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Second International Symposium on Jet Cutting Technology 2nd -4th April 1974 Cambridge. Preliminary Experimentation on Coal Cutting in the Pressure Range 500-2000 Atmospheres

This paper describes results of a factorial experiment on coal cutting at a traverse speed of 5 meters/min, with water jets at pressures between 500 and 2,000 atmospheres and nozzle diameters in the range from 0.5 to 1 mm. These results fill a gap in the existing results on coal cutting with water jets and form the basis for the design of a coal cutting machine. The interrelationship between pressure and nozzle diameter as this effects the specific energy of cutting coal is investigated and it is shown that for a given pump horsepower it is more effective to use a large nozzle diameter and accept a lower effective jet pressure than to increase the jet pressure by use of a smaller nozzle.