Valve Maintenance Assistance Device and Method

Abstract

The valve maintenance assistance device and method of the present invention improve the work efficiency of valve maintenance. The valve maintenance assistance device of the present invention includes: a stable data extraction unit (5) that extracts the actual opening value of a valve in a stable state of the opening command value and is the actual opening value in a time period corresponding to the opening command value in the stable state as diagnostic data; an oscillation determination unit (6) that determines whether the diagnostic data has an oscillation state of moving up and down at a substantially constant period with the opening command value in the stable state sandwiched therebetween; a friction determination unit (7) that, when it is determined that the oscillation state has occurred, determines whether the friction of the gland packing is too strong based on the oscillation speed and the oscillation up-and-down movement amplitude; a friction determination unit (8) that determines whether the friction is too weak; and a determination result presentation unit (9) that presents the ID of a valve determined to have too strong or too weak friction as the ID of a valve with a problem in the gland packing.

Description

Technical Field

[0001] The present invention relates to a technique for assisting maintenance work, and particularly to a valve maintenance assistance device and method for assisting the maintenance work of a valve equipped with gland packing. Background Art

[0002] Conventionally, valves used in petrochemical equipment etc. (for example, Figure 7 control valves) require special attention to safety, and thus need to be maintained regularly. Figure 7 The valve 100 shown is provided with a valve body 101, a positioner 102, and an actuator 103. The actuator 103 moves the valve shaft (valve stem) 104 up and down according to the air output pressure Po supplied from the positioner 102, and adjusts the opening degree of the valve (the gap between the valve element 105 and the seat ring 106). That is, the flow of the fluid is adjusted.

[0003] The positioner 102 detects the lifting position of the valve shaft 104, that is, the actual opening degree of the valve, based on the rotational angle position of the feedback lever 107 connected to the valve shaft 104, and supplies the air output pressure Po corresponding to the difference between the detected actual opening degree and the set opening degree to the actuator 103.

[0004] In order to prevent the fluid in the valve box 110 from leaking from the gap between the valve cover 111 provided at the upper part of the valve box 110 and the valve shaft 104, gland packing 109 is provided in the gap between the inner wall of the valve cover 111 and the valve shaft 104 in the gland portion 108 that slidably holds the valve shaft 104.

[0005] In the factory where the valve 100 shown is provided, in order to improve the maintenance work efficiency of the valve, a technique for determining the oscillation state of the valve has been proposed (see Patent Document 1). Figure 7

[0006] The valve maintenance assistance device disclosed in Patent Document 1 calculates the cumulative value of the change amount of the opening degree command value for the valve in a specified time TX as the change amount cumulative value A, calculates the cumulative value of the change amount of the actual opening degree value of the valve in the specified time TX as the sliding amount cumulative value B, calculates the difference between the change amount cumulative value A and the sliding amount cumulative value B as a determination index, and determines that the valve is in an oscillation state when the determination index exceeds a threshold value. In addition, when the valve maintenance assistance device disclosed in Patent Document 1 determines that the valve is in an oscillation state, it corrects the control parameters (PID parameters) of the control device that controls the opening degree of the control valve to the side where oscillation is less likely to occur. By automatically correcting the PID parameters, the oscillation state can be eliminated.

[0007] The technology disclosed in Patent Document 1 assumes a situation where the setting of the PID parameters is inappropriate due to an adjustment error of the PID parameters or a change in the characteristics of the valve. However, the cause of the valve oscillation is not limited to the inappropriate setting of the PID parameters. Therefore, in the technology disclosed in Patent Document 1, it may not be possible to eliminate the valve oscillation.

[0008] Multiple valves are used in petrochemical plants and the like. For example, in Figure 8 In the example, valves 10A and 100-M are arranged in flow path 114-1, and valve 100-C is arranged in flow path 114-3. 115-A, 115-C, and 115-M are flow meters, 116 is a tank, and 117 is a pressure transmitter. Thus, in equipment using multiple valves, etc., further improvement in the efficiency of maintenance work is required.

