【简答题】
有那些阀门的物料必须排入D601
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答案
（1）环管反应器顶部安全阀（PSV221，PSV241，PSV242，PSV243，PSV251，PSV252，PSV253）。
R201，R202底部紧急排放阀（HV20404A/B/C，HV20504A/B/C）。
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