Which of the following hazards can be protected with this design criteria?

Based on an existing hydraulic placard located at the sprinkler system riser, the design of the sprinkler system is based on a density of 0.495 gpm/ft2 (20.1 mm/min) over an area of 2000 ft2 (186 m2). Sprinklers in cabinet are 286 degrees.

Which of the following hazards can be protected with this design criteria?
A . Class IlI encapsulated commodity stored on single and double row racks to a storage height of 22 ft (4.9 m).
B . Class IV nonencapsulated commodity stored on single and double row racks to a storage height of 20 ft (6.1 m) with 8 ft (2.4 m) aisles.
C . Group A nonexpanded plastic stored in stable piles to a maximum height of 15 ft (4.6 m) in a 25 ft (7.6 m) high building.
D . Group A plastic stored on single and double row racks to a maximum height of 15 ft (4.6 m) in a 25 ft (7.6 m) high building.

View Answer

Answer: D

Explanation:

Group A plastics, even when stored on racks, present a high challenge to sprinkler systems due to their high heat release rates. The given design criteria, especially the density of 0.495 gpm/ft² over an area of 2000 ft², might be suitable for controlling fires in Group A plastic commodities stored to the specified height, considering the use of high-temperature rated sprinklers (286 degrees) which are typically used in high-challenge fire scenarios.