Plumbing Topic: Domestic Water Recirculation Systems Part 7

Norm HallPlumbing System Design, Domestic Water Recirculation, Mixing Valves, Monday Morning Minutes

“Addition of a Mixing Valve” During the last 6 weeks, the R. L. Deppmann Monday Morning Minutes concentrated on re-circulation systems where the supply temperature to the system was the same as the outlet temperature of the water heater. Today we will examine the addition of a Lawler master mixing valve in the system.

Double Wall Plate Heat Exchangers

Norm HallMonday Morning Minutes, Heat Exchangers, Plate Type, Plumbing System Design, Double Wall, Heat Exchangers, Double Wall

The Monday Morning Minutes of the last two weeks introduced some differences between plate heat exchangers. Two of the products featured were the double wall plate & frame and double wall brazed plate heat exchangers. We have received many calls regarding these models and Michigan and Ohio plumbing codes. The plumbing code is very specific in its

Centrifugal Pumps and Pump Curves for HVAC and Plumbing Systems

Norm HallMonday Morning Minutes, Pumps, Selection and Specification, Curves

Centrifugal pumps are the “heart” of hydronic heating, cooling, and plumbing systems. Over the next few weeks, the R. L. Deppmann Monday Morning Minutes features some basic and advanced pumping topics. Let’s start with a quick review of the information contained on the pump curve. For our example, we will use an ITT Bell and Gossett model 1510 end suction base mounted centrifugal pump model 5E with a nominal speed of 1750 RPM. The horizontal axis is flow rate in GPM or gallons per minute of water. [Read more…]