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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AMTROLExpansion Tank SizingChart

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It is recommended that an ECV be fitted to the cold water supply line. This will relieve cold water, not hot water, during the heating cycle, saving energy and increasing the life of the PTR. Some local governments make it mandatory to install an ECV in the cold water line. PTR and ECV valves are safety valves and should be replaced every 4 years. High pressure may cause excessive discharge and possible premature failure of the operating relief valve (see table). The maximum water pressure usually occurs during the night, at the time of lowest water usage. In any mains pressure water heater installation if the water pressure exceeds 80% of the nominal set pressure of the operating relief valve, a Pressure Limiting Valve must be fitted to the cold inlet. If a cold water expansion control valve is fitted it will have a lower set pressure than the AVG Pressure and Temperature Relief Valve and therefore will be the main operating relief valve.

Expansion tank sizingChart

The AVG pressure and temperature relief valve is designed to relieve the increase in pressure caused by water expansion during the normal heating cycle. The PTR valve will then relieve the increase in pressure by releasing drips of hot water to the drain line. Should the electrical temperature cut-out device cease to operate correctly, the water will overheat. The temperature probe will then open the PTR valve and discharge hot water to the drain line.

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Expansion tank sizingrule of thumb

Each valve is individually tested and calibrated to ensure that it meets the correct pressure specifications. AVG Pressure and Temperature Relief Valve is designed and manufactured to meet Australian Standard AS1357.1, under Licence No. 2639 and meets AS4020, Drinkable Water Standard. Manufactured under Quality Assurance ISO 9001 and ISO 9002 (UK). Suitable for either horizontal or vertical installations. The valve is designed to automatically reseat after each action.

AMTROLexpansion tank Sizingpdf

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.

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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Expansion tank sizingcalculator

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Chilledwater expansion tank sizing

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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.

How to calculateexpansion tanksize for chilledwatersystem

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

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