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Water flushing of rock chips from horizontal holes drilled by rotary percussion

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dc.contributor.author Kilfoil AM en
dc.date.accessioned 2016-09-22T11:26:46Z
dc.date.available 2016-09-22T11:26:46Z
dc.date.submitted 1997 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/121924
dc.description.abstract The flushing flow rate required to maximise penetration rate of holes drilled by rotary percussion is dependant on drilling parameters and chip size. Experimental work to determine the optimal flushing water flow rate for two common drilling situations was undertaken. It consisted of drilling, analysis of chip samples and flow visualization. A computer model to predict flow rate was developed. Its output and the experimental results were combined to explain the relationship between penetration rate and flow rate.<br><br> All chips should be flushed from the gap between the bit and the end of the hole in the time between hammer blows (i.e. within the duration of a percussion cycle). As flow rate increases, flushing improves and therefore penetration rate increases. Once flushing is adequate there is no mechanism for further increases in penetration rate, thus it remains constant and independent of further increases in flow. en
dc.language English en
dc.title Water flushing of rock chips from horizontal holes drilled by rotary percussion en
dc.type Masters degree en
dc.description.degree MSc(Eng) en


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