Sprinkler System Components

Front

Drop

Back

Rigid or flexible pipe that goes from the arm over to the sprinkler head in a ceiling

Front

Arm Over

Back

The horizontal pipe that runs from the branch line to drop or upright

Front

Main

Back

The primary supply pipe that feeds branch lines in a sprinkler system

Front

Branch Line

Back

Pipes connected to the main that supply sprinklers; they typically run perpendicular to the main

Front

Sprig

Back

A sprinkler head installed facing upward

Front

Sidewall

Back

A sprinkler head installed on a wall to spray out and down

Front

Concealed

Back

A sprinkler head covered by a decorative plate that falls off in a fire

Front

Hot work

Back

Welding, cutting, or grinding that can create sparks or heat

Front

Head

Back

Short for sprinkler head

Front

Skirt

Back

The ring or plate that covers the hole in the ceiling or wall where a head is installed