[Q&A Question 252] 2016.12.28
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【Q&A Question 252】December 28, 2016: When the reciprocating machine is operating normally, can the blind flange on its inlet nitrogen line be omitted, with two valves used for closure and an intermediate drain opened to facilitate use next time? 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.) ) No, if there is a leak inside the valve, it can still pose a danger. Start-up and shutdown operations are relatively rare; however, internal leakage in valves can lead to mixing of different media, posing significant safety risks~~~ Summary of Q&A posts from 2016 (updated up to December) http://bbs.hcbbs.com/thread-1597792-1-1.html New Normal Cup – 2016 HaiChuan Top 10 Selections – Please recommend candidates http://bbs.hcbbs.com/thread-1654112-1-1.html Third round of evaluation for outstanding management members at HaiChuan http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: HaiChuan Chemical Forum)
If there is slight leakage from the intermediate drain, it is possible to ensure that neither of the two flanged manual valves leaks internally; however, if internal leakage cannot be prevented, a blind plate must be used to create a separation
Well, it depends on the actual situation~~~~ Severe internal leakage means that even with the three-valve assembly in use, it remains a safety hazard~~~~
It must be sealed to prevent internal leakage of the valve from compromising safety
If the valve in the hydrogen section leaks and the vent remains open, it poses a serious safety risk; therefore, immediate action is necessary