Product description 2.7 Cooling water
Page 28 Operating instructions for S 40-3...S 150-3 series screw compressors
2.7 Cooling water
Water connection
(for water cooling)
The cooling water must have the following properties:
Cooling water quality
The cooling units are fitted with non-ferrous heat exchangers, as standard. To
avoid damage to these components and to guarantee long term functionality,
ensure that the substances contained in the cooling water used do not exceed
the following values.
Tab. 2.1: Maximum admissible concentration of the substances
Electrical conductivity – > 50 μS/cm at pH-value 7 – 9
Carbonate hardness (CaCO
3
) – < 15° dH
Total hardness – < 21° dH
Cooling water pressure – max. 145 psig
– min. 30 psig
Cooling water inlet temperature – max. +86 °F
– min. + 41 °F
Max. cooling water quantity – see "Technical data".
Substances Symbol max. admissible concentration [mg/l]
Ammonia NH
3
< 2.0
Chloride < 158°F Cl 100
Free chlorine Cl < 0.5
Iron Fe < 0.2
Free agressive carbon dioxide CO
2
< 20
Manganese Mn < 0.1
Nitrate NO
3
< 100
Oxygen O
2
< 2
Silicon oxide SiO
2
< 8
Sulphate SO
4
< 60
Total dissolved substances TDS < 30
NOTICE!
If the specified limit values are exceeded, use cooling units made of other
materials.
Please consult BOGE's service department.
WARNING!
If the cooling water data changes, the cooling units may have to be reconfig-
ured. Incorrectly configured cooling units may cause malfunctions and cause
the compressor to switch off!
Please consult BOGE.
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