Attached are details of the vibration analysis conducted on an Overhang Fan, including waveforms and spectra. The fan underwent both bearing replacement and coating removal, with shaft laser alignment checked twice. Bearing lubrication utilized Grease EP-2. Both bearings are experiencing vertical vibration issues. Suggestions for resolving this problem are welcome. Please refer to the attached document for more information.
What is the significance of motor power, rpm, measuring history, and envelope in machinery?
Upon initial inspection, I would diagnose the issue as mechanical slackness.
Upon initial inspection of the TWFs and FFT, it appears to be a case of looseness and potential friction. However, this is just a preliminary assumption. By delving deeper into the fan's history and addressing specific questions regarding the fan bearings, such as whether both were replaced, why they were replaced, and the condition they were found in, a clearer picture can be painted. It is important to consider factors such as the type and make/model of the bearings, the condition of the shaft mating surface, and the proper installation of the replacement bearings. Additionally, assessing the smoothness of the fan rotation, the presence of any wobble or runout, and signs of rubbing is crucial. Confirming the fan's speed and understanding the significance of any removed fan coating will further aid in troubleshooting. Providing detailed information allows for more accurate and effective assistance from this forum. Regards, Jim P.
From the information provided, it sounds like your fan is experiencing a pretty common issue. One possible reason for the vertical vibrations could be due to imbalance in the fan blades or assembly. Another cause might be misalignment, even though you've had the shaft laser checked twice. Sometimes, despite the best alignment efforts, system dynamics in operation can differ greatly from the initial settings. You could also consider your lubrication process - while the Grease EP-2 is good, over-lubrication or under-lubrication can cause unwanted vibrations. It might be worthwhile to perform a thermographic analysis to gauge the bearing temperatures, to check for any heating issues. Lastly, bearing-fitting practices can also cause such issues, so a thorough check on the installation process might give some insights as well.
From the details provided, it seems you've covered most of the immediate fixes like bearing replacement and alignment checks. Since you're still experiencing vertical vibration issues, I'd recommend looking into the fan balance. An unbalanced fan can cause excess vibration, even with new bearings and proper alignment. Also, it might be worth investigating if the Grease EP-2 is the most suitable for your operation conditions. Different operating temperatures and speeds can have significant effects on the ideal bearing lubrication.
I've had a look at your analysis and it seems quite thorough, great job there. However, I noticed that you utilize Grease EP-2 for bearing lubrication. In my experience, I've found synthetic lubricants to offer better viscosity and temperature stability, which might help lower the extent of the vertical vibrations you're experiencing. Also, it's crucial to ensure the bearings are not over or under-lubricated as it can lead to abnormalities besides impacting the fan balance negatively. Apart from lubrication, verify the fan blade is not damaged or bent as it could be contributing to the vibration as well.
From the provided data, it sounds like the bearings may be experiencing a misalignment or imbalance issue, despite having checked the shaft laser alignment twice. There's also a possibility that the bearing installation was not done properly even if the lubrication used was Grease EP-2, which is a good fit for this type of equipment. My suggestion would be to check on those potential issues first. Also, consider analyzing vibration characteristics in other directions too, not just vertically. Let's not rule out the impact of the coating removal process which could have affected the fan balance or facilitated corrosion. Another point to look into is the type and condition of the support structure as that might affect vibration as well.
It sounds like you've done a thorough job addressing some important maintenance tasks on the fan, but vertical vibration issues can be tricky to diagnose. Have you considered the possibility of imbalance due to the coating removal or misalignment that might have gone unnoticed? Additionally, checking the condition of the fan blades for any wear or damage could also be a factor. It might be worth running an additional balancing test or even looking into the possibility of using a vibration damper if the issues persist.
✅ Work Order Management
✅ Asset Tracking
✅ Preventive Maintenance
✅ Inspection Report
We have received your information. We will share Schedule Demo details on your Mail Id.
Answer: 1. What are some common causes of vertical vibration issues in Overhang Fans? - Common causes of vertical vibration issues in Overhang Fans can include improper bearing installation, misalignment, inadequate lubrication, unbalanced fan blades, or structural issues. 2. How can bearing replacement and coating removal impact vertical vibration issues in an Overhang Fan? - Bearing replacement can help resolve vibration issues caused by worn-out or damaged bearings. Coating removal can eliminate any imbalance issues caused by uneven coating distribution on the fan blades, which could contribute to vertical vibrations. 3. Why is shaft laser alignment important in addressing vertical vibration issues in Overhang Fans? - Shaft laser alignment ensures that the fan components are properly aligned, which can reduce vibration levels and improve overall performance. Checking alignment twice helps to confirm that alignment issues are not contributing to the vertical vibrations.
Answer: - Grease EP-2 lubrication was used for the bearings. Proper lubrication is essential for reducing friction and wear, which can contribute to vibration issues. Using the correct type and amount of lubrication can help mitigate vertical vibration problems in Overhang Fans.
Answer: - Recommendations for resolving vertical vibration issues in Overhang Fans may include conducting a thorough inspection of bearings and components, ensuring proper alignment, balancing fan blades, implementing correct lubrication practices
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.