The requirement for a Fire Safety Analysis (FSA) was introduced in the 1976 edition of
NFPA 58, along with the requirement for emergency shutoff valves at locations where
hoses and swivel type piping were used (for connection to cargo tank vehicles and rail
cars). A Fire Safety Analysis was required for new propane storage plants with
capacities of more than 4,000 gallons located in “heavily populated or congested areas”.