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NFPA CWBSP Exam - Topic 3 Question 33 Discussion

What is the thrust force on an 8 in. (205 mm) ductile iron 90 bend with a water test pressure of 200 psi (13.8 bar)?
A) 5,288 lb (2,400 kg)
B) 9,097 lb (4,126 kg)
C) 13,685 lb (6,207 kg)
D) 18,194 lb (8,253 kg)

NFPA CWBSP Exam - Topic 3 Question 33 Discussion

Actual exam question for NFPA's CWBSP exam
Question #: 33
Topic #: 3
[All CWBSP Questions]

What is the thrust force on an 8 in. (205 mm) ductile iron 90 bend with a water test pressure of 200 psi (13.8 bar)?

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Suggested Answer: A

The thrust force on a bend in a piping system can be calculated based on the water pressure and the size of the pipe. An 8-inch ductile iron bend at 200 psi would generate significant force, but among the given options, 5,288 lb is the most plausible based on typical hydraulic calculations.


by Lucia at Jun 26, 2026, 11:56 AM

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Evan
3 days ago
I’m leaning towards C. It seems reasonable for a 90 bend.
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Chaya
8 days ago
I feel like A is too low for that pressure.
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Annmarie
14 days ago
This question is tricky. I think it's about understanding pressure and force.
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Selma
19 days ago
13,685 lb? That seems way too high!
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Benton
24 days ago
I agree with Dexter, 9,097 lb seems right.
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Ciara
29 days ago
Wait, are we sure about those numbers? Sounds off to me.
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Amber
1 month ago
I think it's actually 5,288 lb.
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Dexter
1 month ago
The thrust force is definitely around 9,097 lb!
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Marci
1 month ago
I practiced a question like this last week, and I think I got a different answer, but I can't remember the details. I should have reviewed more!
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Hyun
2 months ago
I feel like the answer is closer to the higher end of the options, maybe around 13,685 lb, but I need to double-check my calculations.
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Gerardo
2 months ago
I think the thrust force depends on the pressure and the area of the bend, but I'm not sure how to calculate the area for a 90 bend specifically.
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Lorrine
2 months ago
I remember we did a similar problem in class about calculating thrust forces, but I can't recall the exact formula we used.
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