Management system and method

Abstract

To improve effectiveness of prevention of valve fixation.SOLUTION: A management system includes: a temperature acquisition section 3 acquiring temperature data from a temperature sensor 1 provided in a valve body; a temperature storage section 4 storing the temperature data; a fixation prevention condition storage section 5 storing a relation between a temperature of the valve body and a duration of the temperature when fixation of the valve body did not occur in past investigation, as a fixation prevention condition; a temperature rise state determination section 6 determining whether or not a temperature rise of the valve body is sufficient by checking the temperature of the valve body and the duration of the temperature after resumption of heating treatment out of data stored in the temperature storage section 4 against the fixation prevention condition when the heating treatment of the valve body is resumed in a facility in which the valve body is installed; and a determination result presentation section 7 presenting the determination result obtained by the temperature rise state determination section.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a management system and a management method for managing a valve. [Background technology]

[0002] Valves used in petrochemical plants and the like (for example, the control valve in Fig. 8) require particular attention to safety, and therefore undergo regular maintenance. The control valve shown in Fig. 8 is composed of a valve body 100 that opens and closes the passage through which the fluid flows, a positioner 101 that converts an input electrical signal into air pressure, and an actuator 102 that operates the valve body 100 in response to the air pressure supplied from the positioner 101.

[0003] In order to improve the efficiency of valve maintenance work in plants in which valves such as the one shown in FIG. 8 are installed, a technology has been proposed for detecting the occurrence of stick-slip in the sliding parts of the valve (see Patent Document 1), a technology for determining the hunting state of the valve (see Patent Document 2), a technology for detecting the adhesion of scale to the valve (see Patent Document 3), and the like.

[0004] On the other hand, as a different type of valve from the control valve that can change the opening continuously, there is an ON-OFF valve that can only take two positions, fully open and fully closed, such as a ball valve, butterfly valve, and gate valve. The ON-OFF valve 200 shown in Fig. 9 uses a ball valve and has a structure in which a ball 202, which is a valve body, is sandwiched between a seat ring 203 called a ball seat, and the valve can be opened and closed by rotating a stem (valve rod) 204 by 90 degrees using an operating device 206. A packing 207 is provided in the gap between the valve box 205 and the stem 204 to prevent leakage of the fluid in the valve box 205.

[0005] In a typical ball valve, there is a dead space called a pocket (208 in FIG. 9) between the valve body 205 and the ball 202, and fluid accumulates in the pocket 208. Fluid that accumulates and solidifies in this pocket 208 can cause the valve body 201 to stick, resulting in malfunction.

[0006] Fig. 10(A) shows the normal fully open state of the valve body 201, and Fig. 10(B) shows the normal fully closed state. On the other hand, Fig. 10(C) shows a state in which the process fluid 209 has accumulated and solidified in the pocket portion 208, causing the valve body 201 to remain fully open and not close, and Fig. 10(D) shows a state in which the valve body 201 remains fully closed and cannot open.

[0007] Particularly in facilities that handle process fluids that become solid (high viscosity) at room temperature, such as polymer resins, there is a high possibility of the ON-OFF valve 200 becoming stuck. For example, in the example shown in Fig. 11, a fixed amount of process fluid, such as raw materials and solvents, is charged into the polymerization vessel 300 via the ON-OFF valves 200-1 and 200-2, and a polymerization reaction is initiated in the polymerization vessel 300 to produce a solid or semi-solid polymer resin.

