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The axial and radial loads placed on the impeller have an important effect on the reliable operation of a pump. Since the impeller is rigidly connected to the rotor bearings if these loads become too large the excessive bearing heat and shortened life may be experienced. Typically the pump is designed so that these loads are minimized, but some amount…

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Enclosed and semi-open impellers are both widely used in centrifugal pump design. While enclosed impellers are typically considered more efficient, both designs have merits and are suited for different applications. In this discussion, we will be addressing single-inlet impellers, which are typically used for end-suction style pumps. Semi-Open vs Enclosed Impellers:  Flow Enclosed impeller sandwich vanes between a front and…

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One of the most critical systems on ships is the cooling system. Large vessels need a way to safely remove unusable heat from their main engine, auxiliary engines, generators, and other machinery. At the heart of every ship’s cooling system are the marine cooling pumps. These pumps are responsible for bringing water to every component in the engine room and…

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Industrial vertical sump pumps are designed for moving water and other liquids from deep pits. Sometimes called immersion pumps due to the fact that the pump casing is immersed in the fluid, their accommodating design makes them incredibly useful in a variety of applications. Of the numerous sump pumps available, the Pentair Aurora 531 column pump was well known in…

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