If there is a sudden power outage across the entire plant, will the DCS program stop working? What emergency measures should be taken in the factory area?

The DCS system should be equipped with a UPS; with such a system in place, the DCS will not experience interruptions for short periods of time.

Doesn’t DCS have an uninterruptible power supply?

Chemical plants usually require dual-power supply, with one circuit taking over automatically if the other fails. If a power outage occurs due to issues with the substation, the control room still has a UPS to provide backup power.

I just want to ask what unexpected situations might arise in case of a power outage?

For factory power supply, dual-circuit supply, that is, two power sources, should be provided for Class 1 loads, with power coming in from two substations. The DCS system requires an UPC power source to ensure power supply during emergency operations for 1–2 hours in the event of a power outage; however, this power supply is only intended for the instrument and valve systems, while gas supply is provided by a separate system

The DCS has a UPS supply in case of power failure. The factory premises should be equipped with internal combustion engine generators if necessary.

There are many situations of system power outages, and generally there are contingency plans for them, but incidents like the fire caused by a power fluctuation on June 3 at Maoming Petrochemical are relatively rare.

Everything is mostly within the expected range; the factory’s power outage plans and various emergency shutdown systems are designed to handle such unexpected situations. It’s hard to say what might happen in unexpected situations, but in the expected cases, it’s usually like this: “TMD, why is there a power outage? I was just about to go have lunch.” ”

Power outages are not allowed for Class 1 electrical loads; therefore, a UPS system that matches the capacity of the electrical equipment should be selected； For secondary electrical load, a dual-circuit reliable power supply from different bus sections is provided ； A third-level electrical load can be powered by a single power supply circuit. The DCS and SIS systems of each unit are classified as primary electrical loads; therefore, in addition to being supplied with power from two separate sources, they are also equipped with a UPS unit whose capacity matches that of the electrical equipment ； Within the project, the production units involving key hazardous chemical processes that fall under the category of \"two key areas and one major area\" for stringent supervision, as well as the water pumps in the refrigeration system, the electricity used in the fire protection system, and certain environmental protection devices, are classified as secondary load types; therefore, a dual-power supply system is installed for them ； Other general production equipment, maintenance and repair facilities, as well as auxiliary living facilities are classified as category III electrical load. Finally, diesel generator sets are installed as required to serve as a backup power source. The above has become the standard mode.