A collection of observations and information from 50 years of engineering experience

Articles

Chart of pump phenomena and minimum flows

What is the Purpose of Minimum Flow?

Randal Ferman

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...

52 comments

What is the Purpose of Minimum Flow?

Randal Ferman

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...

52 comments
Hydrodynamics of Pumps, 2011

Hydrodynamics of Pumps (2011 edition) – A Book ...

Randal Ferman

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...

2 comments

Hydrodynamics of Pumps (2011 edition) – A Book ...

Randal Ferman

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...

2 comments
Diffuser

Diffuser versus volute

Randal Ferman

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...

19 comments

Diffuser versus volute

Randal Ferman

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...

19 comments
Turbine-Driven Mainline Pump: by Randal Ferman, Ekwestrel Corp

Pump Handbook Fourth Edition – A Book Review

Randal Ferman

Years ago I owned a copy of Pump Handbook 1st Edition, by Karassik, Krutzsch, Fraser, and Messina. While it was a book to have on the shelf, it was not...

5 comments

Pump Handbook Fourth Edition – A Book Review

Randal Ferman

Years ago I owned a copy of Pump Handbook 1st Edition, by Karassik, Krutzsch, Fraser, and Messina. While it was a book to have on the shelf, it was not...

5 comments
floral-statue-in-Korea

Korea - A Year In Review

Randal Ferman

This year I’ve visited South Korea (Korea) five times. The destination has always been Changwon City so most of my experience and observations of Korea relate to that locale. view...

1 comment

Korea - A Year In Review

Randal Ferman

This year I’ve visited South Korea (Korea) five times. The destination has always been Changwon City so most of my experience and observations of Korea relate to that locale. view...

1 comment

Beyond expectation

Randal Ferman

Wednesday, the day before Thanksgiving, I was out shopping and stopped in at REI, an outdoor gear and clothing store. I stepped over to the watch display case thinking I...

Beyond expectation

Randal Ferman

Wednesday, the day before Thanksgiving, I was out shopping and stopped in at REI, an outdoor gear and clothing store. I stepped over to the watch display case thinking I...