[0008] In such equipment, in order to prevent the process fluid from sticking, steam tracing is performed on the piping and valve bodies, or heating treatment (heating or heat retention) such as electric tracing is performed. In the example of Fig. 12, a tracing piping 302 for steam tracing is arranged along the piping 301-1 to 301-3 and the valve bodies 201-1 to 201-3 of the ON-OFF valves 200-1 to 200-3. However, steam tracing and electric tracing may not be able to sufficiently prevent the ON-OFF valves from sticking, and improvements are required. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 3254624 Public Relations [Patent Document 2] JP 2015-114942 A [Patent Document 3] JP 2015-114943 A Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made to solve the above problems, and has an object to provide a management system and a management method for improving the effectiveness of preventing valve sticking. [Means for solving the problem]

[0011] The management system of the present invention is characterized in comprising a temperature acquisition unit configured to acquire temperature data from a temperature sensor provided in the valve body; a temperature memory unit configured to store the temperature data; a sticking prevention condition memory unit configured to store, as a sticking prevention condition, a relationship between the temperature of the valve body and the duration of that temperature when no sticking of the valve body occurred in a past investigation; a temperature rise state determination unit configured, when heating treatment of the valve body is resumed in equipment in which the valve body is installed, to compare the temperature and the duration of that temperature of the valve body after heating treatment is resumed, among the data stored in the temperature memory unit, with the sticking prevention condition to determine whether the temperature of the valve body is sufficient; and a determination result presentation unit configured to present a determination result of the temperature rise state determination unit.

[0012] In addition, one configuration example of the management system of the present invention is characterized in that it further includes a heating command output unit configured to output a heating command to a heating treatment control device so as to raise the heating temperature of the heating treatment after restart from the set temperature at the normal level or to extend the duration of the heating treatment after restart when the temperature rise of the valve body is insufficient. Furthermore, in one configuration example of the management system of the present invention, the heating command output unit estimates the duration of the temperature that satisfies the sticking prevention condition based on the temperature of the valve body after the heating treatment is resumed and the sticking prevention condition, and outputs the heating command so that the duration of the heating treatment after the restart is equal to or longer than the estimated duration. Furthermore, in one configuration example of the management system of the present invention, the heating command output unit estimates a temperature of the valve body that satisfies the sticking prevention condition based on a predetermined duration of the heating treatment and the sticking prevention condition, and outputs the heating command so that the heating temperature by the heating treatment after the restart is equal to or higher than the estimated temperature.

[0013] Furthermore, the management method of the present invention is characterized by including a first step of acquiring temperature data from a temperature sensor provided in the valve body; a second step of storing the temperature data; a third step of referring to a memory unit that stores, as a sticking prevention condition, a relationship between the temperature of the valve body and the duration of the temperature when no sticking of the valve body occurred in a past investigation when heating treatment of the valve body is resumed in a facility in which the valve body is installed, and comparing the temperature and the duration of the temperature of the valve body after heating treatment is resumed, among the data stored in the second step, with the sticking prevention condition to determine whether the temperature of the valve body is sufficient; and a fourth step of presenting a result of the determination in the third step.

[0014] Furthermore, one configuration example of the management method of the present invention is characterized in that it further includes a fifth step of outputting a heating command to a heat treatment control device when the temperature rise of the valve body is insufficient, so as to raise the heating temperature of the heat treatment after restart from the set temperature at the normal level or to extend the duration of the heat treatment after restart. Furthermore, in one configuration example of the management method of the present invention, the fifth step is characterized by including a step of estimating the duration of the temperature that satisfies the sticking prevention condition based on the temperature of the valve body after the heating treatment is restarted and the sticking prevention condition, and outputting the heating command so that the duration of the heating treatment after the restart is equal to or longer than the estimated duration. Furthermore, in one configuration example of the management method of the present invention, the fifth step is characterized by including a step of estimating a temperature of the valve body that satisfies the sticking prevention condition based on a predetermined duration of the heating treatment and the sticking prevention condition, and outputting the heating command so that the heating temperature by the heating treatment after the restart is equal to or higher than the estimated temperature. Effect of the Invention

