Vertical Pump Repair and Upgrade Considerations

This technical report discusses the considerations for repairing and upgrading vertical pumps, which include turbine, mixed, and axial flow types classified as type VS by the Hydraulic Institute. It outlines the importance of metallurgy compatibility with pumpage to ensure adequate life and details various operational sensitivities such as alignment, cavitation, and materials compatibility. The report emphasizes the significance of maintaining true centerline compatibility between rotor and stator and the necessity of tight tolerancing standards during repairs. It also presents critical factors for upgrades, including bearing spacing, lubrication methods, and leakage management based on the pumped product. The report concludes by highlighting the benefits of implementing upgrades during repairs, such as reduced vibration and extended pump life, while stressing the need for skilled service providers to ensure proper installation and alignment.