JP6851938B2 - Valve maintenance support device and method - Google Patents

Description

The present invention relates to a valve maintenance support device and method for supporting valve maintenance work for regulating fluid flow.

Conventionally, valves used in petroleum and chemical plants have to pay particular attention to safety, and for this reason, regular maintenance is performed. FIG. 12 shows an example of a valve (control valve) used in petroleum and chemical plants.

The valve 100 includes a valve body 101, a positioner 102, and an actuator 103. The actuator 103 has a spring-type diaphragm structure, and the valve shaft (valve shaft (diaphragm) 103a of the actuator is displaced against the force of the spring 103b according to the air pressure Po supplied from the positioner 102. The stem) 104 is moved up and down to adjust the opening degree of the valve (the gap between the valve body 105 and the seat ring 106). The positioner 102 detects the lift position of the valve shaft 104, that is, the actual opening degree of the valve from the rotation angle position of the feedback lever 107 connected to the valve shaft 104, and determines the difference between the detected actual opening degree and the set opening degree. The corresponding air pressure Po is supplied to the actuator 103.

Although the valve 100 shown in FIG. 12 uses a reverse actuator as the actuator 103, a normal actuator may be used in some cases. The reverse actuator urges the valve opening in the closing direction by the force of the spring, and the forward actuator urges the valve opening in the opening direction by the force of the spring. Further, in the valve 100 shown in FIG. 12, the actuator 103 is operated by air pressure, but there is also a type in which the actuator 103 is operated by flood control. Further, a fluorine-based V packing 109 in contact with the valve shaft 104 is attached to the gland portion 108 of the valve 100 as a gland packing.

In a plant where such a valve is installed, it is necessary to efficiently maintain a large number of valves, and in order to improve the efficiency of the maintenance work, valve stick slip detection (see, for example, Patent Document 1) and valves Methods such as hunting detection (see, for example, Patent Document 2) and valve scale adhesion detection (see, for example, Patent Document 3) have been proposed.

Japanese Patent No. 3254624 Japanese Unexamined Patent Publication No. 2015-114942 Japanese Unexamined Patent Publication No. 2015-114943

However, there is no complete or sufficient upper limit for safety and efficiency of maintenance work. Since many valves are used in petroleum and chemical plants, further improvement is required for the efficiency of maintenance work.

The present invention has been made to solve such a problem, and an object of the present invention is to improve the efficiency of valve maintenance work, especially when the gland packing is a fluorine-based V packing. To provide valve maintenance support devices and methods that can be used.

In order to achieve such an object, the present invention is a valve maintenance support device (200) that supports maintenance work of a valve (100) that regulates a fluid flow, and measures a valve opening degree (θ). It is transmitted from the pressure measuring unit (22) that measures the opening measurement value data (D1) transmitted from the opening measuring unit (21) and the fluid pressure (Po) supplied to the valve operator (103). Information on the maximum operating speed of the valve based on the measured value data storage unit (1) that stores the incoming pressure measurement value data (D2) and the opening measurement value data stored in the measured value data storage unit is used for the valve. The valve's frictional force index (F) is calculated as a speed index (V), and information on the maximum frictional force of the valve is obtained based on the opening measurement value data and pressure measurement value data stored in the measured value data storage unit. A diagnostic index calculation unit (3) calculated as a valve and a diagnostic index presentation unit (4) that presents a valve diagnostic index by pairing a speed index and a friction force index calculated by the diagnostic index calculation unit are provided. It is a feature.

In the present invention, the measurement value data storage unit stores the opening measurement value data from the opening degree measurement unit and the pressure measurement value data from the pressure measurement unit. The diagnostic index calculation unit calculates information on the maximum operating speed of the valve as a speed index of the valve based on the opening measurement value data stored in the measurement value data storage unit. Further, the diagnostic index calculation unit calculates information on the maximum frictional force of the valve as the frictional force index of the valve based on the opening measurement value data and the pressure measurement value data stored in the measurement value data storage unit. When a gap is created between the gland packing and the valve shaft, the maximum operating speed of the valve increases and the maximum frictional force of the valve (the frictional force between the gland packing and the valve shaft) decreases. In this case, the speed index becomes large and the frictional force index becomes small. In particular, when the gland packing is a fluorine-based V packing, there is a high possibility that a gap will be formed between the gland packing and the valve shaft. The diagnostic index presenting unit pairs the calculated speed index and the frictional force index and presents them to the operator as a valve diagnostic index.