[0015] According to the present invention, by providing a temperature acquisition unit, a temperature memory unit, a sticking prevention condition memory unit, and a temperature rise state determination unit, it is possible to determine whether the temperature of the valve body has risen sufficiently and to take measures according to the determination result, thereby improving the effectiveness of preventing the valve from sticking. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a block diagram showing a configuration of a management system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a flowchart illustrating the operation of the management system according to the embodiment of the present invention. [Diagram 3] FIG. 3 is a block diagram showing a configuration of a temperature sensor according to an embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing an example of the results of a preliminary investigation into the relationship between the temperature of the valve body and the duration of the temperature. [Diagram 5] FIG. 5 is a diagram showing an example of the mounting position of the temperature sensor according to the embodiment of the present invention. [Figure 6] FIG. 6 is a diagram showing an example of the attachment position of the tracing pipe according to the embodiment of the present invention. [Figure 7]FIG. 7 is a block diagram showing an example of the configuration of a computer that realizes a management system according to an embodiment of the present invention. [Figure 8] FIG. 8 is a diagram showing an example of a control valve. [Figure 9] FIG. 9 is a diagram showing an example of an ON-OFF valve. [Figure 10] FIG. 10 is a diagram for explaining malfunction caused by sticking of an ON-OFF valve. [Figure 11] FIG. 11 is a diagram showing an example of polymerization process equipment. [Figure 12] FIG. 12 is a diagram illustrating steam tracing in a polymerization process facility. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] [Principle of the invention] In the following explanation, steam tracing will be described as a representative example of heat treatment. There are cases where the equipment in which the ON-OFF valve is installed is shut down or steam tracing is temporarily stopped, and when operation is restarted, steam tracing is also restarted. The inventors have discovered that when steam tracing is restarted, if the temperature of the ON-OFF valve body is not sufficiently raised, the ON-OFF valve may become stuck and not move.

[0018] Therefore, the inventors came up with the idea of ​​making it possible to measure the temperature of the valve body in an ON-OFF valve, and determining in advance the relationship between the temperature and the duration of the temperature and the sticking of the valve body, thereby determining whether the temperature rise is sufficient or not. Furthermore, in the present invention, if it is determined that the temperature rise is insufficient, the effectiveness (effect) of preventing sticking can be improved by responding by increasing the steam tracing output or lengthening the duration.

[0019] It is preferable to detect the valve opening and the air pressure (torque) of the actuator to confirm whether the valve has been stuck or not before restarting this process of the equipment itself. The present invention is particularly effective for valves having pockets that may cause sticking. Valves having pockets include, in addition to ball valves, plug valves, for example. However, the present invention can also be applied to valves other than ball valves and plug valves.

[0020] [Example] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram showing the configuration of a management system according to an embodiment of the present invention. In this embodiment, in order to simplify the explanation, examples of valve IDs and the like are simpler than those used in an actual plant.

[0021] The management system includes a temperature sensor 1 that measures the temperature of the body of an ON-OFF valve, a valve ID storage unit 2 that stores in advance the ID (identification information) of an ON-OFF valve equipped with the temperature sensor 1, a temperature acquisition unit 3 that acquires temperature data from the temperature sensor 1, a temperature storage unit 4 that stores the temperature data together with the ID of the ON-OFF valve that transmitted the temperature data, a sticking prevention condition storage unit 5 that stores, as a sticking prevention condition, the relationship between the temperature of the valve body and the duration of the temperature when sticking of the valve body did not occur in a past investigation, and a sticking prevention condition storage unit 6 that stores, when heating treatment of the valve body is resumed in a facility in which the ON-OFF valve is installed, The system is provided with a temperature rise state determination unit 6 which, when the temperature of the valve body is raised, compares the temperature and duration of that temperature of the valve body when the most recent heating process was carried out, among the data stored in the temperature memory unit 4, with the anti-sticking conditions to determine whether the temperature of the valve body has been raised sufficiently, a determination result presentation unit 7 which presents the determination result of the temperature rise state determination unit 6, and a heating command output unit 8 which, if the temperature rise of the valve body is insufficient, outputs a heating command to the heating process control device so as to raise the heating temperature in the heating process after the restart from the set temperature at the normal level or to extend the duration of the heating process after the restart.

