What is the minimum design criteria to protect an exposed nonexpanded Group A plastic stored in a solid pile to a maximum height of 15 ft (4.6 m) in…

The minimum design criteria are determined using NFPA 13, Standard for the Installation of Sprinkler Systems. For exposed nonexpanded Group A plastics in a solid pile arrangement, Table 25.3.2.1 provides the protection requirements. For a maximum storage height of 15 ft (4.6 m) and a maximum ceiling height of 26 ft (7.9 m) [which falls under the ≤ 30 ft (9.1 m) category], the table specifies the use of Design Curve G. According to Figure 20.12.3.1.1, "Sprinkler System Design Curves," Curve G corresponds to a design density of 0.70 gpm/ft² over a design area of 2000 ft².

B. This design area (2500 ft²) corresponds to Design Curve H, which is required for higher storage or ceiling heights under different conditions.

C. This design density (0.85 gpm/ft²) is not specified by the required Design Curve G for the given storage and building parameters.

D. Both the design density and area are incorrect and do not correspond to any single design curve applicable to this scenario.

1. NFPA 13, Standard for the Installation of Sprinkler Systems, 2022 Edition, Table 25.3.2.1, "Protection of Indoor Solid-Piled, Palletized, and Bin Box Storage of Group A Plastics (Exposed Nonexpanded)." The row for "Maximum Storage Height ≤ 15 ft (4.6 m)" and the column for "Maximum Ceiling/Roof Height ≤ 30 ft (9.1 m)" intersect at the requirement for "Curve G."

2. NFPA 13, Standard for the Installation of Sprinkler Systems, 2022 Edition, Figure 20.12.3.1.1, "Sprinkler System Design Curves." This figure explicitly defines Curve G as requiring a density of 0.70 gpm/ft² over a remote area of 2000 ft².