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Let’s say in in this case your system capacity is 100 gallons. That means you’d need an expansion tank to hold an additional 13 gallons because based on the formula above, your volume has increased to 113 gallons.

First you need to know the Delta T. In this case, it’s basically the difference between your starting temperature and your desired system temperature. Multiply that by the fluid’s coefficient of thermal expansion.

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One more thing to keep in mind when sizing your tank: as a rule of thumb, it should typically be 1/3 full when cold and about 1/2 full when hot.

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So if you’re heating the fluid from an ambient temperature of 70°F to 300°F, the Delta T would be 230. For this example we’ll use Duratherm 450’s thermal expansion rate of 0.0564%/F. So the formula would basically look like this:

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Fluids expand when they’re heated, and all heat transfer systems need to account for this. Expansion tanks do just as their name suggests – they give that expanded fluid a place to go. But how do you determine the correct size for the tank?

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