In the above description, as an example, the components on the drawing corresponding to the components of the invention are indicated by reference numerals in parentheses.

As described above, according to the present invention, the valve speed index is calculated based on the opening measurement value data, and the valve friction force index is calculated based on the opening measurement value data and the pressure measurement value data. The calculated speed index and friction force index are paired and presented to the operator as a valve diagnostic index. Especially when the gland packing is a fluorine-based V packing, the efficiency of valve maintenance work can be improved. You will be able to improve.

FIG. 1 is a block diagram showing a configuration of a main part of a valve maintenance support device according to a first embodiment of the present invention. FIG. 2 is a diagram for explaining the frictional force between the gland packing of the valve and the valve shaft. FIG. 3 is a flowchart showing how the opening measurement value data and the pressure measurement value data are accumulated in the measurement value data storage unit of the valve maintenance support device. FIG. 4 is a diagram illustrating changes in the valve opening degree θ and the air pressure Po in one vertical movement when the valve actuator is a reverse actuator. FIG. 5 is a diagram illustrating changes in the valve opening degree θ and the air pressure Po in one vertical movement when the valve manipulator is a normal operation manipulator. FIG. 6 is a flowchart for explaining the operation of this valve maintenance support device. FIG. 7 is an image diagram showing an example of valve arrangement of the plant to be maintained. FIG. 8 illustrates a change in the maximum operating speed of the valve over time. FIG. 9 is a diagram showing a change in the maximum frictional force of the valve with the passage of time. FIG. 10 is a diagram showing a display example of a diagnostic index (speed index and frictional force index) of a valve that is a maintenance candidate. FIG. 11 is a diagram illustrating a configuration (implementation example of the first embodiment) of the plant and its equipment management system according to the second embodiment of the present invention. FIG. 12 is a diagram showing an example of a control valve.

[Principle of invention]
The inventor has stated that when the gland packing attached to the gland portion of the valve is a fluorine-based V packing, the maximum operating speed of the valve is increased and the maximum frictional force (friction force between the gland packing and the valve shaft (friction force between the gland packing and the valve shaft) It was noted that if (see Fig. 2)) decreased, there may be a gap between the gland packing and the valve shaft. That is, it is a frictional force change phenomenon different from the stick slip, and it is possible that a phenomenon leading to a problem of fluid leakage from the ground portion may occur.

Then, the inventor has come up with the idea that the deterioration of the fluorine-based V-packing can be estimated by presenting the information on the maximum operating speed and the maximum frictional force of the valve to the operator as a diagnostic index. This makes it possible to improve the efficiency of valve maintenance work, especially when the gland packing is a fluorine-based V packing.

Regarding the maximum operating speed, it is necessary to take into consideration the stroke amount that is considered to accelerate the valve shaft sufficiently, such as when the stroke amount of the valve shaft of the valve is equal to or more than the specified value. Suitable. Further, in the present invention, information on the maximum operating speed of the valve is used as a speed index, information on the maximum frictional force of the valve is used as a frictional force index, and these two indexes are presented as a pair as a diagnostic index. In the present invention, it is not essential to strictly extract and present the maximum operating speed and the maximum frictional force.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of a valve maintenance support device according to a first embodiment of the present invention. Here, for the sake of brevity, the example of the valve ID (identification information) will be simpler than that used in an actual plant.

The valve maintenance support device 200 of the present embodiment is realized by hardware including a processor and a storage device and a program that realizes various functions in cooperation with these hardware, and includes a measured value data storage unit 1 and a storage unit 1. It includes a valve ID storage unit 2, a diagnostic index calculation unit 3, a diagnostic index presentation unit 4, a determination unit 5, a threshold storage unit 6, and a determination result presentation unit 7.

In the valve maintenance support device 200, the measured value data storage unit 1 is transmitted from the opening measurement value data D1 and the pressure measuring unit 22 transmitted from the opening measurement unit 21 of the valve 100 used in the plant. The incoming pressure measurement value data D2 is stored.

