Reference
Description
26
Torques for steel (Fe) or brass (CuZn) bolts
27
Consult the Instruction book before greasing
4.9
Cooling water requirements
Recommendations
The water circuit must be completely filled up with water at any time. Also when the unit is not
running.
The cooling water quality must meet certain minimum requirements.
No general recommendation can encompass the effects of all combinations of the various
compounds, solids and gases typically found in cooling water in interaction with different
materials.
Only non-treated water must be used.
This recommendation is a general guideline for acceptable coolant quality.
Type of system
First, it is important to consider whether you are dealing with a closed system or an open system.
In a closed system, the same cooling water circulates through a system without contact with air.
An open system is a pass-through system, or a circulating system with a cooling tower. In the
latter case, the composition of the water that enters the cooler must be considered, and not the
composition of the make-up water. Due to the evaporative effect in the cooling tower, much
higher concentrations of ions can be obtained in the circulating water than in the make-up water.
Ryznar stability index (RSI)
The Ryznar Stability Index (RSI) is a parameter for predicting whether water will tend to dissolve
or precipitate calcium carbonate. The adhesion of scaling deposits and their effect are different
on different materials, but the equilibrium of the water (scaling or corrosive) is only determined by
its actual pH value and by the saturation pH value (pH
s
).
The saturation pH value is determined by the relationship between the calcium hardness, the
total alkalinity, the total solids concentration and the temperature.
The Ryznar Index is calculated as follows :
RSI = 2*pH
s
- pH
Symbol
Explanation
pH
Measured pH (at room temperature) of water sample
pH
s
pH at saturation
The pH
s
is calculated by using :
pH
s
= (9.3 + A + B) - (C + D)
Instruction book
52
APF219617
Summary of Contents for MAS 200
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