Even though that diagram seems complicated, it really isn’t. If you ever get the chance to play around with a modern automation software in an actual power plant or a factory, you’ll be overwhelmed. The number of tanks, pipes, pumps, valves, flow meters, level indicators, pressure gauges, temperature sensors etc. is absolutely enormous. What you see on the wall would be just a high level overview. Often you would need to drill one or two levels deeper to find what you’re really looking for.
Although, old industrial facilities were very simple by modern standards, so maybe that diagram really did have everything.


