[Continuation from last week’s MMM] Let’s assume we have a SIX story health care building and the heating system is 90 feet high with a 180 degree supply temperature. The pump and boilers are on the first floor. The BRYAN boilers selected come with 125 PSIG relief valves. Let’s also assume that the pump has a capacity of 800 GPM at 100 feet at design.
Maximum Pressure of Expansion and Compression Tanks – Part 5
Maximum pressure in a hydronic system depends on a number of variables. Last week we used an example to introduce the maximum pressure at the expansion tank. Let’s look at a couple more examples. EXAMPLE TWO: Figure 1 shows a one line diagram of a heating system with a boiler and pumping system.
Cold Fill Pressure – Expansion and Compression Tanks – Part 4
Cold fill pressure is defined as the initial pressure required to lift water from the point of the gauge readout to the top of the system plus 4 PSIG for positive venting. This statement holds true for systems from chilled water to heating systems up to 220°F. From 220°F to 250°F, consult the Bell and Gossett Air Management training manual, available from R L Deppmann Company, serving Michigan and Ohio, or from your local B&G representative for other parts of the globe.
Acceptance Volume of Expansion and Compression Tanks – Part 3
In part 2 of the R L Deppmann Monday Morning Minutes we determined the initial and final temperatures of the hydronic system in order to calculate the expansion tank selection. When we heat the water in a hydronic system, the water expands. This expansion is expressed as Ew in the formula: Ew – Ep = The expansion of the water minus the expansion of the pipe.
Expansion and Compression Tanks Formulas – Part 2
Last week the Monday Morning Minute introduced the expansion and compression tank formula. We described the numerator as the tank acceptance. The formula is (Ef – Ep) X Vs where Vs is the system volume and (Ef – Ep) is the expansion of the fluid minus the expansion of pipe. Let’s review some of the required data.
Expansion and Compression Tanks Series – Part 1
We could entitle the next dozen weeks as: TANKS-A-LOT. (Sorry). Over the next few months, the Monday Morning Minutes blog will examine expansion and compression tank sizing. We will also tackle some more advanced issues in the selection and troubleshooting of closed system expansion tanks. Tanks are often selected using software programs such as the Bell and Gossett ESP-Plus™ selection program.
Griswold Chemical Pot Feeders Part Deux
The Clothing They Wear. Chemical feeders or “Pot-feeders” want to be fashionable too. Specifying a chemical feeder without a detail is like telling your son he should wear a suit to a special dinner. You assume he will wear socks and shoes, but can you be sure that he will?
Griswold Chemical Pot Feeders
“An old friend with several new twists” Chemical feeders or “Pot-feeders” have adorned mechanical equipment rooms for decades. R.L. Deppmann appreciates the specification and purchase of the Griswold 2 and 5 gallon feeders. Today, I’ll present a couple of the benefits both owners and installing contractors may enjoy when using the Griswold Feeders.
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.