Norm Hall
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July 25, 2022
Last week the article covered pressure drop correction calculations. Today we offer you some handy charts to use for second glycol correction pressure drop. Example: I have calculated the water piping pressure drop through a chilled water system to be 80 feet using the System Syzer. Question: What is the pressure drop if I have 50% Ethylene Glycol/Water with temperatures of 45°F to 55°F? Answer: The average temperature is 50°F, so my factor is 1.47. [Read more…]... READ MORE
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Question: I have selected my piping friction loss based on water, but I am pumping a glycol solution. What correction do I use? Answer: There are three glycol corrections when designing a hydronic or process cooling system; heat transfer correction, pressure drop correction, and pump curve correction. This R L Deppmann Monday Morning Minute defines the second of three glycol corrections. [Read more…]... READ MORE
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We recently received an inquiry from an engineering firm deciding whether to change their pump schedule. They currently select the pumps at design capacity and... READ MORE
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Hydronic System Pump Selection: Flat vs. Steep Curves
Norm Hall
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April 27, 2020
An engineer in Michigan called about a large project with several pumps being selected in parallel for a plant chilled water system. He commented that... READ MORE
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OK. I get it! Parallel pumping is a design technique I should review on most of my projects where first cost and energy cost are... READ MORE
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The Department of Energy (DOE) pump standards goes into effect on January 27, 2020. This affects projects you are sending out to bid right now!... READ MORE
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This being the last article in this series, I turn your attention to double suction pump efficiency. I will also share some information on pump... READ MORE
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Double Suction Pump Specification: Coupler & Bases
Norm Hall
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April 8, 2019
Today, we turn our attention to the parts of a double suction pump you can see when you walk by it; the coupler, the base,... READ MORE
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Double Suction Pump Specification: Rotating Pump Elements
Norm Hall
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April 1, 2019
We continue to examine the double suction pump specification for HVAC and hydronic systems. Your specification may have a paragraph or two about the shaft,... READ MORE
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Double Suction Pump Specification: Mechanical Seals
Norm Hall
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March 25, 2019
How do you match the mechanical seal specification of double suction pumps with the scheduled base bid manufacturer and allow other names in the spec?... READ MORE
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