[0022] 2 is a flow chart for explaining the operation of the management system of this embodiment. In this embodiment, for example, it is assumed that there are 26 ON-OFF valves in a plant, and that these 26 ON-OFF valves are assigned unique IDs "VA", "VB", "VC", . . . "VX", "VY", and "VZ" in advance. In this embodiment, it is assumed that the ON-OFF valves with valve IDs "VA", "VC", and "VM" are the ON-OFF valves to be subjected to steam tracing, and that these IDs "VA", "VC", and "VM" are stored in advance in the valve ID storage unit 2. For example, it is assumed that the ID of the ON-OFF valve 200-1 in FIG. 11 and FIG. 12 is "VA", the ID of the ON-OFF valve 200-2 is "VC", and the ID of the ON-OFF valve 200-3 is "VM".

[0023] 3 is a block diagram showing the configuration of the temperature sensor 1 attached to the ON-OFF valve. The temperature sensor 1 includes a temperature measurement unit 10 that measures the temperature of the valve body of the ON-OFF valve, a valve ID storage unit 11 that stores a valve ID unique to the ON-OFF valve to which the temperature sensor 1 is attached, and a transmission unit 12 that periodically transmits the temperature data and the valve ID to the management system.

[0024] The temperature acquisition unit 3 of the management system receives temperature data from the temperature sensor 1 of each ON-OFF valve (step S100 in FIG. 2), and stores the received temperature data, the valve ID added to the temperature data, and the time of reception of the temperature data in the temperature storage unit 4 (step S101 in FIG. 2). In this way, the history of the temperature data of each ON-OFF valve is constantly stored in the temperature storage unit 4.

[0025] The sticking prevention condition storage unit 5 of the management system stores, as sticking prevention conditions, the relationship between the temperature of the valve body and the duration when sticking of the ON-OFF valve did not occur in a preliminary investigation. In the preliminary investigation, for a target ON-OFF valve (an ON-OFF valve equipped with a temperature sensor 1 and having an ID stored in the valve ID storage unit 2), the temperature of the valve body and the duration of the temperature are appropriately changed by changing the steam tracing conditions, and the valve opening and the actuator air pressure (torque) are detected to investigate the occurrence of sticking of the ON-OFF valve.

[0026] When an ON-OFF valve becomes stuck, as shown in Figures 10(C) and 10(D), the valve will remain fully open even when the actuator air pressure is at a level that would normally close the valve, or the valve will remain fully closed even when the actuator air pressure is at a level that would normally open the valve. Therefore, by detecting the valve opening and actuator air pressure, it is possible to determine whether the ON-OFF valve is stuck or not, and to collect the temperature of the valve body and the duration of that temperature when the valve is stuck, and the temperature of the valve body and the duration of that temperature when the valve is not stuck. Based on the collected data, it is possible to derive the relationship between the temperature of the valve body and the duration of that temperature when the ON-OFF valve is not stuck.

[0027] In practice, there is no problem if the conditions (relationship between temperature and duration) under which sticking does not occur can be confirmed. In other words, what is required is not to search for the critical conditions under which sticking occurs, but to store in the sticking prevention condition storage unit 5 the conditions under which sticking does not occur with a certain margin.

[0028] Technology for detecting the opening degree of an ON-OFF valve and the actuator air pressure supplied to the actuator of the ON-OFF valve is disclosed, for example, in JP 2021-026268 A.

[0029] When steam tracing is resumed in equipment in which ON-OFF valves are installed, the temperature rise state determination unit 6 of the management system compares the temperature of the valve body after steam tracing is resumed and the duration of that temperature, among the data stored in the temperature memory unit 4, with the sticking prevention conditions stored in the sticking prevention condition memory unit 5, and determines for each ON-OFF valve whether the temperature rise of the valve body is sufficient (Step S102 in Figure 2).

[0030] The temperature rise state determination unit 6 may check the latest maximum temperature Tmax of the valve body and the duration of the maximum temperature Tmax up to the present time among the data stored in the temperature memory unit 4 against the sticking prevention condition. More specifically, the temperature rise state determination unit 6 may check the average value of the temperature in the range from Tmax to Tmax-α (α is a predetermined temperature) before and after the latest maximum temperature Tmax of the valve body, and the duration of that range, against the sticking prevention condition.

