Generic selectors
Exact matches only
Search in title
Search in content

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

How to Transfer Hazardous Chemicals

Most chemicals are either toxic, volatile, or highly corrosive and are therefore to be handled with care. Chemicals can pollute and harm the environment and…

High-Pressure Machine Tool Coolant Pumps with Superior Handling of Abrasive Fines and Metal Particles

Compact, Seal-less Pumps Reduce Costs, Improve Cutting Performance and Boost Productivity The use of high-pressure cooling for machine tool operations has increased significantly in recent…

10 Essentials for Selecting a Double Diaphragm Pump

In almost all factories you can find at least a couple of air-operated double diaphragm pumps. Not always in the heart of the process, and…

Verderflex Dura 65 Datasheet

Verderflex Dura 65 Peristaltic Hose Pump Designed for applications such as Metering, Dosing, and Transfer duties (strong advantages on sludges, slurries and abrasives) Benefits Class-leading…


Leave a Reply

Your email address will not be published. Required fields are marked *

Sign up for our Newsletter!

Select list(s) to subscribe to

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