That is, the valve 100 used in the plant includes an opening degree measuring unit 21 for measuring the opening degree θ of the valve and a pressure measuring unit 22 for measuring the air pressure Po supplied to the actuator of the valve. There is. The opening degree measuring unit 21 transmits the measured valve opening degree θ as the opening degree measurement value data D1 to the valve maintenance support device 200, and the pressure measuring unit 22 uses the measured air pressure Po as the pressure measurement value data D2 to support valve maintenance. It is transmitted to the device 200.

When the valve maintenance support device 200 receives the opening degree measurement value data D1 from the opening degree measuring unit 21 (YES in step S101), as shown in the flowchart in FIG. 3, the valve maintenance support device 200 receives the received opening degree measurement value data D1. When the measured value data storage unit 1 stores the measured value data (step S102) and receives the pressure measured value data D2 from the pressure measuring unit 22 (YES in step S103), the received pressure measured value data D2 is stored in the measured value data storage unit 1. Is stored in (step S104).

FIG. 4 illustrates changes in the valve opening θ (opening measurement value data D1) and air pressure Po (pressure measurement value data D2) in one vertical movement when the valve 100 operator is used as a reverse operation operator. Then, in FIG. 5, when the operator of the valve 100 is a normal operation operator, the valve opening θ (opening measurement value data D1) and the air pressure Po (pressure measurement value data D2) change in one vertical movement. Is illustrated.

In the present embodiment, the opening degree measuring unit 21 and the pressure measuring unit 22 of the valve 100 periodically transmit the opening degree measurement value data D1 and the pressure measurement value data D2 to the measurement value data storage unit 1. It shall be accumulated as time series data. Further, in the present embodiment, a large number of valves 100 are installed in the plant, and the opening measurement value data D1 (D1 _{1 to D1 N} ) and the pressure from these valves 100 (100-1 to 100-N) are installed. It is assumed that the measured value data D2 (D2 _{1 to D2 N} ) is stored in the measured value data storage unit 1 in association with the ID of the valve.

Hereinafter, the operation of the valve maintenance support device 200 will be specifically described with reference to the flowchart shown in FIG. 6, including the functions of each part.

The operator targets the valves 100-1 to 100-N installed in the plant as measurement targets, determines maintenance candidate valves from the measurement target valves 100-1 to 100-N, and selects the maintenance candidate valves. Register the valve (step S201). In this case, the ID of the valve registered as the valve as a candidate for maintenance (hereinafter, also referred to as the valve ID) is stored in the valve ID storage unit 2 of the valve maintenance support device 200.

For example, assuming that there are 26 valves 100 in the plant, these 26 valves 100 have "A", "B", "C", ..., "M", ..., "X", "", respectively. It is assumed that unique IDs "Y" and "Z" are assigned in advance. When valves A, M, and C are defined as maintenance candidate valves, the operator inputs "A", "M", and "C" as valve IDs. In the present embodiment, it is assumed that the valves A, M, and C particularly use the fluorine-based V packing as the gland packing and are selected as the highest priority maintenance target in the specific periodic plant maintenance.

FIG. 7 is an image diagram showing an example of valve arrangement of the plant to be maintained. In the present embodiment, valves 100-A (valve A) and 100-M (valve M) with valve IDs "A" and "M" are arranged in the flow path 11-1 with the flow path ID "1". It is assumed that the valve 100-C (valve C) of the valve ID “C” is arranged in the flow path 11-3 of the flow path ID “3”. In FIG. 7, 12-A, 12-C, and 12-M are flow rate measuring instruments, 13 is a tank, and 14 is a pressure transmitter. In FIG. 7, the description is omitted for valves whose valve IDs are other than "A", "C", and "M".

When the diagnostic index calculation unit 3 receives an instruction to calculate the diagnostic index (YES in step S202), the maintenance candidate valve IDs “A”, “C”, and “M” stored in the valve ID storage unit 2 (Step S203), and the opening measurement value data D1 and the pressure measurement value data D2 stored in the measurement value data storage unit 1 in association with the read valve IDs “A”, “C”, and “M”. Is read (step S204).

