Oxygen combines with highly oxidizable material produced during second stage heating.Temperatures may reach 160 to 170 degrees F.Heat is produced by bacterial and fungal activity.Carbohydrates combine with oxygen to yield carbon dioxide, water, and heat.If the rod is too hot to hold in your hand when you take it out, the situation is critical. If you don’t have a thermometer, drive an iron rod into the material and leave it for fifteen to twenty minutes. NOTE: Chopped materials (hay, straw, corn stalks) stored in a pile are more likely to spontaneously ignite than the same materials in bale form.ĭrive a pointed tube into the stored hay and lower a thermometer into the tube. If there is enough hay or straw around a hot spot to prevent the escape of heat, and a slow infiltration of damp air, the hot spot will burn. If the heat developed in the pile can readily escape, the hay or straw only turns brown or gets moldy. Whether it actually burns depends mainly on the size of the pile and the materials surrounding it. Hay Mow FiresĪ pile of hay or straw that contains more than 30 percent moisture is a fire hazard. Luckily the wind was favorable and, with the shielding provided by the silo, the house was saved. Barn and silo fires destroy human lives as well as buildings, equipment, feed and livestock.Īfter this barn fire, only the useless sheet metal roof and the remains of the water pipes and stanchions were left to haul away. Silage may spontaneously ignite when it is ensiled at less than 40 percent moisture. Barn fires, usually caused by spontaneous ignition of hay, occur during and after the haying season. Numerous barn and silo fires occur annually in Wisconsin.
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