[0009] Prior Art Documents

[0010] Patent Documents

[0011] Patent Document 1: Japanese Patent Laid-Open No. 2015-114942 Summary of the Invention

[0012] Problems to be Solved by the Invention

[0013] The present invention has been completed to solve the above problems, and an object thereof is to provide a valve maintenance assistance device and method that can cope with valve oscillation not caused by inappropriate setting of control parameters and can improve the work efficiency of valve maintenance.

[0014] Technical Means for Solving the Problems

[0015] The valve maintenance assistance device of the present invention is characterized by comprising: an opening command value storage unit configured to store data of an opening command value given to a valve in correspondence with the ID of the valve as a data transmission source; an opening measurement value storage unit configured to store data of the actual opening value of the valve in correspondence with the ID of the valve as a data transmission source; a stable data extraction unit configured to search for data of an opening command value in a stable state that continuously indicates a substantially constant value for the same valve among the opening command values stored in the opening command value storage unit, and extract the actual opening value of the valve when the given opening command value becomes the stable state and the actual opening value in a time period corresponding to the opening command value in the stable state as diagnostic data; an oscillation determination unit configured to determine whether an oscillation state in which the oscillation occurs up and down with a substantially constant period sandwiching the opening command value in the stable state has occurred in the diagnostic data; a friction determination unit configured to determine whether there is a defect in the gland packing of the valve in which the oscillation state has occurred; and a determination result presentation unit configured to present the ID of the valve determined to have a defect in the gland packing.

[0016] Further, in one configuration example of the valve maintenance assistance device of the present invention, it is characterized in that, when the oscillation determination unit determines that the diagnostic data has entered an oscillating state, the friction determination unit determines whether the friction of the gland packing is too strong based on the oscillation speed and the oscillation vertical movement amplitude, and the determination result presentation unit presents the ID of the valve determined to have too strong friction of the gland packing as the ID of the valve with a defect in the gland packing.

[0017] Further, in one configuration example of the valve maintenance assistance device of the present invention, it is characterized in that, when the ratio of the oscillation speed to the oscillation vertical movement amplitude is greater than a first specified value, the friction determination unit determines that the friction of the gland packing is too strong.

[0018] Further, in one configuration example of the valve maintenance assistance device of the present invention, it is characterized in that, when the oscillation determination unit determines that the diagnostic data has entered an oscillating state, the friction determination unit determines whether the friction of the gland packing is too weak based on the oscillation speed and the oscillation vertical movement amplitude, and the determination result presentation unit presents the ID of the valve determined to have too weak friction of the gland packing as the ID of the valve with a defect in the gland packing.

[0019] Further, in one configuration example of the valve maintenance assistance device of the present invention, it is characterized in that, when the ratio of the oscillation speed to the oscillation vertical movement amplitude is less than a second specified value, the friction determination unit determines that the friction of the gland packing is too weak.

[0020] Further, the valve maintenance assistance method of the present invention is characterized by including: a first step of storing data of an opening command value given to a valve in correspondence with the ID of the valve that is the data transmission source; a second step of storing data of the actual opening value of the valve in correspondence with the ID of the valve that is the data transmission source; a third step of searching for data of an opening command value in a stable state that continuously indicates a substantially constant value among the opening command values stored in the first step, and extracting the actual opening value of the valve for which the given opening command value becomes the stable state and the actual opening value in the time period corresponding to the stable state opening command value as diagnostic data; a fourth step of determining whether the diagnostic data has entered an oscillating state of moving up and down at a substantially constant period with the stable state opening command value in between; a fifth step of determining whether there is a defect in the gland packing of the valve in which the oscillating state has occurred; and a sixth step of presenting the ID of the valve determined to have a defect in the gland packing.

[0021] Further, in one configuration example of the valve maintenance assistance method of the present invention, it is characterized in that the fifth step includes the following steps: when it is determined in the fourth step that the diagnostic data has entered an oscillating state, determine whether the friction of the gland packing is too strong based on the oscillation speed and the oscillation up-and-down movement amplitude; the sixth step includes the following steps: present the ID of the valve determined to have too strong friction of the gland packing as the ID of the valve with a problem in the gland packing.

