In a long hose lay, why is maintaining adequate water supply important?

• A. To avoid loss of prime and ensure sustained flow.
• B. To maximize friction loss.
• C. To increase engine oil temperature.
• D. To reduce pump RPM.

Answer: (A)

In a long hose lay, the pump relies on a continuous column of water to push water through all the hose and to the nozzle. If the supply to the pump isn't enough, air can be drawn into the suction line and the water column can break. When that happens, the pump loses its prime and can no longer draw water, causing flow to stop or become unreliable. The longer the lay, the more friction losses and potential elevation changes you face, so maintaining a solid water supply is essential to overcome those losses and keep the pump delivering water with a steady flow.