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【Daily Question No. 205】July 24, 2017: When the lubricating oil in the high-level tank of the cyclic hydrogen compressor is operating normally, the oil enters through the flow control orifice plate at its bottom, and returns to the oil tank via the pipe at the top equipped with a sight glass, in order to prevent ( ) in the high-level tank. A. Pipeline blockage B. Decreased oil temperature and deposition of impurities C. Drop in liquid level D. Rise in liquid level. The reference answers can be seen after returning; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) B grading criteria: 2 Wealth points for incorrect attempts; *incomplete* answers result in 3–8 points. 10 Wealth points are awarded for correct answers, provided there is a detailed explanation; if additional *answers* are missing, 15–20 Wealth points are given. Please use these criteria for scoring. 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 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