The vertical vibration of the turbine’s rear bearing is high
Thread Content
After the fluctuation in the circulating water pressure of Unit #1 in our company, the vertical vibration of the turbine’s rear bearing increased; there was also a noticeable vibration in the pipes carrying circulating water to and from the condenser, as well as within the condenser itself； Similarly, the vibration of Unit #2, which also receives power from the main pipe, does not experience such large fluctuations. (The circulating water main is closer to Unit #2)
It is likely caused by a significant change in the lubricant temperature.
Many people don’t realize the impact of lubricant temperature on vibration, which shows that you have noticed the relationship between the two! Additionally, according to the poster, the pipes vibrate; in my opinion, there is gas in the water, similar to a minor water hammer effect, which requires attention. It is necessary to find a high point where proper venting can be carried out.
Personally, I think an analysis should be conducted from the perspective of the condenser’s operating conditions and installation; it seems quite dangerous as the condenser causes vibration in the turbine unit
I have a question: it is said that the oil temperature affects vibration – does this refer to the effect of oil viscosity on vibration?
I recommend paying attention to the conditions of the oil. In the case of gas turbines operating under light load, the oil temperature inside the bearings should not exceed 50°C–60°C. For turbines operating under medium or high load, turbine oil with better high-temperature oxidation resistance should be used. An increase in vertical vibration of the bearings may be caused by wear particles present in the turbine oil, leading to periodic changes in the oil film; in severe cases, this can result in axial movement of the bearing housings. It is advisable to conduct tests and analyses to assess the condition of the oil and determine whether there is wear in the equipment or issues with the oil itself.