This is my last article in my series regarding excess flow valves. I haveattempted to explain how these devices can aid in controlling a significant leak, as well as how these valves get abused in their design and maintenance. As I have stated before, these valves should NOT be considered a “safeguard” in our PHA’s until we have their design, operation, and maintenance under control. But through all of these articles, the one question I seem to get after each posting is… “Are these EFVs required?” The short answer is YES, but it depends on where the facility is located and which RAGAGEP the facility may be utilizing. I will use the International Fire Code as my basis to demonstrate that Excess Flow Valves are a DESIGN REQUIREMENT for many PSM/RMP covered processes.