The pump discharge is the most turbulent location in a hydronic system. There are simple rules to follow when piping up a pump discharge. Today, …
Hydronic Centrifugal Pumps – Closed System Suction Piping
The piping at the suction side of the pump is the most important and, for some engineers and designers, the most misunderstood part of hydronic …
Primary Secondary Piping Basics: Part 1 – Terms
The basic design concepts of piping are important for a properly operating hydronic heating or cooling system. We have a great number of new engineers, …
Primary-Secondary CHW Loops with Unequal Flow Rates
Primary-secondary hydronic system loops have a common pipe that facilitates flow in both directions when the two loops have different flow rates. That same common …
Pumping From an Atmospheric Tank: Pump and Tank Control (Part 3)
Let me start by wishing everyone a Happy and Prosperous New Year. This blog begins the 14th year of the R. L. Deppmann Monday Morning …
Pumping from an Atmospheric Tank: Pump and Tank Piping (Part 2)
What can be simpler than pumping water from an open or atmospheric tank into another tank or system? What seems simple to many opens a …
Heat Pump Water Heaters: Temperatures & Storage (Part 4)
Commercial heat pump water heaters using R-744 (CO2) refrigerant operate best when attention is paid to the piping and storage tank arrangement. Today, in part …
Condensing Boiler Venting Material (Part 1)
Proper venting of hydronic condensing boilers is critical for the safety of occupants and the successful operation of the heating plant. The materials that may …
Hydronic Pump Piping and Trim: Pump Suction Energy Levels
I frown a bit when reading about a product and the only place you find a key tip to avoiding problems is in the troubleshooting …
Where Cavitation Begins – Cooling Tower Pumps and Piping
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.