RSI Chloride
limit
Water condition Maximum 65°C /
149°F
Maximum 95°C / 203
°F
4.0<RSI<5.5 200 ppm High scale formation Regular control and
descaling operation
necessary.
Not recommended for
plate heat exchangers
Not applicable.
5.6<RSI<6.2 350 ppm Slight scale formation Water treatment not
necessary.
Occasional inspection
recommended.
Not applicable.
6.3<RSI<6.8 500 ppm Neutral water Water treatment not
necessary.
Occasional inspection
recommended.
Water treatment not
necessary.
Occasional inspection
recommended.
6.9<RSI<7.5 350 ppm Slight corrosion Water treatment not
necessary.
Occasional inspection
recommended.
Water treatment not
necessary.
Occasional inspection
recommended.
7.6<RSI<9.0 200 ppm Strong corrosion Regular control
necessary.
Avoid interruption of
operation
Regular control
necessary.
Avoid interruption of
operation
9.1<RSI<11 200 ppm Very strong corrosion Regular control
necessary.
Avoid interruption of
operation
Regular control
necessary.
Avoid interruption of
operation
RSI>11 200 ppm Very strong corrosion Regular control
necessary.
Avoid interruption of
operation
Regular control
necessary.
Avoid interruption of
operation
Recirculating system, with cooling tower
RSI Chloride
limit
Water condition Maximum 65°C / 149°F
RSI<3.9 200 ppm Very high scale formation Water cannot be used.
4.0<RSI<5.5 200 ppm High scale formation Regular control and descaling
operation necessary.
Not recommended for plate
heat exchangers
5.6<RSI<6.2 350 ppm Slight scale formation Water treatment not
necessary.
Occasional inspection
recommended.
6.3<RSI<6.8 500 ppm Neutral water Water treatment not
necessary.
Occasional inspection
recommended.
Instruction book
74 9829 3178 63
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