【简答题】
环管丙烯置换是用什么压力，置换几次，泄压至什么压力再充气，置换后在什么压力下保压，为什么
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答案
环管丙烯置换是用0.7MPaG，置换2次。泄压至火炬系统的背压再充气。置换后在1.0MPaG压下保压。防止液相丙烯进入环管后汽化，大量吸热，使垫片松动而造成环管泄漏，对正常开车不利。
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