JP7265328B2 - VALVE MAINTENANCE SUPPORT DEVICE AND SUPPORT METHOD - Google Patents

Description

TECHNICAL FIELD The present invention relates to a technique for assisting maintenance work, and more particularly to a valve maintenance assisting device and assisting method that realizes assisting efficient maintenance work for ON-OFF valves.

Valves used in petrochemical plants (for example, control valves in FIG. 15) require particular attention to safety, and are therefore regularly maintained. The control valve shown in FIG. 15 includes a valve body 100 that opens and closes a fluid passage, a positioner 101 that converts an input electrical signal into air pressure, and an operating device that operates the valve body 100 according to the air pressure supplied from the positioner 101. 102.

In order to improve the efficiency of valve maintenance work in a plant where a large number of valves are installed as shown in FIG. A technique for determining a hunting state (see Patent Document 2), a technique for detecting adhesion of scale to a valve (see Patent Document 3), and the like have been proposed.

On the other hand, as a type of valve different from the control valve that can continuously change the degree of opening, there is an ON-OFF valve that can only take two positions of full open / full close, such as a ball valve. , butterfly valves and gate valves. The ON-OFF valve shown in FIG. 16 uses a ball valve, and has a structure in which a ball 200 as a valve body is sandwiched between seat rings 201 called a ball seat. The valve can be opened or closed by turning it by degrees. Moreover, depending on the type, there are those other than 90 degrees.

Most of the ON-OFF valves use electromagnetic valves, and the answerback using limit switches represents only two states, closed or open. In this case, the process of opening and closing the valve is not reflected in the answerback. In other words, the answerback function of the ON-OFF valve only issues an alarm in the event of an abnormality, and if an emergency abnormality is already occurring when the alarm is issued, it will be too late to take action.

Regarding safety and work efficiency, there is no upper limit that can be said to be perfect or sufficient, and further improvements in safety and work efficiency are required. In particular, petrochemical plants and the like use a plurality of valves 10-A, 10-C, and 10-M as shown in FIG. 17, for example. Therefore, there is a demand for further improvement in the work efficiency of valve maintenance.

Japanese Patent No. 3254624 Japanese Patent No. 6200309 Japanese Patent No. 6216633

SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve maintenance support device and a support method capable of improving the work efficiency of ON-OFF valve maintenance.

A valve maintenance support device according to the present invention includes a valve ID storage unit configured to store IDs of ON-OFF valves that can be candidates for maintenance in advance, and an opening meter provided for each ON-OFF valve. an opening storage unit configured to store the opening measurement value data together with the ID of the ON-OFF valve; and the opening measurement value for the ON-OFF valve whose ID is stored in the valve ID storage unit. a diagnostic index calculation unit configured to calculate a required opening/closing time as a diagnostic index based on data; and a diagnostic index presentation unit configured to present the numerical value of the diagnostic index calculated by the diagnostic index calculation unit. a determination unit configured to compare the required opening/closing time calculated as the diagnostic index with a corresponding threshold value defined in advance; and a determination result presentation unit configured to present the determination result of the determination unit. wherein the required opening/closing time is at least one of the required time for opening from 0% to 100% and the required time for closing from 100% to 0%; A value smaller than the timer upper limit is set based on a timer upper limit indicating the maximum allowable value of the required opening/closing time, and the determination result presenting unit determines ON-OFF when the numerical value of the required opening/closing time is equal to or greater than the threshold value. It is characterized by presenting the ID of the valve for the valve .
Further, in one configuration example of the valve maintenance support device of the present invention, the threshold value is a value of 1/2 of the timer upper limit.
Further, in one configuration example of the valve maintenance support device of the present invention, the threshold is set individually for each of the opening operation and the closing operation, and the threshold corresponding to the opening operation is changed from 0% to 100% opening. The threshold value corresponding to the closing operation is based on the upper limit of the closing timer that indicates the maximum allowable time required for opening 100% to 0%. The determination result presenting unit determines that at least one of the time required for opening 0% to 100% and the time required for closing 100% to 0% is equal to or greater than a corresponding threshold value. This is characterized by presenting the ID of this valve for the determined ON-OFF valve.

