Could everyone please **help check what issues there are with the large machine bearings**
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Main engine oil system of the unit, bearing barring parameters. Time: 2015-4-8 15:00, 2015-5-11 15:00, 2016-3-20 15:00, 2016-6-12 15:00, 2016-8-31 15:00. Main engine lubricating oil pressure: 0.43, 0.426, 0.402, 0.475, 0.478. Lubricating oil temperature: 36.81, 41.34, 1.74, 43.00, 144.47. Jacking oil pressure: 15.85, 15.74, 15.71, 4.38, 16.24. Barring speed: 46.23, 43.48, 49.22, 48.02, 49.23. Temperature of #1 bearing: 137.74, 44.24, 45.94, 43.81, 46.28. Temperature of #1 bearing (2): 36.65, 41.96, 43.37, 43.96, 45.83. Temperature of #1 bearing (3): 41.77, 49.82, 50.46, 49.09, 52.32. Temperature of #1 bearing (4): 39.96, 47.71, 48.54, 7.28, 49.91. Temperature increase: 4.96, 8.52, 8.72, 6.08, 97.85. Temperature of #2 bearing: 141.17, 45.45, 47.64, 3.81, 45.98. Temperature of #2 bearing (2): 39.96, 44.39, 46.69, 43.96, 46.59. Temperature of #2 bearing (3): 45.44, 49.37, 51.11, 45.32, 48.54. Temperature of #2 bearing (4): 45.44, 49.22, 50.81, 46.08, 49.74. Temperature increase: 8.63, 7.92, 9.07, 3.07, 95.27. Temperature of thrust bearings: 137.15, 41.98, 45.53, 44.31, 47.54. Temperature of thrust bearing (2): 36.85, 41.53, 44.93, 44.61, 46.93. Temperature of thrust bearing (3): 37.15, 41.08, 42.82, 44.31, 45.58. Temperature of thrust bearing (4): 36.85, 40.93, 42.51, 43.56, 45.28. Temperature of #3 bearing: 142.12, 44.99, 46.44, 46.12, 54.18. Temperature of #3 bearing (2): 41.52, 45.34, 6.28, 48.23, 56.44. Temperature increase: 4.71, 44.54, 5.22, 911.97. Temperature of #4 bearing: 142.27, 46.31, 47.04, 45.92, 50.3. Temperature of #4 bearing (2): 39.41, 43.94, 4.47, 44.87, 50.15. Temperature increase: 5.46, 5.01, 5.32, 2.91, 95.83. Temperature of #5 bearing: 139.11, 44.05, 44.63, 45.47, 46.83. Temperature of #5 bearing (2): 43.02, 46.76, 48.55, 44.72, 46.98. Temperature increase: 6.21, 5.46, 6.81, 1.71, 92.51. Temperature of #6 bearing: 143.42, 50.28, 51.11, 46.91, 53.05. Temperature increase: 6.61, 8.98, 9.37, 3.90, 98.58. Temperature of #7 bearing: 140.81, 45.55, 46.39, 45.04, 51.63. Temperature increase: 44.25, 4.65, 2.03, 97.16. Temperature of #8 bearing: 135.79, 39.52, 41, 42.46, 44.12. As shown in the table above, 1) The bearing temperature refers to the temperature of the bearing metal; 2) Temperature increase is the difference between this value and the lubricating oil temperature. I would like to ask everyone, can we identify any problems with the bearings based on this information? I can only see that the temperature at measurement point 3 of bearing #1 is the highest, while the temperature at measurement point 2 is generally the lowest. Could it be that there is some uneven wear?
What problems can arise from such low temperatures?
Oh, isn’t this the data from when the machine was rotating? So with a low temperature, is it really impossible to detect any problems?
For the million-unit unit, it underwent a Type B maintenance session after shutting down on March 20. After this maintenance, the temperature rise when rotating bearing #3 was 12°C, which is more than 6 degrees higher than before the maintenance – could the center position have changed? . .
It’s not obvious; let’s check again in a few days
Thank you all**; I just hope to try and speculate about some possible problems
This post was last edited by zjiefire on 2016-9-6 at 16:22. Here are some additional details: Date of adjustment: 2016-3-20 at 5:25; before adjustment, and 2016-8-29 at 5:27 after adjustment. Rotational speed of the crankshaft: 49.376 to 48.719; lubricating oil temperature: 41.997 to 44.465; thrust shaft oil temperature: 40.163 to 44.465; thrust shaft oil pressure: 15.696 to 16.129; water temperature in the open system: 20.808 to 25.715. Oil return temperature for Bearing #1: 46.491 to 49.216; vibration level of Bearing #1 in μm: 32.658 to 23.998; highest temperature reached by Bearing #1: 51.124 to 52.773. Oil return temperature for Bearing #2: 43.262 to 45.288; vibration level of Bearing #2 in μm: 36.053 to 33.077; highest temperature reached by Bearing #2: 51.624 to 48.489. Oil return temperature for Bearing #3: 41.617 to 46.428; vibration level of Bearing #3 in μm: 9.636 to 10.666; highest temperature reached by Bearing #3: 46.748 to 54.028. Oil return temperature for Bearing #4: 42.313 to 44.971; vibration level of Bearing #4 in μm: 7.595 to 8.644; highest temperature reached by Bearing #4: 47.503 to 50.103. Oil return temperature for Bearing #5: 42.503 to 44.971; vibration level of Bearing #5 in μm: 7.088 to 8.644; highest temperature reached by Bearing #5: 48.861 to 46.632. Oil return temperature for Bearing #6: 42.064 to 33.452; vibration level of Bearing #6 in μm: 34.203 to 35.252; highest temperature reached by Bearing #6: 51.415 to 33.148. Oil return temperature for Bearing #7: 36.308 to 43.452; vibration level of Bearing #7 in μm: 18.124 to 15.644; highest temperature reached by Bearing #7: 46.405 to 51.158. Oil return temperature for Bearing #8: 35.992 to 40.795; vibration level of Bearing #8 in μm: 13.031 to 16.635; highest temperature reached by Bearing #8: 41.018 to 43.616
What a professional field. What kind of engine is it? Our company’s million-unit units are also just makeshift; it’s absolutely impossible to reach such a level. I need to learn well from the original poster*
Yes, a 1000MW thermal power plant, steam turbine generator set. Because the high and low pressure cylinders of modern million-unit turbines are much more precise than those of older turbines, making them overall smaller in size. As a result, even minor issues with the shafting or bearings can have significant consequences, and repairing such problems is also very costly. . .