Dear friend Shrutt
1.Let a natural circulation boiler having Steam Pressure of 40 Kg/Cm2, hardness of turbine condensate must not be over 10 microgram-equivalent/kg.
2. When steam pressure is in between 40 Kg/Cm2 to 100 kg/cm2 hardness of turbine condensate should be restricted to 5 microgram-equivalent/Kg
3. When it is greater than above two cases hardness must not exceed 1 microgram-equivqalent/Kg
4. for once through system it is restricted to 0.5 microgram-equivalent/Kg
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