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38 ISCAR GENERAL DRILLING HANDBOOKThe larger the diameter of the drill, the greater the flow can be provided for the same inlet pressure due to wider coolant channels, and this can be seen in the diagram beloP Dc3 Dc2 Dc1QDc1>Dc2>Dc3 hence k3>k2>k1Where:Q = Volumetric flow rateP = PressureDc = Drill diameterk = Hydraulic resistance of each toolPressure RangesUp to 20 bar %u2013 Low pressure (LP)20 - 70 bar %u2013 Medium pressure (MP) 70 %u2013 200 bar %u2013 High pressure (HP) Above 200 bar %u2013 Ultra high pressure (UHP)ISCAR Knows How To Adapt Its Tools To All Possibsle Types Of coolant
