What is the function of a riser nipple in a sprinkler system?

The function of a riser nipple in a sprinkler system is indeed to supply sprinkler lines from the cross main. A riser nipple serves as a vertical pipe, connecting the main water supply to the distribution system for the sprinkler heads. It typically allows the water to flow vertically upwards from the cross main, ensuring that the sprinkler heads receive the necessary water supply to function effectively.

In the context of a sprinkler system, this component is essential for routing water to various sections of the system, facilitating proper coverage for fire suppression. By serving as a direct connection point for the sprinkler lines, the riser nipple is crucial for maintaining the system's operational integrity and ensuring that water is delivered efficiently where needed.

The other functions listed, while important in various contexts of a sprinkler system, do not accurately describe the specific role of a riser nipple. Connecting to the water supply is a general description that does not capture the precise nature of the riser nipple’s function in supplying specific sprinkler lines. Similarly, while an outlet for water flow can typically refer to various parts of a plumbing system, it doesn't specify the riser nipple's unique role. Finally, monitoring water pressure is a task for pressure gauges and other monitoring devices, not for a riser nipple. Thus,