HMN-Recently, at an industrial fire training, I got some great helmet cam footage of some very experienced firefighters honing in on new skills, and brushing up on old ones. I was able to capture a great shot that illustrates the effect of nozzle patterns, and draft, on a LPG fire.
In the following photo, take note of the size of the cone and the fire being drawn into the center. We always like to harp on moving a hose line in unison as hose handling training before drills like this, but we also need to be aware of the nozzle patterns and their potential impact on fire, or vapor streams.
The photo has a great depiction of the wide pattern beginning to draft vapors toward the nozzle.
The guys in the photo did an amazing job and this is just a small snippet in time of their advancing and successful, safe isolation of this prop.