JP2022169930A - Measuring device, measuring method and measuring program - Google Patents

Abstract

To provide a measuring device capable of accurately calculating an SIF Overall Response Time in a plant.SOLUTION: A measuring device 10 comprises: a collection unit 14a that collects an occurrence time when a process of a plant where a field device is installed transited to a dangerous state, and a completion time at which the transition of the process that transited to the dangerous state to a safe state is completed by an actuator of the field device; and a calculation unit 14b that calculates an elapsed time from the dangerous state to the safe state of the process using the occurrence time and the completion time.SELECTED DRAWING: Figure 4

Description

The present invention relates to a measuring device, a measuring method and a measuring program.

In plants that handle petroleum, petrochemicals, chemicals, gas, etc., in order to maintain and improve the safety of the plant process, SIF (Safety Instrumented Function) is installed from the time a certain process becomes dangerous. It is very important to know the time it takes for the system to come into operation and for the process to reach a safe state (where appropriate the "SIF Overall Response Time"). This is because if the measured value of the SIF Overall Response Time is equal to or less than the allowable value, it can be determined that the risk of the plant leading to an accident is low even if a dangerous situation occurs.

JP 2016-191635 A

However, it is difficult to accurately calculate the SIF Overall Response Time in the plant. This is because, with the above technology, if the judgment as to whether or not the transition to the safe state has been completed is made based on the process data such as the flow rate being monitored, various factors such as the weather, the type of the monitored object, etc. This is because the time required to reach a safe state is not constant due to differences in conditions.

In order to solve the above-described problems and achieve the object, a measuring device according to the present invention provides a time when a process of a plant in which a field device is installed changes to a dangerous state, and a time when the process changes to the dangerous state. a completion time when the transition to the safe state of the field device is completed by the actuator of the field device; and a progress of the process from the dangerous state to the safe state using the occurrence time and the completion time. and a calculation unit for calculating time.

Further, in the measuring method according to the present invention, a computer determines the occurrence time when a process of a plant in which a field device is installed transitioned to a dangerous state, and the transition to a safe state of the process that transitioned to the dangerous state. Collecting completion times completed by equipment actuators, and using the occurrence times and the completion times to calculate the elapsed time for the process to reach the safe state from the dangerous state. and

Further, the measurement program according to the present invention stores, in a computer, a time at which a process of a plant in which the field device is installed transitioned to a dangerous state, and a transition to a safe state of the process that transitioned to the dangerous state. Collecting completion times completed by actuators of equipment, and using the occurrence times and the completion times to calculate the elapsed time from the dangerous state to the safe state of the process. and

The present invention can accurately calculate the SIF Overall Response Time in the plant.

1 is a diagram showing a configuration example of a measurement system according to an embodiment; FIG. It is a figure which shows an example of the conventional measurement process. It is a figure which shows an example of record of the process data and time in the conventional measurement process. It is a block diagram showing an example of composition of a measuring device concerning an embodiment, and a safety instrumentation device. 4 is a time chart showing an example of the overall flow of measurement processing according to the embodiment; 5 is a time chart showing an example of a display result by process information control processing according to the embodiment; 5 is a time chart showing an example of a display result by process information control processing according to the embodiment; 6 is a flowchart showing an example of the overall flow of measurement processing according to the embodiment; 6 is a flow chart showing an example of the flow of process control processing according to the embodiment; 6 is a flowchart showing an example of the flow of process information control processing according to the embodiment; It is a figure explaining an example of a hardware configuration.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Modes (optionally, embodiments) for carrying out the invention of a measuring apparatus, a measuring method, and a measuring program according to the present invention will be described in detail below with reference to the drawings. In addition, this invention is not limited by embodiment described below.

[Embodiment]
The configuration of the measurement system according to this embodiment, the configuration of the measurement device, etc., the relationship between each process and time, a specific example of display processing, and the flow of each process will be described below in order, and finally the effects of this embodiment will be described. explain. Note that the types of monitoring targets, process data, field devices, etc. in the plant are merely examples, and are not limited to those shown in the figure.

The plant process used in this embodiment is, for example, a series of plant processes. A field device is a device such as a sensor or an actuator involved in plant process control. For example, a flow meter, a temperature sensor, a pressure gauge, etc. can be used as sensors, and a fluid shutoff valve, sprinkler, gas shutoff valve, etc. can be used as actuators, but the scope of application is not limited. The process data is data indicated by the monitoring target of the plant process, such as flow rate data, temperature data, pressure data, etc., but can be various data generated in the process.

