【Daily Question Question 318】2017.12.02

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【Daily Question No. 318】December 02, 2017: Among the following conditions, which one is not intended to prevent hydrogen embrittlement? ( ) A. Minimizing the strain amplitude, as well as reducing thermal stress and avoiding stress concentration. B. When the unit is shut down, the cooling rate should not be too fast, and unplanned emergency shutdowns should be avoided as much as possible. C. After shutting down, carry out neutralization cleaning using a sodium carbonate solution at a concentration of 1.5%–2%. C (Unless otherwise specified, all questions and answers are based on hydrogenation units. ) For management purposes, if you need to view content from a few days ago, please access it through the summary post below. 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 (Source: Haichuan Chemical Industry Forum)