CN111915268A - Standardized management method based on chemical industry DCS alarm change - Google Patents
Standardized management method based on chemical industry DCS alarm change Download PDFInfo
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Abstract
The embodiment of the invention discloses a standardized management method based on DCS alarm change in the chemical industry, which comprises the following steps: step 1: inputting DCS alarm change reasons and purposes; step 2: selecting a change type; and step 3: inputting the change content; and 4, step 4: importing a document; and 5: if the type of 'deleting the existing alarm' is selected in the step 2, prompting the applicant whether the risk level is still in an 'acceptable' range; step 6: if the step 2 selects 'adding new alarm', prompting the applicant to confirm the details of the content in the step 3; and 7: if the type of 'modifying the existing alarm' is selected in the step 2, prompting the applicant to change the existing alarm content; and 8: the update revision list is confirmed. The invention can standardize a large amount of DCS alarm change activities which do not contain change management in the existing chemical production enterprises, obviously improves the pertinence and the applicability of the activities containing change management on scheme feasibility audit and risk identification evaluation, and simultaneously improves the efficiency of DCS alarm change.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a standardized management method based on DCS alarm change in the chemical industry.
Background
With the gradual improvement of automation integration, process parameter deviation alarm as an important protection measure is more and more widely applied to safe and stable production activities in the chemical industry. After the production device is put into operation, the related alarm settings need to be changed due to design defects, equipment problems, regulatory requirements, expanded production and energy conservation, and the like.
The change management process of the chemical industry is mainly designed aiming at the improvement of process technology and the modification of equipment hardware. The applicability of the configuration parameter change in a DCS (Distributed Control System) Control System to Control logic, alarm management, and the like is not strong in the aspects of risk identification Control, scheme feasibility, and the like. At present, the knowledge and experience system and the related process management system of the existing instrument control professionals of the chemical industry production enterprises are not completely matched with the automation improvement speed of the production devices of the industry of nearly ten years, so that the phenomenon that alarm type change can be executed without changing the approval process exists in the industry, or the research quality of core change risk identification evaluation and feasibility of a change scheme is completely determined by the personal experience and capability of a change scheme initiator although the change management process is adopted.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a standardized management method based on DCS alarm change in the chemical industry, so as to standardize a large number of DCS alarm change activities that do not include change management in the existing chemical production enterprises, significantly improve the pertinence and applicability of the activities that include change management in scheme feasibility audit and risk identification evaluation, and improve the efficiency of DCS alarm change.
In order to solve the technical problem, an embodiment of the present invention provides a standardized management method based on DCS alarm change in the chemical industry, including:
step 1: inputting the reason of DCS alarm change and the purpose of changing expectation achievement;
step 2: selecting the type of DCS alarm change, wherein the type of DCS alarm change is divided into three types of 'deleting the existing alarm', 'adding a new alarm' and 'modifying the existing alarm';
and step 3: inputting and changing specific content;
and 4, step 4: importing a document for reference of a change management auditor, wherein the document comprises a data table of an instrument measuring element transmitter of which the DCS alarm setting is to be changed, specific setting information of the instrument transmitter in a DCS system at present and an alarm information ledger;
and 5: if the type of 'deleting the existing alarm' is selected in the step 2, prompting an applicant to provide related process risk analysis content to confirm whether the risk level of the related risk point after the alarm as the protective layer is deleted is still in a preset 'acceptable' range;
step 6: if the type of 'adding new alarm' is selected in the step 2, the applicant is prompted to confirm again and refine the specific detail information of the changed content input in the step 3;
and 7: if the type of 'modifying the existing alarm' is selected in the step 2, prompting an applicant to confirm the DCS position number of the alarm to be modified, and then the applicant needs to select and confirm to change the set content of the DCS alarm, wherein the alarm content comprises one or more of the following items: 1) the type of alarm; 2) an alarm set value; 3) the level of the alarm; 4) after alarming, manually intervening the specific operation steps;
and 8: and confirming the updating and revising list of the process design document and the operation rule file related to the DCS alarm change.
