This occurs when the liquid enters the pump impeller with a rotational motion. If the swirl is in the same direction as the impeller rotation, it can reduce the pump’s head and efficiency. If it is in the opposite direction, it can cause noise, vibration, and excessive hydraulic loads on the impeller.
Poor intake design is a leading cause of pump vibration, cavitation, efficiency loss, and premature bearing/seal failure. ANSI/HI 9.8 (Hydraulic Institute Standard for Rotodynamic Pumps – Intake Design) provides the industry’s definitive guidelines to avoid these issues. It applies to centrifugal, mixed-flow, and axial-flow pumps in wet-pit, suction-bell, and can-pump configurations. ansi hi 9.8 rotodynamic pumps for pump intake design
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