What is the primary function of risers in a sprinkler system?

The primary function of risers in a sprinkler system is to supply feed mains or cross mains directly. Risers are vertical sections of piping that transport water from the underground supply or the main supply line to the horizontal piping systems where the sprinklers are located. This function is crucial because it enables the efficient distribution of water throughout the system, ensuring that all areas of protection receive adequate coverage.

By supplying the necessary pressure and flow to the system's lateral lines, risers play a key role in ensuring that the sprinkler heads can operate effectively when activated. Their design must accommodate both the vertical lift of the water as well as any potential pressure losses that may occur as water travels through the system. This function is vital for the overall effectiveness of the fire protection system in extinguishing or controlling fires.