What is the recommended dynamic pressure when using an in-line pressure gauge with specific hose configurations?

The recommended dynamic pressure of 80 psi when using an in-line pressure gauge is based on several factors, including the apparatus's capability, the hose configuration, and the operational requirements for effective firefighting. A pressure of 80 psi is generally seen as a balance that ensures sufficient water flow without exceeding the limitations of the hose and nozzles.

This pressure level allows for optimal nozzle performance, maintaining a strong enough stream to reach the target while minimizing the risk of hose failure or excessive friction loss, especially in longer hose lays or when using multiple lines simultaneously. The 80 psi is often recommended for hand lines, where maneuverability and stream reach are critical for effective fire attack.

In contrast, the other pressure values may not deliver the necessary balance between adequate flow and safety based on specific operational conditions and hose setups. This understanding reinforces the importance of knowing your equipment and the science of water pressure dynamics in firefighting scenarios.