Tire fires are events that involve the combustion of large quantities of tires, usually waste tires, typically in locations where they are stored, dumped, or processed. They exist in two forms: as fast-burning events, leading to almost immediate loss of control, and as slow-burning pyrolysis which can continue for over a decade. They are noted for being difficult to extinguish. Such fires produce much smoke, which carries toxic chemicals from the breakdown of synthetic rubber compounds while burning. [1]
Tire fires are normally the result of arson or improper manipulation with open fire. Tires are not prone to self-ignition, as a tire must be heated to at least 400 degrees Celsius (750 degrees Fahrenheit) for a period of several minutes prior to ignition.
When tires are piled up and get wet, water may diffuse to the carcasses and steel will rust, this is an exothermic reaction (oxidation). Rubber itself is a good insulator, and within the piled/dumped masses temperature will continuously rise. At about 60 degrees Celsius rotten rubber will split off methane and later cyclic hydrocarbons as touluol and xylol, highly flammable and volatile substances. These fumes may easily be ignited, and the process within the pile is continued. Combustion temperature of degraded compounds released by heated tires is thus more consequential than combustion point of the tires themselves.
Metal in tires may contribute to the tire fire. The hot wires act as kind of "glowing spiral" in a storm lighter Zippo with its steel insert in the wick, restarting the fire, when blown out. This is a reason tire fires are so hard to extinguish.
Extinguishing tire fires is difficult. The fire releases a dark, rich smoke that contains cyanide, carbon monoxide, sulfur dioxide, and products of butadiene and styrene. Burning tires are heated, and, as they have a low thermal conductivity, they are difficult to cool down. Moreover, they frequently burn inside even if they are extinguished from outside, and easily reignite when hot. One possible remedy is to cover the fire with sand, reducing the supply of oxygen and the exhaust of smoke. After extinguishing and cooling down (which may last several days), toxic chemicals can be neutralized. [2]
Protestors are known to burn tires as part of protests. [3] [4] Because waste tires are readily available and produce dense smoke, protestors sometimes burn tires and create tire barriers as part of protest. [5] For example, an analysis in The Times of Israel noticed an increasing trend of tire burning in the demonstrations following the 17 October Revolution. [6]
Some notable tire fires include:
In popular culture the phrase is used to mean a horrifying mess that seems to last forever.[ citation needed ]
The TV show The Simpsons is set in a fictional town called Springfield, which features a permanent tire fire. [37]
In S01E02 of The Walking Dead: World Beyond, a tire fire called "The Blaze of Gory" was mentioned.
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