[0022] Further, in one configuration example of the valve maintenance assistance method of the present invention, it is characterized in that the fifth step includes the following steps: when the ratio of the oscillation speed to the oscillation up-and-down movement amplitude is greater than a first specified value, determine that the friction of the gland packing is too strong.

[0023] Further, in one configuration example of the valve maintenance assistance method of the present invention, it is characterized in that the fifth step includes the following steps: when it is determined in the fourth step that the diagnostic data has entered an oscillating state, determine whether the friction of the gland packing is too weak based on the oscillation speed and the oscillation up-and-down movement amplitude; the sixth step includes the following steps: present the ID of the valve determined to have too weak friction of the gland packing as the ID of the valve with a problem in the gland packing.

[0024] Further, in one configuration example of the valve maintenance assistance method of the present invention, it is characterized in that the fifth step includes the following steps: when the ratio of the oscillation speed to the oscillation up-and-down movement amplitude is less than a second specified value, determine that the friction of the gland packing is too weak.

[0025] Effects of the Invention

[0026] According to the present invention, by determining whether there is a problem with the gland packing of the valve in an oscillating state, it is possible to detect problems with the gland packing and assist the operator in selecting valves for maintenance candidates. As a result, in the present invention, it is possible to deal with valve oscillations that are not caused by inappropriate setting of control parameters, and improve the work efficiency of valve maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a block diagram showing the configuration of a valve maintenance assistance device according to a first embodiment of the present invention.

[0028] Figure 2 is a flowchart for explaining the operation of the valve maintenance assistance device according to the first embodiment of the present invention.

[0029] Figure 3 is a flowchart for explaining the operation of the valve maintenance assistance device according to the first embodiment of the present invention.

[0030] Figure 4 It is a diagram showing an example of an oscillating state with a roughly constant period of diagnostic data.

[0031] Figure 5 It is a diagram showing the configuration of the factory and its equipment management system according to the second embodiment of the present invention.

[0032] Figure 6 It is a block diagram showing a configuration example of a computer of a valve maintenance assistance device for implementing the first and second embodiments of the present invention.

[0033] Figure 7 It is a diagram showing an example of a control valve.

[0034] Figure 8 It is a diagram showing an example of a plurality of valves used in a tank in a factory. Detailed Description of the Invention

[0035] [Principle of the Invention]

[0036] The inventors found that if the friction of the gland packing is strong, an oscillation phenomenon of the valve occurs. In addition, even if the friction of the gland packing is too weak, an oscillation phenomenon also occurs.

[0037] Hereinafter, the oscillation phenomenon related to the friction of the gland packing will be described in detail. Here, the symbols of each part of the valve are used Figure 7 for the description. In a force balance type positioner, which is a representative example of a positioner 102 that can be said to automatically adjust the valve opening, since the mechanism related to the sensitivity (P action) is composed of mechanical components such as a cam or a spring, the sensitivity of the positioner is fixed. Therefore, as an adjustment operation of the action of the positioner 102, mechanical adjustment operations such as the state of the feedback rod 107 and the state of the air output pressure Po are performed through zero point and range adjustment.

[0038] Since the adjustment operation of the positioner 102 is the above-described operation content, when the friction of the gland packing 109 is strong, a state where the valve shaft 104 does not move relative to the opening command value (jamming) temporarily occurs. In this case, the positioner 102 increases the air output pressure Po to the actuator 103 (in the case of a reverse acting valve). Then, when the air output pressure Po exceeds the friction, the valve shaft 104 slides. When the feedback opening measurement value becomes excessive relative to the opening command value due to the sliding of the valve shaft 104, the positioner 102 decreases the air output pressure Po. Then, when the air output pressure Po exceeds the friction, the valve shaft 104 slides.

[0039] Thus, in the case of strong friction of the gland packing 109, jamming and sliding are repeated, resulting in oscillation. Therefore, by weakening the friction of the gland packing 109, jamming of the valve shaft 104 is eliminated, and the valve shaft 104 moves smoothly relative to the opening command value. As a result, oscillation can be eliminated. That is, if it can be determined that oscillation occurs due to strong friction of the gland packing 109, the operator can perform adjustment to solve the oscillation.

