Displacement: Calculated based on the number of liters discharged
per minute, it is related to the diameter of the hole and the
required speed of the flushing fluid from the bottom of the hole,
that is, the larger the hole diameter, the larger the required
displacement. The up-and-back speed of the flushing fluid is
required to be able to flush the cuttings and rock dust cut by the
drill bit away from the bottom of the hole in time and be carried
to the surface reliably. In geological core drilling, the upward
and backward speed is generally about 0.4~1.0 m/min.
Pressure: The pressure of the pump depends on the depth of the
borehole, the resistance of the channel through which the flushing
fluid passes, and the nature of the flushing fluid delivered. The
deeper the borehole, the greater the pipeline resistance and the
higher the pressure required.
