B of FIG. 8 , shape observation units 60-1, 60-2, 60-3, and 60-4 are set at positions corresponding to the outer cut 4 of the example. Each shape observation part 60-1, 60-2, 60-3, 60-4 is arrange|positioned at the angular interval of 90 degree|central angle in the non-restraining part 2-2.

<Examples>

Table 1 shows the shape of the outer cut 4 of the gasket 2 related to the examples, the measurement results thereof, and the like.

Table 1 shows the shape, shape change, and load for a comparative example (= without outer cut) and an example (= with outer cut).

In the comparative example, the outer cut 4 is not provided.

In the example, an outer cut 4 having a width W1 = 1 mm and a length L1 = 3 mm was formed.

In the comparative example, the inflection point load = 140 kN was obtained from the circumferential twist, and the minimum point load was not obtained. Similarly, in Examples, it was confirmed that an inflection point load = 125 kN was obtained from twisting in the circumferential direction, and that a change occurred in the opening width of the outer cut 4.

<Inflection point information in shape change>

Fig. 9 shows the relationship between shape change and load, with load [kN] on the abscissa and distortion on the ordinate. In FIG. 9 , for example, angles = 0 (deg), 45 (deg), and 90 (deg) are used as parameters, and the shape change appearing in the gasket 2 according to the comparative example is measured by the distortion sensor 28. represents

m1 is the deformation of the gasket 2 in the 0 (deg) direction (= the circumferential direction of the gasket 2), m2 is the deformation of the gasket 2 in the 45 (deg) direction, and m3 is the deformation of the gasket 2 in the 90 (deg) direction (= gasket The deformation in the thickness direction of (2) is shown.

In this way, when the restraining portion 2-1 receives the load F from the flanges 16-1 and 16-2, a shape change corresponding to the load F occurs in the non-constraining portion 2-2. Also in the Example, the measurement result similar to FIG. 9 was obtained.

An inflection point is generated in this shape change, and the optimum load F is specified from the relationship between the load F applied to the gasket 2 and the inflection point of the shape change, and can be used for judgment information on completion of initial fastening.

Fig. 10 shows the relationship between the shape change and the load in the gasket 2 according to the example, with the load [kN] on the abscissa and the opening width [mm] of the outer cut 4 on the ordinate. Similarly, Table 2 shows the relationship between the load of the outer cut 4 and the opening width W2.

When the restraining part 2-1 receives the load F from the flanges 16-1 and 16-2 and this load increases, the opening width of the outer cut 4 increases according to the load. In this shape change, a remarkable inflection point different from that of the comparative example is generated. Therefore, according to the gasket 2 according to the embodiment, if the inflection point of the shape change appearing in each outer cut 4 or a certain outer cut 4 is made a target, the relationship between the shape change and the load can be specified.

Therefore, in the gasket 2 according to the embodiment, an inflection point can be created in shape information corresponding to a specific load. Thereby, at the time of fastening of the flanges 16-1 and 16-2, a specific load can be estimated from the inflection point of the shape information, and it can be used as a criterion for determining the completion of fastening.

<Detection of inflection point of shape information and tightening criteria>

In the gasket 2 according to the embodiment, an inflection point can be created in shape information corresponding to a specific load. Thereby, at the time of fastening of the flanges 16-1 and 16-2, a specific load can be estimated from the inflection point of the shape information, and it can be used as a criterion for determining the completion of fastening.

<Effects of Examples>

A change in the shape of the gasket 2 can be observed from the opening width W2 of the outer cut 4 . In short, the load can be easily estimated by measuring the opening width W2 of the outer cut 4 for each load of the gasket 2 in advance and comparing the opening width W2 with the measured value. In this estimation, the opening width W2 of the outer cut 4 is made into a database for each load, and the load can be easily and accurately estimated in comparison with the measured value of the shape change.

In monitoring and measuring such shape changes, unlike torque management and bolt axial force measurement, shape changes appearing in the outer cut 4 of the non-constrained portion 2-2 are measured, and the shape representing the load from the gasket 2 is obtained. information can be obtained. For this reason, the shape change of the gasket 2 by the load F applied to the flanges 16-1 and 16-2 without being affected by the bolt 18 and the flanges 16-1 and 16-2. The load can be estimated from

Regarding the processing shape of the outer cut 4, it was confirmed that the gasket 2 can also correspond to various diameters and thicknesses.

＜Bookkeeping＞

Regarding the above embodiments and examples, additional remarks are disclosed below.

(Note 1) As a gasket installed between the flanges of the flange fastening part,

A restraining part constrained between the flanges to receive a load;

A non-constrained portion that is not constrained between the flanges;

A gasket having a cutout portion formed in the non-restraining portion, and generating a change in the cutout portion by receiving the load.

