With the widespread installation of CHP units today, especially with district heating operators, it makes sense to install appropriate storage units.

The content volume of the installed storage tanks represents a large proportion of the content volume of the district heating networks operated. The tanks are often made of “black” steel and have no coating or rubber coating.

When commissioning district heating storage tanks, care must be taken to ensure appropriate conditioning and treatment of the water contained in the tanks. Furthermore, depending on the level of soiling (iron oxides, rust, oils, grease, welding residues), the storage tanks should be flushed before filling or commissioning, as these impurities will otherwise enter the district heating network directly.

The same guidelines apply to the content water of district heating storage tanks as for the treatment of district heating networks and hot water generators, as the storage tanks are directly connected to the systems. 

In order to protect the district heating network and the existing hot water generators from corrosion and deposits, the water in the storage tanks must be treated beforehand in accordance with the applicable guidelines (DIN EN 12953-10, AGFW worksheet FW 510, etc.). In particular, it is essential to use treated  water (softened or partially demineralized) when filling the storage tank. Sufficient alkalization and any necessary oxygen binding must also be ensured. 

Salt-free products such as FINEAMIN, which have an oxygen-binding effect in addition to alkalizing and forming a protective film, are ideal for this purpose. FINEAMIN can be added while the storage tanks are being filled.