What is the required minimum design density/area for protection of floor stacked, idle wood pallets to a height of 8 ft (2.4 m) under a 30 ft (9.1 m) roof deck using high expansion foam with a K11.2 (160) CMDA sprinkler?

What is the required minimum design density/area for protection of floor stacked, idle wood pallets to a height of 8 ft (2.4 m) under a 30 ft (9.1 m) roof deck using high expansion foam with a K11.2 (160) CMDA sprinkler?
A . 0.225 gpm/ft2 (9.15 mm/min) over 1,250 ft2 (115 m2)
B . 0.225 gpm/ft2 (9.15 mm/min) over 2,500 ft2 (230 m2)
C . 0.45 gpm/ft2 (18.3 mm/min) over 1,250 ft2 (115 m2)
D . 0.45 gpm/ft2 (18.3 mm/min) over 2,500 ft2 (230 m2)

View Answer

Answer: B

Explanation:

For floor-stacked idle wood pallets, a design density of 0.225 gpm/ft² over a minimum design area is typically used for calculating water supply requirements. The larger area option (2,500 ft²) provides a more conservative approach to ensuring adequate protection.

Reference: Fire protection strategies for storage using NFPA 13 guidelines, considering the specific challenges posed by combustible commodities like wood pallets.