[Configuration of measurement system]
The configuration of a measurement system (or the present system as appropriate) 100 according to the present embodiment will be described in detail with reference to FIG. FIG. 1 is a diagram showing a configuration example of a measurement system according to an embodiment. An example of the configuration of the entire system 100 will be shown below, and then process control processing and process information control processing will be described in this order.

(Example of overall system configuration)
This system 100 is a system used for plant control. For example, the present system 100 includes a measuring device 10, a flow meter 20 that is a sensor of field equipment installed in the plant (arbitrarily a "field sensor"), and a shutoff valve 30 that is an actuator of the field equipment installed in the plant. , and a safety instrumented device 40 which is a safety instrumented system (SIS). Here, the measuring device 10, the flowmeter 20, the shutoff valve 30, and the safety instrumentation device 40 are connected to each other via a predetermined communication network (not shown) so as to be able to communicate with each other by wire or wirelessly. Note that the measuring device 10 and the safety instrumented device 40 may be connected via an OPC (Open Platform Communications) interface, which is a standard specification for exchanging process data, for example. The measurement system 100 shown in FIG. 1 may also include a plurality of measuring devices 10, a plurality of flowmeters 20, a plurality of shutoff valves 30, and a plurality of safety instrumentation devices 40. FIG.

(Process Control Layer)
First, the flowmeter 20 measures the flow rate of fluid flowing through the pipe (step S1). Here, the fluid whose flow rate is measured by the flowmeter 20 is service water, fluid chemicals, waste water, petroleum, waste oil, etc., but is not particularly limited.

Next, the safety instrumentation device 40 acquires flow rate data measured by the flow meter 20 (step S2). At this time, the safety instrumentation device 40 constantly acquires the flow rate data measured by the flow meter 20 and monitors the flow rate data, thereby monitoring the process of the plant. When the flow rate data measured by the flow meter 20 reaches a set value (appropriately, "flow rate HHH") and the process is judged to be in a dangerous state, the safety instrumentation device 40 closes the shutoff valve 30. A command is transmitted (step S3).

Subsequently, the cutoff valve 30 performs a fully closed process according to the closing operation command (step S4), and transmits a closing signal when the closing operation is completed. The safety instrumentation device 40 then receives the closing signal transmitted from the cutoff valve 30 (step S5).

(Process information control processing: Process Information Layer)
First, the measuring device 10 collects the occurrence time of the dangerous state and the reception time of the closing signal recorded by the safety instrumentation device 40 (step S6). At this time, the measuring device 10 collects the time of occurrence and the time of reception via an OPC server installed in the plant, but the collecting method is not particularly limited.

Next, the measurement device 10 uses the collected time of occurrence of the dangerous state and the time of reception of the closing signal to determine the time required for the process to reach a safe state from the time when a certain process became dangerous, that is, Calculate the SIF Overall Response Time (step S7). The measuring device 10 then displays the calculated SIF Overall Response Time (step S8). An example of display by the measuring device 10 will be described later in [Specific Example of Display Processing].

By performing the processing of steps S1 to S8 described above, it is possible to more accurately, rationally, and logically calculate "the time from when the process becomes dangerous to when it reaches a safe state = SIF Overall Response Time." becomes possible.

[Conventional measurement process]
Here, a conventional measurement process that is generally performed will be described as a reference technique with reference to FIGS. 2 and 3. FIG. FIG. 2 is a diagram showing an example of conventional measurement processing. FIG. 3 is a diagram showing an example of record of process data and time in conventional measurement processing. A specific example of the conventional measurement process and the calculation of the conventional SIF Overall Response Time will be described below in this order.

(Concrete example of conventional measurement processing)
A specific example of conventional measurement processing will be described with reference to FIG. First, the flowmeter 20 measures the flow rate of the fluid flowing through the pipe (step S11). Next, the control device 50, which is a distributed control system (DCS) that manages the process, acquires flow rate data measured by the flow meter 20 (step S12). At this time, the controller 50 records the flow rate data measured by the flow meter 20 along with the time.

Also, the safety instrumentation device 40 acquires the flow rate data measured by the flow meter 20 (step S13). At this time, the safety instrumentation device 40 constantly acquires the flow rate data measured by the flow meter 20 and monitors the flow rate data, thereby monitoring the process of the plant. When the flow rate data measured by the flow meter 20 reaches the set value and the process is determined to be in a dangerous state, the safety instrumentation device 40 transmits a closing operation command to the shutoff valve 30 (step S14). . Subsequently, the shutoff valve 30 performs a fully closing process according to the closing operation command (step S15).