(Note 2) As a management system for managing a flange fastening portion having a gasket between flanges,

A restraining part constrained between the flanges to receive a load, a non-constrained part not constrained between the flanges, and a cutout formed in the non-constrained part,

A gasket that generates a change in the cutout portion by receiving the load;

A measuring instrument for measuring the change in the cutout in contact or non-contact with the gasket;

A management server that acquires measurement information from the measuring instrument and generates management information including a fastening force between the flanges;

A management system comprising: an information presentation unit that presents the management information in relation to the gasket or the flange fastening unit.

(Note 3) A recording medium on which a program to be realized by a computer is recorded,

A function of being constrained between flanges, receiving a load from between the flanges, and obtaining shape information including a change that occurs at a cutout in an unconstrained portion of the gasket due to the load;

A function of generating management information including a fastening force between the flanges based on the shape information;

A recording medium recording a program for realizing the function of presenting the management information by the computer.

[Other Embodiments]

(1) In the above embodiments and examples, the initial fastening of the flange fastening portion 12 was exemplified by receiving a load from between the flanges and observing the shape change generated in the gasket 2, but the flange fastening It is not limited to initial fastening.

(2) Regarding the outer cut 4, in the embodiment, the vertical surface portion 6 and the opposing surface portions 8-1 and 8-2 are exemplified. This form is an example, and may be a shape without the vertical surface portion 6, a polygonal shape or a rectangular cutout shape in addition to a V shape, for example, in which the opposing surface portions 8-1 and 8-2 are non-parallel. .

(3) In the above embodiments, comparative examples, and examples, the load F applied to the gasket 2 by being sandwiched between the flanges 16-1 and 16-2 and the shape change of the gasket 2 are described. The load F applied to the gasket 2 is equivalent to the surface pressure that the gasket 2 receives from the flanges 16-1 and 16-2, and there is no qualitative difference between the two. In short, from the relationship between the load F applied to the gasket 2 and the shape change appearing on the outer cut 4, the surface pressure of the gasket 2 can be estimated from the shape change.

(4) In the step of presenting shape information or the like among the gasket 2 management steps (S4), presentation information may be generated by processing such as multi-step differentiation of the acquired shape information in the management server 30, and the information presentation unit (32) (FIG. 6) may show a display section specifying the points of change.

As described above, the most preferred embodiment of the present disclosure and the like have been described. The present disclosure is not limited to the above description. Various modifications and changes are possible for those skilled in the art based on the summary of the invention described in the claims or disclosed in the form for carrying out the invention. Needless to say, such variations or modifications are included within the scope of the present disclosure.

According to the gasket, the management method, system, and program of the present disclosure, it is possible to easily observe the shape change of the outer cut deformed by receiving the load (F) from the flange, without being affected by the fastening state of the bolt or flange. The load or surface pressure can be estimated, and the fastening state of the gasket can be managed.

2 : Gasket
2-1: Constraints
2-2: Unconstrained part
4, 4-1, 4-2, 4-3, 4-4: outer cut
6: vertical plane
8-1, 8-2: facing surface
12: flange fastening part
14-1, 14-2: pipeline
16-1, 16-2: Flange
18: Bolt
20: nut
22: gasket sheet
24: Gap
26: gasket management system
28, 28-1, 28-2, 28-3, 28-4: warping sensor
30: management server
32: information presentation unit
34: processor
36: storage unit
38: input/output (I/O) unit
40: Ministry of Communication
42: gasket management database (DB)
44: gasket management file
46: gasket information unit
47: outer cut information unit
48: time information department
50: load information unit
52: warping sensor information unit
54: detection information unit
56: judgment information unit
58: history information unit
60-1, 60-2, 60-3, 60-4: shape observation unit

Claims (4)

A gasket characterized in that an outer cut is provided in an unconstrained portion adjacent to a restraining portion constrained between flanges, and a shape of the outer cut is changed by a load received from the restraining portion. A step of installing a gasket having an outer cut whose shape changes under a load between flanges;
applying a load to the gasket constrained between the flanges;
Including a step of measuring the shape of the outer cut changed by receiving the load,
A management method characterized in that managing the fastening of the gasket based on the shape. Measuring means for measuring the shape of the outer cut provided in the gasket;
A management server for generating management information for managing fastening between flanges based on the shape;
A management system comprising an information presenting unit presenting the management information. As a program for realizing by a computer,
A function of obtaining shape information of an outer cut provided to a gasket that is restrained between flanges and receives a load;
a function of generating management information for managing fastening of the gasket based on the shape information;
A program for realizing the function of presenting the management information with the computer.

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