Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors
White Papers

Discharge Recirculation

Discharge recirculation occurs when a pump is operating significantly away from its best efficiency point (BEP).

The BEP is the operating point at which the angle of the flow most closely matches the impeller and diffuser/volute vane geometry. The close correspondence of the fluid angle and fixed vane angle at this point produces the least possible losses incurred throughout the pump operating range, resulting in maximum pump efficiency. The farther that the pump operates from the BEP, the greater the mismatch between the flow angle and the fixed geometry vane angles. This mismatch results not only in increasing shock losses that reduce pump efficiency, but also many other detrimental effects on pump health; these effects are all caused by an increasing susceptibility of the flow to internal recirculation.

Discharge recirculation occurs at the outlet of the impeller and is related to the angle of the exiting fluid. In this condition, there is a mismatch between the angle of the flow exiting the impeller and the inlet angle of either the volute cutwater or diffuser vanes. Recirculation becomes more severe when the divergence is more significant.


Please fill out the following form to access this premium content

Privacy Policy:
Empowering Pumps & Equipment is committed to protecting and respecting your privacy, and we’ll only use your personal information to administer your account and to provide the products and services you requested from us and/or our partner. We may also send you our eNewsletter, of which you can unsubscribe and/or customize in your email preferences. By providing your information including email and clicking the button below, I agree to the Terms and Conditions and Privacy Policy, provide my electronic signature, and consent to receive the product/service requested. Consent is not a condition of any purchase. You may opt out any time.


Join the #PumpTalk Community

By submitting this form, you are consenting to receive marketing emails from: Empowering Pumps & Equipment, 2205-C 7th Street, Tuscaloosa, AL, 35401, You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact