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# How do you calculate expansion vessel size?

## How do you calculate expansion vessel size?

Expansion vessels are pre-charged with air that pushes down on a diaphragm, in turn, water enters the vessel on the other side of the diaphragm and begins to compress the air….

System Volume (L) Expansion Vessel Size (L) Boiler Output (kW)
1000 100 83
1500 140 125
2000 200 167
3000 250 250

### How do you calculate expansion tank capacity?

Sizing an Expansion Tank Careful calculation of the expansion tank size is critical to the correct functioning of the system. Calculate the expansion coefficient for your system by calculating the difference between the cold system water temperature (heating off) and the max working temperature.

How do you commission an expansion vessel?

On commissioning the expansion vessel, inflate the air side of the vessel using a hand held air pump or compressor to the desired operating pressure. It is recommended that the operating pressure should be set to 0.2 bar (around 3 psi) below the cut-off point for the pump.

How do I calculate central heating volume?

Tank diameter mm x Tank length mm x Tank height mm = tank volume in litres. (Radius of tank mm2 x 3.14) x height of tank mm = tank volume in litres.

## What size potable expansion vessel do I need?

Potable Expansion Vessel Sizing Guide

Cylinder Size Expansion Vessel Size
50-80 Litres 8 Litre
90-125 Litres 12 Litre
150-180 Litres 18/19 Litre
210-250 Litres 24/25 Litre

### What pressure should my expansion tank be set at?

The recommended water pressure is between 50 and 60 PSI. Thermal Expansion Tanks contain an air bladder which is pressurized with air, and expands and contracts to absorb the expanded water from the water heater. needed. Check the air pressure in the Expansion Tank using a tire gauge.

How much pressure should be in a boiler expansion tank?

Expansion tanks are pre-charged with a 40 PSI air charge. If the inlet water pressure is higher than 40 PSI,the expansion tank’s air pressure must be adjusted to match that pressure but must not be higher than 80 PSI.

How many Litres is central heating?

Useful conversion factors:

Systems comprising perimeter heating, convectors, etc. 6 litres/kW
Ventilation systems (air handling units, fan coils, etc.) 8 litres/kW