(Conventional calculation of SIF Overall Response Time)
Calculation of the conventional SIF Overall Response Time will be described with reference to FIG. In the conventional measurement process described above, the control device 50 or the safety instrumentation device 40 records the flow rate data measured by the flow meter 20 along with the time. Here, the time point when the flow rate in the pipe exceeds the set value (flow rate HHH) is defined as "dangerous state" (Fig. : Time B-1). Therefore, the difference between the time A-1 and the time B-1 recorded in the control device 50 or the safety instrumentation device 40 is "the time from when the process became in a dangerous state to when it reached a safe state=SIF Overall Response Time". calculated as

Thus, conventional estimation or calculation of the SIF Overall Response Time is done manually based on sporadic recorded data in various systems. Therefore, it is difficult to efficiently grasp the SIF Overall Response Time. In addition, when the control device 50 records the flow rate data along with the time, the minimum unit of the recorded time becomes the time unit of the control device 50, and the time resolution (millisecond unit) does not become more than that. It is difficult to know exactly when the transition to the state was completed. Furthermore, if the judgment of whether the transition to the safe state is completed or not is based on the monitored flow rate data, it may take time to reach the safe state due to differences in weather, fluid type, etc. It's difficult to know exactly.

On the other hand, as described above, the measuring device 10 shown in FIG. After that, collect the reception time of the closing signal output when the shutoff valve 30 installed in the piping in the dangerous state is fully closed, and use the time of occurrence of the dangerous state and the reception time of the closing signal to determine whether the piping is in danger. Calculate the elapsed time from the state to the safe state and display the calculated elapsed time.

That is, in the process control layer, the measurement device 10 is transmitted with "flow rate HHH generation and its time" and "shutoff valve closing signal and its time", detects the flow rate HHH, and then operates the shutoff valve. A "SIF Overall Response Time" can be generated based on the time it took for the to complete. Therefore, the measuring device 10 shown in FIG. 1 can accurately calculate the SIF Overall Response Time in the plant. Also, the measuring device 10 shown in FIG. 1 can calculate the SIF Overall Response Time in the plant in units of milliseconds.

[Configuration of measuring device, etc.]
The configuration of the measuring device 10 and the like according to this embodiment will be described in detail with reference to FIG. FIG. 4 is a block diagram showing a configuration example of a measuring device and a safety instrumented device according to the embodiment. Below, the configuration of the measuring device 10 and the configuration of the safety instrumented device 40 will be described in this order.

(Configuration of measuring device 10)
The measuring device 10 has an input/output unit 11 , a communication unit 12 , a storage unit 13 and a control unit 14 . The input/output unit 11 controls input of various information to the measuring device 10 . The input/output unit 11 is realized by, for example, a mouse, a keyboard, or the like, and receives input such as setting information to the measuring device 10 . Also, the input/output unit 11 controls output of various information from the measuring device 10 . The input/output unit 12 is implemented by, for example, a display, and outputs setting information and the like stored in the measuring device 10 .

The communication unit 12 manages data communication with other devices. For example, the communication unit 12 performs data communication with each communication device. The communication unit 12 can also perform data communication with an operator's terminal (not shown).

The storage unit 13 stores various information referred to when the control unit 14 operates and various information acquired when the control unit 14 operates. Here, the storage unit 13 can be realized by, for example, a semiconductor memory device such as a RAM (Random Access Memory) or flash memory, or a storage device such as a hard disk or an optical disk. Note that although the storage unit 13 is installed inside the measuring device 10 in the example of FIG. 4, it may be installed outside the measuring device 10, and a plurality of storage units may be installed.

The control unit 14 controls the entire measurement apparatus 10 . The control unit 14 has a collection unit 14a, a calculation unit 14b, and a display unit 14c. Here, the control unit 14 is realized by, for example, an electronic circuit such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) or an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). obtain.

The collection unit 14a collects the occurrence time when the process of the plant where the field device is installed transitioned to the dangerous state, and the completion time when the transition of the process that transitioned to the dangerous state to the safe state was completed by the actuator of the field device. . For example, the collection unit 14a collects occurrence times from sensors of field devices that measure process data in the plant, and collects completion times from the field devices. The collection unit 14a also collects the occurrence time and completion time from the safety instrumented device 40 .

In the above example, the safety instrumentation device 40 detects the occurrence of a dangerous state in the piping when the flow rate data flowing through the piping in the flow meter 20 installed in the piping in the plant exceeds a set value. Then, the collection unit 14 collects the time when the safety instrumented device 40 detects the occurrence of the dangerous state as the occurrence time.

