Spherical Expansion Tanks
A spherical expansion tank is a compact pressure tank whose membrane, inside a spherical steel shell, absorbs thermal expansion of water or pump start-ups.
It is used on combi boilers and small heating circuits, single-pump booster sets and installations with limited space. The product range includes 24 L PN10 spherical tanks.
Main Applications
- Combi boilers and small heating circuits
- Single-pump booster sets
- Apartment water systems
- Small solar circuits
- Boiler rooms with limited space
Technical Data
| Tank type | Spherical membrane expansion tank |
|---|---|
| Volume | 24 L (product range) |
| Pressure class | PN10 (product name) |
| Shell | Steel, electrostatic powder coat |
| Membrane | EPDM (depending on model) |
| Maximum tank temperature | +110 °C (+70 °C for domestic water), by series |
| Connection | G thread, ISO 228-1 (depending on model) |
| Pre-charge | Factory setting depending on model; adjusted on site |
| Fluid | Water, water with up to 50% glycol |
| Standard | EN 13831 (by series) |
Material Options
| Part | Heating type (red) | Booster / domestic water type (blue) |
|---|---|---|
| Shell | Steel, powder coated | Steel, powder coated |
| Membrane | EPDM | EPDM or butyl (depending on model) |
| Gas cushion | Dry air | Dry air or nitrogen |
| Water connection | G thread | G thread |
Which material? Spherical tanks are supplied with different colours and membranes for heating and booster use; for domestic water a type suited to drinking water must be chosen. Temperature and standard values come from the expansion tank manufacturer sheet.
Advantages
Compact
- Fits tight spaces
Wall Mounting
- Can be hung with a bracket (depending on model)
Adjustable Pre-Charge
- Set on site
Membrane Type
- Hygienic operation
Construction and Design Features
- Spherical steel shell
- Internal membrane
- Water connection
- Pre-charge valve
Send the system type, volume and pre-charge; we will confirm a suitable spherical expansion tank from stock.
How to Choose?
- Calculate the volumeChoose tank litres from system water volume and temperature difference.
- Choose the pressure classSet the PN for the system pressure.
- Fluid and temperatureState heating or domestic water.
- Set the pre-chargeAdjust the pre-charge to the system before installation.
Complementary Products
Why ORFA?
Other Expansion Tanks
Vertical Expansion Tanks
Vertical expansion tanks are floor-standing diaphragm tanks that absorb the thermal expansion of water in closed heating, cooling and booster systems.
Details →
Expansion Tank Membranes
Expansion tank membranes are replaceable rubber spare parts that separate the water from the pressurized air inside the tank.
Details →
Horizontal Expansion Tanks
Horizontal expansion tanks are diaphragm tanks installed horizontally where height is limited, absorbing thermal expansion in closed systems.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.