Jim Elsey June 2018
Pumps are stupid. A centrifugal pump is simply a machine, where for a given set of fluid properties, impeller geometry and operating speed it will react to the system in which it is installed.
Jeff Sines June 2018
Since the motor performance defines the amount of shaft power developed as a function of shaft speed, the pump’s power curve is the motor’s power curve.
Ray Hardee May 2018
In this column, we will look at ways to measure the flow rate within a piping system without the expense of the custody transfer meters or the complexity of a flow control loop.
Jim Elsey May 2018
Non-Newtonian fluids dilating and thixotropic fluids and are more challenging to pump.
Jim Elsey April 2018
Calculating NPSHr and NPSHa can prevent the pumped fluid's pressure dropping below its vapor pressure and causing cavitation.
Ray Hardee April 2018
Proper pipeline sizing helps pump water faster, more economically and more efficiently, which ultimately extends the life of the pump and improves the entire operation.
Jim Elsey February 2018
In addition to my monthly column “Common Pumping Mistakes” the Pumps & Systems editors have asked me to write an article on the common ways that the systems can also reach out and bite you.
Ray Hardee January 2018
Last month, we discussed how a constant volume heating, ventilation and air conditioning (HVAC) system would continually pump the same flow rate of chilled water through the entire system regardless of the cooling load.
Jim Elsey January 2018
I wrote a detailed article on minimum flow for the Pumps & Systems November 2015 issue (read it here).
Lev Nelik January 2018
A recent question I received from an engineer in the Middle East had to do with a “double control” of boiler feed pumps (BFPs) at his power plant. The system was controlled both by set position of the valves as well as variable speed drives. I was intrigued.
Jim Elsey December 2017
Entrained air is typically measured by volume at atmospheric pressure and not by weight. While not a totally inclusive list, the following are the most common reasons for air entrainment in pump systems:
Jim Elsey December 2017
Read Jim Elsey's "Most Common Reasons for Air Entrainment in Pump Systems" here.
Ray Hardee December 2017
In last month’s column (read it here), we looked at cooling water service systems with multiple hydraulic circuits used to cool equipment in industrial/process industries.
Lev Nelik December 2017
Author’s Note: My October 2017 Pumps & Systems column (read it here) on shaft deflection due to internal loads ended with a challenge to the readers to do their own calculations to
Ray Hardee November 2017
In this month’s Pumps & Systems column, we will look at how simulating a large heat transfer system balance found in many industrial plants can be used to streamline plant operations.