The issue of supporting a tank or pressure vessel is generally not an issue except where the tank is in an outdoor environment, or where it is subject to colder temperatures.  For large and tall domestic cold water tanks. the older inlet water will sink to the bottom where it stratifies in temperature gradients.  The coldest water at the bottom then condenses area moisture that migrates between the base of the tank and supports.

The strength of expanding rust is so great that we have documented it to have raised a 35,000 gallon steel house tank 3/4 in. above its I beam supports, placing noticeable stress against every piping connection.  In addition, the bottom to most larger rectangular water storage tanks is rarely painted – leaving this hidden space far more vulnerable to corrosion.

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