NFPA CWBSP Exam - Topic 4 Question 28 Discussion

Actual exam question for NFPA's CWBSP exam

Question #: 28
Topic #: 4

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 a 26 ft (7.9 m) high building? Piles to be stable with closed arrays.

A0.70 gpm/ft2 over 2000 ft2 (28.5 mm/min over 186 m2)

B0.70 gpm/ft2 over 2500 ft2 (28.5 mm/min over 232 m2)

C0.85 gpm/ft2 over 2000 ft2 (34.6 mm/min over 186 m2)

D0.85 gpm/ft2 over 2500 ft2 (34.6 mm/min over 232 m2)

Show Suggested Answer

Suggested Answer: A

To protect exposed nonexpanded Group A plastic stored in a solid pile up to 15 ft high, a design criteria of 0.70 gpm/ft over 2000 ft is typically required. This density and area coverage account for the high combustibility and potential heat release of Group A plastics.

by Colby at Apr 07, 2026, 12:57 AM

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Joaquin

3 days ago

I think the answer might be A, but I'm not completely sure about the specifics of the flow rates for Group A plastics.

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