LYCOS RETRIEVER 
Spontaneous Combustion: Fires
built 656 days ago
The process of spontaneous combustion involves both microbial growth and chemical changes and may be slow to develop. The wet hay will first stimulate microbial growth and as these organisms grow they produce heat while drying out the surrounding surfaces of the hay for energy. More drying surfaces produces more microbial growth and different types of microbes live and die as the internal bale temperature climbs.
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In a crematoria, where temperatures reach from 700 to 1,000 degrees, human bones are not destroyed - making cases of spontaneous combustion an even more mind-boggling phenomena. In the 1980's Dr. John de Haan reported that this phenomena is likely caused by the melting of body fat. This is known as the "wick effect," which makes human body fat literally burn like a candle. Because pigs have similar fat content to humans, Dr. Haan experimented by using a dead pig, wrapping it in a blanket with a small amount of petrol poured onto it, and placing it in a controlled indoor environment. He then set fire to it to simulate a human body being burned. Within 5 hours, the charred remains were identical to those in the spontaneous human combustion cases, with items placed in the same room untouched, other than a nearby television, which was warped from the heat - but not from the fire itself.
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The recent flooding on Washington’s west side requires close monitoring of stored hay for signs of spontaneous combustion. Dry hay (stored at 15 percent moisture or less) is safe for long-term storage. However, if the hay has become wet the quality has been permanently changed and the potential fire hazard from spontaneous combustion increased.
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Lives have been lost and hay crops destroyed because of fires caused by spontaneous combustion. This year has been particularly bad for hay heating due to the hot humid weather. If the hay crop is put into the mow above 20-25% moisture content, spontaneous combustion may occur.
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It is still an open question whether such organic nitrogenous matters as damp grain or seeds of any kind ever undergo spontaneous combustion. In a case recorded in the Annales d’Hygi�ne for 1841. MM. Chevallier, Ollivier, and Devergie drew the conclusion that a barn had caught fire from the spontaneous combustion of damp oats which were stored in it. No such cases are known to have occurred in this country.
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