[Q&A Question 205] 2017.07.24
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【Q&A Question 205】July 24, 2017: What should be noted when cooling down a hot oil pump after it has been shut down? 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.) ) Close the inlet valve, outlet valve, and preheating valve tightly ； The cooling water supply to each section cannot be stopped immediately; it must wait until the temperature of each section drops to normal levels before the water supply can be halted ； When cooling down, be careful not to use cold water on the pump body to avoid thermal expansion and contraction; also, make sure to turn the pump shaft manually every 15–30 minutes until the temperature of the pump body drops below 100°C. Scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided with a detailed explanation; 15–20 Wealth points if the answer is correct but lacks sufficient details. 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 nothing to do with 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 Saving” 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
1. The cooling water for each unit cannot be stopped immediately; it must be halted only after the temperature of each unit has dropped to normal levels. 2 Close the inlet valve and preheating valve tightly. 3. Cool down for 15–30 minutes, then rotate the pump once every interval, until the temperature of the pump body drops below 100°C.
Close the inlet and outlet valves. The cooling water must not be stopped; the turbine should be turned manually at regular intervals, by at least 180° each time.
①The cooling water for each section cannot be stopped immediately; it must be stopped only after the temperature of each section has dropped to normal levels. ②Close the inlet valve and preheating valve tightly. ③Rotate the pump every 15–30 minutes as the temperature drops, until the pump body’s temperature falls below 100°C.
Use a heat pump line to control the cooling rate, and rotate the shaft to prevent bending
Close the inlet valve, outlet valve, and preheating valve tightly； The cooling water supply to each section cannot be stopped immediately; it must wait until the temperature of each section drops to normal levels before the water supply can be halted ； When cooling down, be careful not to use cold water on the pump body to avoid thermal expansion and contraction; also, make sure to turn the pump shaft manually every 15–30 minutes until the temperature of the pump body drops below 100°C.
Cut off the system and cool it down slowly to prevent leaks
①The cooling water for each section cannot be stopped immediately; it must be stopped only after the temperature of each section has dropped to normal levels. ②Close the inlet valve and preheating valve tightly. ③Rotate the pump every 15–30 minutes as the temperature drops, until the pump body’s temperature falls below 100°C.
Pay attention to the following points: 1. The cooling water for each section cannot be stopped immediately; it should be stopped only after the temperature of each section has dropped to normal levels. 2. Close the inlet valve and preheating valve tightly. 3. Cool down for 15–30 minutes and rotate the pump once, until its temperature drops below 100°C.