Then, the diagnostic index calculation unit 3 obtains information on the maximum operating speed of the valves A, C, and M based on the opening measurement value data D1 read from the measurement value data storage unit 1, and the valve speed index V ( _VA). , V _C, calculated as V _M) (step S205), based on the measurement values opening measurement data D1 and pressure measurement value data D2 read out from the data storage unit 1, the maximum frictional force of the valve a, C, M frictional force of the valve the information about the index _{F (F a, F C,} F M) is calculated as (step S206).

FIG. 8 illustrates a change in the maximum operating speed of the valve over time. FIG. 8 shows both the change in the maximum speed in the positive direction and the change in the maximum operating speed in the negative direction. The diagnostic index calculation unit 3 obtains the current maximum operating speed when the stroke amount of the valve shaft of the valve is equal to or more than the specified value as the detection target of the maximum operating speed, and uses the information on the maximum operating speed as the speed index of the valve. Let it be V.

FIG. 9 shows the change in the maximum frictional force of the valve with the passage of time. The diagnostic index calculation unit 3 has the air pressure Po supplied to the operator required to increase the valve opening and the operation required to decrease the valve opening at the same opening. The pressure difference from the air pressure Po supplied to the vessel is used as the information on the maximum frictional force to obtain the information on the current maximum frictional force, and the information on this maximum frictional force is used as the frictional force index F of the valve.

Calculated by the diagnostic index calculation unit 3 velocity index _{V (V A, V C,} V M) and the friction force indicator _{F (F A, F C,} F M) is sent to the diagnostic index presenting unit 4. The diagnostic index presentation unit 4 pairs the speed index V and the frictional force index F from the diagnostic index calculation unit 3 and presents them to the operator as a diagnostic index for the valve of the maintenance candidate (step S207).

For example, as shown in FIG. 10 as the display area of the diagnostic index as # 1, the IDs “A”, “C”, “” of the maintenance candidate valves are associated with each other, that is, the maintenance candidate valves A, C, and M. in association with the M ", and displays the calculated diagnostic index calculation unit 3 velocity index V _a, V _C, V _M numbers the frictional force indicator F _a, F _C, the value of F _M on the display.

At this time, as shown in the presentation area of the diagnosis target portion as # 2 in FIG. 10, the diagnostic presented to presentation area # 1 of the index (displayed) by the speed and the index V _A, V _C, V _M and the frictional force indicator F _a, F _C, if so F _M presents (displays) that are directed to the maintenance of the V-packing of fluorine-based, the operator knowledge poor of the need for maintenance of the V-packing of the fluorinated Since the necessity of paying attention to the fluorine-based V-packing is quantitatively shown, the risk of omission of the check of the fluorine-based V-packing can be reduced.

Calculated by the diagnostic index calculation unit 3 velocity index _{V (V A, V C,} V M) and the friction force indicator _{F (F A, F C,} F M) is also sent to the determination unit 5. In the threshold storage unit 6, the upper limit of the normal range with respect to the speed index V is set as the diagnostic index threshold (speed index threshold) Vth, and the lower limit of the normal range with respect to the frictional force index F is set as the diagnostic index threshold (friction index threshold) Fth. It is remembered.

When the speed index V and the frictional force index F are sent from the diagnostic index calculation unit 3, the determination unit 5 reads out the diagnostic index thresholds Vth and Fth stored in the threshold storage unit 6 (step S208), and reads out the diagnostic index thresholds Vth and Fth. The speed index V from the calculation unit 3 is compared with the diagnostic index threshold Vth, and the frictional force index F is compared with the diagnostic index threshold Fth (step S209). In this case, the speed indicator V _A from the diagnostic index calculation unit 3, V _C, compared to the respective diagnostic indicator threshold Vth of V _M, the frictional force indicator F _A, F _C, and for each diagnostic index threshold Fth of F _M Compare.

Here, when the speed index V from the diagnostic index calculation unit 3 is equal to or higher than the diagnostic index threshold value Vth and the frictional force index F is equal to or lower than the diagnostic index threshold value Fth (YES in step S209), the determination unit 5 determines the valve. Is determined to be a valve requiring maintenance (step S210). For example, among the speed indicator V _A, V _C, V _M, and the speed indicator V _M is a diagnostic indicator threshold Vth or higher, and the frictional force indicator F _A, F _C, of F _M, the frictional force indicator F _M diagnosis If it is equal to or less than the index threshold value Fth, the valve M is determined to be a valve requiring maintenance. The determination unit 5 sends this determination result to the determination result presentation unit 7.

