Pressure adjustment in the hydropneumatic tank

Before connecting the pressure tank to the water supply system, initial pressure in the gas space must be created.

In an empty hydropneumatic tank with a pre-set gas space pressure Pг, the entire volume of the tank is occupied by air (nitrogen gas).

Once the pump is turned on, the system is filled with water and, as soon as the water pressure exceeds the initial gas space pressure, water stretches the membrane and compresses the gas, entering the hydropneumatic tank, and when the minimum operating pressure Pmin for the water supply system is reached, it will fill it by 10-15%.

15% of the water reserve in the hydropneumatic tank is necessary to cover the water consumption during the time it takes from the moment the pump is turned on to the moment water arrives from the pump to the distribution faucet. In the absence of this reserve, an unstable consumption mode may occur with interruptions at the moment when all the water has been displaced from the hydropneumatic tank, but the pump has not yet turned on.

Initial gas space pressure is calculated for specific operating conditions. The pressure in the hydropneumatic tank can be calculated on the [Calculations] page of our website. If the initial gas space pressure of the hydropneumatic tank, set at the factory, exceeds the calculated value, it needs to be lowered by releasing air, and if it is lower, the pressure must be increased with a pump.

The initial gas space pressure is accepted to be 0.2 - 1 bar less than the pump's switching pressure. The further the hydropneumatic tank is installed from the point maintaining constant pressure, the lower the initial gas pressure should be accepted.

On the [Calculations] page, there is a program that will help you determine all the parameters necessary for pressure adjustment in the hydropneumatic tank: initial gas space pressure Pг, switching pressure Pmin, and cutoff pressure Pmax of the pump under specific conditions.

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