The pipes that directly supply the branch lines are _______

The pipes that directly supply the branch lines are _______

• A. Risers
• B. Distribution mains
• C. Service lines
• D. Cross main

Answer: (D)

The key idea here is how sprinkler piping is organized to deliver water from the main supply to each sprinkler. On a floor, water typically flows from a horizontal distribution network called a cross main, which is connected to a vertical riser that brings water up from the lower levels. The cross main runs horizontally and then feeds the branch lines that run out to the individual sprinkler heads. So the pipes that directly supply the branch lines are the cross mains. To place the other terms in context: the riser is the vertical pipe that carries water up to the cross main; the distribution mains are the larger pipes that feed the system’s network (including the risers and cross mains) but do not directly feed branch lines; and service lines bring water from the municipal supply into the building’s distribution system.

The key idea here is how sprinkler piping is organized to deliver water from the main supply to each sprinkler. On a floor, water typically flows from a horizontal distribution network called a cross main, which is connected to a vertical riser that brings water up from the lower levels. The cross main runs horizontally and then feeds the branch lines that run out to the individual sprinkler heads. So the pipes that directly supply the branch lines are the cross mains.

To place the other terms in context: the riser is the vertical pipe that carries water up to the cross main; the distribution mains are the larger pipes that feed the system’s network (including the risers and cross mains) but do not directly feed branch lines; and service lines bring water from the municipal supply into the building’s distribution system.