When multiple hoses are needed, what is the typical approach to opening discharge valves?

• A. Open the line with the highest pressure requirement first
• B. Open all lines at once
• C. Open the line with the lowest pressure first
• D. Do not monitor pressures

Answer: (C)

When several hoses are needed, open the discharge line with the lowest pressure requirement first. Starting with the easiest line allows the pump to begin delivering water with a lighter load, so pressure can build gradually. As that line comes up to flow and the system stabilizes, you can progressively open the other lines that require higher pressures. This sequence helps control pressure and flow, reducing the risk of water hammer, pressure spikes, or overloading hoses and fittings. Opening all lines at once or jumping straight to a high-pressure line can create sudden demand and destabilize the system, while not monitoring pressures leaves you unable to manage these changes safely.