Further, the valve maintenance support method of the present invention includes a first step of storing opening measurement value data transmitted from an opening meter provided for an ON-OFF valve together with the ID of the ON-OFF valve; a second step of calculating a required opening/closing time as a diagnostic index based on the opening measurement value data for an ON-OFF valve that can be a candidate for maintenance and whose ID is stored in the ID storage unit; and this second step. a third step of presenting the numerical value of the diagnostic index calculated in the above; a fourth step of comparing the required opening/closing time calculated as the diagnostic index with a corresponding threshold value defined in advance; and a fifth step of presenting the result, wherein the required opening/closing time is at least the required time for opening from 0% to 100% and the required time for closing from 100% to 0%. On the other hand, the threshold value is set to a value smaller than the timer upper limit based on a timer upper limit indicating the maximum allowable value of the required opening/closing time, and the fifth step comprises the opening/closing in the fourth step. The method is characterized by including a step of presenting an ID of an ON-OFF valve for which the numerical value of the required time is determined to be equal to or greater than the threshold value.
In one configuration example of the valve maintenance support method of the present invention, the threshold is a value that is half the timer upper limit.
Further, in one configuration example of the valve maintenance support method of the present invention, the threshold is set individually for each of the opening operation and the closing operation, and the threshold corresponding to the opening operation is changed from 0% to 100% opening. The threshold value corresponding to the closing operation is based on the upper limit of the closing timer that indicates the maximum allowable time required for opening 100% to 0%. In the fifth step , at least one of the time required for opening from 0% to 100% and the time required for closing from 100% to 0% is equal to or greater than the corresponding threshold value. This is characterized by presenting the ID of this valve for the determined ON-OFF valve.

According to the present invention, for an ON-OFF valve whose ID is stored in the valve ID storage unit, the required opening/closing time is calculated as a diagnostic index based on the opening measurement value data, and the numerical value of this diagnostic index is presented. , it is possible to grasp the operation change of the ON-OFF valve before the time required for opening and closing reaches the upper limit, and it is possible to assist the operator in selecting the ON-OFF valve that is a candidate for maintenance. As a result, in the present invention, it is possible to improve the working efficiency of maintenance of the ON-OFF valve.

Further, in the present invention, the maximum operating speed and the minimum operating speed are calculated as diagnostic indexes based on the opening measurement value data for the ON-OFF valves whose IDs are stored in the valve ID storage unit, and the numerical values of these diagnostic indexes are calculated. By presenting , it is possible to grasp the operation change of the ON-OFF valve before the operating speed reaches the upper limit, and it is possible to assist the operator in selecting the ON-OFF valve that is a candidate for maintenance. As a result, in the present invention, it is possible to improve the working efficiency of maintenance of the ON-OFF valve.

FIG. 1 is a block diagram showing the configuration of a valve maintenance support device according to a first embodiment of the invention. FIG. 2 is a flow chart for explaining the operation of the valve maintenance support device according to the first embodiment of the present invention. FIG. 3 is a diagram showing one example of the structure of the ON-OFF valve according to the first embodiment of the present invention. FIG. 4 is a block diagram showing the configuration of an ON-OFF valve opening meter according to the first embodiment of the present invention. FIG. 5 is a diagram showing an example of the opening operation of the ON-OFF valve. FIG. 6 is a diagram showing an example of the closing operation of the ON-OFF valve. FIG. 7 is a diagram showing an example of presentation of diagnostic indices by the diagnostic index presenting unit and determination result presenting unit of the valve maintenance support device according to the first embodiment of the present invention. FIG. 8 is a diagram showing the configuration of a plant and its equipment management system according to the second embodiment of the present invention. FIG. 9 is a block diagram showing the configuration of a valve maintenance support device according to a reference example of the present invention. FIG. 10 is a flow chart explaining the operation of the valve maintenance support device according to the reference example of the present invention. FIG. 11 is a diagram showing an example of maximum and minimum actuation speeds of an ON-OFF valve in normal conditions. FIG. 12 is a diagram showing an example in which the maximum actuation speed and minimum actuation speed of the ON-OFF valve are reduced. FIG. 13 is a diagram showing an example in which the maximum operating speed and minimum operating speed of the ON-OFF valve are increased. FIG. 14 is a block diagram showing a configuration example of a computer that implements the valve maintenance support device according to the first and second embodiments and the reference example of the present invention. FIG. 15 is a diagram showing an example of a control valve. FIG. 16 is a diagram showing an example of an ON-OFF valve. FIG. 17 is a diagram showing an example of multiple valves used in a plant tank.