[0031] The determination result presentation unit 7 of the management system presents the determination result of the temperature rise state determination unit 6 to the operator (step S103 in FIG. 2). The determination result presentation unit 7 may present (display) information on either "insufficient temperature rise" or "no problem with temperature rise" for all ON-OFF valves whose valve IDs are registered in the valve ID storage unit 2, or may present (display) the IDs of ON-OFF valves whose temperature rise is insufficient to the operator.

[0032] The operator, who has checked the presented judgment result, can determine that there is a possibility that the ON-OFF valve is stuck if the temperature rise is insufficient for at least one ON-OFF valve.The operator can then perform manual operations to increase the heating temperature (steam temperature) by steam tracing or to extend the duration of steam tracing so that the stuck ON-OFF valve is resolved.

[0033] Furthermore, when the operator does not perform a manual operation, the process of resolving the stuck ON-OFF valve may be performed automatically as follows. Specifically, when the temperature rise state determination unit 6 determines that the temperature rise is insufficient for at least one ON-OFF valve (YES in step S104 of Figure 2), the heating command output unit 8 of the management system outputs a heating command to the steam tracing control device to increase the heating temperature by steam tracing by a predetermined increase amount from the normal set temperature level or to extend the duration of steam tracing (step S105 of Figure 2).

[0034] As described above, the temperature data history of each ON-OFF valve is constantly stored in the temperature memory unit 4, so that when a heating command is output from the heating command output unit 8 to the steam trace control device, the temperature rise state determination unit 6 can make a determination (step S106 in FIG. 2). As in the above, the temperature rise state determination unit 6 can simply check the maximum temperature Tmax of the valve body after the heating command is output and the duration of the maximum temperature Tmax against the sticking prevention conditions. More specifically, the temperature rise state determination unit 6 can simply check the average value of the temperature in the range of Tmax to Tmax-α before and after the maximum temperature Tmax and the duration of that range against the sticking prevention conditions.

[0035] If the heating command output unit 8 of the management system determines after the heating command is output that the temperature has been sufficiently increased for all ON-OFF valves whose valve IDs are registered in the valve ID memory unit 2 (YES in step S107 of Figure 2), the heating command output unit 8 outputs a recovery command to the steam trace control device to return the steam trace to the normal level (step S108 of Figure 2).

[0036] If the heating temperature by steam tracing was increased by the previous heating command, the set temperature is returned to the normal level, and the steam tracing ends when the predetermined steam tracing duration has elapsed. If the steam tracing duration is extended beyond the predetermined steam tracing duration, the steam tracing ends when a return command is output from the heating command output unit 8. In this manner, the processes of steps S102 to S108 are carried out every time a steam trace is performed.

[0037] An example of the results of a preliminary investigation into the relationship between the temperature of the valve body and the duration of that temperature is shown in Figure 4. To simplify the explanation, fictitious data is shown, but data such as that shown in Figure 4 is actually obtained. In Figure 4, the ● mark 40 is a case where the valve did not stick, and the × mark 41 is a case where sticking occurred.

[0038] When the temperature of the valve body is T and the duration at temperature T is S, the condition for preventing sticking is given as AS+BT>1.0 (A and B are coefficients obtained from data). In the example of Figure 4, 0.0221S+0.00426T>1.0 is the condition that defines the region that includes cases where the valve did not stick. The equation for line 42 in Figure 4 that separates the region that includes cases where the valve did not stick from the region that includes cases where the valve did stick is 0.0221S+0.00426T=1.0.

[0039] Therefore, at least the equation of this straight line needs to be stored as the sticking prevention condition in sticking prevention condition storage unit 5. In this case, when the temperature T and duration time S stored in temperature storage unit 4 satisfy 0.0221S+0.00426T>1.0, temperature rise state determination unit 6 determines that the temperature rise of the valve body is sufficient, and when 0.0221S+0.00426T≦1.0 is satisfied, it determines that the temperature rise is insufficient.

