Oil pump type for the lubricating oil station of the main fan unit in the catalytic device
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The oil pump type used in the lubricating oil station of our plant’s main fan unit is a centrifugal pump. There is a safety risk in that, even after the main oil pump starts up automatically following the start-up of the auxiliary oil pumps, the oil pressure remains below the value required to prevent shutdown. I would like to ask you about the type of oil pumps used in the lubricating oil stations of your large-scale units and how they are utilized.
Most gas stations are equipped with centrifugal pumps; some also use a steam system along with a small turbine. Under normal circumstances, things should not go as you described. You might consider setting the start-up value for the backup pump higher, so that the pressure provided by this pump does not drop to the level that triggers interlock mechanisms.
This post was last edited by chengkang on 2010-2-26 at 10:10. Generally, to ensure the safety of the unit’s lubrication system and prevent the unit from shutting down due to low or absent lubrication pressure, large-scale units use positive-displacement pumps such as screw pumps in their oil supply systems; these pumps have the advantage of being able to deliver fluid quickly, thus avoiding the problems mentioned by the poster.
Our company’s lubricating oil pump for the main fan uses a screw pump, and the same type of problems occurred there as well. Later, we replaced the operation column of the oil pump with a self-starting type; this way, the oil pump does not stop after a power outage, and it continues to operate even after power is restored via the operation column. The result was good.
1. Add a reservoir. 2. Use a high-sensitivity control valve for the return flow from the oil circuit to the tank. 3. Install a orifice plate at the check valve on the pump outlet to prevent air accumulation.
There are several ways to address the situation you mentioned: 1. Use a turbine to drive the main oil pump. 2. If both lubrication oil pumps are driven by motors, an electrical trip interlock can be added, so that when the electrical system of the operating pump fails, the auxiliary pump starts automatically. This can shorten the time it takes for the auxiliary pump to start automatically due to low oil pressure in the collector pipe. 3. Add a low oil pressure at the pump outlet interlock to start the auxiliary pump. 4. Add a pressure reservoir
We use screw pumps, and there have been no problems with them over these past ten-odd years
Agree with what was said on floor 7; it’s usually like that.
I’ve learned it; go back to the device and check that part