Given 100 feet of 3-inch hose with 2½ inch couplings flowing 500 gpm, what is the friction loss?

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Prepare for the USAF Mobile Water Supply (MWS) Fire Test with various study materials including flashcards and multiple choice questions. Enhance your understanding and get ready for success!

Multiple Choice

Given 100 feet of 3-inch hose with 2½ inch couplings flowing 500 gpm, what is the friction loss?

Explanation:
Friction loss in a fire hose line comes from water rubbing against the hose walls as it moves, and it increases with higher flow and longer length while decreasing with a larger hose diameter. For a 3-inch handline at 500 gpm, standard friction loss charts show about 20 psi per 100 feet of hose. Since the run is 100 feet, the friction loss is roughly 20 psi. The 2½ inch couplings don’t significantly alter this value—the calculation depends on the hose bore (3 inches) and the flow, not the coupling size. So the friction loss is about 20 psi.

Friction loss in a fire hose line comes from water rubbing against the hose walls as it moves, and it increases with higher flow and longer length while decreasing with a larger hose diameter. For a 3-inch handline at 500 gpm, standard friction loss charts show about 20 psi per 100 feet of hose. Since the run is 100 feet, the friction loss is roughly 20 psi. The 2½ inch couplings don’t significantly alter this value—the calculation depends on the hose bore (3 inches) and the flow, not the coupling size. So the friction loss is about 20 psi.

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