The displacement of the mud pump is calculated as several liters per minute, depending on the diameter of the borehole and the required rate of return of the rinse liquid from the bottom of the hole, ie the larger the bore, the greater the required displacement. Rinse fluid back to the speed of the bit can be cut off the drill bit, rock punches in time from the hole, and reliably carry to the surface. Geological core drilling, the general return speed of 0.4 to 1 m / min or so. The pressure of the mud pump depends on the depth of drilling, the resistance of the passage through which the rinsing fluid passes and the nature of the rinsing fluid delivered. The deeper the borehole, the greater the resistance of the pipe and the higher the pressure required. With the drilling diameter, depth changes, requiring the pump displacement can be adjusted at any time. In the pump mechanism with gearbox or hydraulic motor to adjust its speed, in order to achieve the purpose of changing the displacement.
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