【Q&A Question 036】2018.02.05
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【Q&A Question 036】February 5, 2018: What are the reasons for overheating of centrifugal pump bearings, and how to deal with it? Reasons: Low or interrupted cooling water flow. 2. The lubricating oil is too dirty. 3. Too much or too little lubricating oil. 4. Other installation or component issues. 5. Poor alignment between the motor and the pump. Solutions: 1. Adjust the cooling water flow. 2. Replace the lubricating oil. 3. Drain some of the oil or add more. 4. Have a blacksmith handle it. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently underway in the Chemical Engineering section) https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978. Summary post of daily questions for the 2018 Chemical Engineering Technology Training section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971. Summary post of daily images for the 2018 Registered Equipment section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970. Summary post of Q&A questions for the 2018 Hydrogen Production and Hydrogenation Technology section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968. Summary post of daily questions for the 2018 LNG Technology Discussion section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973. Summary post of Q&A questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html. Summary post of daily questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html. Summary post of daily images for 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160. List of daily questions for the 2017 LNG section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162. Summary post of Q&A questions for 2016 (updates completed): https://bbs.hcbbs.com/thread-1597792-1-1.html
1) The motor and pump shaft are not aligned； (2) Insufficient lubricating oil ； (3) The lubricating oil is emulsified, deteriorated, or contains impurities; it is not up to standard ； (4) Excessive lubricating oil ； (5) Cooling water interruption ； (6) The oil slinger jumps out of its fixed position ； (7) Bearing damage ； (8) Shaft bending, rotor imbalance. Solution: (1) Contact a blacksmith for repairs ； (2) Add sufficient lubricant ； (3) Replace with qualified lubricating oil or add new grease ； (4) Adjust the lubricant level to an appropriate level ； (5) Adjust the cooling water to ensure its smooth flow ； (6) Switch to the backup pump and contact a fitter for repairs.
Reason: 1) The motor and pump shaft are not aligned； (2) Insufficient lubricating oil ； (3) The lubricating oil is emulsified, deteriorated, or contains impurities; it is not up to standard ； (4) Excessive lubricating oil ； (5) Cooling water interruption ； (6) The oil slinger jumps out of its fixed position ； (7) Bearing damage ； (8) Shaft bending, rotor imbalance. Solution: (1) Contact a blacksmith for repairs ； (2) Add sufficient lubricant ； (3) Replace with qualified lubricating oil or add new grease ； (4) Adjust the lubricant level to an appropriate level ； (5) Adjust the cooling water to ensure its smooth flow ； (6) Switch to the backup pump and contact a fitter for repairs.
1) The pump shaft and the motor shaft are not aligned. 2) High motor load. 3) There is too much or too little oil in the tank. 4) The motor will not operate if one phase is missing. 5) Degraded lubricating oil. 6) The motor generates heat on its own. 7) Improper bearing assembly
Reasons: Low or interrupted cooling water flow. 2. The lubricating oil is too dirty. 3. Too much or too little lubricating oil. 4. Other installation or component issues. 5. Poor alignment between the motor and the pump. Solutions: 1. Adjust the cooling water flow. 2. Replace the lubricating oil. 3. Drain some of the oil or add more. 4. Have a mechanic handle it
Reasons for overheating of centrifugal pump bearings: (1) Excessive lubricating oil; (2) Insufficient lubricating oil; (3) Damaged lubricating oil; (4) Misalignment of the unit; (5) Vibration. Solutions to overheating of centrifugal pump bearings: (1) Reduce the amount of oil; (2) Add more oil; (3) Drain and clean the oil reservoir before filling it with new oil; (4) Check and adjust the alignment of the pump and the drive motor; (5) Check the balance of the rotor or operate it at a lower flow rate
This post was last edited by “The Moon in My Hometown is Round” on February 5, 2018, at 09:49. Reasons: 1. Insufficient or interrupted cooling water flow； 2. The lubricating oil is too dirty ； 3. Bearing failure ； 4. Poor alignment ； Treatment: 1. Increase the flow rate or activate the cooling water ； 2. Replace the lubricating oil ； 3. Replace the bearing ； 4. Re-center
Reasons: Low cooling water flow or interruption. 2. The lubricating oil is too dirty. 3. Too much or too little lubricating oil. 4. Other installation or component issues. 5. Poor alignment between the motor and the pump. Solutions: 1. Adjust the cooling water flow. 2. Replace the lubricating oil. 3. Drain some of the oil or add more. 4. Have a blacksmith handle it.
Reasons: Low cooling water flow or interruption. 2. The lubricating oil is too dirty. 3. Too much or too little lubricating oil. 4. Other installation or component issues. 5. Poor alignment between the motor and the pump. Solutions: 1. Adjust the cooling water flow. 2. Replace the lubricating oil. 3. Drain some of the oil or add more. 4. Have a blacksmith handle it.
1. When a centrifugal pump used for a certain period of time experiences abnormally high bearing temperatures, it is usually due to wear or loosening of the bearings as a result of prolonged operation; in such cases, new bearings should be installed. 2. If the newly installed bearings experience excessive temperature, it indicates that the bearings of the centrifugal pump were not installed correctly; the bearings should be reassembled in accordance with the requirements. 3. Excessively high bearing temperatures in centrifugal pumps are caused by a disruption in the balance of the rotating parts of these pumps; this condition should be checked and corrected. 4. The oil in the bearing housing is too little, too much, or too dirty; the bearing oil has deteriorated, resulting in high temperatures of the centrifugal pump bearings. In such cases, it is necessary to add new lubricating oil. If you wish to use bearings that do not require lubrication, self-lubricating sealed bearings can be chosen; for example, pipeline centrifugal pump products utilize such bearings. 5. In pump models in which the pump head is connected to the motor shaft via a coupling, such as single-stage double-suction centrifugal pumps, if the bearing temperature becomes too high, it may also be due to poor alignment between the pump shaft and the motor shaft; in such cases, the coupling should be realigned. 6. If the anchor bolts are loose or the foundation is not solid, the bolts should be tightened or the foundation reinforced.
1. The axial force of the centrifugal pump is too high. 2. The quality of the lubricant is poor, and it fails to provide lubrication. 3. Lubricants and greases have been in use or stored for too long. 4. The cleanliness of the oil reservoir does not meet the requirements for use. 5. Improper use or pairing. 6. No lubricating oil or grease, or insufficient lubricating oil or grease. 7. The quality of the bearings is poor, resulting in movement of the inner ring or the outer ring. 8. High external conductive temperature, resulting in insufficient cooling. Treatment: 1. Reduce the axial force of the centrifugal pump and lower its flow rate ； 3. Add lubricating grease ； 4 Re-center ； 5. Poor flow of bearing cooling water, excessive temperature of the cooling medium; 2. Replace the lubricating oil ； 3