I love the CSB’s work, but this study could have been said in really simple terms… State Fire Code(s)! I have written dozens of articles explaining the specific requirements of the International Fire Code (IFC), from which most of the 50 states have adopted some “revised” version. Chapter 50 of the IFC (and those states that adopt it) has very specific requirements for REMOTELY ACTIVED EMERGENCY ISOLATION VALVES. Several of the PSM/RMP Recognized and Generally Accepted Good Engineering Practices (RAGAGEPs) also have requirements for these EMERGENCY ISOLATION VALVES; I often deal with CGA 2.1, 5.10.8.1. But my go-to code is IFC Chapter 50, which states:
(emphasis by me)