A riser in a fire sprinkler system is which type of pipe that connects the underground supply to the rest of the system?

A riser in a fire sprinkler system is which type of pipe that connects the underground supply to the rest of the system?

• A. Lateral
• B. Horizontal
• C. Secondary
• D. Vertical

Answer: (D)

Risers are the vertical conduits that bring water from the underground main up into the building’s sprinkler system. The term itself implies upward movement, so this pipe connects the underground supply to the rest of the system on all floors. Having it vertical allows water pressure to reach sprinklers on higher levels and keeps the feed organized through a riser shaft or room. In contrast, a lateral pipe would run horizontally to distribute water along a floor, not connect the underground main to the system above; horizontal and secondary terms don’t describe the main upward feed in the same way.

Risers are the vertical conduits that bring water from the underground main up into the building’s sprinkler system. The term itself implies upward movement, so this pipe connects the underground supply to the rest of the system on all floors. Having it vertical allows water pressure to reach sprinklers on higher levels and keeps the feed organized through a riser shaft or room. In contrast, a lateral pipe would run horizontally to distribute water along a floor, not connect the underground main to the system above; horizontal and secondary terms don’t describe the main upward feed in the same way.