What to do if the hydrogen DCS system freezes?

1. If the computer at the operation station freezes, it won’t have a major impact; the operator can go to the engineer station to continue monitoring and operating, waiting for the system to recover. 2. If the engineer station freezes, it’s best to shut down operations urgently, as otherwise safety cannot be guaranteed.

I’ve encountered this situation once: one person should monitor the high liquid level on site, while another is assigned to watch the high pressure; everything else should be handled according to the emergency shutdown procedures. No one wants to take on such a risk. Although the DCS will remember the settings prior to the shutdown, how many people are available to go to the site to verify things? It took us 40 minutes to recover; some parameters are marked with a line as there is no data available for them.

This post was last edited by lijianhuai on 2011-12-23 08:14. I encountered a DCS blue screen once; at that time, only the engineer station had a display and was functional for making adjustments, which is somewhat similar to what the original poster described. One person monitored the entire hydrocracking unit, while the others went to the site to check the liquid levels, pressure, and temperature – for a full 18 hours without stopping, until the instrumentation technician restarted the DCS system and things returned to normal. The operator at that time was completely exhausted; they had to manage three different positions, monitor everything on the office computer in the control room, and the shift leader was always ready to stop production.

This post was last edited by lijianhuai on 2011-12-23 08:15. 1. In the petrochemical industry, DCS system failures can occur in various units, whether they are involved in hydrogenation, catalysis, atmospheric pressure processes, desulfurization, or other operations. The key is knowing how to deal with failures. 2. The reasons for crashes can be attributed to either software issues or hardware problems. Human factors cannot be ruled out either. 3. We experienced a UPS power failure that caused the DCS systems in half of the factory to stop working. Everyone handled the situation calmly, and in the end the problem was resolved. 4. Identifying the cause of the crash is the most important thing; preventing similar situations from occurring is key. 5. There are too many types of failures in automated systems; those who are not in this field cannot understand it. Only through mutual understanding and cooperation to solve problems can production remain stable. 6. Think about it: in the chemical industry, what matters is the level of automation; what’s contested is the degree of automation achieved. Operation relies on an individual’s skills, and these skills are built on a solid foundation in operating automated control equipment. No matter how skilled the operator is, they can’t do much without good equipment. 7. An instrument technician who goes to the equipment to carry out operations can become a good operator, but an operator who moves to an instrument position may not necessarily become a good instrument technician. An automated instrumentation technician is a technical profession; it definitely revolves around technology.