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#24 - anon (01/28/2016) [-]
other firefighter here
just felt like adding that the cone setting also pushes air out causing the fire to blow away from you at the same time.
#16 - manskeetingmaster (01/28/2016) [-]
thanks for the insight. i remember reading something about preventing flash fires or flashovers i forget exactly what it was called , but when a room gets so intensely hot it might explode or something close to that. to prevent that, a fireman sprays in a certain pattern to dissapate heat, does the cone help in that situation? firefighting techniques and procedures are so fucking cool to read about
#35 - madfunny (01/29/2016) [-]
When attacking a fire in a structure you will typically be more likely to stick with a straighter stream than using the cone. When a fire is burning in a room you get thermal stratification where superheated gases sit on top of relatively cooler gases. So the gases at the top of the room can quickly reach temps above 1000dF but only be between 100-200dF at the floor (gear protects pretty well at these temps).
The point being, if you use too wide of a spray pattern it can move too much air around and quickly turn over that thermal stratification and you can bring down a lot of steam and those superhot gases on top of you. So most firefighters will use a straighter stream and use spray patterns (star, A, etc) where you just do quick shots into the upper layer to cool it, but not enough to upset the layering.
This cooling helps prevent rollover (where the superhot gases at the ceiling get hot enough to ignite such that the fire appears to be rolling across the ceiling, which actually looks pretty cool) and flashover (where all the gases in the room get hot enough that everything from floor to ceiling ignites at once, aka very bad). Backdraft is where you have a fire in a tightly closed space that has generated a lot of heat but used up all the oxygen. The sudden introduction of oxygen causes all of those hot gases to ignite at once resulting in an explosion. Cone pattern isn't really going to help in this situation because once you've breached the area to spray water you've introduced oxygen and it's already too late.
But the cone setting on a nozzle can be used in situations where you want wide coverage in small spaces (e.g. inside an engine compartment or cab of a car). Or to create what or called fog streams which can be used to protect other structures (e.g. if 2 houses are close together and one is burning, spraying a fog stream between the houses can help prevent extension into the second house). The cone pattern can also be used for hydraulic ventilation. Typically if the fire is out and there us a lot of smoke in a room and you cant get good positive pressure ventillation, the firefighter can clear out a window, stand 4-5 feet back and use a cone setting to cover about 80% of the window. This creates a strong air current moving out the window that just pulls all the smoke out with it. I've only ever tried it once but it actually worked suprisingly well.
Always willing to discuss firefighting tactics. Hope this was not too long.
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