What is a smooth bore nozzle used for?
Smooth Bore Fire Nozzles Often referred to as “the staple of American fire service,” smooth bore nozzles produce the greatest reach/gpm combination compared to other nozzle types. Smooth bore nozzles also use the lowest engine pump pressures, allowing for maximum reach.
What is the difference between a fog nozzle and a smooth bore nozzle?
The difference between the solid stream and the straight stream goes beyond the solid vs. hollow stream. The water droplets produced by the straight stream of the fog nozzle are smaller than those produced by the solid stream of the smooth bore nozzle. The nozzle tip of the one-piece nozzle cannot be removed.
Why does FDNY use smooth bore nozzles?
The smooth-bore will also maintain the same water pattern to reach the seat of the fire, keeping the pattern compact and getting large amounts of water at the seat of the fire.
When was the fog nozzle invented?
Fog nozzles and spray streams have been around for almost 150 years. The first United States patent for a fog nozzle was granted to Dr. John Oyston in 1863. During the late 1800s and continuing through the turn of the century, various articles appeared in fire service literature extolling the merits of spray streams.
Can fog put out a fire?
In an enclosed space, water mist, or fog, can be used to put out any type of fire.
Why does a nozzle make the water spray so fast and so far?
The same amount of water being pumped into the hose at the same force now has a smaller area from which to escape the hose. Because pressure equals force divided by area, when the area lessens, the pressure increases. The hose can’t expand to accommodate more water, so the water has to shoot out the opening faster.
How many PSI is a fire hose?
The usual working pressure of a firehose can vary between 8 and 20 bar (800 and 2,000 kPa; 116 and 290 psi) while per the NFPA 1961 Fire Hose Standard, its bursting pressure is in excess of 110 bar.
Does putting your thumb over a hose increase pressure?
When you put your thumb over the end of the hose you change the flow dynamics in the hose. So with less pressure being lost in the hose, the pressure at the end of the hose where your thumb is increases. The tighter you squeeze your thumb, the more the flow is reduced, and the greater the pressure you feel will be.
How far can water be sprayed?
Between 75 feet and 100 feet straight up, depending on water pressure. In practice, though, firefighters on the ground rarely attempt to reach higher than 40 feet with hoses.
Should be sprayed on the surface of the water?
Answer: insecticides is the correct answer.
Why oil fires should not be sprayed with water?
Oil fires are caused when oil catches fire accidentally. The use of water to put off oil fires is not suitable. This is because water is heavier than oils. If we spray water in case of an oil fire, water will sink below the oil and oil on the top will keep burning.
What happens when water is sprayed on fire?
When water hits fire it boils, turns to steam and floats away, taking some heat with it. It also prevents oxygen from reaching the fuel. Most fire extinguishers work by separating the fuel from the oxygen. The oxygen comes from the air.
How is oxygen removed from a fire?
Removal of oxygen from the area around a fire can be achieved with a carbon dioxide extinguisher or a fire blanket. The carbon dioxide extinguisher pushes oxygen away from the fire and replaces it with carbon dioxide, which is inflammable and more dense than air.