turbine
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Do the emergency oil pumps of a steam turbine serve the same purpose as the high-level oil tank? What to use?
The function is the same; both provide lubricating oil when the turbine is running idle. The specific type to use depends on the requirements of design institutes and other entities; different industries have different preferences.
I think the function is the same in both cases; it’s mainly to ensure that, in the event that the main oil pump stops working, lubricating oil can reach the bearings in time to carry away heat and provide lubrication. The workshop where I work uses a high-mounted fuel tank; due to the limited capacity of this tank, it can only provide power for eight minutes before running out of fuel. I think an accident oil pump would be better, as it could be used continuously. Each manufacturer has a different design philosophy
Both are used in the event of an emergency shutdown of the unit: 1. The accident oil pumps include both AC accident pumps and DC accident pumps (traditionally batteries were used, but now UPS power is more common); virtually all units are equipped with these； 2. High-mounted fuel tanks are mostly used in tractor units. Generally, it starts from the horizontal level of the cylinder, and the elevation is usually 6 meters. (The higher the height, the greater the oil pressure and the more pronounced the effect, but the fuel consumption increases as well.) For those equipped with a high-level fuel tank, some sites also have a low-level fuel tank
Our aircraft is equipped with a high-level fuel tank; I’ve never seen an emergency fuel pump. In my opinion, the function of an emergency fuel pump should be better than that of a high-level fuel tank
This is the design intention; however, no interruptions in lubricant supply have occurred during actual production operations
The same – it’s all to provide lubrication for the unit’s idle operation
1 The three-pump configuration of the lubricating oil pump has different names, such as the main oil pump, the emergency oil pump, the accident oil pump, and so on. 2 It has the same function as the high-level fuel tank; the arrangement of the fuel pumps is also designed to ensure that there is no interruption in fuel supply at any time when the main engine is running. 3 The power sources for the three fuel pumps are independent of each other: steam + two power supply sources. Steam drive is used as the main oil pump, while motor drive is used for the auxiliary and emergency oil pumps, both equipped with a self-start function
Here, the emergency oil pump operates on batteries, providing power for 20–30 minutes; only after the emergency pump stops does the oil from the high-level tank flow down to continue lubrication and ensure a safe shutdown of the unit.