[Principle of Invention]
Most of the ON-OFF valves have a simple structure using solenoid valves. The inventors have focused on the fact that such a simple structure makes it possible to easily understand the symptom of malfunction of the ON-OFF valve. They also found that the operating speed of the ON-OFF valve slows down due to the adhesion of scale (highly viscous substances and large particles enter the sliding part) mainly on the sliding part of the ON-OFF valve. . In addition, the ON-OFF valve may operate at a faster speed than usual due to wear of the ON-OFF valve seal parts (gland packing and gasket) and loss of the original frictional force (for example, the inner valve). Occurrence of jumping when the valve is opened due to biting).

Then, the inventor installs a sensor that can detect the valve opening/closing operation (stroke) on the ON-OFF valve, and detects and presents the behavior from the change in the slope of the opening/closing operation (or the maximum operation speed and minimum operation speed). I came up with the idea that it would be possible to estimate the failure of the ON-OFF valve. As a result, the present invention can improve the work efficiency of maintenance of the ON-OFF valve.

[First embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a valve maintenance support device according to a first embodiment of the present invention. This embodiment is an example of detecting the behavior of the ON-OFF valve from the inclination of the opening/closing operation. In the following examples, for the sake of brevity, the valve ID case etc. will be simpler than those used in an actual plant.

The valve maintenance support device includes a valve ID storage unit 1 for pre-storing IDs (identification information) of a plurality of ON-OFF valves that can be candidates for maintenance, a receiving unit 2 for receiving the degree measured value data; and an opening degree storage unit 3 for storing the degree of opening measured value data transmitted from the degree of opening meter provided for the ON-OFF valve together with the ID of the ON-OFF valve. , a diagnostic index calculation unit 4 for calculating, as a diagnostic index, the opening/closing time required for an ON-OFF valve whose ID is stored in the valve ID storage unit 1 based on the opening measurement value data; a diagnostic index presenting unit 5 for presenting the numerical value of the diagnostic index obtained; a determining unit 6 for comparing the required opening/closing time calculated as the diagnostic index with a predetermined corresponding threshold; and presenting the determination result of the determining unit 6, For an ON-OFF valve whose numerical value of required opening/closing time is determined to be equal to or greater than the corresponding threshold value, a determination result presenting unit 7 is provided for presenting the ID of this valve and the numerical value equal to or greater than the threshold value in an unusual format.

FIG. 2 is a flowchart for explaining the operation of the valve maintenance support device of this embodiment. In this embodiment, for example, assuming that there are 26 valves in the plant, these 26 valves have "A", "B", "C", . . . , "M", . , “Y” and “Z” are assigned in advance. In particular, valves with valve IDs "A", "C", and "M" are ON-OFF valves using solenoid valves, and these IDs "A", "C", and "M" are stored in the valve ID storage unit 1. is stored in advance.

Each of the ON-OFF valves with valve IDs "A", "C", and "M" is provided with an opening meter so that the valve opening can be continuously measured. FIG. 3 is a diagram showing an example of the structure of the ON-OFF valve of this embodiment, in which an opening meter 204 is added to the ON-OFF valve shown in FIG. The additional position of the opening meter 204 is not limited to the position shown in FIG. 16, and may be any position where the opening can be measured.

FIG. 4 is a block diagram showing the configuration of the opening meter 204. As shown in FIG. The opening meter 204 includes an opening measuring unit 210 that continuously measures the valve opening by continuously detecting the rotation angle of a stem (valve rod) 202 of the ON-OFF valve, and the opening meter 204. Equipped with a valve ID storage unit 211 that stores a valve ID unique to the attached ON-OFF valve, and a transmission unit 212 that periodically transmits the opening measurement value data and the valve ID to the valve maintenance support device. ing.

