Sulzer 4x6-16 APT 33-4C Centrifugal Pump 316SS Full Semi-Closed Impeller

The Sulzer APT 33-4C is a robust, end-suction centrifugal pump designed for demanding industrial applications, particularly in chemical processing, oil and gas, and water treatment sectors. This model features a 4x6-16 configuration, indicating a 6-inch suction port, 4-inch discharge port, and a nominal 16-inch impeller diameter, constructed from high-grade 316 stainless steel for superior corrosion resistance. The full semi-closed impeller enhances efficiency in handling fluids with moderate solids content, reducing wear and extending service life compared to open impeller designs. Key benefits include high hydraulic efficiency, reliable performance under varying loads, and compliance with ISO 5199 standards for process pumps. It offers advantages over similar products like those from Goulds or Flowserve through Sulzer's advanced sealing options and modular design, allowing easy maintenance and customization. Drawbacks may include higher initial cost and the need for precise alignment during installation. This used unit shows signs of operational wear but remains in good condition, making it ideal for cost-effective upgrades in fluid transfer systems. Applications range from pumping aggressive chemicals to slurry handling, with operational flexibility for flows up to 1000 m³/h and heads up to 100 m, depending on motor pairing.