Which statement about solid stream nozzles is correct?

Which statement about solid stream nozzles is correct?

• A. They operate at higher pressures
• B. They produce fog streams
• C. They require variable pressure
• D. Smooth-bore solid stream nozzles operate at lower pressures

Answer: (D)

The key idea is how nozzle design affects the pressure required to deliver a given flow and the type of stream produced. Smooth-bore solid-stream nozzles are designed to deliver a concentrated, coherent jet, which can reach the target effectively at lower nozzle pressures. This makes them simpler and more efficient for penetrating and delivering water without creating a spray. In contrast, fog-stream systems spray water into droplets, which requires higher pressure to create and maintain the spray pattern, so the notion that solid-stream nozzles operate at higher pressures isn’t accurate. They don’t inherently produce fog streams; that’s a characteristic of fog/nozzle types. And while some setups may use different pressures, solid-bore operation is typically associated with relatively fixed, lower pressures appropriate to the nozzle size. Therefore, the statement that smooth-bore solid-stream nozzles operate at lower pressures is the correct one.

The key idea is how nozzle design affects the pressure required to deliver a given flow and the type of stream produced. Smooth-bore solid-stream nozzles are designed to deliver a concentrated, coherent jet, which can reach the target effectively at lower nozzle pressures. This makes them simpler and more efficient for penetrating and delivering water without creating a spray. In contrast, fog-stream systems spray water into droplets, which requires higher pressure to create and maintain the spray pattern, so the notion that solid-stream nozzles operate at higher pressures isn’t accurate. They don’t inherently produce fog streams; that’s a characteristic of fog/nozzle types. And while some setups may use different pressures, solid-bore operation is typically associated with relatively fixed, lower pressures appropriate to the nozzle size. Therefore, the statement that smooth-bore solid-stream nozzles operate at lower pressures is the correct one.