The prevention of Legionella growth in plumbing systems is a topic on most of our minds. As a result, plumbing industry standards are paying a …
Designing Domestic Hot Water Recirculation Systems: Part 3 Pump Control
In the last R. L. Deppmann Monday Morning Minute we selected a B&G Pump after determining flow rate and pump head. This week we look at …
Designing Domestic Hot Water Recirculation Systems: Part 2 Determining the Pumping Pressure Drop
The purpose of the domestic water recirculation system is to deliver hot water near a fixture during times when there is no draw. If someone …
Designing Domestic Hot Water Recirculation Systems: Part 1 Determining the Flow Rate
This R. L. Deppmann Monday Morning Minutes series will focus on the design of domestic hot water recirculation systems in the plumbing portion of the …
A Cost Effective Domestic Water Recirculating for smaller systems
In today’s economy there are many small office, retail, and tenant fit-out work jobs than large expansive projects. These smaller projects come with tighter budgets. Here is a tool you may not be aware exists. Bell and Gossett ECO-CIRC under sink recirculating pump available for tank type water heater as well as tank-less systems. High efficiency and lead free brass construction.
Plumbing Topic: Domestic Water Recirculation Systems Part 8
“Dual Temperature Systems and Mixing Valves” “Performance Conditions of a Mixing Valve” Last week the R L Deppmann Monday Morning Minute article examined the addition of a mixing valve. Today we will examine the re-circulation system with dual temperature requirements and answer questions about the term “Performance Conditions” mentioned in the Lawler literature.
Plumbing Topic: Domestic Water Recirculation Systems Part 7
“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.
Plumbing Topic: Domestic Water Recirculation Systems Part 6
High Rise Considerations The last article, part 5, showed an example of a high rise system with pressure reducing valves (PRVS) and the importance of the correct setting of the balance valves. The example we used showed balance valves with as much as 18 PSIG across them at a low flow. When a design starts to incorporate
Plumbing Topic: Domestic Water Recirculation Systems Part 5
High Rise Considerations The last article, part 4, showed an example of a high rise system with pressure reducing valves (PRVS) and their effect on …
Plumbing Topic: Domestic Water Recirculation Systems Part 4
The last three articles outlined pump selection in domestic water recirculation systems. In general, these systems have low flow and low head pumps. What happens in a high rise with pressure reducing valves (PRV) in the hot water supply? The pressure reducing valve introduces a fixed pressure drop which must be added to the calculations.