Small Drawing of Header Supply and Return
Small Drawing of Header Supply and Return

Parallel Pumping with Unequal Condensers (Part 4)

Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants Commissioning and Balance, Cooling Towers, Cooling Towers, Hydronic System Design, Monday Morning Minutes, Parallel Pumping, Parallel Pumping, Piping and Pumps, Pumps, Selection and Specification

Over the last few weeks our Monday Morning Minutes posts have looked at pumping issues with parallel, equal-sized condensers and pumps. This week we will look …

Where Cavitation Begins – Cooling Tower Pumps and Piping

Norm Hall Cooling, Cooling Towers, Cooling Towers, Cooling Towers, Hydronic System Design, Monday Morning Minutes, Piping and Pumps, Pumps

Last week the R. L. Deppmann Monday Morning Minute defined NPSHR, and ended with the Hydraulic Institute (HI) definition as the absolute pressure that will cause the total head of the pump to be reduced by 3%, due to flow blockage from cavitation”. Of importance is the fact that it does not say that NPSHR is where cavitation begins.

Differences in Compression Tank and Expansion Tank Formula – Part 9

Norm Hall Expansion and Compression Tanks, Expansion/Compression Tanks, Hydronic System Design, Monday Morning Minutes, Tanks

Now we understand the difference between expansion and compression tanks as described in the R. L. Deppmann Monday Morning Minutes of 1-9-12 and 1-16-12. What happens to the formula results when comparing these two types of tanks? In part 1 of this series, we introduced the formula for tank sizing. The denominator of the equation was: (Pa /Pf) – (Pa /Po)