I would like to ask about DCS alarm settings
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Are there any standards or guidelines for setting parameters such as pressure, level, temperature, and flow rate on DCS? For example, what values should be set for the upper limit and higher upper limit of the liquid level? Thank you.
This needs to be set according to the device’s design specifications and operational experience; no standards have been seen.
I remember having seen requests for it before, but I can’t find them now
There are no regulatory requirements for this; the regulations only call for improved process management, as well as the establishment of process alarms along with their recording and handling. The setting parameters are determined based on the actual process conditions.
It should be proposed in conjunction with the equipment, production processes, and techniques; there are no fixed values
It is necessary to consider whether the response time is sufficient. If there are safety valves or SIS, personnel should have sufficient time to respond before they activate. To serve as an independent protective measure.
sh3007, you can refer to this specification; it contains information on level setting.
Some are set based on the interlock value, being less than that value, while others are determined by actual operation
◆The \"Code for Design of Tank Areas in Petrochemical Storage and Transportation Systems\" SH/T 3007-2014 also provides detailed regulations regarding the setting of liquid level alarm values for storage tanks: 5.4.2 High and low liquid level alarms shall be installed in the automatic control system, and they shall comply with the following requirements: a) The set height for the high liquid level alarm of a storage tank shall not be higher than the designed maximum liquid level for that tank； b) The set level for the low liquid level alarm in the storage tank should not be lower than the designed low liquid level for storage in that tank.
◆Notice on Further Strengthening the Safety Management of Chemical Tank Areas, General Administration of Work Safety Document No. San 68: Further Enhancing the Safety Management of Chemical Tank Areas (1) Further improve the monitoring and control facilities in chemical tank areas. In accordance with regulatory requirements, high and low liquid level alarms are installed in the storage tank; automatic interlocks are employed to shut down the tank’s feed valve when the liquid level is too high, and to stop material transfer when the liquid level is too low. Ensure that the alarm systems for leaks of flammable, explosive, toxic, and harmful gases are in good working condition. Emergency shut-off valves must be installed on key storage tanks such as those for large-scale liquefied gases and highly toxic chemicals. ◆Notice on Issuing Guidelines for Preventing Serious Accidents Involving Hazardous Chemicals and Fireworks and Firecrackers, Safety Supervision General Administration Document No. San 62: Strengthen risk management and control as well as the identification and rectification of potential hazards. 3. Proactively carry out special rectification efforts for hazardous chemicals, and implement comprehensive key prevention measures: (4) As of January 1, 2017, all hazardous chemical storage areas that constitute Class I or Class II major hazard sources and do not have an emergency shutdown (emergency isolation) function must cease to be in use ；
Set the parameters according to the process requirements, leaving room for response time