【Q&A Question 225】2017.08.13
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【Q&A Question 225】August 13, 2017: What tasks should a centrifugal pump carry out during normal operation? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Check the bearing temperature; check whether there are any abnormal vibrations in the pump body and the motor; check for leaks in the shaft seals, as well as whether the quality and level of the lubricating oil are normal; listen to the sound produced by the pump to determine if it is operating normally; check that the pressure, flow rate, and cooling water levels are all within normal ranges. Scoring criteria: 2 Wealth points for incorrect responses; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by detailed explanations; responses that are correct but lack sufficient details earn 15–20 Wealth points. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have no relation to the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Savings” Campaign (Second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
Check the bearing temperature and vibration, pump outlet pressure, current, flow rate, oil level, seal tank liquid level, etc
1) Check according to the operational parameters whether the pump’s outlet pressure, flow rate, and current are within the rated range; operation beyond these limits is not allowed. (2) Check the motor bearings, the motor body, the pump bearings, and the inside of the pump for any abnormal noises. When such noises are detected, it is necessary to promptly identify the source of the noise; if the noise is severe, the machine should be stopped to determine the cause of it. (3) Check whether the operating temperatures of various components are within the allowable range. (4) Check the lubrication condition of the pump; verify whether the oil ring is able to supply oil, check for any oil leakage from the bearing housing cover, ensure that the oil level is between 1/2 and 2/3 of the tank’s capacity, and confirm that the lubricating oil meets the required quality standards. If the oil is found to be degraded or contain water, it should be replaced promptly. (5) Check that the cooling water and flushing oil in all areas are flowing smoothly to prevent interruptions. (6) Check for leaks in the sealing device. (7) Fill in the pump operation record. (8) Maintain the cleanliness of the pump area and the pumps.
1) Check according to the operational parameters whether the pump’s outlet pressure, flow rate, and current are within the rated range; operation beyond these limits is not allowed. (2) Check the motor bearings, the motor body, the pump bearings, and the inside of the pump for any abnormal noises. When such noises are detected, it is necessary to promptly identify the source of the noise; if the noise is severe, the machine should be stopped to determine the cause of it. (3) Check whether the operating temperatures of various components are within the allowable range. (4) Check the lubrication condition of the pump; verify whether the oil ring is able to supply oil, check for any oil leakage from the bearing housing cover, ensure that the oil level is between 1/2 and 2/3 of the tank’s capacity, and confirm that the lubricating oil meets the required quality standards. If the oil is found to be degraded or contain water, it should be replaced promptly. (5) Check that the cooling water and flushing oil in all areas are flowing smoothly to prevent interruptions. (6) Check for leaks in the sealing device. (7) Fill in the pump operation record. (8) Maintain the cleanliness of the pump area and the pumps.
①Check the pump’s outlet pressure, flow rate, and current against the operating parameters to ensure they are within the specified ranges; operation beyond these limits is not permitted. ②Check the motor bearings, the motor housing, the pump bearings, and the inside of the pump for any abnormal noises. When such noises are detected, it is necessary to promptly identify the source of the noise; if the noise is severe, the machine should be stopped to determine the cause of it. ③Check whether the operating temperatures of all components are within the allowable range. Motor section: Motor bearings and rolling bearings ≤ 75°C; sealed motors ≤ 80°C. Pump section: Bearings, rolling bearings ≤ 70°C, sliding bearings ≤ 65°C, sealing devices ≤ 90°C. ④Check the lubrication of the pump; ensure that the oil ring is able to supply oil, and verify that there is no oil leakage from the bearing box covers and plugs. Check whether the oil level is between 1/2 and 2/3 of the tank’s capacity, and confirm that the lubricating oil meets the required quality standards. If the oil is found to be degraded or contain water, it should be replaced promptly. ⑤Check that the cooling water and flushing oil in all areas are flowing smoothly to prevent interruptions. ⑥Check for leaks in the sealing devices; in accordance with the established standards, for packer seals, the oil leakage rate should be ≤10 drops per minute, for mechanical seals it should be ≤5 drops per minute, and for light oil seals it should be ≤10 drops per minute. ⑦Fill in the pump operation record. ⑧Maintain the cleanliness of the pump area and the pumps.
(1) Check the lubrication oil level and quality of the pump； (2) Check for leaks in the mechanical seal ； (3) Check the motor current ； (4) Check the outlet pressure and seal oil pressure of the pump ； (5) Check the temperature and vibration of the bearing housing and motor; the equipment makes no abnormal noises ； (6) Check whether the pump’s cooling water is functioning properly ；
(1) Check according to the operating parameters whether the pump’s outlet pressure, flow rate, and current are within the rated range; operation beyond these limits is not permitted. (2) Check the motor bearings, the motor body, the pump bearings, and the inside of the pump for any abnormal noises. When such noises are detected, it is necessary to promptly identify the source of the noise; if the noise is severe, the machine should be stopped to determine the cause of it. (3) Check whether the operating temperatures of all components are within the allowable range. (4) Check the lubrication of the pump; verify whether the oil ring is able to supply oil, check for any oil leakage from the bearing housing cover, ensure that the oil level is between 1/2 and 2/3 of the container, and confirm that the lubricating oil meets the required quality standards. If the oil is found to be deteriorated or contain water, it should be replaced promptly. (5) Check that the cooling water and flushing oil in all areas are flowing smoothly to prevent interruptions. (6) Check for leaks in the sealing device. (7) Fill in the pump operation record. (8) Maintain the cleanliness of the pump area and the pumps.
Daily maintenance such as checking current, pressure, flow rate, oil level, and for any abnormal noises
Check the outlet pressure, pump bearing temperature, lubricating oil level, and pump vibration
Check the pump outlet pressure； Lubricant level ； Status of cooling water supply ； Operating current