Cooling-water circuits and solar thermal systems are often filled with a water-glycol mixture for frost protection. Propylene glycol also provides a degree of corrosion protection, but it slightly increases fluid viscosity and reduces the system’s ability to separate entrained air.
The circuit was flushed with a pump and a downstream FRIESS magnetic filter. After one hour, the flushing pump was disconnected and the system returned to service.
Despite a total circuit volume of only about 50 litres, the magnetic rods collected a large quantity of fine ferrous particles.
With magnetic filtration installed permanently in the cooling-water and solar circuits, ferrous particles are removed continuously. This prevents deposits, corrosion and pitting on sensitive stainless-steel components such as heat-exchanger plates and thin-walled corrugated hoses. The simple FMF design needs no consumables or filter aids, and annual cleaning during routine maintenance is normally sufficient.