Further, the change content information in step 6 includes one or more of the bit number of the DCS meter to which the alarm is to be added, the type of the alarm to be added, the specific setting value and unit of the alarm to be added, the level of the alarm to be added, and the manual intervention to be performed after the newly added alarm is triggered in the DCS.
Further, in step 7, if the changed content is the type of alarm or the alarm setting value, it is determined whether to change the high alarm setting value to be high or to change the low alarm setting value to be low; if so, the applicant is asked to confirm that the release of the setting of the alarm value meets the requirement that the operator must be given sufficient intervention time after the alarm is triggered.
Further, in step 7, if the changed content is the alarm level, it is determined whether the alarm level is changed from high to low, and if so, the applicant is required to provide relevant process risk analysis content to confirm whether the risk level of the relevant risk point after the alarm is deleted is still in an "acceptable" range.
The invention has the beneficial effects that: the invention can standardize a large amount of DCS alarm changing activities which do not contain change management in the existing chemical production enterprises, obviously improves the pertinence and the applicability of the activities containing change management on scheme feasibility audit and risk identification evaluation, and simultaneously improves the efficiency of DCS alarm changing.
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Fig. 1 is a flowchart of a standardized management method based on chemical industry DCS alarm change according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict, and the present invention is further described in detail with reference to the drawings and specific embodiments.
If directional indications (such as up, down, left, right, front, and rear … …) are provided in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the movement, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1, the standardized management method based on DCS alarm change in the chemical industry according to the embodiment of the present invention includes steps 1 to 8. The invention gradually carries out the whole change process in a standardized form which is more suitable for DCS alarm management in the chemical production industry.
Step 1: and filling the content of the reason (background introduction) of the DCS alarm change and the purpose (solving the problem and achieving the target) of the change.
Step 2: and selecting and confirming the type of the DCS alarm change. After the data of the past data of the DCS alarm change in the chemical industry is analyzed, the standardized DCS alarm change is divided into three types of 'deleting the existing alarm', 'adding a new alarm' and 'modifying the existing alarm'. The trend of integration and automation control of the chemical production industry is more and more obvious in recent years. More and more various measuring instruments and automatic regulating valves are applied to daily production stability and risk management and control. In the risk Control of daily production, the upper limit and the lower limit of operation on a measuring element (transmitter) with a remote transmission function on various production process parameters (mainly four parameters of flow, temperature, liquid level and pressure) in a DCS (Distributed Control System) System can give an alarm to an operator through color and sound when the actual process parameters reach the set values, which is called as alarm.
An alarm set at the upper limit of the parameter operation is called a high alarm; similarly, an alarm set at the lower operational limit of the parameter is referred to as a low alarm. Changing the existing high alarm set value to be higher or changing the low alarm set value to be lower can trigger the alarm to remind the operator later after the modified alarm deviates from the parameters in the DCS, and if the alarm is reminded too late, the operator does not have enough intervention time to pull the alarm back to the normal operation range (the operator does not have enough intervention to complete, and the deviating parameters have serious consequences such as device jump stop, safety valve jump, substance leakage casualties and the like). Such modifications can therefore lead to an increase in the risk level there, requiring additional attention.
And step 3: specific contents of the change are described, for example, "delete high alarm of PICA-001", "change existing high alarm set value of TIA-002 from 60 ℃ to 75 ℃", or "add low alarm of LIA-003, set value is 25%".
And 4, step 4: attaching three classes of documents that must be provided for reference to change management auditors: 1) a data table of an instrument measuring element transmitter (which contains information such as the position number, the range, the measuring precision, the instrument type and the like of the instrument) with the DCS alarm setting to be changed; 2) the specific setting information (such as position number, range, existing alarm setting and the like) of the instrument measuring element transmitter to be changed in the DCS alarm setting in the DCS system currently; 3) alarm information ledger (containing all the existing specific information that alarms have been set).
And 5: if the type "delete existing alarm" is selected in step 2, the system asks the applicant to provide relevant process risk analysis content to confirm whether the risk level of the relevant risk point after deletion of the alarm as a protection layer is still in the "acceptable" range. Specific risk analysis conclusions should be submitted in the form of LOPA (protective layer analysis) analysis reports.