[0040] FIG. 4 shows an example in which the area including cases where the valve did not stick and the area including cases where the valve did stick can be divided by a straight line. However, if it is more appropriate to divide the area by a curve such as a higher-order function, the sticking prevention conditions can be defined by a higher-order function formula.

[0041] When it is not easy to increase the temperature T of the valve body by steam tracing, it is possible to estimate the duration S that satisfies the anti-sticking condition. In this case, the temperature T of the valve body is a constant value, and A and B are known values ​​based on the anti-sticking condition. Therefore, the heating command output unit 8 can estimate an appropriate duration S such that S>(1.0-BT) / A. The heating command output unit 8 outputs a heating command so that the duration of steam tracing is equal to or greater than the estimated value S.

[0042] Furthermore, when the duration of steam tracing cannot be easily changed, it is possible to estimate the temperature T of the valve body that satisfies the sticking prevention condition. In this case, the duration S of temperature T is a known time from the point at which the appropriate temperature T is to be estimated to the end of steam tracing, and A and B are also known values ​​based on the sticking prevention condition. Therefore, the heating command output unit 8 can estimate the appropriate temperature T of the valve body so that T>(1.0-AS) / B. The heating command output unit 8 outputs a heating command so that the heating temperature by steam tracing becomes equal to or higher than the estimated temperature T.

[0043] However, the above estimation method is a simple method for ease of explanation, and in practice it is more preferable to estimate an appropriate duration S taking into consideration changes in the temperature T of the valve body. In this case, the duration S can be estimated so that S > (1.0 - BTm) / A, based on the average temperature Tm of the valve body after steam tracing is restarted. An appropriate calculation method for the average temperature Tm is to add up the temperature of the valve body for each unit measurement time after steam tracing is restarted and divide the result by the history time of steam tracing.

[0044] Specifically, if the temperature T of the valve body continues to be 150°C (Tm = T = 150), the required duration S is calculated to be 16.3 hours (approximately 16 hours and 20 minutes) according to the following formula (1). S>(1.0-BT) / A=(1.0-0.00426×150) / 0.0221 =16.3 (1)

[0045] Since the state and degree of sticking differs depending on the type (shape, size) of the ON-OFF valve and conditions such as installation conditions, it is preferable to collect data such as that shown in Figure 4 for each ON-OFF valve and set the sticking prevention conditions individually. However, if the conditions such as type and installation conditions are similar, the sticking prevention conditions may be reused from similar ON-OFF valves. Also, it goes without saying that the values ​​of A and B for AS+BT>1.0 may be calculated manually by an operator or may be calculated appropriately using a commonly known multivariate analysis method or the like.

[0046] 5 is a diagram showing an example of the mounting position of the temperature sensor 1 of this embodiment. The temperature sensor 1 may be provided in at least one of the stem 204 of the valve body 201 of the ON-OFF valve 200, the inside of the valve box 205, the packing 207, and the pocket portion 208. In addition, when multiple temperature sensors 1 are provided, for example, the average value of the temperatures measured by the multiple temperature sensors 1 may be used for the judgment by the temperature rise state judgment unit 6, or the lowest temperature among the temperatures measured by the multiple temperature sensors 1 may be used for the judgment.

[0047] 6 is a diagram showing an example of an installation position of a tracing pipe 302 for steam tracing. As shown in Fig. 6, the tracing pipe 302 is installed so as to be wound around the valve body 201 of the ON-OFF valve 200, for example.

[0048] In this embodiment, a steam heating device (steam tracing) that supplies steam to the tracing piping 302 for heating has been described as an example of a heating device for heating the ON-OFF valve 200. However, this is not limited to this, and the present invention may be applied to equipment equipped with a heating device (electric tracing) that supplies electricity to an electric heater attached to the ON-OFF valve 200 and the piping 301 for heating.

