Are there \"combined units that start and stop operations for maintenance at different times\"?
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According to the terminology in GB50160-2008 \"Code for Fire Protection Design of Petrochemical Enterprises\": simultaneous operation and shutdown for maintenance are necessary conditions for identifying a combined facility； However, Article 4.1.2 of SH/T3007-2014 mentions the concept of jointly operating and shutting down maintenance for combined units at different times, as well as regulations regarding the storage period for intermediate raw materials. How do people approach this issue in actual design work? During a previous training session on GB50160, I asked a teacher from Luoyang Institute, and the teacher said, “Isn’t it up to the designer to decide whether it constitutes a combined unit?” If the designer says it’s okay, then it is. ”It is estimated that people from the Luoyang branch might say such things, but it would be hard for others to accept them.
Whether they can start and stop simultaneously depends on whether the entire design of the system allows for direct supply of raw materials from upstream, enabling simultaneous start and stop. In actual production, it is not considered a violation to stop a certain unit and use feed from the tank area; various factors need to be taken into account in production