Ohio Volunteer Firefighter Practice Exam

What is the psi range for an adjustable stream nozzle?

1. 25-50 psi

2. 50-75 psi

3. 75-100 psi

4. 100-125 psi

The correct answer is: 75-100 psi

An adjustable stream nozzle typically operates within a pressure range of 75 to 100 psi. This range is designed to ensure that the nozzle delivers an effective and controlled stream of water or foam for various firefighting situations. Nozzles set within this psi range can provide adequate reach and velocity, crucial for combating structural fires, vegetation fires, or other scenarios where effective water application is essential. The functionality of an adjustable nozzle allows firefighters to manipulate the stream pattern from a solid stream to a fog pattern while maintaining optimal pressure. Operating within this specific psi range helps prevent equipment damage and guarantees maximum flow efficiency, which can significantly impact the outcome of firefighting efforts. In contrast, ranges below or above this value may not support the nozzle's intended function, either resulting in insufficient flow or potential physical stress on the nozzle and hose system. Understanding these specifications is key for any firefighter to ensure safe and effective water delivery in emergency situations.