The maximum floor area on any one floor in an ordinary occupancy that is supplied by one system riser is ______ sq ft.

The maximum floor area on any one floor in an ordinary occupancy that is supplied by one system riser is ______ sq ft.

• A. 26000
• B. 52000
• C. 78000
• D. 104000

Answer: (B)

The concept tested is how much floor area a single system riser can hydraulically feed on one floor while maintaining the required sprinkler performance. For ordinary occupancy, the standard design practice uses a maximum of 52,000 square feet per riser on a single floor. This limit reflects the typical hydraulic capacity and pressure requirements to ensure all sprinklers receive adequate flow and pressure without overburdening the pump or causing excessive friction losses. If a floor area exceeds this limit, additional risers or separation into zones would be needed so each zone stays within the capacity and still meets coverage requirements. The other numbers don’t align with the common ordinary-occupancy design guideline: they would either be too small for a single riser given standard densities or too large to be reliably served by one riser.

The concept tested is how much floor area a single system riser can hydraulically feed on one floor while maintaining the required sprinkler performance. For ordinary occupancy, the standard design practice uses a maximum of 52,000 square feet per riser on a single floor. This limit reflects the typical hydraulic capacity and pressure requirements to ensure all sprinklers receive adequate flow and pressure without overburdening the pump or causing excessive friction losses. If a floor area exceeds this limit, additional risers or separation into zones would be needed so each zone stays within the capacity and still meets coverage requirements. The other numbers don’t align with the common ordinary-occupancy design guideline: they would either be too small for a single riser given standard densities or too large to be reliably served by one riser.