We often design system after system and designate the sizing of expansion tanks to the newest employee on the team. It is just a matter …
Hydronic Expansion Tanks: Have I Ever Pumped into the Point of No Pressure Change?
There is a constant flow of hydronic system design questions coming into R. L. Deppmann Company. Sometimes the questions are about complicated hydronic, steam, or …
SCCR and Interrupting Capacity in Packaged HVAC and Pumping Equipment
Recently, we received several requests for the “short circuit current rating” or SCCR of a packaged piece of equipment. We also received requests for the …
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 …
Analog Control Signals Used In HVAC Systems
Back in the old days of building automation systems, most things were controlled using compressed air. This method was called pneumatics and it consisted of …
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 …
R.L. Deppmann Company Now Represents PVI Water Heaters in Michigan and Ohio
R.L. Deppmann Company is pleased to announce that we now represent PVI Water Heaters in both Michigan and Ohio. For almost 60 years, PVI has …
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 …
What Is A Steam Condensate Return Unit And How Is It Sized?
We normally do not use steam for comfort heating when designing a system today. Other than old steam heating systems, we use steam for building …