Furthermore, the safety instrumentation device 40 detects the transition from the dangerous state to the safe state of the piping when the shutoff valve 30 installed downstream of the flow meter 20 is fully closed after the detection of the dangerous state. Then, the collection unit 14 collects the time when the safety instrumented device 40 detects the transition to the safe state as the completion time.

As an example, the collection unit 14a collects, as the occurrence time, the time when the flow rate data becomes equal to or greater than the flow rate HHH. In addition, the collection unit 14a collects the reception time of the close signal output when the cutoff valve 30 installed in the pipe in the dangerous state is fully closed after the occurrence of the dangerous state as the completion time.

Here, the collection unit 14a may collect the occurrence time and completion time in a data format conforming to the OPC standard used between the measuring device 10 and the safety instrumented device 40 . The collection unit 14 a may store the collected occurrence time and completion time in the storage unit 13 .

The calculation unit 14b calculates the elapsed time from the dangerous state to the safe state by using the occurrence time of the dangerous state and the completion time of the transition to the safe state. In the above example, the calculation unit 14b calculates the elapsed time from the time of occurrence to the time of completion as the SIF Overall Response Time, which is the time required for the flow rate in the pipe to reach a safe state. Note that the calculation unit 14 b may store the calculated elapsed time in the storage unit 13 .

The display unit 14c generates a time chart that displays the occurrence time of the dangerous state and the completion time of the transition to the safe state on the same time series, and displays the elapsed time between the occurrence time and the completion time. Generate and output the display screen displayed on the chart. A detailed description of the processing of the display unit 14c will be given later in [Specific example of display processing].

(Configuration of safety instrumented device 40)
The safety instrumented device 40 is an example of a device that monitors field sensors within a plant. This safety instrumentation device 40 has, as a control unit 41, an acquisition unit 41a, a determination unit 41b, and a transmission unit 41c.

The acquisition unit 41a acquires values of field sensors in the plant. In the above example, the acquiring unit 41a acquires the flow rate data of the flow meter 20 installed in the piping in the plant. The obtaining unit 41a also obtains a signal output when the actuator stops. Furthermore, the obtaining unit 41a measures the time when the actuator stops due to the transition of the process to the safe state as the completion time. In the above example, the acquisition unit 41a acquires the close signal that is output when the cutoff valve 30 is fully closed. In addition, the acquiring unit 41a measures the reception time at which the closing signal of the cutoff valve 30 is acquired as the completion time.

Further, the determination unit 41b detects a dangerous state when the value of the process data of the field sensor is equal to or greater than the set value, and measures the time when the dangerous state is detected as the occurrence time. In the above example, the determination unit 41b detects a dangerous state when the value of the flow meter 20 is equal to or higher than the flow rate HHH, and measures the time when the dangerous state is detected as the occurrence time. In addition, the determination unit 41b records the occurrence of the dangerous state and the occurrence time. Further, the determination unit 41b records the reception time of the close signal as the completion time when the transition to the safe state is completed.

The transmitter 41c detects a dangerous state and transmits an instruction to the actuator of the field device to stop the operation of the process. In the above example, the transmission unit 41c transmits a close operation command to the cutoff valve 30 .

[Relationship between each process and time]
The relationship between the time of each process and the SIF Overall Response Time according to this embodiment will be described in detail with reference to FIG. FIG. 5 is a time chart showing an example of the overall flow of measurement processing according to the embodiment. The SIF Overall Response Time will be described below after describing the time of each process.

(time of each process)
FIG. 5(1) is the time when the flow meter 20 installed in the piping in the plant detects an abnormality in the flow rate data (flow rate>HHH).

FIG. 5(2) is the time when the AI (Analog Input) module of the safety instrumentation device 40 detects an abnormality in the flow rate data (flow rate>HHH).

FIG. 5(3) is the time at which the CPU of the safety instrumentation device 40 detects an abnormality in the flow rate data (flow rate>HHH). The safety instrumented device 40 records the time (3) as the dangerous state start time A-2.

FIG. 5(4) is the time when the control logic that puts the process of the safety instrumented device 40 into a safe state starts operating.

FIG. 5( 5 ) is the time at which the DO (Digital Output) module of the safety instrumented device 40 transmits the closing operation command to the cutoff valve 30 .

FIG. 5(6) is the time when the shutoff command reaches the cutoff valve 30 and the shutoff valve 30 receives the close command.

FIG. 5(7) shows the time at which the cut-off valve 30, having received the closing operation command, starts the fully closed operation.

