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Membrane expansion tanks have nipple apertures which serve for regulating and monitoring of pressure's values in
the gas part of the vessel. After you define the initial pressure, it is necessary to measure the pressure in the gas part of the
tank (for instance; by the car pressure gauge) and then release or add (for instance; by the car pump) the air up to the set
pressure value. Simultaneously you should consider that for the boilers "BaltGaz NEVALUX" the initial pressure in the
expansion tank should be at least 0,1 MPа and not more than 0,3 MPа.
Lower pressure can cause the boiler's operating failure.
To calculate the full volume of the expansion tank you can use the following formula:
Vc =1,099*Vi*Av*(Рmах +0,1) / (Рmах – Р),
where:
Vi – full volume of heating system in litres;
Av – growth of water volume in the heating system from the expansion at heating up to the maximal possible
temperature;
Рmах=0,3 MPа – maximal calculated pressure in the expansion tank (equals to the pressure of the safety valve
activation);
Р – initial pressure in the expansion tank (calculated according to the above mentioned method).
Heating system volume (l)
Expansion tank full volume (L)
User's and technical staff manual
Starting pressure in the expansion tank
57
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