The transmission unit 212 adds the valve ID stored in the valve ID storage unit 211 to the opening measurement value data and transmits the data. In addition, since it is necessary to continuously acquire the opening of the ON-OFF valve, the measurement and transmission cycle of the opening measurement value data should be shorter than the minimum possible opening and closing time of the ON-OFF valve. is necessary.

When the receiving unit 2 of the valve maintenance support device receives the opening measurement value data from each ON-OFF valve (YES in step S100 in FIG. 2), the received opening measurement value data and the opening measurement value data are added. The valve ID and the reception time of the measured opening value data are stored in the opening storage unit 3 (step S101 in FIG. 2).

Subsequently, the diagnostic index calculation unit 4 of the valve maintenance support device stores in the opening degree storage unit 3 each ON-OFF valve that can be a candidate for maintenance and whose valve ID is registered in the valve ID storage unit 1. The required opening/closing time is calculated as a diagnostic index based on the opening measurement value data (step S102 in FIG. 2).

In this embodiment, as the opening/closing time of the ON-OFF valve, the required time TOP for the opening degree 0%→100% and the required time TCL for the opening degree 100%→100% are calculated. As described above, since the opening measurement value data obtained in chronological order, the valve ID, and the reception time of the opening measurement value data are stored in the opening storage unit 3, the required opening/closing time is ON-OFF. It can be calculated for each valve and for each direction of actuation.

The diagnostic index presenting unit 5 of the valve maintenance support device presents to the operator the numerical value of the diagnostic index of each ON-OFF valve calculated by the diagnostic index calculating unit 4 (step S103 in FIG. 2). At this time, the diagnostic index presenting unit 5 presents information indicating that the ON-OFF valve, which can be a candidate for maintenance, is being diagnosed, together with the numerical value of the diagnostic index.

In the present embodiment, such a presentation quantitatively indicates the necessity of paying attention to the ON-OFF valve to the operator who has little knowledge about the necessity of maintenance of the ON-OFF valve. It is possible to reduce the risk of check leakage of the ON-OFF valve.

On the other hand, the determination unit 6 of the valve maintenance support device determines whether or not the diagnostic index of each ON-OFF valve whose valve ID is registered in the valve ID storage unit 1 is equal to or greater than a predetermined threshold value TH for each valve. (Step S104 in FIG. 2). In this embodiment, both the required time TOP for opening 0% to 100% and the required time TCL for opening 100% to 0% are calculated as diagnostic indices for the ON-OFF valve. The determination unit 6 may compare each of these required times TOP and TCL with the threshold value TH.

The determination result presentation unit 7 of the valve maintenance support device presents the determination result of the determination unit 6 to the operator (step S105 in FIG. 2). Specifically, the determination result presenting unit 7 displays the ID of the ON-OFF valve for which at least one of the required opening/closing times TOP and TCL is determined to be equal to or greater than the corresponding threshold, and the numerical value equal to or greater than the threshold as normal. It can be displayed in a different format (e.g. in red).
In this way, the processing of steps S100 to S105 in FIG. 2 is performed periodically or when the operator instructs execution of diagnosis.

FIG. 5 is a diagram showing an example of the opening operation of the ON-OFF valve, and FIG. 6 is a diagram showing an example of the closing operation of the ON-OFF valve.
FIG. 5 shows that the ON-OFF valve, which had been opening as shown in OP1 in a normal state, changes its characteristics in the order of OP1→OP2→OP3, and the required time TOP for opening from 0% to 100% is reduced. It shows an example of progressive delay. TOPmax in FIG. 5 is the upper limit of the opening side timer indicating the maximum allowable value of the required time TOP for the opening degree of the ON-OFF valve from 0% to 100%.

On the other hand, FIG. 6 shows that the ON-OFF valve, which was closed as indicated by CL1 in the normal state, changes its characteristics from CL1 to CL2 to CL3, and the time required for opening 100% to 0%. It shows an example where the TCL is getting progressively slower. TCLmax in FIG. 6 is the upper limit of the closing timer indicating the maximum allowable value of the required time TCL for the opening of the ON-OFF valve from 100% to 0%.

It is preferable that the threshold value TH is smaller than the opening/closing timer upper limits TOPmax and TCLmax in order to catch a change (indication) in the operation of the ON-OFF valve before the required opening/closing time reaches the opening/closing timer upper limits TOPmax and TCLmax.