FIG. 5(8) shows the time at which the cutoff valve 30, having received the closing operation command, finishes the fully closed operation.

FIG. 5( 9 ) is the time at which the shutoff valve 30 that has completed the fully closed operation transmits a close signal to the safety instrumented device 40 .

5 ( 10 ) is the time when the DI (Digital Input) module of the safety instrumented device 40 receives the close operation command from the cutoff valve 30 . The safety instrumentation device 40 records the time (10) as the time B-2 when the safety state is reached.

(SIF Overall Response Time)
At times (1) to (10) described above, the elapsed time from time (1) to time (8) is the actual SIF Overall Response Time. On the other hand, the elapsed time from time (3) to time (10) is the SIF Overall Response Time on the system. At this time, the time from time (1) to time (3) is extremely short. Similarly, the time from time (8) to time (10) is extremely short. Therefore, the SIF Overall Response Time on the system can be considered as the actual SIF Overall Response Time.

[Specific example of display processing]
A specific example of the display processing according to the present embodiment will be described in detail with reference to FIGS. 6 and 7. FIG. 6 and 7 are time charts showing examples of display results of the process information control process according to the embodiment. The display unit 14c of the measurement device 10 can display the calculated SIF Overall Response Time not only as a numerical value, but also using a diagram such as a time chart. In addition, it is possible to display the allowed SIF Overall Response Time, a time chart on which the measured process data are superimposed, and the like.

(Time chart 1)
A time chart 1, which is a specific example of display processing, will be described with reference to FIG. The display unit 14c displays the dangerous state occurrence time (actually measured value), the SIF Overall Response Time (permissible value) permitted by the plant manager, the safe state transition time (actually measured value), and the SIF Overall Response Time actually calculated by the calculation unit 14b. Response Time (measured value) is obtained from the calculator 14b. Next, the display unit 14c generates a time chart on which the above data are superimposed. Then, the display unit 14 c displays the web screen including the generated time chart via the input/output unit 11 of the measuring device 10 . In addition, the display unit 14 c may display a display screen including the generated time chart on the terminal of the plant manager via the communication unit 12 of the measuring device 10 .

Furthermore, the display unit 14c can switch flow rate data, pressure data, temperature data, etc. as the process data to be displayed based on the operation of the pull-down menu. The display unit 14c can also display the comparison result by comparing the actual measurement value and allowable value of the SIF Overall Response Time as the status. The status displayed by display 14c in FIG. 6 indicates that the measured SIF Overall Response Time exceeds the acceptable value, indicating that improvements are needed in plant safety management.

(Time chart 2)
A time chart 2, which is a specific example of display processing, will be described with reference to FIG. Description of the processing common to the time chart 1 in FIG. 6 is omitted. The display unit 14c generates a time chart in which allowable values, measured values, etc. are superimposed and displayed as a web screen in the same manner as the time chart 1 . The status displayed by the display unit 14c in FIG. 7 indicates that the measured value of the SIF Overall Response Time is below the permissible value and is within the permissible range for plant safety management.

(Other display processing)
The display unit 14c of the measuring device 10 displays a time chart by superimposing the actually calculated SIF Overall Response Time (actual value) on the diagram showing the relationship between the process data (flow rate) and time shown in FIG. (not shown). In addition, the display unit 14c may display a plurality of SIF Overall Response Times (measured values), or may display the time and time related to the SIF Overall Response Time in a tabular format. The display format of Response Time is not particularly limited. Furthermore, the display unit 14c can call attention by changing the display color or the like when the measured value of the SIF Overall Response Time exceeds the allowable value.

[Overall measurement process flow]
The overall flow of measurement processing according to this embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing an example of the overall flow of measurement processing according to the embodiment. In the measurement process according to this embodiment, the process control process (step S101) and the process information control process (step S102) are repeatedly executed. Here, the processes of steps S101 and S102 are performed periodically and asynchronously. That is, the processes of steps S101 and S102 may be performed individually or in different orders. If the measurement process is to be executed in real time, step S102 may be executed immediately after step S101. Step S102 may be performed after several days.

(process control processing)
The safety instrumented device 40 executes process control processing (step S101). In the process control process, the safety instrumented device 40 acquires the flow rate data measured by the flow meter 20, and when the process is determined to be in a dangerous state based on the set value of the safety instrumented device 40, the shutoff valve 30 A closing operation command is transmitted to the shutoff valve 30, and a close signal is received when the closing operation of the cutoff valve 30 is completed. A detailed description of the process control processing will be given later in [Flow of Process Control Processing].

