Power source for supplying water-based liquid to system, and fire extinguishing arrangement

Abstract

The invention relates to a power source for supplying water-based liquid to a system, the power source comprising a container (,) for the water-based liquid and a pump unit (,) which comprises a pump (,) and a power source (,) for the pump, the pump unit being arranged to supply the water-based liquid from the container to the system via a pipe system (,) which is filled with a liquid. To enable economical supply of water-based liquid to a system without the risk of the liquid freezing, the pipe system (,) is filled with antifreeze and the power source comprises an additional container (,) which is filled with antifreeze and an additional pump unit (,) with a pump (,) and a power unit (,) for the pump, the additional pump unit being arranged to maintain a stand-by pressure in the pipe system via a pipeline (,) and to supply for this purpose antifreeze from the additional container to the pipe system (,) if the pressure in the pipeline drops below the stand-by pressure, whereby the pump unit (,) for pumping water-based liquid is arranged to feed water-based liquid which has a tendency to freeze into and out of the pipe system in liquid phase if the pressure in the pipe system drops below a certain level.