The determination result presenting unit 7 presents the determination result from the determination unit 5 to the operator (step S211). For example, when the valve M is determined to be a valve requiring maintenance among the valves A, C, and M that are candidates for maintenance, the valve ID and speed of the valve M are shown in the diagnostic index presentation area # 1 shown in FIG. displaying an index V _M and the frictional force indicator F _M in red. In this case, the other valves are displayed in black. At this time, the diagnostic index thresholds Vth and Fth used at the time of determination may be displayed in the diagnostic index presentation area # 1.

In this embodiment, the diagnostic index of the valve that is a candidate for maintenance and the judgment result of whether or not the valve requires maintenance are displayed on the display, but it may be printed out by a printer or the like, and it may be printed out by voice. You may let me know.

Further, in this embodiment, the diagnostic index calculation unit 3 calculates the diagnostic index (speed index V, friction force index F) only for the maintenance candidate valves (valves A, C, M). The diagnostic index may be calculated for all the valves to be measured (valves A to Z). In this case, in the diagnostic index presentation unit 4, the valve IDs of all the valves to be measured are associated with the diagnostic index, for example, the valve that is a candidate for maintenance is blue, and the valve that is not a candidate for maintenance is black. Valves that are judged to require maintenance should be displayed separately, such as in red.

[Embodiment 2]
Next, the valve maintenance support device according to the second embodiment of the present invention will be described. The second embodiment describes an implementation example of the first embodiment. FIG. 11 is a diagram showing the configurations of the plant and its equipment management system, and the same configurations as those in FIG. 7 are designated by the same reference numerals.

Petroleum and chemical plants are provided with an equipment management system 8 that controls and manages each equipment of the plant. The measured value data storage unit 1, the valve ID storage unit 2, the diagnostic index calculation unit 3, the judgment unit 5, and the threshold value storage unit 6 described in the first embodiment handle a huge amount of plant-specific information, and thus are a device management system. It is preferably mounted on the 8 side.

On the other hand, the diagnostic index presenting unit 4 and the determination result presenting unit 7 provide, in principle, particularly necessary processing when determining valve maintenance. In addition, the maintenance operator (the person in charge of the work of the maintenance contractor) is generally outsourced by the plant owner company to carry out the maintenance of the plant. Therefore, assuming that an unspecified number of plants are targeted, the diagnostic index presentation unit 4 and the judgment result presentation unit 7 are mounted on the portable computer 9 carried by the worker (operator) of the maintenance contractor company. It is preferable to do so.

The computer 9 includes a CPU (Central Processing Unit), a memory, and an interface. The equipment management system 8 of the plant and the computer 9 are temporarily connected to each other by using a communication function such as Ethernet (registered trademark) when performing maintenance work.

When the operator starts the application software on the computer 9, the CPU of the computer 9 executes the process according to the program stored in the memory, sends the calculation instruction of the diagnostic index to the device management system 8, and registers it in the device management system 8. For the maintenance candidate valves that have been performed, the diagnostic index is calculated and it is determined whether or not maintenance is necessary. The diagnostic index of the maintenance candidate valve calculated by the device management system 8 and the determination result of whether or not maintenance is necessary are displayed on the display of the computer 9.

In this example, it is assumed that the maintenance candidate valves are already registered in the device management system 8, but the operator can also register or change the maintenance candidate valves from the computer 9.

Based on the diagnostic index of the valve that is a candidate for maintenance displayed on the display of the computer 9 and the judgment result of whether or not maintenance is necessary, the operator should pay particular attention to the inspection of the gland packing (fluorine-based V packing). Confirm. After confirmation, the operator disconnects the computer 9 from the device management system 8.

In this way, the valve maintenance support device 200 described in the first embodiment can be applied to an actual plant.

[Extension of Embodiment]
Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present invention within the scope of the technical idea of the present invention.