[0040] On the other hand, for example, through the adjustment operation to solve the oscillation, the friction of the gland packing 109 becomes too weak. In this case, the sensitivity of the positioner 102 and the level of friction are also in a non-consistent state, and the valve shaft 104 moves too smoothly, resulting in oscillation of other nature.

[0041] Therefore, by moderately strengthening the friction of the gland packing 109, oscillation can be eliminated. That is, if it can be determined that oscillation occurs due to weak friction of the gland packing 109, the operator can perform adjustment to solve the oscillation.

[0042] The inventor analyzed the occurrence mechanism of various oscillations as described above. Then, an index for identifying oscillations when the friction of the gland packing 109 is strong and weak was found. Specifically, the relationship between the amplitude of the oscillation and the speed of the oscillation becomes an index for identification.

[0043] If the friction of the gland packing 109 is strong, the static friction acts stronger relative to the driving force of the valve shaft 104. Therefore, it is difficult for the valve shaft 104 to move, and a driving force exceeding the static friction is temporarily applied. If the static friction is exceeded, it drops to dynamic friction, but due to the rising driving force, the valve shaft 104 becomes a sharp movement. As a result, compared with the amplitude of the oscillation, the speed of the oscillation (the maximum speed during several oscillations of moving up and down) becomes larger.

[0044] On the other hand, if the friction of the gland packing 109 is weak, the valve shaft 104 becomes too easy to move. Therefore, it falls into the same force relationship (equilibrium) as the high gain of the controlled object in feedback control, and thus becomes an oscillation of smooth up and down movement. As a result, compared with the amplitude of the oscillation, the speed of the oscillation (the maximum speed during several oscillations of moving up and down) becomes smaller.

[0045] [First Embodiment]

[0046] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 It is a block diagram showing the configuration of a valve maintenance assistance device according to the first embodiment of the present invention. In the following embodiments, for the sake of simplicity of explanation, it is assumed that the example of the valve ID (identification information) is simpler than the example used in an actual factory.

[0047] The valve maintenance assistance device includes: a valve ID storage unit 1 that pre-stores the IDs of a plurality of valves that may be candidates for maintenance; an opening degree acquisition unit 2 that acquires the opening degree command value given to the valve and the actual opening degree value of the valve; an opening degree command value storage unit 3 that stores the data of the opening degree command value corresponding to the ID of the valve that is the data source; an opening degree measurement value storage unit 4 that stores the data of the actual opening degree value corresponding to the ID of the valve that is the data source; a stable data extraction unit 5 that explores the data of the opening degree command value in the opening degree command value stored in the opening degree command value storage unit 3 that continuously indicates a substantially constant value for the same valve in a stable state, and extracts the actual opening degree value of the valve whose given opening degree command value becomes a stable state and is the actual opening degree value in the time period corresponding to the stable state opening degree command value as diagnostic data; an oscillation determination unit 6 that determines whether the diagnostic data has an oscillation state of moving up and down at a substantially constant period with the stable state opening degree command value in between; a friction determination unit 7 that, when the oscillation determination unit 6 determines that the diagnostic data has an oscillation state, determines whether the friction of the gland packing is too strong based on the oscillation speed and the oscillation up and down movement amplitude; a friction determination unit 8 that, when the oscillation determination unit 6 determines that the diagnostic data has an oscillation state, determines whether the friction of the gland packing is too weak based on the oscillation speed and the oscillation up and down movement amplitude; and a determination result presentation unit 9 that presents (displays) the ID of the valve determined to have too strong or too weak friction of the gland packing as the ID of the valve with a problem in the gland packing.

[0048] Figure 2 , Figure 3 is a flowchart for explaining the operation of the valve maintenance assistance device of this embodiment. In this embodiment, for example, there are 26 valves in the equipment, and unique IDs such as "A", "B", "C",..., "M",..., "X", "Y", "Z" are respectively pre-assigned to these 26 valves. In this embodiment, in particular, the valves with valve IDs "A", "C", "M" are the valves selected as the most priority maintenance objects in a specific regular factory maintenance, and the IDs "A", "C", "M" are pre-stored in the valve ID storage unit 1.

