1 Introduction.- 2 Automatic Sprinklers A Brief Overview.- 3 NFPA 13.- 4 Those Magic Words Hydraulically Calculated.- 5 A Word About the Math.- 6 A Few Words About the Units of Measurement.- 7 Back at the Lab What Has Been Going on There.- 8 The Evolution of the Sprinkler Choose Your Weapons With Care.- 9 What Are We Calculating.- 10 Discharge from a Sprinkler.- 11 Elevation Change.- 12 Sprinkler Piping Nothing is Simple These Days.- 13 Friction Loss of Water Flowing in a Pipe.- 14 Underground Fire Service Mains.- 15 Losses from Fittings and Valves.- 16 Backflow Preventers.- 17 Velocity Pressures.- 18 The Hydraulically Most Remote Area.- 19 Flow Velocity as a Constraint.- 20 Calculating a Dead-End Sprinkler System.- 21 Relating Hydraulic Calculations to the Water Supply.- 22 A Simplified Method for Calculating Pipe Schedule Systems.- 23 Factory Mutual Data Sheet 2-76.