(process information control processing)
The measuring device 10 executes process information control processing (step S102). In the process information control process, the measuring device 10 collects the occurrence time of the dangerous state and the reception time of the closing signal recorded by the safety instrumentation device 40, is used to calculate the SIF Overall Response Time, the time required for the process to reach a safe state from the time a process entered a dangerous state, and display the calculated SIF Overall Response Time. A detailed description of the process information control process will be given later in [Flow of process information control process].

[Flow of process control processing]
The flow of process control processing according to this embodiment will be described in detail with reference to FIG. FIG. 9 is a flowchart illustrating an example of the flow of process control processing according to the embodiment.

First, the acquisition unit 41a of the safety instrumentation device 40 acquires flow data measured by the flow meter 20 (step S201). Next, the determination unit 41b determines the state of the flow rate from the constantly measured, ie monitored, flow rate data (step S202). At this time, the determining unit 41b may determine the state of the flow rate using a stepped numerical value representing the safe state or the dangerous state, in addition to the state such as "safe state" or "dangerous state".

If the flow rate is equal to or greater than the set value (flow rate HHH) of the safety instrumented device 40 (step S203: Yes), the determination unit 41b determines that a dangerous state has occurred in the process, and is recorded and the time of occurrence is recorded (step S204). On the other hand, if the flow rate is less than the set value (flow rate HHH) of the safety instrumented device 40 (step S203: No), the determination unit 41b determines that the process is in a safe state and returns to step S201.

Subsequently, the transmitting unit 41c transmits an operation command to fully close the shutoff valve 30 to the shutoff valve 30 (step S205). Finally, the acquiring unit 41a receives the close signal transmitted from the shutoff valve 30 when the shutoff valve 30 is fully closed (step S206), and obtains the close signal of the shutoff valve 30 and the reception time of the close signal. It records (step S207) and ends the process.

In the processing of steps S204 and S207, the determination unit 41b may store the occurrence time, the reception time, etc. in the storage area of the safety instrumented device 40, or store them in the storage unit of another device. may

[Process information control process flow]
The flow of process information control processing according to this embodiment will be described in detail with reference to FIG. FIG. 10 is a flowchart illustrating an example of the flow of process information control processing according to the embodiment.

First, the collection unit 10a of the measuring device 10 receives the occurrence of a dangerous state due to reaching the flow rate HHH and the time of occurrence (step S301). The collection unit 10a also receives the close signal of the cutoff valve 30 and the reception time thereof (step S302). At this time, the collection unit 10a may collect the time of occurrence, the time of reception, etc. via the communication unit 12, or may collect the information stored in the storage unit 13 of the measuring device 10 or the storage unit of another device. Occurrence time, reception time, etc. may be acquired. Note that the process of step S301 and the process of step S302 may be performed at the same time, or the process of step S302 may be performed before the process of step S301.

Next, the calculation unit 10b calculates the SIF Overall Response Time on the system from the difference between the occurrence time and the reception time collected in the processes of steps S301 and S302 (step S303). Further, the calculation unit 10b processes the calculation data calculated in the process of step S303 (step S304). At this time, the calculation unit 10b can adopt a specific calculation result, delete an unnecessary calculation result, or correct the calculation result. Note that the calculation unit 10b can also omit the process of step S304.

Finally, the display unit 10c displays a time chart of the SIF Overall Response Time based on the calculation results calculated and processed by the calculation unit 10b (step S305), and ends the process. It should be noted that the display processing in step S305 is not particularly limited as described above in [Specific example of display processing].

[Effects of Embodiment]
First, in the measurement process according to the present embodiment described above, the time at which the process of the plant in which the field device is installed transitioned to the dangerous state, and the transition to the safe state of the process that transitioned to the dangerous state were determined by the field device. The completion times completed by the actuators 30 are collected, and the occurrence and completion times are used to calculate the elapsed time for the process to go from a dangerous state to a safe state. Therefore, in this process, the SIF Overall Response Time in the plant can be calculated accurately.

Second, in the measurement process according to the present embodiment described above, a time chart is generated that displays the occurrence time of the dangerous state and the completion time of the transition to the safe state on the same time series. A display screen displaying on a time chart that the interval is the elapsed time from the dangerous state to the safe state is generated and output. Therefore, in this process, plant safety can be effectively maintained by accurately calculating and displaying the SIF Overall Response Time in the plant.

Third, in the measurement process according to the present embodiment described above, the time when process data exceeding a set value is detected by the sensor of the field device is collected as the occurrence time, and the completion time is collected from the field device. Therefore, in this process, the SIF Overall Response Time in the plant can be accurately calculated by measuring the time when the transition to the safe state of the process is completed in real time.