FIG. 7 is a diagram showing an example of presentation of diagnostic indices by the diagnostic index presenting unit 5 and the determination result presenting unit 7. In FIG. In the example of FIG. 7, diagnostic indicators of valves with valve IDs "A", "C", and "M" are displayed in a region 500 of the screen 50 displayed by the diagnostic indicator display unit 5. FIG. The diagnostic index presentation unit 5 displays information in an area 501 of the screen 50 indicating that the ON-OFF valve is to be diagnosed. Further, the diagnostic index presenting unit 5 uses image data prepared in advance to display a piping instrumentation diagram 502 of the location where the ON-OFF valve to be diagnosed is arranged on the screen 50 as shown in FIG. You may make it display.

In this embodiment, the threshold value TH is set to 1.5 seconds (half the value of TOPmax and TCLmax described above). In the example of FIG. 7, among the diagnostic indicators of the ON-OFF valve with the valve ID "M", the time required for opening 0% to 100% is 1.8 seconds, and the time required for opening 100% to 0% is 1.8 seconds. 1.7 seconds. For this reason, the determination result presentation unit 7 displays the numerical value of the required opening/closing time and the valve ID in a color different from the required opening/closing time of other ON-OFF valves (white on black in the example of FIG. 7). .

In this way, in this embodiment, it is possible to grasp the operation change (symptom) of the ON-OFF valve before the time required for opening and closing reaches the upper limit TOPmax and TCLmax of the opening and closing timer, and the operator selects the ON-OFF valve as a candidate for maintenance. can support

In this embodiment, both the required time TOP for opening 0% to 100% opening and the required time TCL for closing 100% to 0% are calculated as diagnostic indices. However, only one of them may be calculated and compared with the threshold TH.

In this embodiment, the threshold value TH for the opening operation and the closing operation is set to the same value. and the closing-side timer upper limit TCLmax may also have different values. Therefore, when calculating the required opening/closing times TOP and TCL for both the opening operation and the closing operation as in the present embodiment, the corresponding threshold values TH for the opening operation and the closing operation are set individually. You can leave it.

[Second embodiment]
Next, a second embodiment of the invention will be described. This embodiment describes an implementation example of the first embodiment. FIG. 8 is a diagram showing the configuration of a plant and its equipment management system. In this embodiment, ON-OFF valves 10-A and 10-M with valve IDs "A" and "M" are arranged in the flow path 11-1, and ON-OFF valve 10-C with valve ID "C". is arranged in the channel 11-3. In FIG. 8, 12-A, 12-C, and 12-M are flowmeters, 13 is a tank, and 14 is a pressure transmitter. In FIG. 8, valves other than those having valve IDs "A", "C", and "M" are omitted.

An equipment management system for petroleum and chemical plants is provided with a management device 15 that controls and manages each equipment of the plant. The valve ID storage unit 1, the reception unit 2, the opening storage unit 3, and the diagnostic index calculation unit 4 described in the first embodiment handle a huge amount of plant-specific information, so they should be implemented in the management device 15. is preferred.

On the other hand, the diagnostic index presenting unit 5, the determining unit 6, and the determination result presenting unit 7 basically provide necessary processing only when it is determined whether maintenance of the valve is required. Also, maintenance operators (persons in charge of maintenance contractor companies) are generally commissioned by plant owner companies to carry out plant maintenance. Therefore, assuming that an unspecified number of plants will be targeted, a portable computer 16 carried by a person in charge (operator) of a maintenance contractor company has a diagnostic index presentation unit 5, a determination unit 6, and a determination result presentation unit. 7 is preferably implemented.

The plant management device 15 and the computer 16 are temporarily connected using a communication function such as Ethernet (registered trademark) during maintenance work.
When the operator starts the application software on the computer 16, the CPU of the computer 16 executes processing according to the programs stored in the memory, and functions as the diagnostic index presenting section 5, the determining section 6, and the determination result presenting section 7. come true.

