Lev Nelik responds to readers' questions about calculating and estimating pipe velocity
March 2019
Columnist Lev Nelik says it is important to know when you can use a shortcut, and when to go the long way.
January 2019
Lev Nelik explains calculations from the Moody diagram.
November 2018
Consider pipe sizing and motor power requirements before picking your pump.
September 2018
Lev Nelik answers reader's question about an Israeli infrastructure water project.
July 2018
Choosing fresh water or salt water for a man-made river
May 2018
Lev Nelik explains water distribution developments in Israel.
March 2018
Dr. Nelik and other experts make recommendations for an engineer in a Middle Eastern plant.
January 2018
Casing changes cause efficiency effects.
December 2017
Pumping Prescriptions
October 2017
Pumping Prescriptions
September 2017
Pumping Prescriptions
August 2017
Pumping Prescriptions
July 2017
Pumping Prescriptions
June 2017
Pumping Prescriptions
May 2017
Pumping Prescriptions
April 2017
Pumping Prescriptions
March 2017
Pumping Prescriptions
February 2017
Pumping Prescriptions
January 2017
Pumping Prescriptions
December 2016
Pumping Prescriptions
November 2016
Pumping Prescriptions
October 2016
Pumping Prescriptions
September 2016
Pumping Prescriptions
August 2016
Pumping Prescriptions
July 2016
Pumping Prescriptions
June 2016
Pumping Prescriptions
May 2016
April 2016
March 2016
January 2016
Last of Two Parts
December 2015
First of Two Parts
November 2015
October 2015
September 2015
August 2015
July 2015
Lev Nelik answers a reader's question on thermodynamic sub-processes that are highly time dependent
June 2015
May 2015
Last of Two Parts
April 2015
First of Two Parts
March 2015
February 2015
December 2014
November 2014
September 2014
August 2014
July 2014
Last of Two Parts
May 2014
April 2014
There are many indications that end users should not use a valve for flow control—or at least not to extremes.
March 2014
November 2013
Last of Two Parts
October 2013
Last of Two Parts
September 2013
August 2013
From vertical pump rotors to bacteria, resonance has similar effects.
July 2013
Last of Two Parts
April 2013
Last of Two Parts
First of Two Parts
February 1, 2013
December 2012
September 2012
12-7-1
March 2012
February 2012
July 2008
February 2008
February 2007
Proper shaft alignment makes a difference
December 2007
June 2008
September 2008
January 2007
June 2009