[0049] The positioner ([ Figure 7 102) used for each valve supplies the air pressure corresponding to the difference between the opening degree command value SP (valve stem position command value) given from the upper device and the actual opening degree value PV (valve stem position measurement value) of the valve to the actuator ([ Figure 7 103).

[0050] For the valves whose valve IDs are registered in the valve ID storage unit 1, the opening degree acquisition unit 2 acquires the data of the opening degree command value SP and the actual opening degree value PV from the positioners of the respective valves ([ Figure 2 step S100).

[0051] The opening degree acquisition unit 2 stores the data of the opening degree command value SP, the ID of the valve that is the data transmission source, and the information of the data reception time in the opening degree command value storage unit 3 ( Figure 2 step S101). In addition, the opening degree acquisition unit 2 stores the data of the actual opening degree value PV, the ID of the valve that is the data transmission source, and the information of the data reception time in the opening degree measurement value storage unit 4 ( Figure 2 step S102).

[0052] The ID of the valve only needs to be the valve ID sent by the valve positioner attached to the data of the opening degree command value SP and the actual opening degree value PV obtained by the opening degree acquisition unit 2. The information of the time can be attached on the valve positioner side or by the opening degree acquisition unit 2.

[0053] In this way, by repeating the processes of steps S100 to S102, the time series data of the opening degree command value SP and the actual opening degree value PV are accumulated in the opening degree command value storage unit 3 and the opening degree measurement value storage unit 4 respectively.

[0054] Next, the stable data extraction unit 5 searches for the data of the opening degree command value SP in the opening degree command value SP stored in the opening degree command value storage unit 3 that continuously indicates a substantially constant value for the same valve ( Figure 3 step S103). Then, the stable data extraction unit 5 extracts, from the actual opening degree value PV stored in the opening degree measurement value storage unit 4, the actual opening degree value PV of the valve (valve with the same ID) for which the given opening degree command value SP becomes a stable state and is the actual opening degree value PV in the time period corresponding to the stable state opening degree command value SP as diagnostic data ( Figure 3 step S104).

[0055] The stable state where the opening degree command value SP continuously indicates a substantially constant value means, for example, a state where the opening degree command value SP is within the range of SPref ± α (α is the allowable range) with respect to the reference value SPref (for example, the latest average value) for a period of time Tconst or more. The actual opening degree value PV in the time period corresponding to the stable state opening degree command value SP means the actual opening degree value PV from the start time of the stable state of the opening degree command value SP to the time when a period of time Td has elapsed after the end of the stable state. There is a response delay of the valve with respect to the opening degree command value SP. The time considering this response delay can be set as the period of time Td. However, the detection method of the stable state and the extraction method of the diagnostic data in this embodiment are examples, and of course other methods can also be adopted.

[0056] The oscillation determination unit 6 determines whether the diagnostic data extracted for the stable state opening degree command value SP has an oscillation state of moving up and down with a substantially constant period with the stable state opening degree command value SP sandwiched therebetween.Figure 3 in step S105).

[0057] Figure 4 of (A), Figure 4 of (B) is a diagram showing an example of an oscillating state of diagnostic data (actual opening value PV) at a substantially constant period. Figure 4 of (A) shows an example of oscillation in the case of strong friction of the gland packing, Figure 4 of (B) shows an example of oscillation in the case of weak friction of the gland packing.

[0058] When the oscillation determination unit 6 determines that the diagnostic data changes in the vertical movement amplitude exceeding a preset vertical movement threshold, it is determined that the diagnostic data moves up and down. In addition, when the time change rate between the vertical movement peaks (maximum / minimum) of the diagnostic data is within the range of a preset change rate threshold, it is determined that it is a substantially constant period. The oscillation detection method of this embodiment is an example, and of course, other methods can also be adopted.

[0059] When the oscillation determination unit 6 determines that the diagnostic data has an oscillating state with a substantially constant period (step S105 is "yes"), the friction determination unit 7 determines whether the friction of the gland packing is too strong based on the oscillation speed and the vertical movement amplitude of the oscillation ( Figure 3 step S106).

