Which method can be used to reverse pump rotation?

Switching the motor electrical leads is the method that effectively reverses pump rotation. In many types of electric motors, especially three-phase motors commonly used in pumps, the direction of rotation is determined by the sequence of the electrical phases. By interchanging any two of the three power leads, the phase sequence is altered, which directly changes the rotation direction of the motor. Hence, the pump connected to that motor will also reverse its rotation.

While changing pump alignment, adjusting motor speed settings, or repositioning the suction line can impact pump performance, they do not influence the rotational direction of the pump. Proper alignment is crucial for operational efficiency and to prevent wear or damage but does not affect rotation. Similarly, changing the speed setting might influence the flow rate or pressure of the pumped fluid but does not cause the pump to change its rotational direction. Repositioning the suction line might address other issues like cavitation or blockage, but does not impact rotation either. Therefore, switching the motor electrical leads is the clear and effective method for reversing pump rotation.