The diagnostic index presentation unit 5 reads the valve ID from the valve ID storage unit 1 on the management device 15, reads the diagnostic index of each ON-OFF valve calculated by the diagnostic index calculation unit 4, and displays it on the display of the computer 16. (step S103 in FIG. 2). Also, the determination result presentation unit 7 displays the determination result of the determination unit 6 on the display of the computer 16 (step S105 in FIG. 2).

Based on the displayed valve ID, diagnostic index, and judgment result, the operator confirms the ON-OFF valves that require particular attention. After confirming the displayed items, the operator disconnects the computer 16 and the management device 15 .
Thus, the valve maintenance support device described in the first embodiment can be applied to an actual plant.

[ Reference example ]
Next, a reference example of the present invention will be described. This reference example is an example of detecting the behavior of an ON-OFF valve from the maximum operating speed and the minimum operating speed. FIG. 9 is a block diagram showing the configuration of the valve maintenance support device according to this reference example , and the same components as in FIG. 1 are given the same reference numerals.

The valve maintenance support device of this reference example includes a valve ID storage unit 1, a reception unit 2, an opening storage unit 3, and an opening measurement value for an ON-OFF valve whose ID is stored in the valve ID storage unit 1. a diagnostic index calculation unit 4a for calculating the maximum operating speed and the minimum operating speed as diagnostic indices based on data; a diagnostic index presentation unit 5 for presenting numerical values of the diagnostic indices calculated by the diagnostic index calculation unit 4a; A determining unit 6a that compares the maximum operating speed and the minimum operating speed calculated as each with a corresponding threshold value defined in advance, and presents the determination result of the determining unit 6a. For an ON-OFF valve for which at least one has been determined to be equal to or greater than the corresponding threshold value, a determination result presenting unit 7 is provided for presenting the ID of this valve and the numerical value equal to or greater than the threshold value in an unusual format.

FIG. 10 is a flowchart for explaining the operation of the valve maintenance support device of this reference example . The operations of the receiving section 2 and the opening storage section 3 (steps S200 and S201 in FIG. 10) are as described in the first embodiment.

Next, the diagnostic index calculation unit 4a of the valve maintenance support device of the present reference example calculates the opening degree storage unit 3 for each ON-OFF valve whose valve ID is registered in the valve ID storage unit 1 and which can be a candidate for maintenance. The maximum operating speed and the minimum operating speed are calculated as diagnostic indices based on the opening measurement value data stored in (step S202 in FIG. 10).

In this reference example , the operating speeds of the ON-OFF valve are the maximum operating speed VOPmax during the opening operation, the minimum operating speed VOPmin during the opening operation, the maximum operating speed VCLmax during the closing operation, and the minimum operation speed VCLmax during the closing operation. The velocity VCLmin is calculated. As described above, the opening measurement value data obtained in chronological order, the valve ID, and the reception time of the opening measurement value data are stored in the opening storage unit 3. It is possible to calculate for each and for each direction of actuation.

The reason for detecting the minimum operating speed in this reference example is as follows. The maximum actuation speed lacks consistency in the rate of change because it captures stick-slip in the sliding parts of the valve and jumping when opening the valve. On the other hand, by detecting the minimum operating speed as in this reference example , factors such as stick-slip and jumping can be eliminated, and the consistency of speed changes can be improved.

The diagnostic index presenting unit 5 of the valve maintenance support device presents to the operator the numerical value of the diagnostic index of each ON-OFF valve calculated by the diagnostic index calculating unit 4a (step S203 in FIG. 10). As in the first embodiment, the diagnostic index presenting unit 5 presents information indicating that the ON-OFF valve is to be diagnosed, together with numerical values of diagnostic indices.

On the other hand, the determination unit 6a of the valve maintenance support device determines whether the absolute value of the diagnostic index of each ON-OFF valve whose valve ID is registered in the valve ID storage unit 1 is equal to or greater than a predetermined threshold value for each valve. Determine (step S204 in FIG. 10). In this reference example , the diagnostic indicators for the ON-OFF valve are the maximum operating speed VOPmax during the opening operation, the minimum operating speed VOPmin during the opening operation, the maximum operating speed VCLmax during the closing operation, and the minimum operation speed VCLmax during the closing operation. The velocity VCLmin is calculated.

