【Daily Question】2016 1.8 Multiple-choice question: What should be the standard purity of nitrogen used for pipeline purging? ( )%
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This post was last edited by Guan Gongyu on 2016-1-8 at 10:09. If your insights are very long, please participate in the event to win great prizes! ! ! ! Year-end event – “HaiChuan Gratitude Season” – Custom title. [Petroleum and Chemicals Section] Thread: http://bbs.hcbbs.com/thread-1532394-1-1.html If you have any thoughts or feelings to share, come here and let’s chat about them! ! ! ! Gratitude Stories – My Experience with My Master: A Contest with Prizes (Reply to get +50 wealth points) http://bbs.hcbbs.com/thread-1530494-1-1.html 【Daily Question】January 8, 2016: Multiple-choice question. What should be the standard purity of nitrogen used for pipeline purging? Answer: D A、＞98 B、＞99 C、＞99.5 D、＞99.9
For D-system displacement, the oxygen content is generally required to be below 0.5%; a nitrogen concentration of 99.5% is clearly too low, so 99.9% should be used.
D、＞99.9~~~~~~~~~~~~~~~~~~~
The standard purity of nitrogen used for pipeline purging should be (D)%
The standard purity of nitrogen used for pipeline purging should be ( )%
The standard purity of nitrogen used for pipeline purging should be (d) % A、＞98 B、＞99 C、＞99.5 D、＞99.9