You just need to understand critical speeds, resonances, and that you shouldn't suddenly change the speed of the rotors. But in _To kill a centrifuge_ Langner describes some games with pressures as well. Adding random valve openings and closings in a refinery, gas plant, sewage plant, etc. will look like intermittent failures and just as hard to 'debug'. Eventually you'll hit a particularly nasty set. Errant monkeys playing with your PLCs. But it must be a slow day at Tech Review..