Decarbonization and Electrification are two terms which may bring both fear and hope to plumbing engineers and gas fired water heater manufacturers. The hope is …
Solving Minimum Flow in a Primary Variable System (Part 3)
The engineer is aware of the importance of minimum flow to the pumps in hydronic systems. The R. L. Deppmann Monday Morning Minutes Part 1 …
Minimum Flow in Variable Speed Pumps for Building Hydronic HVAC Systems (Part 2)
The HVAC engineer designing a hydronic system understands the need to protect the circulating pumps from a dead head or no flow condition. This week, …
Minimum Flow in Variable Speed Pumps for Building Hydronic HVAC Systems (Part 1)
Every week a question comes into R. L. Deppmann about the minimum flow rate through hydronic pumps and the best way to achieve it. Today, …
Steam Condensate Return Transfer Pump Inlet
One of our many new employees asked a valid question about cast iron condensate unit pump construction. The employee has worked in the HVAC plumbing …
Variable Speed Chilled Water Systems: Demand Reset
There are multiple methods to vary pump speed in HVAC chilled water systems. A common method is the use of a differential pressure transmitter at …
Boiler Feed Unit: Pump Minimum Flow
Maintaining the required minimum flow in centrifugal pumps is key to trouble free expectations and long life. In boiler feed applications, this minimum flow is …
Boiler Feed Unit Pump Control is All About the Number of Pumps and Boilers
When selecting and specifying a steam boiler feed unit or deaerator, the engineer must pay attention to the controls. Level controls at the boilers must …
Vented Boiler Feed Units & Pressurized Deaerator Boiler Feed Units, What is the Difference?
Some systems have deaerator boiler feed systems, and some have vented boiler feed systems. What is the difference between them? When should I use one …
What is a Steam Boiler Feed Unit and How is the Receiver Sized?
Once again, our industry tends to be clear when something is named. Just reverse the two words. Boiler feed units simply “feed the boiler.” The …