Underground brings water from the city mains to your building.
Water is then sent through a backflow.
All systems usually require an FDC or Fire Department Connection to increase the water pressure during a fire.
Enters either the fire pump where it is pumped to a certain pressure, or is released into the riser.
Risers “rise” vertically through the floors to feed the branch lines.
Branch Lines then extend off the risers and mains horizontally to bring water to all the sprinkler heads.