Fourth, in the measurement process according to the present embodiment described above, the safety instrumented device 40 that monitors the field sensor 20 in the plant detects a dangerous state when the process data of the field sensor 20 is equal to or greater than the set value. The time at which the dangerous state is detected is measured as the occurrence time, and after the dangerous state is detected and an instruction to stop the operation of the field device is transmitted to the actuator 30 of the field device, the state transitions to the safe state. Accordingly, the occurrence time and the completion time are collected from the safety instrumented device 40 that measures the time when the actuator 30 stops as the completion time. Therefore, in this process, the SIF Overall Response Time in the plant can be accurately calculated by acquiring more detailed time without changing the existing system.

Fifth, in the measurement process according to the present embodiment described above, the time specified by the flow meter 20 installed in the pipe in the plant detecting that the flow rate data flowing through the pipe exceeds the set value is detected. After the occurrence time, the time when the shutoff valve 30 installed downstream of the pipe from the flow meter 20 is fully closed is collected as the completion time of the transition to the safe state, and from the completion time Calculate the elapsed time to occurrence time as the SIF Overall Response Time, which is the time for the process to reach a safe state. Therefore, in this process, it is possible to accurately calculate the SIF Overall Response Time in a plant that handles fluid.

[Modification of Embodiment]
In the present embodiment, the fluid to be monitored, the flowmeter 20 as the field sensor, and the shutoff valve 30 as the actuator of the field device have been described, but there is no particular limitation as long as it relates to the safety of the plant. An example in which temperature and gas are used as objects to be monitored will be described below.

(Modification 1)
An example using temperature as a monitoring target will be described below (not shown). In this modification, a temperature sensor 20-1 is used as the field sensor 20, and a sprinkler 30-1 or the like is used as the actuator 30 of the field device. First, the temperature sensor 20-1 measures the temperature of the processes in the plant and transmits the temperature data to the safety instrumentation device 40. FIG. Then, the safety instrumented device 40 transmits an opening operation command to the sprinkler 30-1 when the temperature data reaches the set value and it is determined that the situation is dangerous. Subsequently, the sprinkler 30-1 performs full opening processing according to the opening operation command, and transmits an open signal when the opening operation is completed. The safety instrumentation device 40 then receives the open signal transmitted from the sprinkler 30-1. On the other hand, the measuring device 10 collects the time of occurrence of the dangerous state and the time of reception of the open signal recorded by the safety instrumented device 40, and uses the collected time of occurrence of the dangerous state and the time of reception of the open signal to calculate the SIF Calculate the Overall Response Time and display the calculated SIF Overall Response Time.

(Modification 2)
An example in which gas is used as a monitoring target will be described below (not shown). In this modification, a pressure gauge 20-2 is used as the field sensor 20, and a gas cutoff valve 30-2 or the like is used as the actuator 30 of the field device. First, the pressure gauge 20-2 measures the pressure of the gas in the gas pipe in the plant and transmits the pressure data to the safety instrumentation device 40. Then, the safety instrumentation device 40 sends a closing operation command to the gas cutoff valve 30-2 when the pressure data reaches the set value and it is determined that the situation is dangerous. Subsequently, the gas cutoff valve 30-2 performs fully closing processing according to the closing operation command, and transmits a close signal when the closing operation is completed. The safety instrumentation device 40 then receives the close signal transmitted from the gas cutoff valve 30-2. On the other hand, the measuring device 10 collects the time of occurrence of the dangerous state and the time of reception of the closing signal recorded by the safety instrumented device 40, and uses the collected time of occurrence of the dangerous state and the time of reception of the closing signal to calculate the SIF Calculate the Overall Response Time and display the calculated SIF Overall Response Time.

〔system〕
Information including processing procedures, control procedures, specific names, and various data and parameters shown in the above documents and drawings can be arbitrarily changed unless otherwise specified.

Also, each component of each device illustrated is functionally conceptual, and does not necessarily need to be physically configured as illustrated. That is, the specific forms of distribution and integration of each device are not limited to those shown in the drawings. That is, all or part of them can be functionally or physically distributed and integrated in arbitrary units according to various loads and usage conditions.

Further, each processing function performed by each device may be implemented in whole or in part by a CPU and a program analyzed and executed by the CPU, or implemented as hardware based on wired logic.

