Triplex Mud Pump A triplex mud pump is a type of positive displacement pump that uses three plungers or pistons to move fluid. This type of pump is widely used for drilling rigs because of the following reasons. First, high pressure capabilities. Triplex pumps can generate a significant amount of pressure which is essential for various tasks during drilling. This pressure is needed to push drilling mud down the drill string and back up through the wellbore annulus. Second, efficiency and flow co