Description
– Modern expansion tanks feature a rubber diaphragm separating water and air.
– One side connects to heating system pipework, while the other contains pressurized air.
– Older tanks lacked diaphragms, causing air transfer and requiring periodic maintenance.
– Rubber diaphragm prevents air transfer, reducing dissolved oxygen and corrosion.
– Effective design enhances system reliability and longevity.
Domestic Applications
– Expansion tanks in domestic hot water systems must meet drinking water regulations.
– Historically, trapped air acted as an expansion buffer in plumbing systems.
– Increased installation frequency of expansion tanks in new and upgraded systems.
– Open roof tanks had risks of freezing and contamination, affecting water quality.
– Minimum pressure of 28-34 kPa (4-5 psi) is recommended for closed hydronic systems.
Automotive Applications
– Expansion tanks, or overflow bottles, are used in internal combustion engine cooling systems.
– Allowance for coolant and air expansion with temperature and pressure increases.
– Function as coolant recovery tanks, preventing loss of coolant during operation.
– Essential for maintaining optimal engine temperature and preventing overheating.
– Design ensures coolant is reused as the engine cools down.
Larger Systems
– Expansion chambers or hydrophores are utilized in large-scale pumping stations.
– Maintain consistent pressure within the system to enhance efficiency.
– Reduce effects of water hammer, protecting infrastructure from damage.
– Similar principles apply to both small and large systems for pressure management.
– Critical for the operation of municipal water supply and industrial applications.
See Also
– Hydronics: Study of water-based heating and cooling systems.
– Hydraulic accumulator: Device storing energy in the form of hydraulic fluid under pressure.
– Importance of expansion tanks in various applications.
– Design standards and regulations governing expansion tank use.
– Maintenance and installation best practices for optimal performance. https://en.wikipedia.org/wiki/Expansion_tank