Step 6: if the "increase alarm" type is selected in step 2, the system asks the applicant to confirm and refine the specific increase information filled in step 3 again. The method comprises the steps of 1) adding the bit number of the DCS instrument to be alarmed; 2) the type of alarm to be added (high alarm/low alarm); 3) specific set values and units of alarm are added; 4) the level of alarm to be increased (priority intervention level); 5) and the newly added alarm is triggered in the DCS and then needs to be executed to manually intervene specific operation steps. This step also requires the applicant to confirm that the setting of a specific alarm value must satisfy the requirement that the operator must be given sufficient intervention time (not less than 20 minutes) after the alarm is triggered.
The definition of the explicit intervention time is here the time interval from the alarm being triggered to the alarm not acting as due protection so that the next layer of protection measures is triggered. The next layer of protection measures are usually the interlocking vehicle-jumping protection function and the safety pressure relief devices (safety valves, explosion relief sheets and the like) of the control system. If the process point is the last layer in the protection measures at the DCS alarm, the definition of the intervention time is the time interval from the alarm being triggered to the alarm not playing the role of due protection, which leads to the occurrence of accident consequences.
The intervention time is set to not less than 20 minutes, and if the alarm parameter is the liquid level, it is relatively easy to calculate the corresponding alarm value. For example, the next layer of protection is high level interlocking with an interlock value of 95%. The liquid level rising of 20 minutes is calculated according to the maximum feeding amount and the sectional area of the storage tank and is assumed to be 2%, and the high liquid level alarm value is 95% -2% = 93%. If the setting of 94.5% results in the alarm occurring, the high liquid interlock is already triggered during the intervention of the operator, which means that the protective measures of alarm + human intervention do not have the due effect to prevent the liquid level from rising, and finally the accident consequence is avoided by means of the interlock. However, the setting of alarm values for other types of process parameters (flow/temperature/pressure) than liquid level, because the 20 minute intervention time of the three types of process parameters, pressure, temperature and liquid level, is influenced too much by the production conditions and process parameters, can only be estimated and not accurately calculated. Inquiring the time interval of the deviation of the process parameters through a DCS system or other systems for recording the operation parameter trend in the past time. And (3) calculating a specific value which can be reached in 20 minutes by using the slope of a parameter curve (the change value of the process parameter in unit time) when the deviation occurs, and deducing from the trigger value of the next protective layer (such as an interlock or a safety valve) for alarming in advance, wherein the specific value is the set value for alarming.
And 7: if the type of 'modification alarm' is selected in step 2, the system first requires the applicant to confirm the DCS bit number of the alarm to be modified. The applicant is then asked to choose to confirm which one or more of the following changes to the existing alarm: 1) the type of alarm; 2) an alarm set value; 3) the level of the alarm; 4) and manually intervening the specific operation steps after alarming.
The contents of the modified alarm relate to the type of alarm (high alarm/low alarm) or the alarm set point, the system determines whether the decision is to change the high alarm set point to high or the low alarm set point to low. If so, the system may require the applicant to confirm that the release of the setting for a particular alarm value meets the requirement that the operator be given sufficient intervention time (no less than 20 minutes) after the alarm is triggered. See step 6 for details of the determination method.
Modifying the content of the alarm if it relates to the level of the alarm (priority intervention level), the system determines whether it belongs to changing the alarm level from high to low (from priority handling intervention to optional intervention). If so, the system may require the applicant to provide relevant process risk analysis content to confirm whether the risk level of the relevant risk point after the alarm is deleted is still within an "acceptable" range. Specific risk analysis conclusions should be submitted in the form of LOPA (protective layer analysis) analysis reports.
And 8: and finally, confirming the updating and revising list of the process design document (such as an alarm ledger) and the operation procedure file related to the DCS alarm change.
The invention has the following beneficial effects:
firstly, a standardized management system for standardizing the change of DCS alarm setting is established aiming at the automatic production of the chemical industry;
secondly, three types of DCS changes are defined: "delete existing alarm", "add new alarm", and "modify existing alarm", and standardize the corresponding change application and approval process for three different changes.
