I recently received an email from an engineer discussing the type and location of balance valves in a domestic hot water recirculation system. He brought …
Small Domestic Water Recirculation Pumps: Is it Time to Break a Habit?
Most domestic hot water recirculation pumps are very small. R.L. Deppmann is thankful that most engineers schedule a Bell & Gossett PL-30B or 36B maintenance-free …
Hydronic Expansion Tanks: Can I Pump into the Point of No Pressure Change (PNPC) to Reduce the Tank Size? (Part 3 of 3)
Can we pump into the point of no pressure change in a closed hydronic system? We gathered feedback on the proposed system by a local …
Join XYLEM, Bell & Gossett and R. L. Deppmann in Helping Houston Victims: Donation Match Opportunity
Xylem, the parent company of Bell & Gossett, has a corporate social responsibility program brand they call “Watermark.” This month they announced a program to …
Hydronic Expansion Tanks: Can I Pump into the Point of No Pressure Change (PNPC) to Reduce the Tank Size? (Part 2 of 3)
We are gathering input from the last R. L. Deppmann Monday Morning Minutes asking for your feedback on the potential to “not follow the rules.” …
Hydronic Expansion Tanks: Can I Pump into the Point of No Pressure Change (PNPC) to Reduce the Tank Size? (Part 1 of 3)
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 …