Expansion Tank

An expansion tank is a device used in plumbing and heating systems to manage pressure changes caused by the thermal expansion of liquids, typically water or coolant, as they heat up or cool down.
It ensures the system operates safely and efficiently by accommodating the expansion of liquid when heated and contracting when cooled.

The expansion tank absorbs excess pressure and volume in a closed system, preventing damage to pipes, fittings, or equipment due to over-pressurization.

Types:

Diaphragm/Bladder Expansion Tank:

Plain Steel (Non-Bladder) Expansion Tank:

Thermal Expansion Tank:

Features:

Body – Mild Steel

Bladder – EPDM Butyl Membrane

Size – 1100 Liters to 5500 Liters

End Connection – Flange

Applications

Hydronic Heating Systems: Used in boilers to manage water expansion in closed-loop systems.

Domestic Hot Water Systems: Protects water heaters and plumbing from pressure spikes.

Cooling Systems: Found in HVAC systems to handle coolant expansion.

Industrial Systems: Used in large-scale heating or cooling setups.

How It Works

As water or coolant heats up, it expands, increasing system pressure.

The expansion tank provides a space for this excess volume to go, compressing the gas (or air) in the tank.

When the system cools, the gas pushes the liquid back into the system, maintaining stable pressure.

Key Features

Pre-Pressurized: Many tanks come pre-charged with gas to match system pressure requirements.

Materials: Typically made of steel with a rubber diaphragm or bladder for durability.

Sizing: Must be correctly sized based on system volume, temperature range, and pressure to function effectively.

Benefits

Prevents system damage from overpressure.

Extends the lifespan of pipes, valves, and equipment.

Maintains consistent system performance.

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