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【Daily Question No. 221】2017.08.09 (True/False): When maintaining equipment and pipelines used for transporting and storing flammable and explosive substances, it is necessary to treat the relevant systems by purging them with inert gas. The reference answers will be visible after () reply; points can be earned by answering the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) √ It closes after 7 days of daily use, with answers displayed automatically. (2017-8-14) Scoring criteria: A wrong answer earns 2 Wealth points; an *incomplete* answer yields 3–8 points. A correct answer with a detailed explanation grants 10 Wealth points, while a correct answer with insufficient additional *answers* earns 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 have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) 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 Zone – “Creative Ideas for Energy Saving” campaign (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum)