Fault in the smoke extractor inlet butterfly valve
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Our catalytic unit has been experiencing problems with the butterfly valve at the smoke extractor inlet – it fails to close as intended. We contacted the instrumentation team, who checked for several days without finding any issues. During those checks, an alarm regarding a problem with the oil supply to the butterfly valve appeared; the pressure at the outlet of the oil pump dropped from 90 kilograms to 60 kilograms. When switching to manual operation, the pressure returned to normal, and it also returned to normal after switching back to hydraulic control. Occasionally, alarms related to the oil supply problem reappear at irregular intervals. We asked the maintenance team to check the oil pump’s circuitry, but no cause was found. It’s not possible to keep the maintenance team on site waiting for the next occurrence of this issue. Has anyone encountered such a situation? What could be the cause?
Oil source faults include motor shutdown, excessively high oil temperature, excessively low oil temperature, low liquid level, and high pressure difference in the filter – are any of these familiar to you? ? ?
Reply to 2# Ice and Snow: The operator has so far only seen the oil pressure drop from 90 to 60 kilograms; no alarms have been triggered for any other parameters
The problem still lies in the oil circuit; otherwise, the pressure wouldn’t fluctuate so much. Please check whether the oil circuit loop at the oil pump outlet is installed incorrectly (it looks like a square-shaped object); since it is square in shape, problems can arise during installation. You can try to figure it out on your own – there is always one circuit that is installed correctly. Because we have encountered similar issues here as well; once there was an alarm due to excessive pressure difference in the oil circuit, and the person who came to perform repairs removed the wrong components, tearing apart the oil circuit. They didn’t pay attention to the direction when reinstalling it, which resulted in frequent fluctuations in oil pressure. Later, an experienced repair technician came, identified the cause of the problem, disassembled the oil circuit and reinstalled it, and numbered the four sides of the square to prevent errors during future disassembly and assembly.