The determination unit 6a compares the absolute values of the maximum operating speeds VOPmax, VCLmax during the opening and closing operations with the corresponding maximum operating speed threshold values THmax, and determines the minimum operating speeds VOPmin, VCLmin during the opening and closing operations. can be compared with the corresponding minimum operating speed threshold THmin.

The reason why the absolute value of the actuation speed is compared with the threshold value is that the maximum actuation speed VCLmax and the minimum actuation speed VCLmin during the closing operation in which the ON-OFF valve moves in the direction of decreasing the opening are negative values. .

As in the first embodiment, the threshold value THmax is a value smaller than the upper limit of the maximum operating speed in order to catch a change (indication) in the operation of the ON-OFF valve before the operating speed reaches the upper limit (maximum allowable value). Preferably, the threshold THmin is a value smaller than the upper limit of the minimum operating speed.

The determination result presentation unit 7 of the valve maintenance support device presents the determination result of the determination unit 6a to the operator (step S205 in FIG. 10). Specifically, the determination result presenting unit 7, for an ON-OFF valve for which at least one of the operating speeds VOPmax, VOPmin, VCLmax, and VCLmin has been determined to be equal to or greater than a corresponding threshold value, provides the valve ID and a numerical value equal to or greater than the threshold value. should be displayed in a different format (for example, in red).
Thus, the processing of steps S200 to S205 in FIG. 10 is performed periodically or when the operator instructs execution of diagnosis.

FIG. 11 shows an example of the maximum operating speeds VOPmax, VCLmax and minimum operating speeds VOPmin, VCLmin of the ON-OFF valve in a normal state, and FIG. 12 shows the maximum operating speeds VOPmax, VCLmax and the minimum operating speeds VOPmin, VCLmin decrease. FIG. 13 is a diagram showing an example in which the maximum operating speeds VOPmax, VCLmax and the minimum operating speeds VOPmin, VCLmin increase.
11 to 13, the time on the horizontal axis indicates the time when the operating speeds VOPmax, VCLmax, VOPmin and VCLmin are calculated.

Since the implementation example when the valve maintenance support device of this reference example is applied to an actual plant is the same as that of the second embodiment, the explanation is omitted.
In this way, in this reference example , it is possible to detect changes (indications) in the operation of the ON-OFF valve before the operating speed reaches the upper limit, and it is possible to assist the operator in selecting the ON-OFF valve that is a candidate for maintenance. .

In this reference example , the maximum operating speed VOPmax during the opening operation, the minimum operating speed VOPmin during the opening operation, the maximum operating speed VCLmax during the closing operation, and the minimum operating speed VCLmin during the closing operation are used as diagnostic indices. is calculated, however, only one of the speeds during the opening operation and the closing operation may be calculated and compared with the threshold value.

Further, when calculating the operating speeds for both the opening operation and the closing operation, the maximum operating speed threshold THmax for the opening operation and the maximum operating speed threshold THmax for the closing operation are individually set, and the minimum operating speed for the opening operation is set. The operating speed threshold THmin and the minimum operating speed threshold THmin for the closing operation may be set separately.

The valve maintenance support device described in the first and second embodiments and the reference example is realized by a computer having a CPU (Central Processing Unit), a storage device and an interface, and a program that controls these hardware resources. can be done. A configuration example of this computer is shown in FIG. The computer includes a CPU 300 , a storage device 301 and an interface device (hereinafter abbreviated as I/F) 302 . A valve, a management device, a display, and the like are connected to the I/F 302, for example. In such a computer, a program for realizing the support method of the present invention is stored in the storage device 301 . The CPU 300 executes the processes described in the first and second embodiments and the reference example according to programs stored in the storage device 301 .
Incidentally, when the valve maintenance support device is divided into the management device 15 and the computer 16 and implemented as shown in the second embodiment, each of these may be realized by the configuration shown in FIG.

INDUSTRIAL APPLICABILITY The present invention can be applied to technology for supporting valve maintenance work.