1 ... Measured value data storage unit, 2 ... Valve ID storage unit, 3 ... Diagnostic index calculation unit, 4 ... Diagnostic index presentation unit, 5 ... Judgment unit, 6 ... Threshold storage unit, 7 ... Judgment result presentation unit, 21 ... Open Degree measurement unit, 22 ... Pressure measurement unit, 100 (100-1 to 100-N) ... Valve, 101 ... Valve body, 102 ... Positioner, 103 ... Operator, 104 ... Valve shaft, 108 ... Ground part, 109 ... Fluorine System V packing (ground packing), 200 ... Valve maintenance support device.

Claims (7)

A valve maintenance support device that supports valve maintenance work that regulates the flow of fluid.
The opening measurement value data transmitted from the opening measurement unit that measures the opening of the valve and the pressure measurement value data transmitted from the pressure measuring unit that measures the fluid pressure supplied to the valve operator. Measured value data storage unit to be stored and
Based on the opening measurement value data stored in the measured value data storage unit, information on the maximum operating speed of the valve is calculated as a speed index of the valve, and is stored in the measured value data storage unit. A diagnostic index calculation unit that calculates information on the maximum frictional force of the valve as a frictional force index of the valve based on the opening measurement value data and the pressure measurement value data.
A valve maintenance support device including a diagnostic index presenting unit that pairs a speed index calculated by the diagnostic index calculating unit and a frictional force index and presents the valve as a diagnostic index. In the valve maintenance support device according to claim 1,
A threshold storage unit that stores the lower limit value of the normal range with respect to the friction force index as the friction force index threshold value and stores the upper limit value of the normal range with respect to the speed index as the speed index threshold value.
When the frictional force index of the valve calculated by the diagnostic index calculation unit is equal to or less than the frictional force index threshold value, and the speed index of the valve calculated by the diagnostic index calculation unit is equal to or higher than the speed index threshold value. In addition, a judgment unit that determines that the valve is a valve that requires maintenance,
A valve maintenance support device including a determination result presenting unit that presents a valve that is determined to require maintenance by the determination unit. In the valve maintenance support device according to claim 1 or 2.
The diagnostic index calculation unit
At the same opening, the fluid pressure supplied to the operator required to increase the opening of the valve and the fluid pressure required to decrease the opening of the valve are supplied to the operator. A valve maintenance support device for calculating a frictional force index of the valve by using the pressure difference from the fluid pressure to be applied as information on the maximum frictional force of the valve. In the valve maintenance support device according to any one of claims 1 to 3.
The diagnostic index presentation unit
A valve maintenance support device, which, together with the diagnostic index of the valve, indicates that this diagnostic index is attached to the gland portion of the valve and is intended for maintenance of a fluorine-based V packing in contact with the valve shaft. .. In the valve maintenance support device according to any one of claims 1 to 4.
The diagnostic index calculation unit
A valve maintenance support device characterized in that the maximum operating speed is detected when the stroke amount of the valve shaft of the valve is equal to or greater than a specified value. In the valve maintenance support device according to any one of claims 1 to 5.
It is equipped with a valve identification information storage unit that stores the identification information of valves registered as maintenance candidate valves.
The measured value data storage unit is
A plurality of valves including the maintenance candidate valve are targeted for measurement, and the opening measurement value data and the pressure measurement value data are stored in association with the valve identification information for each of the measurement target valves.
The diagnostic index calculation unit
The valve identification information of the maintenance candidate valve stored in the valve identification information storage unit is read out, and the opening measurement value data and the opening measurement value data stored in the measurement value data storage unit are associated with the read identification information. A valve maintenance support device for calculating the speed index and the frictional force index for each of the maintenance candidate valves based on the pressure measurement value data. It is a valve maintenance support method that supports valve maintenance work that regulates the flow of fluid.
The opening measurement value data transmitted from the opening measurement unit that measures the opening of the valve and the pressure measurement value data transmitted from the pressure measuring unit that measures the fluid pressure supplied to the valve operator. Measured value data storage step to be stored in memory and
Based on the opening measurement value data stored in the memory, information on the maximum operating speed of the valve is calculated as a speed index of the valve, and the opening measurement value data stored in the memory and the opening measurement value data are described. A diagnostic index calculation step that calculates information on the maximum frictional force of the valve as a frictional force index of the valve based on the pressure measurement value data, and
A valve maintenance support method comprising a diagnostic index presenting step in which the speed index calculated by the diagnostic index calculation step and the frictional force index are paired and presented as a diagnostic index of the valve.

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