How should stored-pressure water extinguishers be discharged when approaching a fire?

Discharging stored-pressure water extinguishers with the nozzle swept back and forth swiftly is the most effective method for achieving maximum coverage of the fire area. This technique allows the extinguisher to disperse water over a larger surface area, helping to cool the flames and surrounding combustible materials more effectively. By sweeping the nozzle, firefighters can ensure that different parts of the fire receive water and are extinguished, rather than focusing on a single point which may allow the fire to spread.

Using this method is beneficial as it helps manage the heat, reduces the chances of reignition, and addresses moving flames effectively. The dynamic movement of the nozzle not only aids in cooling but also helps to prevent steam pockets from forming, which could pose a risk to the firefighter.

Other techniques, such as pointing the nozzle directly at the fire or maintaining a steady stream, may not provide the same level of coverage and could result in inefficient suppression. Discharging from a distance without movement may limit the effectiveness of the extinguisher, as it would not properly engage with the fire's surface area that needs to be cooled and suppressed.