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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.
Suggested Answer: A
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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.
21 comments · newest first
TI
Timothy
1 month ago
I feel like stability is key here. A or B might work best.
GE
Gerry
1 month ago
D has a good flow rate, but less area.
AL
Allene
1 month ago
C seems reasonable too, but higher flow rate.
CH
Chandra
2 months ago
Why A? I prefer B. More coverage!
SH
Sharita
2 months ago
I think option A is the safest.
LI
Ligia
2 months ago
This question is tricky!
VE
Veronica
2 months ago
I’m confused. Why is height so important in this question?
CA
Carlene
2 months ago
But what about the area coverage? Option B looks good too.
KI
Kiera
2 months ago
I agree with Refugia. More water can help control the fire.
RE
Refugia
3 months ago
I’m leaning towards option C. Higher flow rate seems better.
TO
Tom
3 months ago
I feel like option A is the safest choice.
CA
Cassie
3 months ago
This question is tricky. I think it’s about understanding the criteria well.
RO
Rodrigo
3 months ago
0.85 gpm/ft2? That seems high for just a pile of plastic!
FE
Felicia
3 months ago
Wait, why is everyone picking A? C seems more appropriate.
LA
Lauran
4 months ago
Not so sure about A, I lean towards C.
ER
Eric
5 months ago
Definitely A! That seems to be the standard.
LE
Leota
5 months ago
I think it's A, 0.70 gpm/ft2 over 2000 ft2.
RO
Rory
6 months ago
I thought the closed arrays meant we needed to focus on the larger area, which might point to option B, but I’m not entirely confident.
AH
Ahmed
6 months ago
I feel like the minimum design criteria should be higher for nonexpanded plastics, so maybe C or D could be correct.
YA
Yasuko
6 months ago
I remember practicing a similar question where we had to determine the water application rates, but I can't recall the exact numbers.
JO
Joaquin
6 months 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.