Pst Technology

Model CLAN series - Automatic Pressure Systems



The automatic pressure systems series “CLAN” have been designed f or keeping a constant water pressure on small or medium domestic, industrial or irrigation plants. These pressure systems are supplied already assembled and ready for installation. It is possible to choose the most suitable solution for the plant’s necessities through the selection of the electrical pump based on the capacity and the working curve. It is also possible to choose the pressure system for its own characteristics. It is important to remind that the size of the pressure system is determined by the quantity of water and pressure required.


Residential buildings

The main data needed for calculation of the water needs are given as f ollowing:

  • the typology of distribution (tab. 1)
  • consumption per numbers of outlet (tab.2)
  • the simultaneity factor

The maximum theoretical requirement is given by the sum of the quantities of water delivered to the various typologies of distribution and flats multiplied by the number of them. In practice, it is generally found that only some of the outlets are used simultaneously. The simultaneity factor allows to define the real maximum delivery that may be required by the typology of distribution.

Non-residential buildings.

For calculation of quantities of water required the following types of buildings are considered:

  • offices
  • shopping centres
  • hospitals
  • hotels

Choosing a pressure system per delivery head / pressure

The outlet pressure required for proper operation o f electrical appliances & sprinklers must not be lower than 1,5 bar and usually not greater then 4-5 bar. The values to consider for pressure level calculation are the following:

  • the geodetic head between the pressure boosting unit and the highest outlet
  • the suction lift
  • the initial pressure (or positive suction head)
  • the minimum residual pressure at the highest outlet (normally 1.5 bar)
  • the system head loss
  • the difference in pressure between starting and stopping pump

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