In the last R. L. Deppmann Monday Morning Minute we covered some thoughts on the use of code vs. non-code hot water expansion tanks. Why does the system need a thermal expansion tank? How do you size a domestic hot water thermal expansion tank? Bell & Gossett has an online selection program called ESP-Systemwize that will make the selection very easy.

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It is always valuable to understand what is going on behind the program, so let’s start with the formula used for pre-charged tanks and some basic terms.

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2010126 — Turn the screw clockwise to increase the pressure, or turn it counterclockwise to decrease the pressure. Do not be too hasty. You need to adjust the screw ...

202479 — An adjustment screw on the top of the regulator can be tightened to increase the tension on the inner spring. This reduces the water pressure as ...

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24 Apr 2022 — You have your pressure reducing valve or water feeder has a check valve in it to prevent boiler water from syphoning back into your potable ...

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Tanks are often selected using software programs such as the Bell and Gossett ESP-Systemwize selection program. Let’s look at the program.

In the next R. L. Deppmann Monday Morning Minute we will look at applying safety factors in thermal expansion tank sizing as well as troubleshooting issues.

The T-241 pressure regulator is a forward pressure regulator that controls upstream pressure fluctuations to critical points of use. The T-241's internal parts have been significantly improved for optimum purity and minimal particle shedding. The wetted elastomers have been upgraded to premium materials, and internal surfaces have been enhanced. The parts are cleaned and assembled by Asahi/America's manufacturing partner, AGRU, in their state-of-the-art Austrian facility. All wetted parts are cleaned in an automated six-phase cleaning system, then assembled and packaged in a Class 1000 cleanroom.

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Why do systems require a tank today? Years ago, plumbing systems did not have a tank. In fact, the term “thermal expansion tank” did not even exist. When a domestic hot water system is heated from a cold start it is completely filled with water. If there is no water being used when it is heated, the pressure will start to increase. Decades ago this was not a problem since the pressure would dissipate into the cold city water supply lines. Today we often use reduced pressure zone type backflow preventers on the cold water supply. These act as check valves. The net result, when there is no demand, is that the system acts like a closed hydronic system which needs an expansion tank. If there is no tank, the relief valve might open due to over-pressurization.

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The V86/186 back pressure regulator maintains adequate upstream pressure as upstream pressure reduces from branch line cycling. The V86/186 may also be used as an inline pressure relief valve. The piston spring keeps the outlet closed until the set point pressure is achieved.