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What is Thermal Expansion?
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Thermal expansion of water in a closed plumbing system can
create a number of annoying and potentially dangerous
problems. These include: the build up of unusually high
pressure in a system (even when a pressure reducing valve is
installed); pressure surges; and the chronic or continuous
dripping of a temperature and pressure (T&P) relief valve. In
addition, dripping faucets and leaking toilet tank ball cock
fill valves are also symptomatic of thermal expansion.
More serious problems can also occur due to thermal
expansion. When dangerous pressures are built up in a water
heater, internal parts may fail such as the internal flues,
fittings or water connections. If a flue way collapses it can
lead to the potential release of toxic gases, such as carbon
monoxide into living spaces. Thermal expansion can also
lead to a ruptured or distorted hot water heating tank and
may void the manufacturer’s warranty .
Georgia plumbing code requires a thermal expansion tank on all
closed plumbing systems as well as when the temperature and
pressure relief valve discharge piping run vertically.
create a number of annoying and potentially dangerous
problems. These include: the build up of unusually high
pressure in a system (even when a pressure reducing valve is
installed); pressure surges; and the chronic or continuous
dripping of a temperature and pressure (T&P) relief valve. In
addition, dripping faucets and leaking toilet tank ball cock
fill valves are also symptomatic of thermal expansion.
More serious problems can also occur due to thermal
expansion. When dangerous pressures are built up in a water
heater, internal parts may fail such as the internal flues,
fittings or water connections. If a flue way collapses it can
lead to the potential release of toxic gases, such as carbon
monoxide into living spaces. Thermal expansion can also
lead to a ruptured or distorted hot water heating tank and
may void the manufacturer’s warranty .
Georgia plumbing code requires a thermal expansion tank on all
closed plumbing systems as well as when the temperature and
pressure relief valve discharge piping run vertically.
When water is heated it expands. . This is because when water is heated, its density
decreases and its volume
expands (see below)
decreases and its volume
expands (see below)
