PURPOSE:To prevent the guality deterioration of coal, by jetting a pressurized fluid from a jetting pipe inseted into coal in a coal yard to cool the coal at any position of a heap low cost. CONSTITUTION:The pressurized water 20 is fed from the inlet 5 of the jetting pipe 10 and jetted from the tip 3 and the jet nozzles 4, and stuck to the surface of the coal 30 in a coal yard, thus inserting the pipe 10 into the cool 30 by digging action of the water 20. The water 20 is continuously jetted from the tip 2 and nozzles 4 to diffuse radially and sent to a wide range in the coal 30.
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