What is the approximate friction loss in 400 feet of 2-1/2" hose flowing 300 gpm?

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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

What is the approximate friction loss in 400 feet of 2-1/2" hose flowing 300 gpm?

Explanation:
Friction loss in a hose run grows with both the amount of water moving and the length of hose. For a given hose size, you use a friction loss value per 100 feet from charts and multiply by the length. In 2-1/2-inch hose at 300 gpm, the typical friction loss is about 18 psi per 100 feet. For a 400-foot run, that’s 4 segments of 100 feet: 4 × 18 ≈ 72 psi. So the approximate friction loss is around 72 psi. Keep in mind this is an estimate; actual loss can vary a bit with hose condition, fittings, and elevation.

Friction loss in a hose run grows with both the amount of water moving and the length of hose. For a given hose size, you use a friction loss value per 100 feet from charts and multiply by the length.

In 2-1/2-inch hose at 300 gpm, the typical friction loss is about 18 psi per 100 feet. For a 400-foot run, that’s 4 segments of 100 feet: 4 × 18 ≈ 72 psi. So the approximate friction loss is around 72 psi.

Keep in mind this is an estimate; actual loss can vary a bit with hose condition, fittings, and elevation.

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