Plumbing Topic: Domestic Water Recirculation Systems Part 6

Norm HallHigh Rise Systems, Monday Morning Minutes, Plumbing System Design, Domestic Water Recirculation, Balancing

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 4

Norm HallMonday Morning Minutes, Pumps, Plumbing System Design, Domestic Water Recirculation, Balancing

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.