February 2018

Columns

Reliability: Include pump wear rings in your upgrade efforts

Most centrifugal pump designs include replaceable rotating wear rings on the impeller (impeller wear rings) and stationary wear rings inside the casing (case wear rings). Although pump wear rings are simple components, they can have profound impacts on pump reliability, efficiency and safety. These wear rings serve three purposes:

Bloch, Heinz P., Hydrocarbon Processing Staff

Most centrifugal pump designs include replaceable rotating wear rings on the impeller (impeller wear rings) and stationary wear rings inside the casing (case wear rings). Although pump wear rings are simple components, they can have profound impacts on pump reliability, efficiency and safety. These wear rings serve three purposes: Create the contact area between rotating and stationary parts inside the pump Reduce internal recirculation from pump discharge to pump suction, or between pump stages Create hydraulic forces that stabilize the pump rotor. As wear ring running clearances increase with time, a wear-related change can affect pump efficiency, rotor stability and bearing temperature

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