How would you estimate friction loss for 200 ft of 1.75-inch hose delivering 150 GPM?

• A. Use the friction loss chart for 1.75-inch hose at 150 GPM to read per-100-ft loss, then multiply by 2 to account for 200 ft.
• B. Multiply 200 by 150.
• C. Use a fixed 10 psi for all calculations.
• D. No friction loss is assumed.

Answer: (A)

Friction loss in hose depends on how much water is flowing, the hose size, and how long the hose run is. To estimate it, you read the friction loss value from a chart that matches the hose diameter and the GPM, and that value is given per 100 feet. Since you have 200 feet of hose, you multiply the per-100-foot value by 2 to account for the full length. This approach directly uses how friction loss scales with length and flow, giving a reasonable total loss for the 200-ft run at 150 GPM. The other methods aren’t physically consistent with how friction loss works: multiplying length by flow isn’t tied to a loss unit, using a fixed 10 psi ignores variation with flow and size, and assuming no friction loss neglects the real resistance in the hose.