Thirdly, relevant reference documents to be submitted in the DCS change management are clarified: 1) a data table of an instrument measuring element transmitter (which contains information such as the position number, the range, the measuring precision, the instrument type and the like of the instrument) with the DCS alarm setting to be changed; 2) the specific setting information (such as position number, range, existing alarm setting and the like) of the instrument measuring element transmitter to be changed in the DCS alarm setting in the DCS system currently; 3) alarm information ledger (containing all the existing specific information that alarms have been set).
Fourthly, standardizing the change content related to DCS alarm change: 1) the bit number of the DCS instrument to be added with the alarm is added; 2) the type of alarm to be added (high alarm/low alarm); 3) specific set values and units of alarm are added; 4) the level of alarm to be increased (priority intervention level); 5) and the newly added alarm is triggered in the DCS and then needs to be executed to manually intervene specific operation steps.
Fifth, the method comprises the following steps: in two types of change processes of deleting an existing alarm and modifying the existing alarm, identification and evaluation aiming at process risks possibly caused by the change forcibly requires protective layer analysis (LOPA) content as a decision design basis.
And sixthly, specific contents of the manual intervention measures after alarming are brought into a DCS alarm change standardization flow in the chemical industry so as to ensure that the alarming and the corresponding manual intervention form a complete and effective risk reduction measure (protective layer).
Seventh, a technical standard and a specific calculation method not shorter than 20 minutes are provided for specific set values of alarms which are generally confused in the industry. The main basis is that when an actual alarm occurs, an operator cannot immediately judge and make correct intervention. He needs to perform the following three steps to complete an accurate intervention:
1) receiving an alarm and judging whether the alarm is false alarm or real;
2) if the alarm is true, analyzing relevant process parameters and trends and searching possible external influences are needed, and real reasons are identified from a plurality of possible reasons which can cause the process deviation;
3) for this reason, a targeted operating intervention (an operating intervention which requires a coordination with an external operation takes a longer time) is carried out. Meanwhile, even if the process parameters in the alarm state (exceeding the operation limit) are taken correct measures, the process parameters need to be recovered to the normal range for a certain time (for example, even if the overtemperature reaction kettle is immediately fully opened, the temperature of the clamping sleeve cooling water needs to be reduced by a process).
The invention provides an alarm value setting standard which is not shorter than 20 minutes of intervention time according to the best practice of various domestic and foreign petrochemical and chemical industries.
Example 1: take the high alarm to delete PICA-001 as an example:
step 1: after filling and deleting the background and reasons of the pressure PICA-001 high alarm, clearly writing the aim (the specific problem to be solved) which is expected to be achieved by the implementation of the change;
step 2: selecting the change type as 'delete existing alarm';
and step 3: fill in the details of the change "delete high alarm for PICA-001";
and 4, step 4: in the example, a DCS system is attached to a meter data sheet (Datasheet, which contains information such as the position number, the range, the measurement precision, the type of the meter, and the like of the meter) of the pressure remote transmitter PT-001 at the PICA-001, and specific setting information (such as the position number, the range, the existing alarm setting, and the like) of the current DCS system of the meter measuring element transmitter to be changed in the DCS alarm setting; 3) an alarm information ledger (containing all the existing specific information with alarm already set);
and 5: the type of alarm alteration we choose in step 2 is to delete the existing alarm, so the applicant needs to provide a protective layer analysis (LOPA) in which, after removing the existing "alarm PICA-001+ human intervention" protective layer, it is necessary to manage the original risk or not to still meet the "acceptable risk" criteria specified by the company. If not, the change is aborted; if yes, entering step 8;
step 6: the alarm change type we choose in step 2 is to delete the existing alarm instead of adding an alarm, so this step is skipped;
and 7: the type of alarm change we choose in step 2 is to delete the existing alarm instead of modifying it, so this step is skipped;
and 8: confirming the process design documents (such as alarm ledgers for recording all alarm information of a whole plant) which need to be modified due to the deletion of the PICA-001 high alarm and the operation procedure contents which can be influenced due to the deletion of the alarm, listing the documents and providing the contents of the documents which should be revised after the modification.
