Norm Hall
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January 23, 2023
We understand that the best way to determine the flow rate of an operating pump is the proper readout of gauges attached to the pump... READ MORE
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Happy New Year 2021! I pray that we all have a healthy year and see the return of normal lifestyles. This final blog in this... READ MORE
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Net Positive Suction Head (NPSH) Part 4 of 5 – Gauge Readings
Norm Hall
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December 28, 2020
The cooling tower pump calculations are completed, the project is bid, the Bell & Gossett pumps scheduled are awarded and installed. There is a noise... READ MORE
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Net Positive Suction Head (NPSH) Part 3 of 5 –NPSH Available
Norm Hall
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December 21, 2020
The available cooling tower pump NPSH or net positive suction head is a function of the pan elevation, friction, and temperature. Sometimes the combination of... READ MORE
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Net Positive Suction Head (NPSH) Part 2 of 5 –Safety Factors
Norm Hall
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December 14, 2020
The Hydraulic Institute (HI) is a global authority on pumps and pumping systems. Think of them as the ASHRAE of pump design and testing. HI,... READ MORE
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Net Positive Suction Head (NPSH) Part 1 of 5 – Terms and Definitions
Norm Hall
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December 7, 2020
One of the most misunderstood concepts in pump selection for hydronic design is the net positive suction head or NPSH. Problems with NPSH can spell... READ MORE
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This week, the R. L. Deppmann Monday Morning Minutes will explain how to show multiple speeds on a pump curve and how to determine what... READ MORE
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When there is no hydronic pump discharge balance valve, the variable frequency drive (VFD) is an important part of the balance procedure. How does the... READ MORE
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Most centrifugal pumps in heating and cooling systems have some oversizing in the head calculation. Once the HVAC hydronic system is proportionally balanced per ASHRAE... READ MORE
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Open cooling tower pumps are traditionally operated as constant speed. When balanced, the extra pump head or over-heading is throttled across the discharge balance valve... READ MORE
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