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Giel van der Hoeven
Service & Maintenance Coordinator | July 9, 2021 | 2 min. reading time

Magnetite is thus created in an environment with little oxygen. Upon the entering of oxygen, for example as a consequence of leakages, supplementation or condensing taps, this magnetite formation will however continue. In this case it is important to realize: the lower the temperature of the water, the more oxygen will be drawn in and can dissolve in it. The meanwhile formed protecting magnetite layer becomes unstable because of this and is released from the piping, Now a process starts during which magnetite is formed and released repeatedly. As a consequence, more magnetite ends up in the system water. These magnetite particles are razor sharp, polluting and strongly magnetic. ‘Dead’ water (means: black water) is therefore not dead at all!

Magnetite removal is highly important. Magnetite causes all kinds of negative consequences:

• Erosion corrosion of piping and components (braking of, for example, pump impellers)
• Stuck valves as a result of which the installation can no longer be controlled
• Sludge formation in combination with lime and bacterial growth
• Yield losses
  

Magnetite formation can be created/removed by means of proper degassing and magnet filtration. This magnet filtration takes place in the partial flow filters, that are incorporated in the piping. On the inside of the partial flow filter, one or more agents are present. The filter bag captures the coarse parts from the system water and the magnets capture the small parts. Polluted filter bags must be replaced, while the magnets should be thoroughly rinsed if they are strongly polluted.

Before opening the partial flow filter, seal the feed line and drain and open the filter at the large lid on top of the partial flow filter. After the filter and the magnets have been cleaned, everything should be closed again. After properly closing the lid, carefully open the feed line again and vent the partial flow filter using the air vent in the lid. If the partial flow filter has been vented, also the drain line can be opened again.

Cleaning the partial flow filter is not the only maintenance that a heating system requires regularly. Click here for more tips about maintenance on the heating system.

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