Sprinkler System Definitions
The flanged supply that terminates the underground supply pipe inside
Generally a vertical supply pipe that initially supplies the entire
sprinkler piping network. The sprinkler riser is generally the location
where a transition from underground piping to interior piping occur.
First main supplied from the sprinkler riser. The cross main will
generally be installed parallel to the buildings roof structure.
A transfer main that is supplied by the riser or cross main to supply
a separate or area not supplied from the cross main.
A vertical pipe that supplies sprinkler lines from the cross main.
Generally horizontal piping supplied by the riser nipple From the
cross main. Sprinkler heads may be installed directly on the Branch
line or sprinkler heads will be supplied from the branch line.
Up Right Sprinkler
A sprinkler head that is installed on the top of the sprinkler piping.
An upright sprinkler is installed close to the ceiling so the operating
element of the sprinkler will operate quickly in a fire.
A vertical drop from branch line piping to supply a sprinkler. Drop
nipples supply sprinklers located finished ceilings.
A sprinkler installed to discharge down towards the floor. A pendent
sprinkler can be installed directly on the sprinkler branch line
or from a drop nipple.
Water Flow Alarm Device
An alarm that activates when there is water flow into the system.
The water flow alarm device is generally located on the sprinkler
riser at the initial supply of the system. All sprinkler systems
must have water flow alarms.
Inspectors Test Valve
A valve on the sprinkler system that is opened Periodically to simulate
a water flow through the riser. The valve is Opened to make the
water flow alarm to operate.
Inspectors Test Connection
A discharge pipe and orifice from the Inspectors test valve. The
orifice that must be placed in the connection Is the same as the
smallest orifice sprinkler on the system. This creates The most
demanding water flow for the water flow alarm device.