Regarding measures after a power outage
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I was deeply moved to see everyone discussing how to deal with the DCS screen going black; I’ve encountered this issue twice with DCS, where no data was displayed at all, and it caused a lot of chaos. This time, I’d like to discuss with everyone what to do in the event of a power outage. Power outages do happen; our factory experienced one once, with a power outage that lasted 12 minutes. In the event of a power outage, 1. First, inform the relevant personnel to stop all pumps to prevent sudden occurrences. Close the pump inlet and simultaneously drain all pumps. 2. Cut off the material discharge at all stages of the process, and communicate properly with the upstream and downstream workshops to prevent material accumulation. 3. Set all pneumatic and electric valves to manual mode, and operate the valves according to the process requirements. 4. Check all agitators, stop them, and inform the staff not on duty to come to the site immediately to manually turn the shafts. After isoelectric recovery, start all agitators first, and then proceed with the flushing process to clean the slurry pipes and pumps. Contact the plant’s main control room and start the operation under their unified instructions; never start the operation blindly.
I wonder if you all have plans in place to deal with power outages. On one hand, it’s necessary to contact the dispatch center promptly in case of a power outage; the dispatch center has relevant plans and can provide unified command. Personally, I think that if each workshop has a power outage plan, it should be followed; if no such plan exists, an emergency shutdown should be initiated. This approach is definitely necessary
For our catalytic unit, power outages are not a problem. Just follow the plan. What’s scary are the surges in voltage; some systems shut down due to these surges, while others do not, as it’s difficult to determine immediately what’s happening, which prevents timely action and often leads to various problems.
After a power outage, a chain reaction of valve closures usually occurs; it also depends on how long the USP can still supply power, and on how many times the instrument air in the reserve tanks can be used to operate the valves. It is necessary to quickly close those valves that could cause the pump to run in reverse or lead to abnormal pressure conditions, as well as those valves that could result in safety accidents. Set all pneumatic and electric valves to manual mode, and open or close the valves according to the process requirements. Then further processing is carried out based on the actual situation.
There is a website that offers solutions to the problem of voltage fluctuations; those who are interested can take a look at it at http://www.goldencooperate.com/UploadFiles/DC-BANK Plan. pdf. This post was last edited by gcmzh on 2008-2-13 at 14:44.]