When the flow through a hose line increases from 100 gpm to 400 gpm, the friction loss increases _____ times.

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Prepare for the Ben Hirst Fire Apparatus Driver and Operator Exam 1. Utilize flashcards and multiple choice questions, each with hints and explanations. Ace your exam!

Multiple Choice

When the flow through a hose line increases from 100 gpm to 400 gpm, the friction loss increases _____ times.

Explanation:
Friction loss in a hose of fixed diameter increases with the square of the flow. As flow goes from 100 gpm to 400 gpm, the flow increases by a factor of 4. Since loss ∝ Q^2, the friction loss increases by 4^2 = 16 times. So the friction loss is 16 times greater at 400 gpm than at 100 gpm. For example, if it’s 5 psi per 100 ft at 100 gpm, it would be about 80 psi per 100 ft at 400 gpm.

Friction loss in a hose of fixed diameter increases with the square of the flow. As flow goes from 100 gpm to 400 gpm, the flow increases by a factor of 4. Since loss ∝ Q^2, the friction loss increases by 4^2 = 16 times. So the friction loss is 16 times greater at 400 gpm than at 100 gpm. For example, if it’s 5 psi per 100 ft at 100 gpm, it would be about 80 psi per 100 ft at 400 gpm.

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