〔hardware〕
Next, a hardware configuration example of the measuring device 10 will be described. Note that the safety instrumented device 40 and other devices can also have the same hardware configuration. FIG. 11 is a diagram illustrating a hardware configuration example. As shown in FIG. 11, the measuring device 10 has a communication device 10a, a HDD (Hard Disk Drive) 10b, a memory 10c, and a processor 10d. 11 are interconnected by a bus or the like.

The communication device 10a is a network interface card or the like, and communicates with other servers. The HDD 10b stores programs and DBs for operating the functions shown in FIG.

The processor 10d reads from the HDD 10b or the like a program for executing the same processing as each processing unit shown in FIG. 4 and develops it in the memory 10c, thereby operating processes for executing each function described with reference to FIG. 4 and the like. For example, this process performs the same function as each processing unit of the measurement device 10 . Specifically, the processor 10d reads from the HDD 10b or the like a program having functions similar to those of the collection unit 14a, the calculation unit 14b, the display unit 14c, and the like. Then, the processor 10d executes a process that executes the same processing as the collection unit 14a, the calculation unit 14b, the display unit 14c, and the like.

Thus, the measuring device 10 operates as an information processing device that executes various processing methods by reading and executing programs. Further, the measuring device 10 can read the program from the recording medium by the medium reading device, and execute the read program to realize the same function as the embodiment described above. In addition, the program referred to in this other embodiment is not limited to being executed by the measurement device 10 . For example, the present invention can be applied in the same way when another computer or server executes the program, or when they cooperate to execute the program.

This program can be distributed via a network such as the Internet. Also, this program is recorded on a computer-readable recording medium such as a hard disk, flexible disk (FD), CD-ROM, MO (Magneto-Optical disk), DVD (Digital Versatile Disc), etc., and is read from the recording medium by a computer. It can be executed by being read.

REFERENCE SIGNS LIST 10 measurement device 11 input/output unit 12 communication unit 13 storage unit 14, 41 control unit 14a collection unit 14b calculation unit 14c display unit 20 flow meter (field sensor)
30 shut-off valve (actuator)
40 safety instrumentation device 41a acquisition unit 41b determination unit 41c transmission unit 50 control device 100 measurement system

Claims (7)

A collection unit that collects the occurrence time when a process of a plant in which a field device is installed transitioned to a dangerous state, and the completion time when the transition of the process that transitioned to the dangerous state to the safe state was completed by the actuator of the field device. When,
a calculation unit that calculates the elapsed time for the process to reach the safe state from the dangerous state using the occurrence time and the completion time;
A measuring device comprising: generating a time chart displaying the occurrence time and the completion time on the same time series, and displaying on the time chart that the elapsed time is between the occurrence time and the completion time; display unit for generating and outputting;
2. The measurement device of claim 1, further comprising: a. The collection unit is
collecting the time at which the sensor of the field device detects process data exceeding a set value as the occurrence time, and collecting the completion time from the field device;
3. The measuring device according to claim 1 or 2, characterized in that: The plant has a safety instrumented device that monitors the sensor,
The safety instrumented device is
detecting the dangerous state when the process data is equal to or greater than the set value, and measuring the time when the dangerous state is detected as the occurrence time;
After the dangerous state is detected and an instruction to stop the operation of the field device is transmitted to the actuator, the time when the actuator stops due to the transition to the safe state is measured as the completion time,
The collection unit is
collecting the occurrence time and the completion time from the safety instrumented device;
4. The measuring device according to claim 3, characterized in that: The collection unit is
The time specified by the flow meter installed in the pipe in the plant detecting that the flow rate data flowing through the pipe exceeds a set value is collected as the occurrence time,
After the occurrence time, the time when the shutoff valve installed downstream of the pipe from the flow meter is fully closed is collected as the completion time,
The calculation unit
calculating the elapsed time from the completion time to the occurrence time as the SIF Overall Response Time, which is the time for the field device to reach a safe state;
The measuring device according to any one of claims 1 to 4, characterized in that: the computer
Collecting the occurrence time when the process of the plant where the field device is installed transitioned to a dangerous state and the completion time when the transition to the safe state of the process that transitioned to the dangerous state was completed by the actuator of the field device,
calculating the elapsed time for the process to reach the safe state from the dangerous state using the time of occurrence and the time of completion;
A measurement method characterized by performing a process. to the computer,
Collecting the occurrence time when the process of the plant where the field device is installed transitioned to a dangerous state and the completion time when the transition to the safe state of the process that transitioned to the dangerous state was completed by the actuator of the field device,
calculating the elapsed time for the process to reach the safe state from the dangerous state using the time of occurrence and the time of completion;
A measurement program characterized by causing a process to be executed.

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