Water supplies shall be designed to meet the fixed fire protection demand plus 250 gpm for inside and outside hose streams for at least 60 minutes, unless otherwise specified in the occupancy standards.

Water supplies shall be designed to meet the fixed fire protection demand plus 250 gpm for inside and outside hose streams for at least 60 minutes, unless otherwise specified in the occupancy standards.

• A. +100 gpm
• B. +250 gpm
• C. +500 gpm
• D. +750 gpm

Answer: (B)

The main idea is that the water supply for these foam-water systems must provide, in addition to the fixed demand of the sprinkler system, an extra 250 gpm specifically for hose streams for a full hour. This extra flow supports ongoing firefighting with interior and exterior hoses, ensuring there’s enough water for attack lines even as the fire grows or lasts longer. If occupancy standards call for something different, that can override this default, but absent that specification, 250 gpm is the required increment. So, adding 250 gpm to the fixed fire protection demand is the standard approach; options that add less than 250 gpm would under-supply for hose streams, while larger increments are not specified here unless the occupancy standards require them.

The main idea is that the water supply for these foam-water systems must provide, in addition to the fixed demand of the sprinkler system, an extra 250 gpm specifically for hose streams for a full hour. This extra flow supports ongoing firefighting with interior and exterior hoses, ensuring there’s enough water for attack lines even as the fire grows or lasts longer. If occupancy standards call for something different, that can override this default, but absent that specification, 250 gpm is the required increment.

So, adding 250 gpm to the fixed fire protection demand is the standard approach; options that add less than 250 gpm would under-supply for hose streams, while larger increments are not specified here unless the occupancy standards require them.