There have long been question regarding whether or not an FCC main fractionator needs relief valve protection for anything except some smaller events ,like steam –out or fire .
There have long been question regarding whether or not an FCC main fractionator needs relief valve protection for anything except some smaller events ,like steam –out or fire .
关于是否要FCC标准下主分馏器的的电子管来保护除了像蒸汽或炉火等一类的小事件之外的器件，已经成为了一个长期争论的问题。