DESCRIPTION OF SYMBOLS 1, 211... Valve ID storage part 2... Receiving part 3... Opening degree storage part 4, 4a... Diagnosis index calculation part 5... Diagnosis index presentation part 6, 6a... Judgment part 7... Judgment result presentation part , 10-A, 10-C, 10-M ... ON-OFF valve, 11-1, 11-3 ... flow path, 12-A, 12-C, 12-M ... flow meter, 13 ... tank, 14 Pressure transmitter 15 Management device 16 Computer 200 Ball 201 Seat ring 202 Stem 203 Actuator 204 Opening meter 210 Opening measurement unit 212 Transmission unit.

Claims (6)

a valve ID storage unit configured to store in advance IDs of ON-OFF valves that can be candidates for maintenance;
an opening storage unit configured to store opening measurement value data transmitted from an opening meter provided to the ON-OFF valve together with the ID of the ON-OFF valve;
a diagnostic index calculation unit configured to calculate a required opening/closing time as a diagnostic index based on the opening measurement value data for an ON-OFF valve whose ID is stored in the valve ID storage unit;
a diagnostic index presenting unit configured to present the numerical value of the diagnostic index calculated by the diagnostic index calculating unit;
a determination unit configured to compare the required opening/closing time calculated as the diagnostic index with a corresponding threshold value defined in advance;
a determination result presentation unit configured to present the determination result of the determination unit;
The required opening/closing time is at least one of the required time for the opening degree from 0% to 100% during the opening operation and the required time for the opening degree from 100% to 0% during the closing operation,
The threshold value is set to a value smaller than the timer upper limit based on the timer upper limit indicating the maximum allowable value of the required opening/closing time,
The valve maintenance support device, wherein the determination result presenting unit presents an ID of the ON-OFF valve for which the numerical value of the required opening/closing time is determined to be equal to or greater than the threshold value. In the valve maintenance support device according to claim 1,
The valve maintenance support device, wherein the threshold is half the value of the timer upper limit. The valve maintenance support device according to claim 1 or 2,
The threshold value is set separately for each of the opening operation and the closing operation, and the threshold value corresponding to the opening operation is based on the upper limit of the open side timer that indicates the maximum allowable value of the time required for opening from 0% to 100%. is a value, and the threshold value corresponding to the closing operation is a value based on the upper limit of the closing timer that indicates the maximum allowable value of the time required for opening 100% to 0%,
The determination result presentation unit determines that at least one of the required time for the opening degree from 0% to 100% during the opening operation and the required time for the opening degree from 100% to 0% during the closing operation is equal to or greater than the corresponding threshold. - A valve maintenance support device characterized by presenting an ID of an OFF valve. a first step of storing the opening measurement value data transmitted from the opening meter provided for the ON-OFF valve together with the ID of the ON-OFF valve;
a second step of calculating a required opening/closing time as a diagnostic index based on the opening measurement value data for an ON-OFF valve that can be a candidate for maintenance and whose ID is stored in the valve ID storage unit;
a third step of presenting the numerical value of the diagnostic index calculated in the second step;
a fourth step of comparing the opening/closing required time calculated as the diagnostic index with a corresponding predetermined threshold value;
and a fifth step of presenting the determination result of the fourth step,
The required opening/closing time is at least one of the required time for the opening degree from 0% to 100% during the opening operation and the required time for the opening degree from 100% to 0% during the closing operation,
The threshold value is set to a value smaller than the timer upper limit based on the timer upper limit indicating the maximum allowable value of the required opening/closing time,
Valve maintenance, wherein the fifth step includes a step of presenting an ID of an ON-OFF valve for which the numerical value of the required opening/closing time is determined to be equal to or greater than the threshold value in the fourth step. how to help. In the valve maintenance support method according to claim 4,
The valve maintenance support method, wherein the threshold is half the value of the timer upper limit. In the valve maintenance support method according to claim 4 or 5,
The threshold value is set separately for each of the opening operation and the closing operation, and the threshold value corresponding to the opening operation is based on the upper limit of the open side timer that indicates the maximum allowable value of the time required for opening from 0% to 100%. is a value, and the threshold value corresponding to the closing operation is a value based on the upper limit of the closing timer that indicates the maximum allowable value of the time required for opening 100% to 0%,
In the fifth step , it is determined that at least one of the time required for opening from 0% to 100% and the time required for closing from 100% to 0% is equal to or greater than the corresponding threshold. - A valve maintenance support method characterized by presenting an ID of an OFF valve.

Images