[0049] The management system described in this embodiment can be realized by a computer equipped with a CPU (Central Processing Unit), a storage device, and an interface, and a program that controls these hardware resources. An example of the configuration of this computer is shown in FIG. 7. The computer is equipped with a CPU 400, a storage device 401, and an interface device (I / F) 402. For example, the temperature sensor 1 of each ON-OFF valve, a display, a heating process control device, etc. are connected to the I / F 402. In such a computer, a program for realizing the management method of the present invention is stored in the storage device 401. The CPU 400 executes the processing described in this embodiment in accordance with the program stored in the storage device 401. [Industrial Applicability]

[0050] The present invention can be applied to a technique for preventing valve sticking. [Explanation of symbols]

[0051] 1...temperature sensor, 2...valve ID storage unit, 3...temperature acquisition unit, 4...temperature storage unit, 5...sticking prevention condition storage unit, 6...temperature rise state determination unit, 7...determination result presentation unit, 8...heating command output unit, 10...temperature measurement unit, 11...valve ID storage unit, 12...transmission unit.

Claims

1. a temperature acquisition unit configured to acquire temperature data from a temperature sensor provided in the valve body; a temperature storage unit configured to store the temperature data; a sticking prevention condition storage unit configured to store, as a sticking prevention condition, a relationship between the temperature of the valve body and the duration of the temperature when sticking of the valve body did not occur in a past investigation; a temperature rise state determination unit configured, when the heat treatment of the valve body is resumed in a facility in which the valve body is installed, to compare the temperature of the valve body after the heat treatment is resumed and the duration of the temperature, among the data stored in the temperature memory unit, with the sticking prevention condition, and to determine whether the temperature of the valve body is sufficiently increased; a determination result presentation unit configured to present a determination result of the temperature rise state determination unit.

2. 2. The management system according to claim 1, The management system further comprises a heating command output unit configured to output a heating command to a heating process control device so as to raise the heating temperature of the heating process after restart from a set temperature at a normal level or to extend the duration of the heating process after restart when the temperature rise of the valve body is insufficient.

3. 3. The management system according to claim 2, the heating command output unit estimates a duration at which the temperature that satisfies the sticking prevention condition will continue based on the temperature of the valve body after the heating treatment is restarted and the sticking prevention condition, and outputs the heating command so that the duration of the heating treatment after the restart is equal to or longer than the estimated duration.

4. 3. The management system according to claim 2, the heating command output unit estimates a temperature of the valve body that satisfies the sticking prevention condition based on a predetermined duration of the heating treatment and the sticking prevention condition, and outputs the heating command so that the heating temperature by the heating treatment after the restart is equal to or higher than the estimated temperature.

5. A first step of acquiring temperature data from a temperature sensor provided in a valve body; a second step of storing the temperature data; a third step of, when heat treatment of the valve body is resumed in the facility in which the valve body is installed, referring to a storage unit that stores, as a sticking prevention condition, a relationship between the temperature of the valve body and the duration of the temperature when no sticking of the valve body occurred in a past investigation, and comparing, from the data stored in the second step, the temperature of the valve body and the duration of the temperature after the heat treatment is resumed with the sticking prevention condition, to determine whether the temperature of the valve body is sufficient; and a fourth step of presenting a result of the determination in the third step.

6. 6. The management method according to claim 5, The management method further comprises a fifth step of outputting a heating command to a control device for a heat treatment so as to raise the heating temperature of the heat treatment after the restart from a set temperature at a normal level or to extend the duration of the heat treatment after the restart when the temperature rise of the valve body is insufficient.

7. 7. The management method according to claim 6, the fifth step including a step of estimating a duration of the temperature that satisfies the sticking prevention condition based on the temperature of the valve body after the heating treatment is restarted and the sticking prevention condition, and outputting the heating command so that the duration of the heating treatment after the restart is equal to or longer than the estimated duration.

8. 7. The management method according to claim 6, the fifth step including a step of estimating a temperature of the valve body that satisfies the sticking prevention condition based on a predetermined duration of the heating treatment and the sticking prevention condition, and outputting the heating command so that the heating temperature by the heating treatment after the restart is equal to or higher than the estimated temperature.

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