FAQ - pressure booster pump

Pressure booster pump is a device that ensures the supply of water to residential buildings from wells, boreholes and retention tanks. The pressure booster pump functions by pressurizing the system with water to the shut-off pressure and shutting it down. When the tap is opened, the water is expelled from the pressure vessel and as soon as the pressure in the system drops below the switching pressure, the pressure booster pump switches on again and pressurizes the entire system to the switching pressure. The pressure booster pump consists of a pressure vessel, a pressure switch and the pump itself. The pump can be either submersible (located in a well, borehole or retention tank) or surface, located directly on the pressure vessel or next to the vessel.

The size of the pressure vessel shall be determined according to the number of sampling points and the number of persons in the household. When choosing a pressure vessel, the following basic facts must be taken into account:

• Physically, there is about 1/3 of water in the pressure vessel, the rest is air (back pressure).
• The number of pump motor switches should not be greater than 20x/hr.

Maximum suction capacity of surface pumps is 9 m. The depth between the pump and the water level is calculated. If the suction depth is greater than 9 m, always use a submersible pump.
Of course, when the suction depth is less than 9 m, you do not always have to use only the surface pressure booster pump. A submersible pump may also be used in this case. Unlike the surface pressure booster pump, thanks to the location of the pump in the well, the absence of noise is a great advantage.

It is recommended to use the water tank with a frequency converter if there is a requirement for constant pressure in the system. It works by setting the desired pressure on the inverter and the inverter further adapts the pump motor speed depending on the current flow. For example, when one tap is opened, the pump will run at only 25%, when the other tap is opened at 50%, and there will always be the same outlet pressure. The advantage of the frequency converter is therefore mainly:

• Constant pressure in the system
• Lower energy consumption
• Integrated dry operation protection
• Minimum space requirements

Nowadays, the myth that the 400V motor has a longer service life than the 230V one practically ceases to apply. In recent decades, 230V motors with their reliability compared to motors at 400V. In some cases, they have surpassed them considerably. Therefore, if you have the option of connecting both 230V and 400V pumps, for simpler connection, it can be recommended rather to 230V.

This is at the discretion of each customer. Just because your well hasn't dried for five years in a row doesn't mean it won't happen for the sixth year. Therefore, level monitoring can always be recommended and should be included in any installation.

Pump manufacturers usually adapt the discharge orifice to the pump flow. Generally speaking, one dimension smaller pipe can still be used (depending on the length). But definitely not to reduce from 5/4“ to 1/2“. 5/4“ displacement indicates a flow of approx. 30 – 60 l/min., which cannot be pushed through a 1/2“ pipe. Never unnecessarily reduce the pipe to a smaller one. You will deprive yourself of the amount of water and most likely destroy the pump's electric motor over time.

It is always the case that the diameter of the suction pipe must not be smaller than the diameter of the suction hole on the pump. If the pipeline is larger, the better.

No water pump may run dry, level monitoring must be used.

Each 3-phase pump must be protected separately according to the motor power.

Energy-efficient pumps operate fully automatically, adapt to the needs of the heating system (reducing or increasing engine speed) and have modern design engines that have up to 70% less consumption than conventional obsolete pumps.