■ Hydronics Supplement
Make sure to use all of the resources available if unsure on how to properly size an expansion tank. Manufacturers, manufacturers’ representatives, and wholesalers are all good places to start.
Slightly oversizing an expansion tank isn’t necessarily a problem and many consider it “good insurance.” By Roy Collver 22
Plumbing & HVAC – July/August 2021
Water expands when it is heated. Inside of a closed container or piping system, the internal pressure will increase rapidly because water is incompressible in real-world conditions. My first illustration gives one pause to consider the effect on hydronic system components if water volume increase is not accounted for. The need to add a pressure safety relief valve to any closed-loop piping system is clear from this chart.
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