[0060] Specifically, when the ratio ΔH_max / H of the oscillation speed ΔH_max (the maximum speed of the change in the diagnostic data detected by the vertical movement of the oscillation) to the vertical movement amplitude H (the representative value of the vertical movement amplitude of several oscillations) is greater than the first specified value T1 (ΔH_max / H > T1), the friction determination unit 7 determines that the friction of the gland packing is too strong (the gland packing is over-tightened). As the representative value of the vertical movement amplitude (the difference between the maximum value and the minimum value), for example, there is an average value of the vertical movement amplitudes of several oscillations.

[0061] On the other hand, when the oscillation determination unit 6 determines that the diagnostic data has an oscillating state with a substantially constant period (in step S105 is "yes"), the friction determination unit 8 determines whether the friction of the gland packing is too weak based on the oscillation speed and the vertical movement amplitude of the oscillation ( Figure 3 step S107).

[0062] Specifically, when the ratio ΔH_max / H of the oscillation speed ΔH_max to the vertical movement amplitude H (the representative value of the vertical movement amplitude of several oscillations) is smaller than the second specified value T2 (T1 > T2) (ΔH_max / H < T2), the friction determination unit 8 determines that the friction of the gland packing is too weak (the gland packing is made too loose).

[0063] The determination result notification unit 9 notifies the work supervisor of the ID of the valve determined to have a packing problem (excessive or insufficient friction) among the valves whose valve IDs are registered in the valve ID storage unit 1, together with the details of the problem (excessive or insufficient). Figure 3 (Step S108).

[0064] However, the determination result notification unit 9 may also notify (display) one of the messages "Excessive friction of the packing", "Insufficient friction of the packing", and "No problem with the packing" for all the valves whose valve IDs are registered in the valve ID storage unit 1. In this case, the work supervisor (operator) can also confirm the valve ID for the valves for which the determination result of the packing is that there is no problem.

[0065] In this way, the processes of steps S100 to S108 are performed regularly. Figure 3 In addition, one of the processes of the friction determination unit 7 and the friction determination unit 8 may be omitted, and the determination result implemented by one of them may be notified (displayed).

[0066] In this embodiment, by monitoring the oscillation phenomenon of the valve, it is possible to detect problems with the packing and assist the work supervisor in selecting the valves to be maintained.

[0067] [Second Embodiment]

[0068] Next, a second embodiment of the present invention will be described. This embodiment describes an installation example of the first embodiment. Figure 5 FIG. is a diagram showing the configuration of the equipment and its equipment management system, and the same reference numerals are given to the same configurations as Figure 8 those described above.

[0069] In the machinery and equipment system of oil and chemical plants, a management device 10 for controlling and managing each piece of equipment in the plant is provided. Regarding the valve ID storage unit 1, the opening degree acquisition unit 2, the opening degree command value storage unit 3, and the opening degree measurement value storage unit 4 described in the first embodiment, since a large amount of information of the equipment plant needs to be processed, it is preferably installed in the management device 10.

[0070] On the other hand, the stable data extraction unit 5, the oscillation determination unit 6, the friction determination units 7 and 8, and the determination result notification unit 9 generally provide necessary processing only when determining whether valve maintenance is required. In addition, the maintenance implementer (work supervisor of the maintenance contractor) generally performs the maintenance of the plant under the entrustment of the plant owner enterprise. Therefore, assuming that an unspecified number of devices are the objects, it is preferable to install the stable data extraction unit 5, the oscillation determination unit 6, the friction determination units 7 and 8, and the determination result notification unit 9 in the portable computer 11 carried by the work supervisor (operator) of the maintenance contractor.

[0071] During the maintenance operation, the management device 10 of the factory and the computer 11 are temporarily connected using a communication function such as Ethernet (registered trademark).

[0072] When the operator starts the application software on the computer 11, the CPU (Central Processing Unit) of the computer 11 executes processing according to the program stored in the memory, realizing the functions of the stable data extraction unit 5, the oscillation determination unit 6, the friction determination units 7, 8, and the determination result presentation unit 9.

[0073] The determination result presentation unit 9 reads the valve ID from the valve ID storage unit 1 on the management device 10, and reads the determination results of the friction determination units 7, 8, and displays the determination results on the display of the computer 11 ( Figure 3 step S108).