Example 2: increase the low alarm of LIA-003, the set value is 25%:
step 1: after filling the background and reasons for increasing the low alarm of the liquid level LICA-001, clearly writing the aim (solving the specific problem) expected to be achieved by the implementation of the change;
step 2: selecting the change type as 'adding new alarm';
and step 3: filling the changed specific content, "increase the low alarm of LIA-003, set value is 25%";
and 4, step 4: in the example, we need to attach a DCS system to measure an instrument data sheet (Datasheet, which contains information such as the position number, the range, the measurement precision, the instrument type, etc. of the instrument) of the liquid level remote transmitter LT-003 at the LIA-003, and specific setting information (such as the position number, the range, the existing alarm setting, etc.) of the instrument measurement element transmitter to be changed in the DCS system at present; 3) an alarm information ledger (containing all the existing specific information with alarm already set);
and 5: the type of alarm change we have selected in step 2 is "increase alarm", so this step is skipped;
step 6: the alarm change type selected in step 2 is to add an alarm, so the following five pieces of information must be filled:
1. the DCS instrument position number to be added with alarm is as follows: in this example, LIA-003 was filled;
2. type of alarm to be added (high alarm/low alarm): in this example, a low alarm is selected;
3. the specific set value and unit of the alarm to be added are as follows: the set value 25, unit% is filled in this example;
in addition, the applicant is required to confirm that 25% of the set alarm value meets the requirement that the operator needs to be given enough intervention time (not less than 20 minutes) after the alarm is triggered;
4. alarm level to be increased (priority intervention level): the selection from the three levels high/medium/low in this example depends on the severity of the problem that needs to be solved to initiate this change, e.g. we choose "medium"
5. After the alarm to be added is triggered in the DCS, the manual intervention concrete measures which need to be executed by the operating personnel are as follows: in this example "DCS operator stops operation of tank T-003 outlet flow pump P-003 immediately to ensure that the liquid level does not continue to decrease";
and 7: the type of alarm change we choose in step 2 is to add an alarm instead of modifying an alarm, so this step is skipped;
and 8: identifying the process design documents (such as alarm ledgers for recording all alarm information of the whole plant) which need to be modified due to the addition of the LIA-003 low alarm and the operation rule contents which can be influenced due to the deletion of the alarm, listing the documents and providing the contents of the documents which should be revised after the change.
Example 3: the high report set value of TIA-002 is changed from 60 ℃ to 75 ℃:
step 1: after filling and modifying the background and the reason of the TIA-002 low alarm, clearly writing the aim (the specific problem to be solved) expected to be achieved by the implementation of the change;
step 2: selecting the change type as 'modifying the existing alarm';
and step 3: filling the changed specific contents that the high report set value of the existing TIA-002 is modified from 60 ℃ to 75 ℃;
and 4, step 4: in the example, a DCS system is required to be attached to an instrument data table (Datasheet, the inside of the data table contains information such as the position number, the range, the measurement precision and the instrument type of the instrument) of the temperature remote transmitter TT-002 at TIA-002, and specific setting information (such as the position number, the range and the existing alarm setting) of an instrument measurement element transmitter to be changed in the DCS alarm setting in the DCS system at present; 3) an alarm information ledger (containing all the existing specific information with alarm already set);
and 5: the type of alarm change we have selected in step 2 is "modify existing alarm", so this step is skipped;
step six: the type of alarm change we have selected in step 2 is "modify existing alarm", so this step is skipped;
step seven: the alarm change type we choose in step 2 is to modify the existing alarm, so we have to fill in the following five pieces of information:
1. type of alarm to be modified (high alarm/low alarm): in this example, high alarm is selected;
2. the specific set value and unit of the alarm to be modified: fill set value 75 in this example;
here the modification belongs to a modification of the high alarm set value (risk increase), so that the applicant is required to confirm that the setting of the new alarm value must satisfy the requirement that the operator must be given sufficient intervention time (not less than 20 minutes) after the alarm is triggered; (if the high alarm is changed to low, the modified alarm will appear to prompt the operator in the DCS earlier than before the modification, so there is no need to re-evaluate whether there is sufficient 20-branch intervention time)
3. Alert level to modify (priority intervention level): in the embodiment, the content of the alarm level is not modified, so that the original level is maintained;
4. after the alarm to be modified is triggered in the DCS, the operator needs to execute the specific manual intervention measures: in this example, the high temperature alarm is changed from 60 to 75 ℃, so that the alarm will remind the operator in the DCS system later, and therefore, a more efficient intervention mode may be required to reduce the temperature more quickly in terms of intervention measures, so that the content of the original intervention measures, namely ' slowly adjusting the flow rate of cooling water fed into the reaction equipment to be increased ' is changed into ' immediately fully opening the cooling water valve ', and meanwhile, a reaction terminator is injected into the reaction kettle to reduce the reaction heat release ';
and 8: confirming the process design documents (such as an alarm ledger for recording all alarm information of a whole factory) which need to be modified due to modification of TIA-002 high alarm and the operation rule contents which can be influenced due to deletion of the alarm, listing the documents and providing the contents that the documents should be modified after the change.
