To ensure the best possible protection, when purchasing a new storage tank, we recommend checking the condition of the anode after one year and replacing it after two years at the latest. After that, the anode replacement can be adjusted depending on the condition of the protective anode. Furthermore, it is essential to follow the manufacturer's maintenance instructions.
The enamel quality of the accumulators and the size of the sacrificial anode are specified in DIN 4753 and adjusted to achieve a minimum anode service life of 2 years.
According to DIN EN 806 ff, an annual inspection of the anode must be carried out. Depending on the water quality and the condition of the storage tank, the wear of the protective anode varies considerably.
Corrosion phenomena cannot be reversed and corresponding local damage cannot be reversed by later use of a cathodic corrosion protection system. Therefore, the magnesium anode must be checked annually during every maintenance and, if necessary, replaced with a new magnesium anode.
How long a sacrificial anode lasts therefore depends on many different factors.
There are several ways to determine when a sacrificial anode is spent.
1. visual inspection
During a visual inspection, the sacrificial anode is removed according to the manufacturer's instructions. If the diameter of the sacrificial anode is worn down to 15-10 mm, we recommend replacing the protective anode. Furthermore, an anode should be exchanged which is clogged with very heavy deposits and thus can only deliver little protective current.
2. current measurement
In contrast to a visual inspection, a protective anode with insulated installation (earth cable) does not require the system to be shut down or the sacrificial anode to be removed. You can measure the protective current still present with the aid of an anode tester or resistance meter.
- Current measurement > 0.3 mA - anode is functional
- Current measurement < 0.3 mA - Remove the anode and continue with the visual inspection.
Note : Please refer to the operating instructions of your test instrument. Furthermore, a protective current measurement is only possible with a water-filled storage tank.
3. signal anode
The simplest way to determine the consumption of a sacrificial anode is to use the signal anode. The red colouring of the signal transmitter shows you exactly when the anode is used up.
As a magnesium anode manufacturer, we offer the following types of sacrificial anodes :
- Rod an odes / Chain an odes / Signal anodes.
Our sacrificial anodes are available in all common lengths, the diameters are as follows:
- Ø 22 mm / Ø 26 mm / Ø 33mm.
We also offer the following screw-in types:
M8 / G 3/4" / G 1" / G 1 1/4 " / G 1 1/2 "
Our magnesium anodes are manufactured from extruded magnesium according to DIN EN 12438 and are subject to constant quality control.
Advantages of our extruded magnesium anodes compared to commercial cast anodes:
- Moderate consumption of the protective anode, thus longer durability
- No shrinkage as with cast anodes (hollow space)
- Higher magnesium content, approx. 95% compared to approx. 90% for standard cast anodes.