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 The standard diaphragms used on expansion tanks for the traditional hydronic
applications are neoprene. These are quickly destroyed by all non-freezing solar
fluids currently in use. Glycols should use an EPDM or Hydrin diaphragm, and both
types of oils must use one made of Hydrin. Galvanized tanks should never be used
with glycols.
Expansion tank sizing, combined with calculations of the appropriate system fill
pressure, are very important with closed-loop systems. Undersized tanks or
incorrect fill pressures usually result in a loss of system fluid, followed by other
negative consequences.
FIGURE 2-34
An Expansion Tank
Without a Diaphragm
as Fluid Pressure
Increases
FIGURE 2-35
An Expansion Tank
With a Diaphragm
as Fluid Pressure
Increases
OPERATION
2.7 COMPONENT OPERATION
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