Chemical plants have various production processes and risks with great differences due to different specific products, but alarm management has a general rule exceeding the specific production processes. Firstly, no matter how many alarms are, the setting contents mainly comprise five parts of the position number of a DCS instrument transmitter, the alarm type (high alarm/low alarm), the specific set value and unit of the alarm, the alarm grade (priority intervention grade) and the specific manual intervention operation steps which need to be executed after the alarm is triggered in the DCS. In addition, the majority of alarms associated with production processes are four types of process parameters set in chemical production: flow, temperature, pressure and level.
Therefore, the invention can standardize a large amount of DCS alarm changing activities which do not contain change management in the existing chemical production enterprises, obviously improves the pertinence and the applicability of the activities containing change management on scheme feasibility audit and risk identification evaluation, and simultaneously improves the efficiency of DCS alarm changing.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A standardized management method based on chemical industry DCS alarm change is characterized by comprising the following steps:
step 1: inputting the reason of DCS alarm change and the purpose of changing expectation achievement;
step 2: selecting the type of DCS alarm change, wherein the type of DCS alarm change is divided into three types of 'deleting the existing alarm', 'adding a new alarm' and 'modifying the existing alarm';
and step 3: inputting and changing specific content;
and 4, step 4: importing a document for reference of a change management auditor, wherein the document comprises a data table of an instrument measuring element transmitter of which the DCS alarm setting is to be changed, specific setting information of the instrument transmitter in a DCS system at present and an alarm information ledger;
and 5: if the type of 'deleting the existing alarm' is selected in the step 2, prompting an applicant to provide related process risk analysis content to confirm whether the risk level of the related risk point after the alarm as the protective layer is deleted is still in a preset 'acceptable' range;
step 6: if the type of 'adding new alarm' is selected in the step 2, the applicant is prompted to confirm again and refine the specific detail information of the changed content input in the step 3;
and 7: if the type of 'modifying the existing alarm' is selected in the step 2, prompting an applicant to confirm the DCS position number of the alarm to be modified, and then selecting and confirming the change of the set content of the DCS alarm by the applicant, wherein the alarm content comprises one or more of the following items: 1) the type of alarm; 2) an alarm set value; 3) the level of the alarm; 4) after alarming, manually intervening the specific operation steps;
and 8: and confirming the updating and revising list of the process design document and the operation rule file related to the DCS alarm change.
2. The standardized management method based on chemical industry DCS alarm change of claim 1, wherein the change content information in step 6 comprises one or more of the number of the DCS meter to be added with the alarm, the type of the alarm to be added, the specific set value and unit of the alarm to be added, the grade of the alarm to be added, and the specific operation steps of human intervention to be executed after the newly added alarm is triggered in the DCS.
3. The standardized management method based on chemical industry DCS alarm change of claim 1, characterized in that in step 7, if the changed content is the type of alarm or the alarm set value, it is determined whether to change the high alarm set value to be high or the low alarm set value to be low; if so, the applicant is asked to confirm that the release of the setting of the alarm value meets the requirement that the operator must be given sufficient intervention time after the alarm is triggered.
4. The method as claimed in claim 1, wherein in step 7, if the changed content is the alarm level, it is determined whether the alarm level is changed from high to low, and if so, the applicant is required to provide the relevant process risk analysis content to confirm whether the risk level of the relevant risk point after the alarm is deleted is still in the "acceptable" range.
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