Table of Contents
Advertisement
Preparations for use
4.5 Coolant specification
Biocides
Closed cooling circuits with soft water (°dH > 4) are susceptible to microbes. The risk of
corrosion caused by microbes is virtually non-existent in chlorinated drinking water systems.
No strain of bacteria can survive when the appropriate quantity of anti-freeze is added. The
following microbes can occur:
● Bacteria that cause the formation of slime
● Corrosive bacteria
● Bacteria that cause deposits of iron
The type of bacteria determines the suitability of a biocide. At least one water analysis per
annum (to determine the number of bacterial colonies) is recommended. You can purchase
suitable biocides, for example from Nalco.
Note
Determining the appropriate biocide
The type of bacteria determines the biocide. Antifreeze already has a biocidal effect for the
minimum concentration specified above.
● The manufacturer's recommendations must be followed in regard to the dosage and
● Never mix biocides and anti-freeze.
4.5.4
Cooling capacity derating
If you use antifreeze, then observe the cooling capacity derating factor, dependent on the
antifreeze concentration, as listed in the table.
Anti-freeze
Antifrogen N
Varidos FSK
Antifrogen L
Antifrogen N / Varidos FSK ≙ ethylene glycol
Antifrogen L ≙ propylene glycol
Note
Order-specific agreements
Order-specific agreements regarding the cooling water specification can deviate from the
cooling water specification mentioned.
40
compatibility with any inhibitor that might be used.
Concentration
20%
25%
30%
35%
40%
45%
Cooling capacity derating factor
0%
0%
0%
2%
4%
5%
SIMOTICS FD 1MH1
Operating Instructions 08/2017
Advertisement
Table of Contents
