Total Dissolved Solids
The most important indication in boiler water that has to be understood is TDS, Total Dissolved Solids. Total dissolved solids (TDS) is a measure of the combined content of all inorganic and organic substances contained in a liquid in the fresh water system. TDS is a reading used to measure the amount of inorganic salts dissolved in water that hydrolyzed into ions. Result of TDS is often used to determine the frequency of the blow down of the boiler.
The required test results for the analysis includes boiler feed water, boiler water and the condensate.
For steam boiler up to 20 barg of saturated steam.
The maximum allowable value for TDS in boiler water should be maintained below 2500 mg/l
The maximum allowable in boiler feed water for Total Hardness (TH) should not exceed 1 mg/l.
*Ref = Reference with
TH should be monitored continuously and the actual reading of the result to be trended in real time.
High TDS results to scaling and increases the viscosity of boiler water which causes carry-over of solids with the steam, resulting to the reduction in the quality of steam and leading to potential damage of the boiler equipment and system.
Impurities in boiler feed water and resulting impacts checklist
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