[0074] Based on the displayed valve ID, the operator confirms the valves for which the gland packing inspection should be particularly noted. After the operator confirms the displayed items, the connection between the computer 11 and the management device 10 is released.

[0075] In this way, the valve maintenance assistance device described in the first embodiment can be applied to an actual factory.

[0076] The valve maintenance assistance device described in the first and second embodiments is implemented by a computer having a CPU, a storage device, and an interface; and a program that controls these hardware resources. Figure 6 This shows a configuration example of the computer. The computer includes a CPU 300, a storage device 301, and an interface device (I / F) 302. For example, a valve, a management device, a display, etc. are connected to the I / F 302. In such a computer, the program for implementing the valve maintenance assistance method of the present invention is stored in the storage device 301. The CPU 300 executes the processing described in the first embodiment and the second embodiment according to the program stored in the storage device 301.

[0077] In addition, as shown in the second embodiment, when the valve maintenance assistance device is divided and installed in the management device 10 and the computer 11, these devices can be implemented with Figure 6 such a configuration.

[0078] [Industrial Applicability]

[0079] The present invention can be applied to the technology for assisting valve maintenance work.

[0080] Symbol Explanation

[0081] 1…Valve ID storage unit, 2…Opening degree acquisition unit, 3…Opening degree command value storage unit, 4…Measured opening degree storage unit, 5…Stable data extraction unit, 6…Oscillation determination unit, 7, 8…Friction determination unit, 9…Determination result prompting unit, 10…Management device, 11…Computer.

Claims

1. A valve maintenance assistance device, characterized in that, Comprising: An opening command value storage unit configured to store data of an opening command value given to a valve in correspondence with the ID of the valve that is the data transmission source; An opening measurement value storage unit configured to store data of the actual opening value of the valve in correspondence with the ID of the valve that is the data transmission source; A stable data extraction unit configured to search for data of an opening command value in a stable state that continuously indicates a certain value for the same valve among the opening command values stored in the opening command value storage unit, and extract the actual opening value of the valve for which the given opening command value becomes the stable state and the actual opening value during the time period corresponding to the opening command value in the stable state as diagnostic data; An oscillation determination unit configured to determine whether the diagnostic data has an oscillation state of moving up and down at a certain period with the opening command value in the stable state in between; A friction determination unit configured to, when the oscillation determination unit determines that the diagnostic data has an oscillation state, determine that the gland packing friction is too strong when the ratio of the oscillation speed to the oscillation up and down movement amplitude is greater than a first specified value, and determine that the gland packing friction is too weak when the ratio of the oscillation speed to the oscillation up and down movement amplitude is less than a second specified value; And A determination result presentation unit configured to present the ID of the valve determined to have too strong gland packing friction as the ID of the valve with too strong gland packing friction, and present the ID of the valve determined to have too weak gland packing friction as the ID of the valve with too weak gland packing friction.

2. A valve maintenance assistance method, characterized in that, Comprising: A first step of storing data of an opening command value given to a valve in correspondence with the ID of the valve that is the data transmission source; A second step of storing data of the actual opening value of the valve in correspondence with the ID of the valve that is the data transmission source; A third step of searching for data of an opening command value in a stable state that continuously indicates a certain value for the same valve among the opening command values stored in the first step, and extracting the actual opening value of the valve for which the given opening command value becomes the stable state and the actual opening value during the time period corresponding to the opening command value in the stable state as diagnostic data; A fourth step of determining whether the diagnostic data has an oscillation state of moving up and down at a certain period with the opening command value in the stable state in between; A fifth step of, when it is determined in the fourth step that the diagnostic data has an oscillation state, determining that the gland packing friction is too strong when the ratio of the oscillation speed to the oscillation up and down movement amplitude is greater than a first specified value, and determining that the gland packing friction is too weak when the ratio of the oscillation speed to the oscillation up and down movement amplitude is less than a second specified value; And A sixth step of presenting the ID of the valve determined to have too strong gland packing friction as the ID of the valve with too strong gland packing friction, and presenting the ID of the valve determined to have too weak gland packing friction as the ID of the valve with too weak gland packing friction.

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