Upside-down glass of water

Suction – It’s Not What You Think It Is

Suction is often defined as a force that causes a fluid or a mixture to be drawn into an interior space. Some dictionaries more accurately define suction as a force or condition produced by a difference of pressures.  Both definitions are correct. However, the first tends to support the illusion

critical pump selection three major issues webinar video

Critical Pump Selection Webinar – Video

After the success of my webinar, I am making a recording of it available for everyone who was not able to attend, and those who wanted more time to go over the material and illustrations. Thanks again to everyone who attended the live webinar! If you want to hear about future webinars, subscribe now

Chart of pump phenomena and minimum flows

What is the Purpose of Minimum Flow?

Over the years use of the term “minimum flow” has evolved.   Decades ago industrial centrifugal pump manufacturers quoted a single, relatively low value for minimum flow intended to prevent users from running their pumps to destruction.  The term “minimum flow” generally meant the lowest continuous

Hydrodynamics of Pumps, 2011

Hydrodynamics of Pumps (2011 edition) – A Book Review

Hydrodynamics of Pumps by Christopher E. Brennen was first published in 1994.  Aside from my long-time professional acquaintance with the author, what caught my attention in this book are the various technical passages related to rocket propulsion turbomachines, including the Space Shuttle Main


Diffuser versus volute

The stator section of a centrifugal pump, after flow exits the impeller, is usually either a ‘diffuser’ or a ‘volute’. The purpose of each of these two stator types is to efficiently diffuse velocity energy into pressure. Diffusers are characterized by a plurality of radially symmetric diffusing