When we show variable speed pump curves, we also want to show the control curve. This control curve looks very similar to a system curve …
Converting Constant Speed Pumps To Variable Speed – End Of Curve Concerns
In the R. L. Deppmann Monday Morning Minute from June 4th we offered some tips on converting an existing over-headed constant speed pumping system to a …
Bell & Gossett Part Load Efficiency Value Part 4: End-of-Curve Selections
When looking at Bell and Gossett pump selections, we often find higher part load efficiency (PLEV) pump choices are to the right of the BEP, or best …
Minimum Flow in Variable Speed Pumps for HVAC and Building Plumbing Systems
Every week a question comes in to R. L. Deppmann about the minimum flow rate through pumps. In hydronic heating and cooling systems, it is …
Centrifugal Pump Start Up
You specified the best, Bell and Gossett. The contractor purchased the best, Bell and Gossett. Now how do you make sure it is operating the best! Once a B&G base mounted centrifugal pump is installed in your hydronic system we recommend it be commissioned with a specified check, test, and start-up service. This service, when performed by
Constant Speed Pumps and Maximum Impeller Concerns
How many times have you, as an engineer, looked at a number of curves and passed up a few because you did not like something about the selection on that curve? In the last R. L. Deppmann Monday Morning Minute we looked at end of curve selections. Today we examine pump selections near the top of the…
Centrifugal Pump Selection Maximum Point on the Curve
How many times have you, as an engineer, looked at a number of curves and passed up a few because you did not like something about the selection point on that curve? In the December 6, 2010 R. L. Deppmann Monday Morning Minutes, we look at how to specify and schedule pumps to limit the bidders to to specific pump curve characteristics.
- Page 2 of 2
- 1
- 2