What is the minimum pressure required at the nozzle inlet for a combination fog and straight stream nozzle?

What is the minimum pressure required at the nozzle inlet for a combination fog and straight stream nozzle?

• A. 55 psi
• B. 65 psi
• C. 75 psi
• D. 90 psi

Answer: (B)

A combination fog and straight-stream nozzle requires a certain upstream pressure to reliably form both spray patterns. The internal design of this nozzle—its orifices and mixing chambers—is sized so that at least 65 psi at the nozzle inlet is needed to produce the fog pattern and still maintain a usable straight-stream option. If the pressure at the nozzle inlet falls below this minimum, the fog won’t atomize properly and the straight stream may lose its punch or become unstable. So, 65 psi is the minimum pressure that ensures the nozzle can function correctly in both modes. Pressures higher than that are acceptable and may enhance performance, but they’re not the required minimum.

A combination fog and straight-stream nozzle requires a certain upstream pressure to reliably form both spray patterns. The internal design of this nozzle—its orifices and mixing chambers—is sized so that at least 65 psi at the nozzle inlet is needed to produce the fog pattern and still maintain a usable straight-stream option. If the pressure at the nozzle inlet falls below this minimum, the fog won’t atomize properly and the straight stream may lose its punch or become unstable.

So, 65 psi is the minimum pressure that ensures the nozzle can function correctly in both modes. Pressures higher than that are acceptable and may enhance performance, but they’re not the required minimum.