Maintenance English
Plate Heat Exchanger 11
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Cleaning agents –Incrustation, scaling
Concentration max 4 %
Temperature max 60 °C (140 °F)
Incrustation – Scaling Sediment Cleaning agent
Calcium carbonate Corrosion products Nitric acid
Calcium sulphate Metal oxides Sulfamic acid
Silicates Silt Citric acid
Alumina Phosphoric acid
Diatomic organisms and
their excrement of various
colours
Complexing agents (EDTA, NTA)
Sodium polyphosphates
Cleaning agents – Biological growth, slime
Concentration max 4 %
Temperature max 80 °C (176 °F)
Biological growth – Slime Cleaning agent
Bacteria Sodium hydroxide
Nematodes Sodium carbonate
Protozoa Cleaning effect can be considerably increased by the addition of
small quantities of hypochlorite or agents for the formation of com-
plexes and surfactants.
Cleaning agents – Oil residues, asphalt, fats
Deposit Cleaning agent
Oil residues
Asphalt
Fats
Paraffinic naphta-based solvent (e.g. kerosine).
Note!
Gaskets in EPDM rubber qualities swell in these media. Contact
time should be limited to 30 minutes.
Caution!
The following solutions should not be
used:
• Ketones (e.g. Acetone, Methyletylke-
tone, Methylisobutylketone
• Esters (e.g. Ethylacetate, Butylacetate)
• Halogenated hydrocarbons (e.g.
Chloro-thene, Carbon tetrachloride,
Freons)
• Aromatics (e.g. Benzene, Toluene).
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