If friction loss is not accounted for in hose layout, what is a likely outcome at the nozzle?

• A. Insufficient pressure at the nozzle.
• B. Water temperature increases.
• C. The hose will become shorter.
• D. The nozzle will automatically adjust.

Answer: (A)

Friction loss is the pressure drop that happens as water pushes through hose, fittings, and couplings. The longer the run, larger the diameter difference, roughness, and the flow rate, the more pressure is lost along the way. If you don’t account for that loss in your hose layout, the pump’s discharge pressure will be eaten up by friction before the water reaches the nozzle, leaving you with insufficient pressure at the nozzle to deliver the intended stream. That’s why the likely outcome is not enough pressure at the nozzle, which reduces reach and effectiveness. In practice, you must factor friction loss into the layout and adjust hose size, length, or pump pressure to maintain the needed nozzle pressure.