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

Theory Bites: Impeller Blades Underfiling

Engineering & Design
Theory Bites Impeller Underfiling

Theory Bites: Impeller Blades Underfiling

Theory bites are a collection of basic hydraulic theory and will touch upon pump design and other areas of pump industry knowledge.

Blade underfiling refers to the material removal at the Impeller Blade Trailing Edge; it is the removal of material from the underside (also backside, “non-working” side, or suction side) of an impeller vane at the inlet or the exit.

Impeller underfiling is primarily a means of establishing dimensional uniformity at the vane exit tips. Vane-to-vane uniformity, in turn, reduces variation in performance from one pump to the next.

Underfiling also “straightens” the vane outer diameter surface or “land”. Some manufacturers do not under file, except when needed after a performance test.

Underfiling is also used to increase the pump head versus flow (H-Q) performance. This can be thought of as either increasing head or increasing flow. The potential for the increasing head can be in the range of a few percent to as much as 10%.

Underfiling or overfiling may also bump up the pump efficiency a bit – usually not more than 0.5%.

Source: Randal Ferman Consulting Engineer, Vice President of Ekwestrel Corp. and WaterWorld

Read more Theory Bites!

Related Articles

Related Whitepapers

Unveil Your True Potential: An Essential Guide for Maintenance Assessments

Leading maintenance in a plant, mine, or mill takes a lot of effort. Emergency work comes in a steady stream, some are breakdowns, and other…

8-Steps to Successfully Implement a Preventive Maintenance Program

This is an overview of the implementation steps in a typical Preventive Maintenance (PM) improvement project. Most of the processes can be applied to a…

Axial Flow Check Valves for Pumps and Compressors

Pumps and compressors are essential devices used in a wide range of industrial plants and buildings. They are the power source that make it possible…

Proven Seal Technologies for CO2 Capture and Supercritical Applications

Advanced seal technologies for CCUS and sCO2 applications support energy transition initiatives Companies increasingly are prioritizing energy transition initiatives to reduce greenhouse gas emissions known…


Leave a Reply

Your email address will not be published.

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